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Turn a floor plan into a walkable 3D house

Give Claude a floor plan and a few photos, and it builds every room to scale as a website you can walk through. Here's how the critic loop works, and a prompt to try it.

By Alan Brown · Works with Claude

Jump to the prompt ↓

🏠 Someone turned a flat floor plan into a 3D house you can walk through.

  • 💸 Builders spend hundreds of thousands building real model homes so buyers can look around. The average new US home costs over $400,000 just to build.
  • 🧠 This one was made with Claude Opus 5.5 and Three.js, a free 3D tool: x.com/everestchris6/status/2110036224320884998
  • 📐 You give Claude the floor plan and a few photos of the finished house, and it builds every room to scale as a website you can walk through.
  • 🔁 Then a second AI acts as a critic: it compares each room to the photos and sends it back until it matches.

Context & limitations

It's like a model home that lives in your browser. It's a creator's demo, not a builder's product yet, but buyers could one day tour a home and change things before a single brick is laid.

Do this yourself

Here is a floor plan and some photos of one house: ___ (attach them). Build it as a Three.js website I can walk through in the browser. Rules: 1. Build everything to scale from the floor plan. If a dimension is missing, ask me instead of guessing, one question at a time. 2. Match each room's layout, finishes and furniture to the photos. Where you have no photo, keep the room plain and say so. 3. Split the house into rooms. For each room, act as two roles: a builder who makes it, and a critic who compares a screenshot of the room with the matching photo, names the biggest difference, and sends it back. Repeat up to 3 times per room. 4. Add simple walk controls (WASD or arrow keys plus mouse look) and a small map showing where I am. 5. At the end, list what you could not match and why. Keep it as one HTML file I can open locally, and tell me how to run it.

A walkable model lets people feel a space before anything is built. The trick that makes it good is the second pass: a separate critic compares each room with the reference photos and sends it back until it matches.

Want to build this with a teacher?

Pathwise Academy runs small, hands-on AI classes in Singapore for ages 10–17 and adults.

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