Free AI floor plan software for Windows

For a floor plan you intend to build from, look beyond the preview: you need dimensions you can check and drawing objects you can revise. AI CAD PRO creates an editable 2D drawing on your Windows PC.

You describe the plan: the overall size, the rooms, where the doors and windows go, the porch you’ve been picturing for years. The assistant draws walls, rooms, doors, windows and dimensions as real CAD objects. Then you both keep working on the same drawing until it’s right.

Some ways to start:

• “Draw a 28 by 40 foot single-story house with three bedrooms, two baths and an open kitchen and living room.”
• “Make the primary bedroom 14 by 16 and put the closet on the interior wall.”
• “Add an 8 foot deep covered porch across the front.”
• “Move the laundry next to the back door.”

Ask for revisions to the existing drawing, then inspect the result before continuing.

Start with a simple practice layout before describing a whole house. This example prompt is a drafting exercise, not a finished design or a permit plan:

“Draw a rectangular 20 by 24 foot studio floor plan. Treat those as outside dimensions and use 6 inch exterior walls. Put the entrance on the south wall and two windows on the north wall. Add overall dimensions and label the open room. Ask me for missing details before adding more rooms.”

1. Check the first drawing. Compare the outside dimensions with your request. Inside clear space is smaller because walls have thickness. Check which wall each opening is on and whether its location matches your intent.
2. Change one thing. Try: “Move the entrance 2 feet east along the south wall. Keep the outside footprint unchanged.” Inspect the door location and overall dimensions again; use the drawing tools to adjust an object directly when that is easier.
3. Add the real constraints. Supply measured room sizes, wall thicknesses, opening locations and any existing features you must retain. Do not use a guessed dimension from a sketch as a site measurement.
4. Review the sheet. Set its scale, open print preview and check that labels and dimension lines are readable before exporting a PDF. A readable drawing still needs the project-specific checks required by your building department.

For room layouts and more detailed requests, use the floor plan prompt examples. If you already have a sketch, follow the reference-file steps below.

You don’t have to describe everything. The drawing tools are right there when it’s faster to do it yourself: Select, Wall, Room, Door, Window, Dimension and Note. Drag a wall, retype a dimension, fix a label.

Rooms show their area, so you can see what a change does to the square footage while you work. Sheets are drawn at a scale you set, such as 1/4 inch to the foot, and every wall, dimension and note stays editable, whether you drew it or the assistant did.

You don’t need to know CAD to start. You’ll still want to review the plan carefully and give the assistant accurate information about your site and your project. It draws what you describe, so good information in means a good plan out.

Maybe you have a sketch on graph paper, the original plans for a house you’re remodeling, or a layout from a kit supplier. Attach it. AI CAD PRO accepts PDFs (including scanned plans), images, ASCII DXF files, and text or CSV files as references.

Ask the assistant to use the reference as a starting point, then check its dimensions against the original. Scans and photos can be unclear, and you know your project better than any file does.

AI CAD PRO can’t open DWG files. If a plan lives in other CAD software, export it as a PDF or an ASCII DXF and attach that. You can also reuse work from your other saved projects, like the plot plan you drew for last year’s shed.

A floor plan is usually the first sheet, not the last. The same project can hold the sheets that build on it:

• Elevations and sections
• An electrical plan and one-line diagram
• A site plan showing where the building sits on your lot
• Solar plans if you’re adding panels

Print preview shows each sheet exactly as it will print. When you’re ready, export a coordinated PDF sheet set on Letter, Tabloid or Arch D paper.

Along the way, the Resolution center lists missing information and plan warnings, with a recommendation for each and where to find what’s missing. Drafting checks catch overlapping annotations, broken sheet references and notes that overflow their space.

It’s worth knowing the limits before you download:

• It makes 2D plan sheets. It isn’t a 3D modeler, a BIM tool or an interior design app with furniture renderings.
• It doesn’t supply complete structural, mechanical, plumbing or other engineering calculations.
• Its drafting checks aren’t a code-compliance review. Your local permitting office decides what it needs and whether to approve, and some projects require an engineer’s stamp.

If you’re drawing plans for a permit, read the building permit drawings checklist first so you know which sheets to plan for.

A 64-bit Windows PC, an internet connection for the AI assistant, and a ChatGPT subscription. Install AI CAD PRO, open Settings, sign in with ChatGPT, and describe your first room. Not sure what to ask? Start with these ChatGPT floor plan prompts. Your projects are saved on your own computer.

Prefer to pay per use? Connect an OpenAI API key instead; those requests are billed by OpenAI. Either way, AI CAD PRO itself is free.