Architect Foundations
Auto-activated knowledge layer. Every response involving building architecture draws from this reference base before routing to specialized skills.
1. Core Architects & Theorists Quick Reference
| # | Architect / Theorist | Core Framework (Dates) | Key Concepts & Exemplar Buildings | When to Apply |
|---|---|---|---|---|
| 1 | Vitruvius | *De Architectura* (c. 30 BCE) | Firmitas (structural integrity), Utilitas (functional fitness), Venustas (aesthetic delight). Classical orders (Doric, Ionic, Corinthian) as proportional systems. Site orientation per wind/sun. Aqueduct and basilica typology. *Exemplar:* Basilica at Fano (described, not extant). | Foundational quality check on any project. Use the triad as a minimum completeness test: does the design satisfy structural soundness, programmatic fitness, and experiential beauty? |
| 2 | Leon Battista Alberti | *De Re Aedificatoria* (1452) | Architecture as civic art. Concinnitas (harmony of parts). Facade as independent compositional layer (Palazzo Rucellai, Florence, 1446-1451 -- pilaster orders applied to masonry wall). Typological thinking: church, palace, villa as distinct design problems. Town planning principles. | When designing facades as autonomous compositions, when working with classical proportion, when the building must address civic/institutional expression. |
| 3 | Andrea Palladio | *I Quattro Libri dell'Architettura* (1570) | Proportional room ratios (1:1, 1:sqrt2, 1:2, 2:3, 3:4). Bilateral symmetry along central axis. Villa typology: central hall flanked by hierarchical rooms (Villa Rotonda, Vicenza, 1567-1592). Loggia/portico as threshold. Temple front applied to domestic architecture. Harmonic proportions derived from musical intervals. | Residential design requiring formal order. Any project where room-to-room proportional relationships matter. Classical institutional buildings. Heritage/conservation contexts requiring Palladian literacy. |
| 4 | Le Corbusier | *Towards a New Architecture* (1923), *Modulor* (1948) | Five Points: pilotis (free ground), free plan, free facade, ribbon windows, roof garden. Dom-ino frame (1914): slab-column independence enabling plan freedom. Modulor: anthropometric proportional system (red/blue series from 1.83m standing figure). *Promenade architecturale* (Villa Savoye, Poissy, 1929-1931). Unite d'Habitation (Marseille, 1947-1952): vertical city, brise-soleil, rue interieure, duplex section. Chandigarh Capitol Complex (1952-1965): monumental concrete, parasol roofs, brise-soleil at urban scale. | Reinforced concrete frame buildings. When separating structure from enclosure. Multi-storey housing with communal services. Sun-control facade design. Proportional system for furniture-to-building scale coherence. |
| 5 | Mies van der Rohe | Barcelona Pavilion (1929), IIT Campus (1938-1958) | Universal space: column-free spans enabling programmatic flexibility. "Less is more." Steel-and-glass construction as tectonic expression. Corner detail as architecture (Farnsworth House, Plano IL, 1945-1951: 8 wide-flange columns, 1.5m cantilever, elevated floor plane). Seagram Building (NYC, 1954-1958): bronze I-beam mullions, set-back plaza, 8.4m structural bay. Crown Hall (IIT, 1950-1956): 36.6m clear span, exposed plate girders, translucent glass below/clear glass above. | Large-span structures. Corporate/institutional buildings seeking material honesty. When structural expression IS the architecture. Office buildings, museums, galleries requiring flexible open plans. |
| 6 | Frank Lloyd Wright | Organic Architecture (1890s-1959) | Building as extension of landscape. Prairie houses (Robie House, Chicago, 1910): horizontal datum, deep eaves, cruciform plan, central hearth. Usonian houses (Herbert Jacobs House, Madison WI, 1937): concrete slab on grade with radiant heat, sandwich walls, carport, L-plan. Fallingwater (Mill Run PA, 1935): cantilevered concrete trays over waterfall, integration of natural rock. Guggenheim Museum (NYC, 1943-1959): continuous spiral ramp, top-lit atrium. | Residential design with strong site integration. When topography drives form. When interior spatial flow takes priority over discrete rooms. Radiant floor heating. Open-plan living. |
| 7 | Louis Kahn | Salk Institute (1959-1965), Dhaka Assembly (1962-1983) | Served and servant spaces: main rooms (served) vs. mechanical/circulation zones (servant). Distinction between "what a building wants to be" and program. Silence and Light as design metaphor. Monumental concrete with deliberate formwork. Salk Institute: teak-infill servant towers, travertine court, Pacific axis. Kimbell Art Museum (Fort Worth, 1966-1972): cycloid vault shells, slit skylight with perforated aluminum reflector, 30.5m span, natural light in galleries. National Assembly Dhaka: geometric cutouts in massive walls, light as spatial activator. | Museums and cultural buildings where natural light is paramount. Institutional buildings requiring clear spatial hierarchy. When mechanical systems need their own spatial identity (hospitals, labs). Projects demanding material gravitas. |
| 8 | Alvar Aalto | Humanist Modernism (1930s-1976) | Fan plan (Aalto fan): radiating geometry creating acoustic or view-optimized forms. Material warmth: brick, timber, copper against white render. Viipuri Library (1927-1935): conical skylights, undulating ceiling in lecture hall. Paimio Sanatorium (1929-1933): patient room design driven by recumbent body (ceiling colour, angled washbasin, radiant heating, view orientation). Saynatsalo Town Hall (1949-1952): raised courtyard, brick mass, intimate civic scale. Baker House MIT (1947-1949): serpentine plan giving each room a river view. | Healthcare, educational, and civic buildings. When user comfort drives geometry. Acoustic design of auditoria. Northern/cold climates where material warmth matters. When irregular geometry serves functional purpose (views, acoustics) rather than formal expression. |
