Build a room-by-room 3D home design web app in under an hour with Claude Cowork

WorkedEvidence: Described by posterPosted Oct 28, 2026Last checked Nov 7, 2026

Claude Cowork built Michael Saif a web app in under an hour that shows each room of a planned house in rotatable 3D views.

Source checked Nov 7, 2026
Results shared

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Build a web app where I upload one or more floor plans, select a room, and see it in rotatable 3D views. Let me describe finishes in plain English, like a dark wood floor with blue walls, add furniture, save several designs per room and export any view as a PNG. Ask me any questions you need first, then build it in stages.

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Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: A simple tool to preview each room of a planned house in 3D.

Questions to ask me first:
- What format are the floor plans in?
- Who will use the app, and on what devices?
- What should users be able to change in each room?

Inputs (fill in or confirm):
- Floor plans: [PDF OR IMAGE FILES]
- Users: [NAMES, DEVICES]
- Changes: [FLOORS, WALLS, FURNITURE]
- Exports: [PNG]

Rules:
- Keep room dimensions true to the floor plan.
- Build in stages and show each one working.
- Save designs per room without overwriting earlier ones.
- Note where the 3D view is approximate.

Checkpoint: Show the floor plan upload and room selection working before adding 3D views.

If you get stuck: If a plan can't be read, let the user trace the room instead.

Verify before you finish: A sample plan produces correctly proportioned rooms.

Output: A working web app with saved designs and PNG export.

Done when: My friend can preview every room before building starts.

AI tool

Claude Cowork

Outcome

Michael Saif built a web app for a friend who is building a house, so the friend could see each finished room before anything was built. Saif described the idea to Claude Cowork, answered its questions in a short back-and-forth, and it built the app in four stages, taking less than an hour from start to finish. The app accepts one or more floor plans, shows any selected room in several rotatable 3D views, and redraws it on request, such as 'Show me with a dark colored wood floor with blue walls', then lighter floors or added furniture. Multiple designs can be saved for each room and any image exported as a PNG.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted: Oct 28, 2026 by Michael Saif (The Rundown community)
Last checked: Nov 7, 2026
Method:: How we verify

https://app.therundown.ai/community/posts/686a461b-668c-4149-ab0f-1883bf17e0a8

Context: Posted to The Rundown community (date from the post's UTC timestamp). The post doesn't say how accurate the 3D views are or how the friend has used them.