VIDRAFT Releases "Building": An AI Architectural Design Service Powered by Darwin-398B — Free Open Research Preview
TL;DR: VIDRAFT has launched Building (빌딩), a free open-research-preview architectural design service driven by its in-house Darwin-398B model. Given a single natural-language prompt, it generates KS-standard floor plans with compliance checks, exportable CAD/BIM files, and real-time cost estimates — no architectural software expertise required. Developers and AEC professionals can sign up now for the preview.
What it is
Building is a domain-specific AI service built on top of VIDRAFT's Darwin-398B foundation model, targeting the early-stage, high-iteration work that architects and developers do before a project is even formally commissioned. The service ships in two distinct modes:
- Unit Design (세대 설계): Accepts a single Korean natural-language description (e.g., "84 m² apartment, 3 bedrooms, south-facing living room, open-plan kitchen") and produces a complete floor plan that conforms to KS F 1501 (Korean Standard for Architectural Drawing), the national standard for architectural representation.
- Site Design (대지 설계): Accepts a Korean cadastral address (지번) and automatically pulls public land data from the Ministry of Land's V-World open-data API, then generates a compliant 3D building mass in roughly 3 seconds.
Output formats for Unit Design include:
- AutoCAD-compatible DXF drawings
- A3 PDF drawing sheets
- IFC models (compatible with major BIM software)
- Room-level quantity takeoffs in Excel (적산/물량산출서), including rough construction cost estimates
How it works
Unit Design pipeline
At a conceptual level, the service runs a parallel multi-draft generation step: given a natural-language requirement, Darwin-398B produces several candidate floor plans simultaneously. A separate AI reviewer component then scores and selects the best candidate automatically — so the "best" result surfaces without manual comparison.
Beyond the AI selection step, six categories of rule-based automated compliance checks run against every output, each citing the relevant legal clause:
- Building Act abridged review (daylighting, ventilation, minimum habitable area)
- Fire safety review (extinguisher walking distance, refuge space, evacuation routes)
- Barrier-free (BF) accessibility
- Design KPIs
- Rough construction cost
- AI quality audit
Critically, the spatial layout quality score — which evaluates zoning, privacy, solar orientation, circulation, and proportions — is computed via deterministic, rule-based logic, not AI self-evaluation. This is an intentional design choice to make the score reproducible and auditable.
Completed plans can be visualized in 3D, walked through in a first-person "walk mode," tested with seasonal/time-of-day solar shadow simulation, and rendered into photorealistic images via AI rendering.
Site Design pipeline
When a cadastral address is entered, the system queries V-World to retrieve zoning class, parcel boundary, parcel area, and land value. Building coverage ratio (건폐율) and floor-area ratio (용적률) legal ceilings are then applied — not as warning labels, but as geometric constraints: the building footprint is mathematically capped so it cannot exceed the coverage ratio, and in residential zones, the north solar access setback angle (Building Act Enforcement Decree Article 86) physically slices the upper floors of the generated mass, producing the characteristic stepback profile seen in Korean apartment towers.
A FAR slider lets users adjust floor-area ratio in real time, with floor count, gross floor area, rough cost, and estimated unit count recalculating live.
Surrounding buildings are rendered at their actual heights so that view openings and solar impact can be assessed in context. Regulatory checklists (e.g., sprinklers above 6 floors, emergency elevators above 31 m) are surfaced automatically with statutory citations.
Benchmarks & results
No third-party benchmark scores are published for this preview release. VIDRAFT shared one demonstrative result from a commercial parcel in Gangnam-gu, Seoul:
- At FAR 1,300% → 17 floors, ~54,000 m² gross floor area
- At FAR 650% → 9 floors, ~27,000 m² gross floor area
The gray mass can be converted to a photorealistic aerial render (day/dusk/night) in approximately 15 seconds, and a land parcel lookup completes in approximately 3 seconds. These are figures cited by VIDRAFT for illustrative purposes in the preview announcement.
How to try it
Building is available as a free open research preview — VIDRAFT is actively collecting feedback from testers. Access appears to be web-based. No Hugging Face model weights, GitHub repository, or OpenAI-compatible API endpoint has been announced for this release. To join the preview:
- Visit VIDRAFT's official channels for sign-up details (check vidraft.ai or their announcement pages).
- The open research preview is free of charge at this stage.
No pip install, huggingface-cli, or API curl commands are available at this time — the service is accessed through a web interface.
FAQ
Q: Are the outputs legally valid architectural drawings?
A: No. VIDRAFT explicitly labels all outputs as conceptual design reference materials with no legal standing. Building coverage ratio and FAR figures also reflect statutory national ceilings — local municipal ordinances may impose stricter limits and must be verified separately.
Q: Is Darwin-398B available as a standalone model (weights / API)?
A: Not announced as part of this release. Darwin-398B currently powers the Building service backend; no public model weights or standalone API have been disclosed.
Q: Can the service handle non-Korean addresses or international building codes?
A: Based on the current announcement, the service is scoped to Korean cadastral addresses (via V-World) and Korean standards (KS F 1501, Korean Building Act). International jurisdiction support has not been announced.
Q: What file formats can I export?
A: DXF (AutoCAD-compatible), PDF (A3 drawing sheets), IFC (BIM-compatible), and Excel quantity takeoff sheets — all available for download directly from the web interface.
Originally reported by 지디넷코리아 (2026-07-10) — source article.
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