| 9 | Tadao Ando | Church of the Light (1989), Naoshima projects (1988-2004) | Smooth-cast in-situ concrete with 900mm tie-hole grid as ornament. Light as primary material. Geometric purity: circles, rectangles, intersecting walls. Church of the Light (Osaka): cruciform slot in end wall, no glass originally. Water Temple (Awaji, 1991): descent through lotus pond into underground elliptical space. Chichu Art Museum (Naoshima, 2004): entirely below grade, skylit galleries, no external presence. | Gallery/museum spaces. Meditation/religious buildings. When concrete is the primary expressive material. Sites where building must defer to landscape. Projects requiring extreme precision in light control. |
| 10 | Peter Zumthor | *Atmospheres* (2006), *Thinking Architecture* (1998) | Material presence: every material selection tested at full scale. Thermal qualities of space (temperature of a room as design parameter). Temporal craft: aging, weathering, patina as design intent. Therme Vals (1996): local Valser quartzite, 15cm layered slabs, slot skylights, water as spatial medium. Bruder Klaus Chapel (Kolumba, 2007): rammed concrete over timber wigwam formwork, charred interior, oculus. Kolumba Museum (Cologne, 2007): perforated brick screen over Gothic ruin, filtered light. | Museums, baths, sacred spaces. When material sourcing is site-specific. When atmosphere and sensory experience outrank visual spectacle. Renovation/adaptive reuse requiring archaeological sensitivity. Projects where slow construction craft is viable. |
| 11 | Glenn Murcutt | "Touch the earth lightly" (1969-present) | Climate-responsive sectional design for Australian conditions. Corrugated metal, steel frame, raised floor. Sectional thinking: ventilation stack, reflective underside, operable louvers. Marika-Alderton House (Yirrkala NT, 1991-1994): timber frame, plywood panels operable as walls/shutters, cross-ventilation for tropical monsoon climate. Simpson-Lee House (Mt Wilson NSW, 1988-1994): steel pavilion, bushfire-resistant, rainwater collection, north-facing (southern hemisphere). Single architect, hand-drawn, no employees. | Hot-arid and hot-humid climates. Lightweight steel/timber construction. Passive ventilation. Bushfire-prone sites. Rural and remote sites. When section design drives environmental performance more than plan. |
| 12 | Rem Koolhaas / OMA | *Delirious New York* (1978), *S,M,L,XL* (1995) | Bigness: beyond a certain scale, buildings can no longer be controlled by a single architectural gesture. Programmatic layering: stacking unrelated programs vertically (Seattle Central Library, 2004: 5 programmatic platforms with interstitial "in-between" floors). Generic City / Junkspace as critique. CCTV Building (Beijing, 2002-2012): continuous loop structure, 234m tall, 473,000 sqm, cantilevered 75m overhang. De Rotterdam (2013): vertical city, three interconnected towers, mixed-use stacking. | Large-scale mixed-use complexes. Urban masterplanning at metropolitan scale. When program exceeds simple typological classification. Competition projects requiring narrative. Projects where diagram precedes form. |
| 13 | Renzo Piano / RPBW | Centre Pompidou (1971-1977, with Rogers), Lightness + Craft | Layered facades with environmental/structural logic. Lightness through refined steel/glass/terracotta detailing. Centre Pompidou: inside-out services, gerberette brackets, polychrome ducts. Menil Collection (Houston, 1982-1987): ferro-cement "leaf" baffles for diffused daylight. The Shard (London, 2009-2012): 309.6m, tapering glass planes, open apex. California Academy of Sciences (SF, 2000-2008): living roof, 2.5-acre canopy, net-zero energy target. Jean-Marie Tjibaou Cultural Centre (Noumea, 1991-1998): iroko timber "cases" inspired by Kanak huts, passive stack ventilation. | Museum/gallery daylighting. Tall buildings requiring environmental performance. Cultural buildings in sensitive contexts. When the facade is the primary design problem. High-craft construction with large budgets. |
| 14 | Kengo Kuma | *Anti-Object* (2008), Material Dissolution | Material dissolution: breaking mass into particles (wood slats, stone chips, aluminum louvers). Transparency through layering. Yusuhara Wooden Bridge Museum (2010): cantilevered laminated timber. V&A Dundee (2018): precast concrete fins creating cliff-like facade. Starbucks Reserve Roastery Tokyo (2019): 2000 Yoshino cedar tubes. GC Prostho Museum (2010): cidori timber joint system, no nails. Japan National Stadium (2019): timber-and-steel hybrid lattice, 5 stories of overhanging eaves, natural ventilation ring. | Timber and natural material construction. When mass needs to be dematerialized. Japanese-influenced detailing. Pavilion and museum projects. Screen/filter facade strategies. |
| 15 | Bjarke Ingels / BIG | *Yes is More* (2009), Hedonistic Sustainability | Worldcraft: architecture as world-building. Programmatic diagrams as generative form (8 House, Copenhagen, 2010: figure-eight loop, 476 units, ground-to-penthouse cycling path). CopenHill (2019): waste-to-energy plant with ski slope/climbing wall on facade. VIA 57 West (NYC, 2016): courtyard + skyscraper hybrid, tetrahedral form. The Spiral (NYC, 2025): cascading terraces. Sustainability as hedonism: green features that are also pleasurable. | Mixed-use housing at urban scale. Public infrastructure requiring public amenity. Competition design with strong narrative/diagram. Projects where sustainability must be experiential, not just metric-driven. |
| 16 | Francis Kere | Community-Built Architecture, Pritzker 2022 | Local materials + community labor as design strategy. Primary School Gando (Burkina Faso, 2001): compressed laterite blocks, rebar-reinforced, raised roof for stack ventilation, 30cm gap between ceiling and corrugated roof. Lycee Schorge (Koudougou, 2016): eucalyptus lattice screens. Serpentine Pavilion (2017): indigo timber canopy. National Assembly of Burkina Faso (Ouagadougou, 2025): stepped pyramid, tree-shaded gathering, local stone. Tropical ventilation through double roofs and thermal chimneys. | Low-resource contexts. Hot-dry/hot-humid tropical climates. Community-participatory design processes. When local material sourcing is a design imperative. Educational buildings in developing regions. Stack ventilation strategies. |
