Gridsnap draws a new metric door at 900 mm wide × 2100 mm high, or a new imperial door at 36″ × 6′-8″. Select the door to edit its opening, height, leaf, frame and variant in the properties panel. The width is the structural opening in the wall, not the swinging leaf or the clear passage through the frame.
For the architectural size chart, regional conventions and opening-versus-leaf explanation, read the Standard door sizes guide. This page documents what the Gridsnap editor creates, lets you change and checks.
What Gridsnap uses
| Constant | Value |
|---|---|
| Default width | 900 mm |
| Default height (opening top above floor) | 2100 mm |
| Leaf thickness in plan | 40 mm |
| Frame (jamb) depth across the wall | 92 mm |
| Frame post along the wall | 30 mm, stepping to 40 mm past the rebate |
Every one of these is editable per door in the properties panel. Select a door and the panel shows Width (300–6000 mm — a 6 m opening is a full-width sliding glass wall or a double garage door), Height (500–3000 mm), Leaf (20–100 mm) and Frame depth (40–500 mm, clamped to the wall).
Switch the drawing to feet-inches and new doors are created at the US standard instead — 36″ × 6’-8” with a 1¾″ leaf — as real inch sizes, not conversions of the metric ones.
Door variants
The Variant dropdown offers nine, and they are what the plan symbol, the elevations and the 3D model all draw from:
| Variant | What it is |
|---|---|
| Single | One hinged leaf with a swing arc |
| Double | Two leaves meeting in the middle |
| Sliding | A leaf on a track across the wall face |
| Sliding (in wall) | A pocket door — the leaf disappears into the wall |
| Sliding (double) | Two panels on parallel tracks, bypassing each other |
| Bifold | Leaves hinged to each other that fold back against one jamb |
| Double-acting | One leaf on spring hinges that swings both ways — it reserves floor on both sides |
| Garage | An overhead sectional door that opens upward |
| Opening (no door) | A cased opening: the wall is cut through, no leaf, no swing |
A cased opening is still a door as far as the plan is concerned — it counts as a way between rooms in the plan check, so circulation still routes through it.
Sliding and pocket doors need no swing space, which is the reason to reach for them: a 900 mm pocket door in a small bathroom buys back most of a square metre. What they cost is wall — a pocket door needs a clear stud bay at least as long as the leaf, with no sockets, pipes or return walls in it.
Leave enough wall beside the opening
The one door-size rule Gridsnap does enforce is the wall left at the jamb.
door-jamb (Pro) flags an opening that leaves between 5 mm and 50 mm of
host wall beside it — a strip too thin to build the frame and its architrave
into. Hanging a door hard against a return wall is ordinary practice and stays
silent; a 30 mm sliver of wall is a drafting accident.
The rule also catches a door whose opening runs into a wall junction, and a door sitting so close to a return that the frame and trim collide.
What this doesn’t do
- There is no minimum door width rule. A 500 mm bedroom door passes the plan check without a word. The sizes above are conventions Gridsnap draws with, not limits it enforces.
- Nothing checks accessibility. Clear widths, approach space at the latch side, threshold heights and door opening forces are all outside what Gridsnap models.
- Frames are drawn, not scheduled by product. Gridsnap knows a frame’s depth and post section; it does not know a manufacturer’s door set, its fire rating or its handing convention.