English
Get the app

Braillito Maps · Accessibility guides

Disabled toilet dimensions in the UK: the Doc M toilet, measured

In England, the accessible toilet most people call a Doc M toilet is the wheelchair-accessible unisex toilet of Approved Document M, Volume 2: a room at least 1500 mm wide and 2200 mm deep, with the WC in a corner and its centre line 500 mm from the wall beside it (Approved Document M, Volume 2, 5.10(i) and Diagram 18). Around that room the document sets the support rails, including a drop-down rail 320 mm from the centre line of the WC, the heights of the fittings, and the cubicles for ambulant disabled people in separate-sex washrooms. These are the dimensions, each with its paragraph or diagram, and what to check before you buy a Doc M pack.

This is a summary of Approved Document M, Volume 2, for England. The official document is the reference; this guide is not legal advice.

What a Doc M toilet is, and when the rules apply

Approved Document M is the government guidance on access to and use of buildings under the Building Regulations 2010. Volume 2 covers buildings other than dwellings, and it is for use in England (Approved Document M, Volume 2, cover). Its section 5 deals with toilets, and “Doc M toilet” is the everyday name for the room it describes for wheelchair users: a self-contained unisex toilet, preferred because a partner or carer of a different sex can go in to help (Approved Document M, Volume 2, 5.5). It comes in addition to any wheelchair-accessible cubicle in the men’s or women’s washrooms, and it should not be used for baby changing (Approved Document M, Volume 2, 5.5).

The requirements apply when a non-domestic building is newly built, when an existing one is extended or undergoes a material alteration, and when a building changes use to a hotel or boarding house, institution, public building or shop (Approved Document M, Volume 2, 0.1). An approved document is guidance for common situations: there is no obligation to adopt any particular solution in it if the requirement is met in some other way (Approved Document M, Volume 2, Use of guidance). And regardless of the Building Regulations, service providers and employers have obligations under the Equality Act 2010 to consider the barriers that physical features of a building create (Approved Document M, Volume 2, 0.1); what that Act says is in Accessibility laws.

The United States works with a different standard, in inches, with its own layout. If that is the country you need, the US rules are in ADA bathroom requirements. This page stays with the UK document.

Room size: 1500 by 2200 mm

  • Minimum size: 1500 mm wide and 2200 mm deep, not counting any heat emitter that projects from the wall (Approved Document M, Volume 2, 5.10(i) and Diagram 18).
  • Turning space: a 1500 by 1500 mm wheelchair turning space inside the room (Approved Document M, Volume 2, Diagram 18).
  • When it is the only toilet in the building: the width goes from 1.5 m to 2 m, and the room includes a standing-height washbasin as well as the finger rinse basin by the WC (Approved Document M, Volume 2, 5.10(e) and 5.7(a)).
  • Door: preferably opening outwards, with a horizontal closing bar fixed to the inside face (Approved Document M, Volume 2, 5.10(g)). It has a light-action privacy bolt and an emergency release so it can be opened outwards from outside; if it is self-closing, it opens with a force at the leading edge of no more than 30 N from closed to 30°, and no more than 22.5 N from 30° to 60° (Approved Document M, Volume 2, 5.4(d) and (e)).
  • Where it goes: one as close as possible to the entrance or waiting area, on a direct accessible route without obstructions (Approved Document M, Volume 2, 5.10(a) and (f)). A wheelchair user should not have to travel more than 40 m on the same floor, unless the building control body agrees a greater distance because the circulation route is unobstructed, for example with doors on hold-open devices; or more than 40 m of combined horizontal distance when the toilet is on another floor reached by a passenger lift; with a lifting platform, it is at most one storey away (Approved Document M, Volume 2, 5.10(h)).
  • Left or right: in a building with several floors, the toilets sit in a similar position on each floor and alternate right-hand and left-hand transfer; where a single-storey building has more than one, there is a choice of both layouts (Approved Document M, Volume 2, 5.10(c) and (d)).

Diagram 18 draws the room for a right-hand transfer to the WC (Approved Document M, Volume 2, Diagram 18, note). A person who moves sideways from the chair to the seat usually has one side that works better, which is why the document asks for both versions in buildings with more than one toilet.

Where the WC goes: 500 mm from the side wall

The WC sits in a corner. Its centre line is 500 mm from the wall beside it, and between that centre line and the opposite wall there are at least 1000 mm: the transfer space, where a wheelchair pulls up alongside the WC. The front of the pan is 750 mm from the rear wall (Approved Document M, Volume 2, Diagram 18). The transfer space has to be kept clear all the way to the back wall (Approved Document M, Volume 2, 5.8), and a radiator may not reduce it, nor the turning space (Approved Document M, Volume 2, 5.10(p)).