| 17 | Lacaton & Vassal | Pritzker 2021, "Never Demolish" | Economy of means: maximum space per euro. Greenhouse/polycarbonate technology as inhabited space. Transformation of Bois-le-Pretre Tower (Paris, 2005-2011, with Druot): wrap-around winter gardens added to existing social housing, no tenant displacement. Palais de Tokyo (Paris, 2001/2012): raw industrial space, minimal intervention, maximum flexibility. FRAC Dunkirk (2013): double building -- exhibition box + translucent twin using greenhouse structure at 1/10 the cost. Generous space > expensive finishes. | Social housing renovation/extension. Tight budgets requiring spatial generosity. When existing structures must be retained. Climate-buffer (winter garden) strategies. Adaptive reuse. Projects where cost/sqm is the critical constraint. |
| 18 | Carlo Scarpa | Castelvecchio Museum (1956-1973), Detail as Architecture | Joint as architecture: every connection between materials is a design opportunity. Layered reveals, shadow gaps, material juxtapositions. Castelvecchio (Verona): Cangrande statue pivot, steel-concrete-stone layered thresholds, water channels. Brion Cemetery (San Vito d'Altivole, 1968-1978): interlocking concrete geometry, ziggurat chapel, water-filled reflecting basin. Olivetti Showroom (Venice, 1957-1958): Aurisina marble, teak, brass, mosaic -- each material precisely bounded. Fondazione Querini Stampalia (Venice, 1961-1963): controlled flooding detail, brass/stone/water thresholds. | Heritage renovation and museum design. When material junctions are the primary design expression. High-craft detailing with multiple material interfaces. Waterside/flood-prone sites. Projects with archaeological layering. |
| 19 | Robert Venturi | *Complexity and Contradiction in Architecture* (1966), *Learning from Las Vegas* (1972) | Decorated Shed vs Duck: buildings that apply ornament to conventional form vs. buildings where form IS the symbol. "Less is a bore." Vanna Venturi House (Philadelphia, 1962-1964): split gable, oversized chimney void, compressed entry. Guild House (1960-1963): brick, applied ornament (gold TV antenna), contextual scale. Complexity and contradiction: both/and instead of either/or. Mannerism as valid design strategy. | When a building must communicate symbolically in a commercial/suburban context. When pure abstraction fails to engage users. Contextual infill in existing neighborhoods. Critique and alternative to minimalist dogma. |
| 20 | Aldo Rossi | *The Architecture of the City* (1966), *A Scientific Autobiography* (1981) | Urban artifacts: buildings as permanent elements giving identity to cities. Typology as collective memory (courtyard, tower, colonnade as archetypes). Analogical city: design through recombination of remembered forms. San Cataldo Cemetery (Modena, 1971-1984): cubic ossuary, colonnaded streets of the dead, exposed steel frame as ruin. Teatro del Mondo (Venice, 1979): floating timber theater, temporary monument. Bonnefanten Museum (Maastricht, 1990-1995): brick, zinc cupola, axial stair. | Urban design where collective typological memory matters. Cemetery/memorial design. When the city's existing morphology should generate the building's form. Competition narratives grounded in urban history. Housing blocks that must contribute to urban identity. |
Additional Theorists for Reference
| Theorist | Key Contribution | Essential Text |
|---|---|---|
| Christopher Alexander | Pattern Language (253 patterns from region to construction detail), Nature of Order, living structure | *A Pattern Language* (1977), *The Timeless Way of Building* (1979) |
| Jan Gehl | Human-scale urban design, 12 quality criteria for public space, edge effect, life between buildings | *Life Between Buildings* (1971), *Cities for People* (2010) |
| Kevin Lynch | Urban imageability: paths, edges, districts, nodes, landmarks | *The Image of the City* (1960) |
| Herman Hertzberger | Structuralism, polyvalent form, threshold as social space | *Lessons for Students in Architecture* (1991) |
| Fumihiko Maki | Group Form, compositional/megastructure/group form typology, collective form | *Investigations in Collective Form* (1964) |
| Christian Norberg-Schulz | Genius loci, existential space, phenomenology of architecture | *Genius Loci* (1979) |
| Kenneth Frampton | Critical Regionalism, tectonic culture, resisting universal commodification | *Modern Architecture: A Critical History* (1980), *Studies in Tectonic Culture* (1995) |
| Reyner Banham | Environmental controls as architecture, well-tempered environment | *The Architecture of the Well-Tempered Environment* (1969) |
| Bernard Tschumi | Event-space, disjunction, program as generator (Parc de la Villette, 1982-1998) | *Architecture and Disjunction* (1994) |
| Balkrishna Doshi | Indian modernism, low-cost housing (Aranya, Indore, 1989), stepped form, courtyards | Pritzker 2018, Sangath Studio (1980) |
| Anne Lacaton | See Lacaton & Vassal above; economy, generosity, never demolish | *Freedom of Use* (2015) |
| Alejandro Aravena / ELEMENTAL | Half-a-house incremental housing (Quinta Monroy, Iquique, 2004), participatory design | Pritzker 2016 |
| Lina Bo Bardi | MASP Sao Paulo (1968): 74m clear span, civic void below. Glass House (1951). Social architecture. | Post-colonial modernism, cultural buildings as public gathering |
| Jorn Utzon | Additive architecture, platform and plateau, Sydney Opera House (1957-1973): spherical geometry shells | *Platforms and Plateaus* (1962) |
| Cedric Price | Fun Palace (1961, unbuilt): flexible, demountable, serviced framework. Anticipatory architecture. | Architecture as enabling infrastructure, not monument |
2. Quantitative Rules of Thumb
2.1 Floor-to-Floor Heights
| Building Type | Minimum | Optimal | Maximum | Clear Ceiling | Source |
|---|---|---|---|---|---|
| Single-family residential | 2.6 m | 2.8 m | 3.2 m | 2.4 m min | IRC R305.1 |
