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Floor Plan Symbols Explained
Updated 2 June 2026 6 min read
What do the symbols on a floor plan mean?
Floor plan symbols are standardised marks for building features: thick lines for walls, a quarter-circle arc for a door swing, a thin break for a window, parallel lines with an arrow for stairs, and outlines for fixtures like baths, sinks and kitchen units. They let anyone read a plan consistently.
Walls, doors and windows
These define the structure and openings of a plan.
- Walls — solid lines, thicker for external walls
- Doors — a line with a quarter-circle swing arc
- Windows — a thin break in the wall, often parallel lines
- Openings — gaps in walls with no door
Stairs and structure
Vertical circulation and structure have their own conventions.
- Stairs — parallel lines (treads) with an “up” arrow
- Columns — small solid squares or circles
- Level changes — a line with a label
Fixtures and fittings
Plans show fixed items so rooms make sense.
- Kitchen — units, sink, hob and appliances
- Bathroom — bath, basin, WC and shower
- Storage — wardrobes and cupboards as outlined boxes
- Bedrooms — sometimes a bed outline for orientation
Frequently asked questions
There are widely used conventions, so most plans read consistently, though styles can vary by drafter and country. A clear plan includes a key where needed.
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