Toilet & Commode Dimensions — Standard Sizes and Clearances
Almost every sanitary ware ordering error comes down to a dimension nobody checked. These are the standard commode and water closet sizes we produce, the space a toilet actually needs around it, and the three measurements worth confirming before a container is committed.
- Standard one-piece, two-piece and wall-hung sizes
- Rough-in, clearance and minimum room dimensions
- Metric and imperial throughout
Standard water closet and commode sizes
Typical production sizes. Individual models vary, so always work from the model drawing for a live project.
| Type | Length | Width | Height |
|---|---|---|---|
| One-piece closet | 650-720 mm (26-28 in) | 360-390 mm (14-15 in) | 660-760 mm (26-30 in) |
| Two-piece closet | 650-700 mm (26-28 in) | 350-380 mm (14-15 in) | 750-790 mm (30-31 in) |
| Wall-hung closet | 480-560 mm (19-22 in) | 350-370 mm (14-15 in) | 350-400 mm (14-16 in) |
| Floor-mounted EWC | 620-680 mm (24-27 in) | 350-380 mm (14-15 in) | 400-420 mm (16-17 in) |
| Squat pan (Indian WC) | 520-580 mm (20-23 in) | 430-450 mm (17-18 in) | Set into floor |
| Seat height, standard | — | — | 390-400 mm (15-16 in) |
| Seat height, comfort | — | — | 430-480 mm (17-19 in) |
How much room a toilet needs
Clearances, not fixture sizes. These are what decide whether a WC is usable, and they are what building codes regulate.
| Clearance | Minimum | Comfortable |
|---|---|---|
| Width of the WC compartment | 760 mm (30 in) | 900 mm (36 in) |
| Centre of pan to side wall | 380 mm (15 in) | 450 mm (18 in) |
| Clear space in front of the pan | 530 mm (21 in) | 750 mm (30 in) |
| Separate WC room, total | 0.8 x 1.4 m | 0.9 x 1.5 m |
| Rough-in, wall to waste centre (S-trap) | 300 mm (12 in) | 400 mm (16 in) |
| Door swing clearance | Outward opening preferred | — |
The three measurements that cause returns
The rough-in comes first. It is the distance from the finished wall face to the centre of the waste outlet, and it is fixed by the drainage already in the slab. Order a pan built for a 300 mm rough-in into a building plumbed at 400 mm and the pan will sit 100 mm proud of the wall, which is both ugly and, in a tight compartment, unusable.
The trap direction comes second, and it is the one that genuinely cannot be worked around. An S-trap discharges downward through the floor; a P-trap discharges backward through the wall. There is no adaptor that turns one into the other cleanly, so a container of the wrong type is a container that gets sent back.
Compartment width comes third, and it is the one specifiers under-estimate. A pan is only about 370 mm wide, so a 600 mm compartment looks adequate on a drawing. In use it is not: you need roughly 380 mm from the centre of the pan to any wall on each side, which puts the practical minimum at 760 mm. Below that, the room fails inspection in most jurisdictions and is unpleasant regardless.
Frequently asked questions
What is the standard size of a commode?
A floor-standing one-piece or two-piece commode is typically 650 to 720 mm long, 350 to 390 mm wide and 660 to 790 mm tall, with the seat at 390 to 400 mm. Wall-hung pans are shorter, around 480 to 560 mm, because the cistern is concealed in the wall.
What are standard toilet dimensions?
Roughly 26 to 28 inches long by 14 to 15 inches wide, with a seat height of 15 to 16 inches for a standard pan and 17 to 19 inches for a comfort-height pan. Use the model drawing for a live project — these are production ranges, not a single figure.
What is the minimum size for a water closet room?
About 760 mm wide by 1.4 m deep is the practical minimum for a separate WC, allowing 380 mm from the centre of the pan to each side wall and 530 mm of clear space in front. Below that the compartment fails inspection in most codes.
How much room do you need for a toilet?
Allow 380 mm from the centre of the pan to any side wall — 450 mm is comfortable — and at least 530 mm of clear floor in front of the pan, ideally 750 mm. These clearances, not the size of the fixture, are what make a WC usable.
What is the rough-in dimension?
The distance from the finished wall to the centre of the waste outlet, typically 300 mm or 400 mm on an S-trap pan. It is set by the drainage already installed, so it must be measured on site before closets are ordered.
What are the dimensions of a toilet?
A standard two-piece WC is roughly 680 to 760 mm deep, 350 to 400 mm wide and 760 to 800 mm tall to the top of the cistern, with a seat height of 400 to 420 mm. Compact and short-projection pans run to about 600 mm deep for small bathrooms.
What is the standard toilet bowl size?
The bowl itself is typically 350 to 400 mm wide and 400 to 480 mm front to back, with the rim 400 to 420 mm above the finished floor. Comfort-height pans raise the rim to 430 to 480 mm, which is the accessible standard in most codes.
What is the standard size of a commode?
Commode and WC describe the same fitting, so the standard size is the same: about 680 to 760 mm deep by 350 to 400 mm wide, seat at 400 to 420 mm. Allow 200 mm clear each side of the pan and 600 mm in front of it.
Need a model drawing?
Tell us the closet type and we will send the dimensioned drawing and rough-in detail before you order.
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