| Multi-family residential | 2.8 m | 3.0 m | 3.4 m | 2.4 m min | IBC 1208.2 |
| Office (standard) | 3.6 m | 3.9 m | 4.2 m | 2.7 m typ | ASHRAE + AGS |
| Office (premium Grade A) | 3.9 m | 4.2 m | 4.5 m | 2.85 m typ | BCO Guide 2019 |
| Retail (ground floor) | 4.5 m | 5.0 m | 6.0 m | 3.5 m min | IBC + Neufert |
| Retail (upper floors) | 3.6 m | 4.2 m | 5.0 m | 3.0 m min | Neufert |
| Hotel guest room | 2.8 m | 3.2 m | 3.6 m | 2.55 m min | Brand standards vary |
| Hospital (patient floor) | 4.2 m | 4.5 m | 4.8 m | 2.7 m clear | FGI Guidelines 2022 |
| Hospital (surgical) | 4.5 m | 4.8 m | 5.4 m | 3.0 m clear | FGI Guidelines 2022 |
| School (classroom) | 3.3 m | 3.6 m | 4.0 m | 2.7 m min | BB103 / Neufert |
| Laboratory | 4.2 m | 4.5 m | 5.0 m | 3.0 m min | NIH Design Req |
| Parking (above-grade) | 3.0 m | 3.3 m | 3.6 m | 2.3 m clear | IBC 406.4 |
| Parking (below-grade) | 2.8 m | 3.0 m | 3.3 m | 2.1 m clear min | IBC 406.4 |
| Industrial / warehouse | 6.0 m | 8.0 m | 12.0 m | 5.0 m+ clear | Varies by rack ht |
| Data center | 4.0 m | 4.5 m | 5.5 m | 3.0 m raised floor | Uptime Institute |
| Auditorium / theater | 6.0 m | 8.0 m | 15.0 m+ | Fly tower: 2.5x proscenium ht | Neufert / AGS |
2.2 Structural Grid Spacing
| Building Type | Typical Bay (m) | Common Grid | Notes | Source |
|---|---|---|---|---|
| Residential (RC frame) | 5.0 - 8.0 m | 5.4 x 8.1 m, 6.0 x 7.5 m | Bays accommodate 2 parking below | Neufert |
| Residential (load-bearing) | 3.6 - 6.0 m | Party wall @ 5.4-6.0 m | Limited by precast plank span | EN 1992 |
| Office (steel frame) | 7.5 - 12.0 m | 9.0 x 9.0 m, 7.5 x 12.0 m | 9m allows 2x open-plan + corridor | BCO Guide |
| Office (RC flat slab) | 7.5 - 10.5 m | 7.5 x 7.5 m, 9.0 x 9.0 m | Post-tensioned extends to 12m | ACI 318 |
| Parking structure | 8.1 x 5.4 m | 16.2 x 5.4 m double bay | 5.4m = 2 stalls + aisle; 8.1m = 3 stalls | IBC / NPA |
| Warehouse / logistics | 12.0 - 24.0 m | 12 x 24 m, 24 x 24 m | Clear height driven by racking | AISC / Neufert |
| Hospital | 7.2 - 8.4 m | 7.2 x 7.2 m, 8.4 x 8.4 m | Must accommodate patient rooms (3.6m module) | FGI / HBN |
| School | 7.2 - 8.4 m | 7.2 x 8.4 m | Classroom = 1 or 2 structural bays | BB103 |
| Sports hall | 18.0 - 40.0 m+ | Long-span systems | Glulam, steel truss, space frame | Neufert |
2.3 Core, Circulation & Daylighting Distances
| Metric | Value | Notes | Source |
|---|---|---|---|
| Maximum core-to-facade distance (daylighting) | 15.0 m | 2.5x window head height rule of thumb | CIBSE LG10 |
| Optimal core-to-facade distance | 12.0 m | Ensures DF > 2% at deepest point | EN 17037 |
| Maximum plan depth, naturally ventilated | 12-15 m | 5x floor-to-ceiling height | CIBSE AM10 |
| Maximum plan depth, cross-ventilated | 5x ceiling ht per side | e.g., 2.7m ceil = 13.5m total | CIBSE AM10 |
| Maximum single-sided ventilation depth | 2-2.5x ceiling ht | e.g., 2.7m ceil = 5.4-6.75m | CIBSE AM10 |
| Maximum dead-end corridor length | 6.0 m (unsprinklered) | 15.0 m sprinklered (IBC varies by occupancy) | IBC 1020.4, NFPA 101 |
| Maximum travel distance to exit (office, sprinklered) | 76.2 m (250 ft) | Unsprinklered: 61.0 m (200 ft) | IBC Table 1017.2 |
| Maximum travel distance to exit (residential, sprinklered) | 76.2 m (250 ft) | Unsprinklered: 61.0 m (200 ft) | IBC Table 1017.2 |
| Maximum common path of travel (sprinklered) | 22.9 m (75 ft) | Business/residential occupancy | IBC 1006.2.1 |
2.4 Net-to-Gross Area Ratios
| Building Type | Net/Gross Ratio | Circulation + Core | Walls + Structure | Source |
|---|---|---|---|---|
| Residential (apartment) | 75-85% | 12-18% | 5-8% | Neufert / RICS |
| Office (speculative) | 70-80% | 15-22% | 5-8% | BCO Guide 2019 |
| Office (owner-occupied) | 75-82% | 13-18% | 5-8% | BCO Guide 2019 |
| Retail (shopping centre) | 65-75% | 20-28% | 5-8% | RICS |
| Hotel | 60-70% | 25-32% | 5-8% | HVS / Neufert |
| Hospital | 55-65% | 28-35% | 7-10% | FGI / HBN |
| School (primary) | 60-70% | 22-30% | 5-8% | BB103 |
| School (secondary) | 55-65% | 25-35% | 5-8% | BB103 |
| University | 55-65% | 25-35% | 5-8% | AUDE / HEFCE |
| Laboratory | 50-60% | 30-40% | 5-10% | NIH / S-Lab |
| Museum / gallery | 55-65% | 25-35% | 5-10% | AGS |
| Parking structure | 85-90% | 8-12% | 2-5% | NPA |
| Data center | 45-55% | 35-45% | 5-10% | Uptime Institute |
2.5 Corridor and Passage Widths
| Context | Minimum Width | Optimal Width | Code Basis |
|---|---|---|---|
| Residential corridor (apartment) | 1.05 m (3'-6") | 1.2-1.5 m | IRC R311.6 |
| Residential common corridor | 1.1 m | 1.5 m | IBC 1020.2 / ADA |
| Office corridor | 1.2 m (< 50 occ.) | 1.8 m | IBC 1020.2 |
| Hospital corridor (patient) | 2.4 m (8'-0") | 2.7 m | FGI 2022 |
| Hospital corridor (service) | 1.8 m | 2.1 m | FGI 2022 |
| School corridor | 1.8 m | 2.4 - 3.0 m | IBC / BB103 |
| Assembly egress | 1.5 m min | Calc: 7.6mm/person | IBC 1005.1 |
| Accessible route | 0.915 m (36") | 1.2 m | ADA 403.5.1 |
| Accessible passing space | 1.525 m (60") | At intervals < 61 m | ADA 403.5.3 |
2.6 Window-to-Wall Ratio by Orientation & Climate
| Climate Zone (ASHRAE) | North WWR | East WWR | South WWR | West WWR | Total Max | Source |
|---|---|---|---|---|---|---|
| CZ 1-2 (Hot) | 20-30% | 15-20% | 20-30% | 10-15% | 30% | ASHRAE 90.1-2022 |
| CZ 3-4 (Mixed) | 25-35% | 20-25% | 30-40% | 15-20% | 40% | ASHRAE 90.1-2022 |
| CZ 5-6 (Cold) | 25-40% | 20-30% | 35-50% | 20-25% | 40% | ASHRAE 90.1-2022 |
| CZ 7-8 (Subarctic) | 20-30% | 15-25% | 30-45% | 15-20% | 35% | ASHRAE 90.1-2022 |
| Passive House (any) | Per PHPP calc | Per PHPP calc | Maximize | Minimize | Per PHPP | PHI |
Note: ASHRAE 90.1-2022 prescriptive max WWR is 30% (Table 5.5-0-5.5-8); higher ratios require trade-off (ECB/PRM) compliance path. South = equator-facing.
2.7 Thermal Transmittance (U-values) by Climate Zone
| Component | CZ 1-2 (Hot) | CZ 3-4 (Mixed) | CZ 5-6 (Cold) | CZ 7-8 (Subarctic) | Passive House | Source |
|---|---|---|---|---|---|---|
| Wall (above grade) | 0.70 W/m2K | 0.45 W/m2K | 0.27 W/m2K | 0.18 W/m2K | <= 0.15 W/m2K | ASHRAE 90.1 / PHI |