Diagram 19 draws the seat 480 mm above the floor, with a note that the height depends on the manufacturing tolerance of the pan (Approved Document M, Volume 2, Diagram 19). Some wheelchair users find a standard seat height difficult, so the pan has to take a variable-height toilet seat riser: it follows the key dimensions of BS EN 997:2012 (Approved Document M, Volume 2, 5.9 and 5.10(q)).

The flush goes on the open side, the transfer side, whichever way round the room is built (Approved Document M, Volume 2, 5.10(r)). A lever on the wall side cannot be reached by someone who has just moved across from the chair.

Grab rails and drop-down rails: 320 mm and 400 mm

Many people need a horizontal rail to hold while they transfer. On the open side, the rail is a drop-down rail, which folds out of the way of the wheelchair. On the wall side, the document allows two arrangements (Approved Document M, Volume 2, 5.8):

Support rails beside the WC in a wheelchair-accessible unisex toilet, Approved Document M, Volume 2.
Rail What the document sets Source
Wall side, rail set further from the wall a wall-mounted horizontal rail whose centre line is 400 mm from the centre line of the WC, with no extra drop-down rail Approved Document M, Volume 2, 5.10(k)
Wall side, rail at the minimum spacing from the wall the wall rail, plus an extra drop-down rail on the wall side, 320 mm from the centre line of the WC Approved Document M, Volume 2, 5.10(j)
Open side a drop-down rail, drawn 320 mm from the centre line of the WC Approved Document M, Volume 2, 5.8 and Diagram 18
Height horizontal grab rails 680 mm above the floor; drop-down rails at the same height as the other horizontal grab rails Approved Document M, Volume 2, Diagram 19

The reason for the two options is grip. A wall rail set further out is thought to give a more rigid handhold; a rail close to the wall does not give the same support, so a second drop-down rail is added (Approved Document M, Volume 2, 5.8). Diagram 18 also shows vertical grab rails on the wall beside the WC, on either side of the finger rinse basin, and one on the rear wall on the open side (Approved Document M, Volume 2, Diagram 18).

The fittings and the grab bars contrast visually with the walls and the floor, and the walls contrast with the floor (Approved Document M, Volume 2, 5.4(k)). A white rail on a white tiled wall is hard to find for someone with low vision.

Heights of the fittings

Heights and positions of fittings in a wheelchair-accessible unisex toilet (Diagram 19 looks towards the wall beside the WC).
Fitting Height or position Source
WC seat 480 mm above the floor, subject to the manufacturing tolerance of the pan Approved Document M, Volume 2, Diagram 19
Horizontal grab rails and drop-down rails 680 mm above the floor Approved Document M, Volume 2, Diagram 19
Finger rinse basin rim 720 to 740 mm above the floor, placed so you can wash and dry your hands while seated on the WC Approved Document M, Volume 2, Diagram 19 and 5.8
Shelf 950 mm above the floor Approved Document M, Volume 2, Diagram 19
Sanitary dispenser coin slot 750 to 1000 mm above the floor Approved Document M, Volume 2, Diagram 19
Emergency pull cord two red bangles, one 100 mm and the other 800 to 1000 mm above the floor; reachable from the WC and from the floor next to it Approved Document M, Volume 2, Diagram 19 and 5.10(o)
Taps automatic, or usable with a closed fist, for example a lever Approved Document M, Volume 2, 5.4(a)
Heat emitters screened, or with exposed surfaces kept below 43°C Approved Document M, Volume 2, 5.4(j)

The bangle near the floor is there for someone who has fallen. The alarm system confirms with a light and a sound that the call has been received, has a reset control that can be reached from the wheelchair and from the WC, and sounds different from the fire alarm (Approved Document M, Volume 2, 5.4(h)). Outside the room, the call signal is placed where the people who can help will see and hear it (Approved Document M, Volume 2, 5.10(n)).

Diagram 18 also places a mirror, clothes hooks, a disposal bin and a sanitary disposal unit in the room, without fixing heights for all of them (Approved Document M, Volume 2, Diagram 18). Paragraph 5.9 suggests considering a chemical sanitary waste disposal unit as well (Approved Document M, Volume 2, 5.9).

Ambulant and enlarged cubicles in separate-sex washrooms

Not every disabled person uses a wheelchair. People who walk with crutches or who have impaired leg movement need a cubicle with rails and a little more room, inside the ordinary men’s or women’s washroom, so they do not have to go to the unisex toilet (Approved Document M, Volume 2, 5.11). Two rules set how many there are: at least one WC cubicle for ambulant disabled people in separate-sex toilet accommodation, and, where there are four or more WC cubicles, one enlarged cubicle for people who need extra space, in addition to the ambulant one (Approved Document M, Volume 2, 5.7(c) and (d)). The enlarged cubicle is meant for parents with children, people carrying luggage and ambulant disabled people as well (Approved Document M, Volume 2, 5.12).

