Reference — architectural standards

A bedroom wants at least 7 m² and 2.0 m of clear width, a living room 10 m² and 2.4 m, a kitchen 4.5 m² and 1.7 m, a bathroom 2.0 m² and 1.2 m. Gridsnap flags a room under those on the Pro plan check.

Gridsnap starts with 400 mm Outer, 250 mm Bearing and 120 mm Inner wall presets; edit them for one wall, one project or future plans.

Gridsnap draws a 900 × 2100 mm metric door or a 36″ × 6′-8″ imperial door by default; edit its opening, leaf, frame and variant in the properties panel.

A standard window sill sits 900 mm above the floor with the head at 2100 mm, giving 1200 mm of glass height. Gridsnap draws 1200 mm wide by default and raises the sill to 1400 mm in wet rooms.

A hinged door needs a quarter-circle of clear floor its own width in radius, plus about 800 mm of walk-up on the other side. Gridsnap's Pro plan check flags furniture in either zone and two doors swinging into each other.

A corridor wants 900 mm minimum and 1000–1200 mm to be comfortable. Gridsnap's route check guarantees a 600 mm walkable path to every door, use-face and stair foot, and flags a named hall narrower than 900 mm.

The rule of thumb is glazing of at least one eighth of the floor area — a 16 m² bedroom wants 2 m² of window. Gridsnap's Pro plan check measures it per room and flags anything under.

Sink, stove and fridge should form a triangle with no leg longer than 2.7 m and the three legs adding up to no more than 7.9 m. Gridsnap's Pro plan check measures it and flags a stretched one.

1050 mm is the minimum aisle between two facing kitchen runs and 1200 mm is what two cooks need. Gridsnap's Pro plan check flags a galley or island aisle under 1050 mm.

A toilet needs 600 mm clear in front and 400 mm from its centreline to anything either side; a basin 600 mm in front; a shower 600 mm and a bath 700 mm to step out into. Gridsnap's Pro plan check tests the toilet and the basin.

Leave 700 mm from the table edge to a wall to pull a chair out, 900 mm where someone also walks behind the seated diners, and 600 mm of table edge per person. Gridsnap's plan check does not test this — the layout engine does.