| Roof | 0.36 W/m2K | 0.27 W/m2K | 0.18 W/m2K | 0.12 W/m2K | <= 0.15 W/m2K | ASHRAE 90.1 / PHI |
| Floor (slab-on-grade, F-factor) | 1.26 W/mK | 0.90 W/mK | 0.73 W/mK | 0.54 W/mK | <= 0.15 W/m2K | ASHRAE 90.1 / PHI |
| Window (U-factor) | 3.69 W/m2K | 2.56 W/m2K | 1.98 W/m2K | 1.36 W/m2K | <= 0.80 W/m2K | ASHRAE 90.1 / PHI |
| Window SHGC (max) | 0.25 | 0.25-0.40 | 0.40 | 0.40 | Per PHPP | ASHRAE 90.1 |
2.8 Stair Dimensions
| Parameter | Minimum (Code) | Optimal | Maximum | Source |
|---|---|---|---|---|
| Riser height | 100 mm (4") | 170-178 mm | 196 mm (7-3/4") IBC; 180mm UK | IBC 1011.5.2 / AD-K |
| Tread depth (going) | 254 mm (10") | 279-300 mm | -- | IBC 1011.5.2 |
| 2R + G comfort rule | 600 mm min | 620-640 mm | 660 mm max | Neufert / Blondel |
| Stair width (< 50 occ.) | 914 mm (36") | 1100 mm | -- | IBC 1011.2 |
| Stair width (> 50 occ.) | 1118 mm (44") | 1200-1500 mm | -- | IBC 1011.2 |
| Handrail height | 864 mm (34") | 900-1000 mm | 965 mm (38") | IBC 1014.2 |
| Landing depth | >= stair width | >= stair width | -- | IBC 1011.6 |
| Headroom | 2032 mm (80") | 2200 mm | -- | IBC 1011.3 |
2.9 Elevator Sizing
| Building Type | Rule of Thumb | Car Capacity | Speed | Source |
|---|---|---|---|---|
| Residential (< 10 stories) | 1 lift per 90 units | 8-person (630 kg) | 1.0-1.6 m/s | BS EN 81-70 / Neufert |
| Residential (10-25 stories) | 1 lift per 60-75 units | 10-13 person (1000 kg) | 1.6-2.5 m/s | CIBSE Guide D |
| Office (low-rise, < 10 fl) | 1 lift per 2,500-3,000 m2 NLA | 13-16 person (1150 kg) | 1.6-2.5 m/s | BCO / CIBSE Guide D |
| Office (mid-rise, 10-25 fl) | 1 lift per 2,000-2,500 m2 NLA | 16-21 person (1600 kg) | 2.5-4.0 m/s | CIBSE Guide D |
| Office (high-rise, 25+ fl) | Sky-lobby + shuttle | 21-26 person (2000 kg) | 4.0-10.0 m/s | CIBSE Guide D |
| Hospital (bed elevator) | Min 1 per 100 beds | 26-person (2500 kg) | 1.0-1.6 m/s | FGI / DH HTM 08-02 |
| Goods / service lift | Per loading dock count | 2000-5000 kg | 0.5-1.0 m/s | Neufert |
| Interval target (office) | -- | -- | <= 30 sec | CIBSE Guide D |
| Handling capacity (5 min) | 12-15% of population | -- | -- | BCO / CIBSE |
2.10 Parking Dimensions
| Parameter | Standard | Compact | Accessible | Source |
|---|---|---|---|---|
| Stall width | 2.5 m (8'-6") | 2.3 m (7'-6") | 3.66 m (12'-0") + 1.52m (5') aisle | IBC / ADA 502.2 |
| Stall depth | 5.5 m (18'-0") | 4.6 m (15'-0") | 5.5 m (18'-0") | IBC / Neufert |
| Aisle width (90-deg) | 7.3 m (24'-0") | 6.7 m (22'-0") | 7.3 m (24'-0") | IBC / Neufert |
| Aisle width (60-deg angle) | 5.5 m (18'-0") | 5.0 m (16'-6") | 5.5 m (18'-0") | Neufert |
| Aisle width (45-deg angle) | 3.7 m (12'-0") | 3.4 m (11'-0") | 3.7 m (12'-0") | Neufert |
| Van-accessible width | -- | -- | 3.35 m (11'-0") + 2.44m (8') aisle | ADA 502.2 |
| Accessible count (1-25 total) | -- | -- | 1 space | ADA 208.2 |
| Accessible count (26-50) | -- | -- | 2 spaces | ADA 208.2 |
| Accessible count (51-75) | -- | -- | 3 spaces | ADA 208.2 |
| Ramp grade (parking) | -- | -- | 5% max (1:20) | ADA 405.2 |
| Drive lane gradient max | 15% (1:6.67) | -- | -- | IBC / BS 8300 |
2.11 Loading Dock Dimensions
| Parameter | Value | Source |
|---|---|---|
| Loading berth width | 3.66 m (12'-0") | Neufert / AGS |
| Loading berth depth | 18.3 m (60'-0") for WB-67 truck | AASHTO / AGS |
| Dock door height | 2.74 m (9'-0") min, 3.05 m (10'-0") preferred | AGS |
| Dock door width | 2.74 m (9'-0") min, 3.05 m (10'-0") preferred | AGS |
| Dock leveler platform depth | 1.83 m (6'-0") | AGS |
| Apron depth (for turning) | 36.6 m (120'-0") for WB-67 | AASHTO |
| Dock height above grade | 1.22-1.37 m (48"-54") | AGS |
2.12 Fire Resistance Ratings by Construction Type
| Construction Type (IBC) | Structural Frame | Bearing Walls (ext) | Bearing Walls (int) | Floor | Roof | Source |
|---|---|---|---|---|---|---|
| Type IA (fireproof) | 3 hr | 3 hr | 3 hr | 2 hr | 1.5 hr | IBC Table 601 |
| Type IB | 2 hr | 2 hr | 2 hr | 2 hr | 1 hr | IBC Table 601 |
| Type IIA (protected) | 1 hr | 1 hr | 1 hr | 1 hr | 1 hr | IBC Table 601 |
| Type IIB (unprotected) | 0 hr | 0 hr | 0 hr | 0 hr | 0 hr | IBC Table 601 |
| Type IIIA | 1 hr | 2 hr | 1 hr | 1 hr | 1 hr | IBC Table 601 |
| Type IIIB | 0 hr | 2 hr | 0 hr | 0 hr | 0 hr | IBC Table 601 |
| Type IV (heavy timber) | HT | 2 hr | 1 hr / HT | HT | HT | IBC Table 601 |
| Type VA (protected wood) | 1 hr | 1 hr | 1 hr | 1 hr | 1 hr | IBC Table 601 |
| Type VB (unprotected wood) | 0 hr | 0 hr | 0 hr | 0 hr | 0 hr | IBC Table 601 |
2.13 Acoustic Performance Ratings
| Adjacency | STC Minimum | STC Recommended | IIC Minimum | IIC Recommended | Source |
|---|---|---|---|---|---|
| Unit-to-unit (residential wall) | 50 | 55-60 | -- | -- | IBC 1207.2 |
| Unit-to-unit (residential floor/ceiling) | 50 | 55-60 | 50 | 55-60 | IBC 1207.3 |
| Classroom-to-classroom | 50 | 55 | -- | -- | ANSI S12.60 |
| Classroom-to-corridor | 45 | 50 | -- | -- | ANSI S12.60 |
| Office-to-office (closed) | 45 | 50 | -- | -- | ASTM E90 / GSA |
| Exam room-to-exam room | 50 | 55 | -- | -- | FGI 2022 |
| Patient room-to-patient room | 50 | 55 | -- | -- | FGI 2022 |
| OR to adjacent spaces | 55 | 60 | -- | -- | FGI 2022 |
| Hotel room-to-room | 50 | 55-60 | 50 | 55-60 | Brand + IBC |
| Music room / practice | 60 | 65 | 55 | 60 | BB93 / ANSI S12.60 |
| Background noise (classroom) | -- | <= 35 dBA | -- | -- | ANSI S12.60 |
| Background noise (office, open) | -- | 40-45 dBA | -- | -- | ASHRAE Handbook |
| Background noise (hospital, patient) | -- | 30-40 dBA | -- | -- | FGI / WHO |
| RT60 (classroom, furnished) | -- | 0.4-0.6 s | -- | -- | BB93 / ANSI S12.60 |
| RT60 (office, open plan) | -- | 0.5-0.8 s | -- | -- | ASHRAE / WELL |
2.14 Daylighting Metrics
| Metric | Space Type | Minimum | Target | Source |
|---|---|---|---|---|
| Daylight Factor (DF) | Residential living room | 1.0% | 2.0% | BS EN 17037 |
| Daylight Factor (DF) | Office workspace | 2.0% | 3.0-5.0% | CIBSE LG10 / EN 17037 |
| Daylight Factor (DF) | Classroom | 2.0% | 3.0-5.0% | BB90 / EN 17037 |
| Daylight Factor (DF) | Hospital ward | 1.0% | 2.0-3.0% | HBN / EN 17037 |
