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name: "generative-ai-design" description: "Generative design for construction: text-to-BIM concepts, option generation, and AI-assisted design iteration with cost and carbon feedback. Use when exploring early design options with AI."

Generative AI Design for Construction (2026)

What is real in 2026

Generative design in construction is option generation with feedback, not autonomous architecture: given site constraints, program and budget, an AI generates massing/typology options and scores them on cost, carbon and buildability — the human designer selects and refines.

The loop

Constraints (site, program, budget)
        │
        ▼
Generate options (LLM/parametric/optimisation)
        │
        ▼
Quantify each option (BIM takeoff + CWICR cost + carbon)
        │
        ▼
Score & rank (cost/m², kgCO₂e/m², GFA efficiency)
        │
        ▼
Human selects → refine → detail

Toolchain

Stage	Tools
Massing generation	parametric tools (Rhino/Grasshopper, Dynamo) + LLM sketches
Text-to-concept	image models (Midjourney/DALL·E) for moodboards; text-to-BIM is early-stage (Hypar, Finch, qbiq)
Quantification	OpenConstructionERP BIM takeoff (oce-bim-takeoff)
Cost scoring	CWICR cost bases (oce-load-cost-bases)
Carbon scoring	embodied-carbon-esg

Prompt pattern for concept generation

"Generate 3 massing options for a 12,000 m² residential building on a 30×60 m
plot, 6 storeys, max 40% glazing, Berlin climate. For each: GFA, FAR,
indicative structure, kgCO₂e/m² (A1-A3), €/m² construction cost."

Then quantify and rank:

Option	GFA	FAR	Cost/m²	kgCO₂e/m²	Verdict
A	11,800	2.9	1,050 €	310	lowest cost
B	12,400	3.1	1,180 €	285	lowest carbon
C	12,100	3.0	1,120 €	295	balanced

Guardrails

• AI options are starting points, always human-reviewed and code-checked.
• Cost/carbon scores come from real databases (CWICR + EPD), not LLM guesses.
• Keep every option's inputs logged (reproducibility, AI Act transparency).
• Text-to-BIM models are not yet permit-grade — treat outputs as concepts.

Resources

• Finch: https://finch3d.com · Hypar: https://hypar.io · qbiq: https://www.qbiq.ai
• Generative design overview: https://www.autodesk.com/solutions/generative-design