The plan check runs while you draw — “Plan check — placement and circulation rules”. Findings appear in a panel, grouped and dismissable, and clicking one selects what it is about so you can see the problem rather than hunt for it.
The mechanical rules are free. The expert set is Pro.
Free — the things that cannot be built
These are drafting errors, not opinions, so they are on every plan:
- Furniture overlap and Furniture in a wall.
- Openings cut into each other — two openings overlapping in one wall.
- A wall runs into an opening.
- Split levels overlap, and a split level runs outside the building.
- A façade window could not be placed — a window in a row along a wall that would straddle a seam or a junction, reported rather than forced.
With nothing else wrong you get: “No issues in the basic checks — overlaps and walls all clear.”
The construction checks
These watch the floors, stairs and guarding, and they are free too. Every one of them reports; none of them repairs.
| Finding | What it catches |
|---|---|
| The walls enclose no floor | Walls that close nothing, so there is no floor to build. |
| A floor no longer follows the walls | An automatic floor whose walls stopped closing. It kept its last outline. |
| Two floors overlap at one level | Two floors built in the same place. |
| The floor model found a conflict | A split the floor model cannot resolve — usually two parts claiming one area. |
| A wall runs up into the floor above | A wall with its own height ending inside the slab over it. |
| A ceiling lining has lost what it hung on | An attached ceiling whose floor or roof is gone. |
| A stair has no floor to arrive on | A stair with nothing above it; it is drawn on placeholder risers. |
| A stair’s rise does not match the storey above | A stair carrying the rise it had before stairs knew their destination. |
| A stair arrives on nothing | A flight landing where there is no floor. |
| A stair runs into a floor or a ceiling | A flight inside construction it has no opening through. |
| Headroom over a stair | Something closer over a tread than the Stair headroom setting in the ⚙ dialog — 2000 mm unless you change it. |
| A floor opening cuts nothing | A hole whose hosts are gone. |
| A door opens over a step | A door onto a drop — see split levels. |
| A floor edge stands over a fall | An unguarded edge over a drop — see guarding. |
| Guarding has lost what it followed | The floor, split level or opening a run belonged to is gone. |
Pro — the things you find out by living in them
| Finding | What it catches |
|---|---|
| Door access issue / Window access issue | Something blocking a door or a window. |
| Door swing conflict | Two doors fighting over the same air. |
| Door beside a wall return | A door with no room for its jamb. |
| Circulation problem | Somewhere you cannot get to. |
| Room size below minimum | Against the minimum room sizes. |
| Clearance issue | Bathroom fixtures and storage fronts without room to use them. |
| Kitchen work-triangle issue and Kitchen practice issue | See the kitchen work triangle. |
| Bed access issue and Bed placement issue | A bed you cannot walk round, or one under a window. |
| TV placement issue | Glare from the window opposite. |
| Room without a window and Low daylight ratio | See the 1/8 daylight rule. |
| Heat pump split distance | The outdoor unit too far from the indoor one. |
Working through findings
- Fix appears on findings the editor can resolve itself: “Fix it automatically — the change is checked against every rule before it’s applied”. Nothing is applied that would break something else.
- Explain writes a short architect’s note on why the finding matters. It is part of Pro and costs one AI credit — see Explain & Fix.
- Dismiss — I know, it’s fine takes a finding out of the list, and Restore this finding brings it back.
Scale figures are skipped by every rule: a figure is placed exactly where the rules complain, and it is a ruler rather than furniture.
What this doesn’t do
- It is not a building-code check. The numbers behind the rules are common residential practice, documented on the reference pages, not the code of any one country.
- It does not check structure, services or fire. No spans, no drainage, no escape distances.
- It cannot see intent. Dismiss what you meant.
Next
Explain & Fix for the assistant’s half, and the reference pages for the standards the rules are built on.