| Spatial Daylight Autonomy (sDA) | Office (LEED v4.1) | 55% area >= 300 lux for 50% hours | 75% area (2 pts) | LEED BD+C v4.1 EQ c7 |
| Annual Sunlight Exposure (ASE) | Office (LEED v4.1) | <= 10% area > 1000 lux for 250 hrs | -- | LEED BD+C v4.1 EQ c7 |
| Useful Daylight Illuminance (UDI) | Office | 100-3000 lux for 50%+ hours | -- | Nabil & Mardaljevic |
| Illuminance (electric + day) | Office task area | 300 lux min | 500 lux | EN 12464-1 |
| Illuminance | Classroom | 300 lux min | 500 lux | EN 12464-1 |
| Illuminance | Hospital ward | 100 lux general | 300 lux reading | EN 12464-1 |
| Illuminance | Corridor / circulation | 100 lux | 150 lux | EN 12464-1 |
3. Building Typology Taxonomy
3.1 Residential
| Sub-type | Key Design Drivers | Critical Metrics |
|---|---|---|
| Single-family detached | Orientation, privacy, outdoor space, garage/parking, local zoning setbacks | Lot coverage 30-50%, FAR 0.3-0.8, min lot area per unit |
| Multi-family apartment | Unit mix, dual aspect, core efficiency, daylight access, acoustic separation, bike/bin stores | Net-to-gross 78-85%, units/core 6-10, min unit sizes per local code |
| Mixed-use residential | Ground-floor activation, servicing separation, structural transfer, acoustic isolation between uses | Residential lobby separate from commercial, STC 55+ floor assembly |
| Student housing | Cluster flats (5-8 beds sharing kitchen), en-suite ratio, social/study space, laundry | 10-14 m2/bed-space, 1 washing machine per 20 students |
| Senior living / care | Accessibility throughout, assisted living vs. independent, dementia wayfinding, nurse call | Min 28 m2 single room, 1:8 staff ratio (care), 100% visitable units |
| Co-living | Shared kitchens/living, private bedrooms, community programming, flexible lease | 12-16 m2 private, 4-6 m2 shared/person, high common area ratio |
3.2 Commercial
| Sub-type | Key Design Drivers | Critical Metrics |
|---|---|---|
| Office (speculative) | Floor plate efficiency, daylight penetration, flexible fit-out, HVAC zoning, raised floor/ceiling void | 12-20 m2/person, 1:8-1:10 desk ratio (hybrid), <= 15m core-to-facade |
| Office (owner-occupied) | Bespoke program, long-term adaptability, identity/brand | Similar metrics, higher fit-out spec |
| Retail (high street) | Frontage, visibility, servicing rear, floor loading 5 kN/m2, grease traps for food | Min 4.5m ground floor-to-floor, 6m frontage min |
| Retail (shopping centre) | Anchor tenants, footfall routing, service corridors, food court ventilation | 15-25 m2 GLA per 1000 catchment population |
| Hospitality (hotel) | Room count, F&B, back-of-house ratio, brand compliance, views | 28-42 m2/key (midscale-upscale), BOH 15-20% GFA |
| Hospitality (restaurant) | Kitchen:dining ratio 1:2.5-1:3, ventilation 15-30 ACH kitchen, grease duct | 1.5-2.0 m2/seat, 100-150 covers per service |
3.3 Institutional
| Sub-type | Key Design Drivers | Critical Metrics |
|---|---|---|
| Primary/elementary school | Classroom cluster, secure entry, outdoor play 10 m2/pupil, safeguarding sightlines | 2.0-2.5 m2/pupil (classroom), BB103 area guidelines |
| Secondary school | Subject departments, assembly hall, sports hall, science labs with fume hoods | 2.5-3.0 m2/pupil (classroom), 594+ m2 sports hall |
| University | Lecture theatres (0.65 m2/seat), labs, library, flexible learning, research | AUDE space norms: 8-12 m2/FTE |
| Hospital (acute) | Clinical adjacencies, infection control, sterile corridors, logistics, helipad | 50-80 m2 GIA per bed (varies by acuity) |
| Clinic / primary care | Exam rooms 11-13 m2, waiting 1.4 m2/person, reception sightlines | 6-8 exam rooms per GP |
| Museum / gallery | Daylight control, UV filtration, RH 45-55%, temp 20-22C, floor loading 5 kN/m2 | 25-40 m2 per visitor at peak, 5 lux (sensitive) to 300 lux |
| Library | Stack area 5-6 shelves/m2, reading 2.5 m2/seat, acoustic zones, RFID | 30 books/linear m shelving, 2.3-4.6 m2/1000 pop |
| Religious (church) | Liturgical axis, acoustics RT60 1.5-3.0 s, assembly seating, bell tower | 0.6-0.8 m2/seat (pew), 0.9 m2/seat (chairs) |
| Civic (courthouse, city hall) | Security screening, public/restricted separation, council chamber acoustics | Courtroom min 85 m2, holding cells, judge chambers |
3.4 Industrial
| Sub-type | Key Design Drivers | Critical Metrics |
|---|---|---|
| Manufacturing (light) | Column-free span, overhead crane, floor loading 10-50 kN/m2, goods access | 6-12 m clear height, 10% office ratio |
| Manufacturing (heavy) | Crane rail at 12-20 m height, vibration isolation, heavy floor loading | 50-200 kN/m2 floor, crane capacity 5-50 tonne |
| Warehouse / distribution | Racking height, truck court depth 40 m, cross-dock, dock-to-floor ratio | 10-15 m clear height, 1 dock per 1000-1500 m2 |
| Logistics / e-commerce | Sortation systems, mezzanine, EV charging, last-mile dispatch | 12-18 m clear, floor flatness FM2/DM2, 50+ docks |
| Cold storage | Vapor barrier, insulation R-40+, ante-chambers, condensation control | -25C to +4C, 300mm+ insulated panel, air-lock entries |
3.5 Special Purpose
| Sub-type | Key Design Drivers | Critical Metrics |
|---|---|---|
| Transportation hub | Wayfinding, crowd flow 1.3 m/s, platform edge safety, intermodal transfer | LOS C-D: 2.0-3.5 m2/person (Fruin) |
| Sports / arena | Sightlines (C-value), spectator flow 66 persons/m/min, structural clear span, retractable roof | 0.45-0.5 m2/seat, 8 min full evacuation |
| Data center | Power density 5-20 kW/rack, cooling, UPS, redundancy (N+1 to 2N), raised floor 600mm | PUE target <= 1.2, Tier III: 99.982% uptime |
| Performing arts | Acoustics RT60 1.4-2.2 s (symphonic), fly tower 2.5x proscenium, orchestra pit | 0.6 m2/seat, NC-20 to NC-25 background noise |
| Laboratory | Fume hood density, ACH 6-12, vibration class VC-A to VC-E, chemical storage | 10-14 m2/researcher, 100% outside air |
4. Design Quality Framework
4.1 Composite Quality Checklist
Drawing from RIBA Plan of Work 2020 (Stages 0-7), AIA Framework for Design Excellence, CABE/Design Council Building for Life 12, and the Vitruvian triad.
