Three worked examples
These are the kinds of prompts TinyGrid is built and tested against. Each first message draws a whole plan; each follow-up is a targeted edit that leaves the rest of the plan alone.
A ranch house from one sentence
3-bedroom ranch, 1,400 sq ft, open kitchen
A full plan drawn as a proposal over the canvas: a closed loop of exterior walls sized so the enclosed area lands close to 1,400 sq ft, interior walls for three bedrooms and a bathroom, an open kitchen and living area, a door into every enclosed room, windows on the exterior rooms, and a label on each room. A short note says what was drawn and any assumption made.
make the primary bedroom bigger and add an ensuite
TinyGrid edits only what you asked about: it moves the walls around that bedroom and adds the ensuite's walls, door, and fixtures, keeping the rest of the plan as it was.
A studio apartment
Studio apartment, about 450 sq ft, bathroom in one corner.
One open room with the bathroom walled off in a corner, a toilet and sink in the bathroom, a front door, and windows on the outside walls.
Add a window on the north wall near the east end.
One new window on the north wall. Nothing else moves.
A metric flat
One-bedroom flat, 10 m by 8 m, bathroom next to the bedroom, kitchen along the north wall.
A 10 m by 8 m outline with a bedroom, a bathroom beside it, and a kitchen along the north wall, shown in metres if your plan is set to metric.
Move the front door to the south wall.
The front door comes off its current wall and goes on the south wall at the same width.
AI drafts are a starting point, not a survey. Check the dimensions against your own measurements and adjust walls by hand where they differ.
Open the editor, find "Describe your home" in the sidebar, and type your first prompt.
Open TinyGrid →How the proposal workflow works
The AI never changes your drawing on its own.
- You describe or ask for a change. TinyGrid sends your message and the current plan to the drafting service.
- The result appears as a proposal. It is drawn as a ghost layer over your canvas. Your actual drawing is untouched, and nothing is saved to your plan or your projects, including cloud projects.
- You choose Apply or Discard. Apply makes the proposal your drawing. Discard throws it away and leaves your plan exactly as it was.
- Apply is undoable. Applying goes through the normal undo history, so Ctrl+Z takes you back to the plan you had before.
Because each turn sends the current plan, you can mix the two freely: let the AI draft, fix a wall by hand, then ask the AI for the next change.
Limits, stated plainly
- Free: 10 AI turns, lifetime. You need a free account to use the AI, but no card. One message is one turn. Your 10 turns do not reset.
- TinyGrid AI: 300 turns a month for $9/month or $69/year. Turns reset on the 1st of each month.
- Drawing by hand is always free, with or without AI turns left.
- Speed: a full plan can take up to a minute; small edits take a few seconds.
See TinyGrid pricing for everything else each plan includes.
What it cannot do
- Only floor plans. It declines anything unrelated to drawing or editing a plan.
- Only 2D plans. No 3D views, elevations, or renders.
- A fixed set of elements. Walls (exterior, interior, reference), doors, double doors, windows, stairs, toilets, sinks, tubs, showers, counters, closets, and labelled rooms. It does not place furniture or appliances.
- Straight walls. Walls are straight segments and are kept square unless you ask for angles. Curved walls are not supported.
- Text in, not images. It works from what you type, not from photos or scanned blueprints. Messages can be up to 2,000 characters.
- Size limits. Plans stay within 500 ft on a side and 400 elements in total. Larger plans should be split into layers.
- Short memory. It sees the current plan plus your last few messages, not the whole conversation.
- Approximate areas. When you give a square footage it aims close to it, not exactly. It does not check building codes.
How this differs from TinyGrid MCP
TinyGrid has two AI features, and they do different jobs:
- Chat-to-draw (this page) lives inside the TinyGrid editor. It draws and edits your plan, works on the drawing open in front of you, and every account gets 10 free turns.
- TinyGrid MCP connects outside assistants such as Claude, ChatGPT, or Cursor to your saved cloud projects. It is read-only: the assistant can answer questions about your plans, such as room sizes and total square footage, but cannot change them. MCP requires TinyGrid AI.
Want a head start without AI? Open a free floor plan template, or read about plans for apartments, renovations, real estate listings, and contractors.