Firmitas (Structural Soundness & Durability)
- Structural system matched to span, loading, and building height requirements
- Foundation type appropriate to ground conditions (geotechnical report reviewed)
- Design life defined: 50 yr (standard), 100 yr (monumental/infrastructure), per EN 1990 Table 2.1
- Material durability class specified (timber: EN 350; steel: corrosion protection; concrete: exposure class EN 206)
- Movement joints located at max 40-60 m intervals (concrete) or as per thermal analysis
- Robustness / progressive collapse resistance verified (EN 1991-1-7, GSA guidelines for federal)
- Waterproofing strategy defined for below-grade and wet areas (BS 8102 grade)
- Roof drainage: primary + secondary overflow, max 150 m2 per outlet
Utilitas (Functional Fitness)
- Brief / program validated against area benchmarks (see Section 2.4 net-to-gross)
- All rooms meet minimum dimensions for intended furniture/equipment
- Circulation is intuitive: max 2 direction changes from entry to any primary space
- Core location optimizes travel distances to all floor areas (centroid analysis)
- Servicing strategy: risers, plant rooms, maintenance access all confirmed
- Storage provision: residential min 3-6 m2/unit (varies by bed count), office 5-8% NIA
- Waste strategy: bin store sized at 0.01 m3/unit/week minimum
- Loading/delivery: vehicle tracking verified, turning circles confirmed
- IT/comms: riser positions, containment routes, equipment room cooling confirmed
Venustas (Experiential Quality & Delight)
- Arrival sequence designed: approach, threshold, reception, orientation
- Natural light reaches all primary occupied spaces (DF > 2% or sDA > 55%)
- External views from all workstations/desks (WELL v2 Feature L01: >= 75% of area)
- Material palette limited (3-5 primary materials) with intentional juxtaposition
- Color and texture vary by spatial hierarchy (public > semi-public > private)
- Acoustic comfort: background noise within target range for each space type
- Biophilic elements: planting, water, natural materials, prospect/refuge, fractal patterns
- Proportional coherence: key rooms tested against golden ratio, Modulor, or grid geometry
Context & Place (CABE / Building for Life 12)
- Building relates to surrounding urban grain (street pattern, block morphology, density)
- Height and massing respect context: shadow studies confirm no adverse overshadowing (BRE 209 criteria: > 2 hrs sun on March 21)
- Ground floor activates street edge: transparent, accessible, programmed
- Public realm contribution: setbacks, planting, seating, lighting specified
- Local material/typological language referenced or consciously departed from
- Parking concealed or de-emphasized from primary streetscape
Sustainability & Performance (AIA / LEED / BREEAM / Passive House)
- Energy target defined: EUI (kBtu/ft2/yr or kWh/m2/yr) benchmarked against type
- Operational carbon: annual CO2 per m2 target set (RIBA 2030 Challenge targets)
- Embodied carbon: kgCO2e/m2 target set (LETI 2020: < 500 kgCO2e/m2 residential, < 600 office)
- Passive strategies exhausted before active: orientation, massing, shading, insulation, thermal mass, ventilation
- Renewable energy: roof area reserved for PV, target >= 20% on-site generation
- Water: rainwater harvesting, greywater recycling, low-flow fixtures (< 6 L/flush, < 1.9 L/min lavatory)
- Biodiversity net gain: green/brown roofs, bird/bat boxes, native planting (UK: 10% BNG min)
- Circular economy: design for disassembly, material passport, 80%+ diversion from landfill
Accessibility & Inclusion (ADA 2010 / BS 8300 / EN 17210)
- Level access at all primary entrances (max 6mm threshold)
- Accessible route connects all levels: lift or ramp (1:20 max gradient, 1:12 max with 760mm rise)
- Accessible WC provision: min 1 per floor, 1500mm turning circle, grab rails per ADA 604
- Signage: tactile, high-contrast (70% min LRV difference), Braille at 1200-1500mm AFL
- Hearing enhancement: induction loops in assembly spaces > 50 m2 (BS 8300-2)
- Refuge areas at each stairway on floors above/below exit discharge (IBC 1009.3)
- Colour/texture change at level transitions, stair nosings, glass manifestation bands
5. Anti-Pattern Catalog
5.1 Planning & Massing Failures
| Anti-Pattern | Failure Mode | Fix |
|---|---|---|
| Deep plan without daylight | Plan depth > 15 m from facade with no atrium or courtyard. Interior zones permanently artificially lit. Energy waste, poor wellbeing (WELL L01 failure). | Max 12-15 m occupied depth. Introduce lightwells, atria, or courtyards. Use borrowed light through glazed partitions. |
| Single-aspect apartments | All rooms face one direction. No cross-ventilation. Overheating if west-facing. Poor daylight in rooms far from facade. | Require dual-aspect for >= 50% of units (London Plan Policy D6). Single-aspect max depth 8 m, never north-facing. |
| Corridor-only circulation | Long double-loaded corridors (> 20 m) with no daylight, no widening, no social function. Dead space consuming 18-22% of GFA. | Introduce gallery access (daylit), skip-stop sections (Corbusier Unite type), widen at nodes for seating/post. |
| Structural grid misaligned with program | 9 m office grid producing 4.5 m half-bays that are too small for hotel rooms (need 3.6-4.2 m) in conversion or mixed-use. | Establish grid from most constrained use first. Parking (5.4 m module) often governs. Test grid against all programs during concept. |
| Tower-on-podium without wind mitigation | Tall building creates ground-level wind acceleration (Venturi effect) making podium spaces unusable. Lawson LDDC comfort criteria fail. | Chamfer/setback lower floors, add canopies, porous podium edges, wind baffles. CFD testing at concept stage. |
5.2 Envelope & Environmental Failures
| Anti-Pattern | Failure Mode | Fix |
|---|---|---|
| Over-glazed facades | WWR > 60% causing overheating (> 28C for > 1% occupied hours, CIBSE TM52), glare, high cooling loads, condensation risk in cold climates. | Limit WWR per Section 2.6. Use external shading (brise-soleil, overhangs). Specify high-performance glass (SHGC < 0.25 south/west). |
| Thermal bridging at balconies | Concrete balcony slab continuous with floor slab creates cold bridge. Surface condensation, mould risk, heat loss 15-30% increase. | Thermal break connectors (Schock Isokorb or equivalent). Or structurally independent balconies. |
| Flat roof without redundancy | Single waterproofing layer, no secondary drainage. Single point of failure leads to catastrophic leaks. | Dual membrane or inverted roof. Secondary drainage (scupper overflow) at 50mm above primary. Min 1:60 fall (1:40 preferred). |
| Curtain wall without maintenance strategy | No BMU provision, no cradle track, no accessible cleaning positions. Facade degrades. | Design BMU/cradle system from concept. Max 1.5m reach from cradle. Track loads into structure from Stage 2. |
5.3 Services & Systems Failures
| Anti-Pattern | Failure Mode | Fix |
|---|---|---|
| Service risers as afterthought | Risers sized for current load only, in awkward locations, no future capacity. Renovation requires destructive work. | Size risers at 130% current requirement. Locate adjacent to cores. Stack vertically through all floors. Access panels on every floor. |
| Acoustic separation ignored between uses | Residential above restaurant/bar: airborne noise (bass/music) and impact noise (kitchen equipment) transmit through structure. | STC 60+ floor assembly. Structural break (floating slab or resilient mount). Vibration-isolated kitchen equipment. Separate structure ideal. |
| Fire compartmentation compromising spatial flow | Fire doors on closers bisecting open-plan spaces. Users prop doors open, defeating purpose. | Use hold-open devices connected to fire alarm (release on alarm). Designate clear compartment lines at natural spatial transitions. Smoke curtains for atria. |
| HVAC zoning mismatch | Single zone serves both perimeter (solar gain variable) and interior (constant internal gains). Temperature complaints, energy waste. | Min 4 perimeter zones (N/E/S/W) + interior zone per floor. Max 50 m2 per zone in cellular office. VAV with individual zone control. |
| Inadequate ceiling void | 150mm void expected to contain HVAC ducts (200-400mm), sprinkler mains (100mm), cable trays (75mm), lighting (50mm), and structure. Physical clash. | Min 400mm distribution void for residential, 600mm for office (BCO), 900mm+ for hospital. Coordinate BIM clash detection at Stage 3. |
5.4 Accessibility & Inclusion Failures
| Anti-Pattern | Failure Mode | Fix |
|---|---|---|
| Accessibility retrofitted | Ramps added post-completion to entrances with steps. Clumsy, stigmatizing, expensive. "Accessible" route through loading dock. | Level access designed from concept. Principal entrance IS the accessible entrance. No separate "accessible entrance." |
| Wheelchair refuge blocks stairway | Refuge area encroaches on stair landing, reducing effective width below code minimum during evacuation. | Refuge area: min 760 x 1300 mm (ADA) clear of required stair width. Locate in widened landing or adjacent corridor. |
| Inaccessible upper floors in < 3-storey building | No lift provided because code exempts buildings under certain size. Entire floors inaccessible to wheelchair users. | Install lift regardless of exemption. An accessible building is a better building. Cost: 2-4% of construction budget. |
5.5 Sustainability Failures
| Anti-Pattern | Failure Mode | Fix |
|---|---|---|
| All-glass tower in hot climate | SHGC not controlled, no external shading. Cooling load dominates energy. LEED/BREEAM energy credits impossible. | Max 40% WWR. External shading. High-performance low-e glass. Consider double-skin facade with ventilated cavity. |
| Demolish-and-rebuild vs. retrofit | Embodied carbon of new building (400-800 kgCO2e/m2) exceeds operational savings for 30+ years. | Lacaton & Vassal principle: never demolish. Assess retrofit first. Whole-life carbon assessment per EN 15978. |
| Greenwashing with certification | Pursuing LEED points in documentation/innovation while ignoring energy performance. Certified Gold building performing worse than code baseline. | Prioritize energy (EAc2 Optimize) and water (WEc2) credits. Set absolute EUI target, not just relative improvement. Monitor post-occupancy. |
6. Skill Router
When the architect-foundations layer activates, route the user's query to the appropriate specialized skill based on the following decision logic.
START
|
+-- Is the query about design theory, philosophy, or architect references?
| YES --> [design-theory]
| NO --> continue
|
+-- Is the query about building program, area scheduling, or brief development?
| YES --> [building-programming]
| NO --> continue
|
+-- Is the query about early massing, parti, or schematic design?
| YES --> [concept-design]
| NO --> continue
|
+-- Is the query about a specific building type, typological analysis, or precedent?
| YES --> [building-typology]
| NO --> continue
|
+-- Is the query about room layouts, adjacencies, furniture, or space planning?
| YES --> [spatial-planning]
| NO --> continue
|
+-- Is the query about facade, wall assembly, insulation, roofing, or thermal performance?
| YES --> [building-envelope]
| NO --> continue
|
+-- Is the query about structural systems, spans, columns, foundations, or lateral systems?
| YES --> [structural-systems]
| NO --> continue
|
+-- Is the query about HVAC, plumbing, electrical, or MEP coordination?
| YES --> [building-services]
| NO --> continue
|
+-- Is the query about natural light, sun studies, or daylight metrics?
| YES --> [daylighting-design]
| NO --> continue
|
+-- Is the query about material properties, selection, finishes, or specifications?
| YES --> [material-selection]
| NO --> continue
|
+-- Is the query about IBC, local codes, zoning, FAR, or regulatory compliance?
| YES --> [building-codes]
| NO --> continue
|
+-- Is the query about ADA, accessibility routes, inclusive design, or universal design?
| YES --> [accessibility-design]
| NO --> continue
|
+-- Is the query about fire egress, compartmentation, sprinklers, or NFPA?
| YES --> [fire-life-safety]
| NO --> continue
|
+-- Is the query about STC, IIC, reverberation, noise control, or room acoustics?
| YES --> [acoustic-design]
| NO --> continue
|
+-- Is the query about LEED, BREEAM, Passive House, WELL, embodied carbon, or energy?
| YES --> [building-sustainability]
| NO --> continue
|
+-- Is the query about drawings, details, specifications, BIM, or construction docs?
| YES --> [construction-documentation]
| NO --> continue
|
+-- Is the query a calculation (area, U-value, daylight factor, structural, cost)?
| YES --> [architect-calculator]
| NO --> continue
|
+-- Default: answer from [architect-foundations] knowledge base directly.
Multiple topics? Route to primary skill, cross-reference secondary.Multi-Skill Queries
When a query spans multiple domains, apply this priority:
- Safety-critical skills take precedence: fire-life-safety > building-codes > accessibility-design > structural-systems
- Performance skills next: building-envelope > building-services > daylighting-design > acoustic-design > building-sustainability
- Design skills follow: concept-design > spatial-planning > building-typology > design-theory > material-selection
- Documentation skills last: construction-documentation > building-programming > architect-calculator
Always provide the foundational context from this skill, then defer to the specialized skill for depth.
*Sources: IBC 2021, IRC 2021, NFPA 101 2021, ADA 2010 Standards, ASHRAE 90.1-2022, ASHRAE 62.1-2022, EN 1990-1999 (Eurocodes), EN 17037, EN 12464-1, BS 8300:2018, BS 9999:2017, BB93, BB103, CIBSE Guides A/B/D/LG10/AM10, BCO Guide to Specification 2019, Neufert Architects' Data 5th Ed, Architectural Graphic Standards 12th Ed, FGI Guidelines for Design and Construction of Hospitals 2022, RIBA Plan of Work 2020, LEED BD+C v4.1, BREEAM New Construction SD5078 2024, Passive House Institute criteria, WELL v2 Q3 2023, AUDE/HEFCE Space Management Guide, BRE 209 Site Layout Planning for Daylight and Sunlight, LETI Climate Emergency Design Guide 2020.*