Ambulant and enlarged WC cubicles in Approved Document M, Volume 2.
Element Ambulant cubicle Enlarged cubicle
When at least one in separate-sex toilet accommodation (Approved Document M, Volume 2, 5.7(c)) one where there are four or more WC cubicles (Approved Document M, Volume 2, 5.7(d))
Size at least 920 mm wide and 1465 mm deep, including the activity space (Approved Document M, Volume 2, 5.14(b) and Diagram 21) 1200 mm wide, based on the ambulant cubicle (Approved Document M, Volume 2, 5.14(d))
Rails horizontal grab rails at 680 mm on both side walls (600 mm long in the plan), and vertical grab rails 600 mm long starting 800 mm above the floor (Approved Document M, Volume 2, Diagram 21) a horizontal grab bar beside the WC and a vertical grab bar on the rear wall (Approved Document M, Volume 2, 5.14(d))
Other fittings seat at 480 mm, WC centred on the rear wall, hooks at 1050 and 1685 mm, closing bar on the door at 900 mm (Approved Document M, Volume 2, Diagram 21) space for a shelf and a fold-down changing table (Approved Document M, Volume 2, 5.14(d))
Door preferably opening outwards, with a horizontal closing bar on the inside (Approved Document M, Volume 2, 5.14(c)) the document sets no separate door rule for it

The pan in an ambulant cubicle also follows BS EN 997:2012, so it takes a seat riser (Approved Document M, Volume 2, 5.14(e)). In a standard cubicle with a door that opens inwards, the door swing has to leave a 465 mm diameter column of clearance between the door, the pan and the side wall (Approved Document M, Volume 2, 5.14(a)). And where a washroom has a wheelchair-accessible cubicle, it has the same layout and fittings as the unisex toilet (Approved Document M, Volume 2, 5.14(f)).

Since the 2024 amendments, Approved Document T covers the provision of single-sex toilets in buildings other than dwellings, and Approved Document M points to it for their design (Approved Document M, Volume 2, main changes made by the 2024 amendments, 5.5 and 5.12). This guide does not summarise Approved Document T.

Changing Places toilets in larger buildings

A Changing Places toilet is a facility for people with complex and multiple impairments who may need the help of up to two assistants. It goes in addition to the wheelchair-accessible toilets, not instead of them (Approved Document M, Volume 2, 5.6), and paragraph 5.7(e) requires at least one in large buildings open to the public, from assembly buildings for 350 people or more to hospitals and crematoria (Approved Document M, Volume 2, 5.7(e)).

Approved Document M does not give the layout of a Changing Places toilet: it refers to section 18.6, Diagram 48 and Annexes F and G of BS 8300-2:2018, and to the Changing Places Consortium, for further guidance (Approved Document M, Volume 2, 5.6). The full list of buildings, the equipment and the dates are in Changing Places toilets, and the rest of Part M in Approved Document M.

What a Doc M pack includes

“Doc M pack” is the name suppliers give to a kit of fittings for this room. Approved Document M does not use the term, so what comes in the box depends on the seller. What the document does set is what the room needs, and that makes a good checklist for a pack:

What a pack cannot give you is the room itself (1500 by 2200 mm) and the position of the pan (500 mm from the side wall, 750 mm out from the rear wall) (Approved Document M, Volume 2, 5.10(i) and Diagram 18). The room also needs a door with a horizontal closing bar and an emergency assistance alarm (Approved Document M, Volume 2, 5.10(g) and (m)): check the list of contents to see whether the pack includes them. A pack can be complete and still be fitted in a room that does not work, so measure the room first.

How to check a Doc M toilet with a tape measure

If you run a café, a shop or an office, or you just want to know whether a toilet will work for you, six measurements cover most of Diagrams 18 and 19:

  1. The room. At least 1500 mm wide and 2200 mm deep (Approved Document M, Volume 2, Diagram 18).
  2. The centre line. From the wall beside the WC to the middle of the pan: 500 mm, with at least 1000 mm of clear space on the other side (Approved Document M, Volume 2, Diagram 18).
  3. The pan. Its front 750 mm from the rear wall, and the seat about 480 mm high (Approved Document M, Volume 2, Diagrams 18 and 19).
  4. The rails. The horizontal ones 680 mm high; the drop-down rail 320 mm from the centre line of the WC (Approved Document M, Volume 2, Diagram 19 and 5.10(j)).
  5. The basin. Reachable from the seat, with its rim 720 to 740 mm high (Approved Document M, Volume 2, 5.8 and Diagram 19).
  6. The alarm cord. Hanging to the floor, with a bangle 100 mm above it and another at 800 to 1000 mm (Approved Document M, Volume 2, Diagram 19).

A toilet can pass all six and still be out of reach: the entrance, the doors on the way and the distance from the entrance count too (Approved Document M, Volume 2, 5.10(a) and (h)).

How Braillito Maps records an accessible toilet

Measuring is useful for one practical thing: knowing, before you go, whether the toilet at a place will work for you. Braillito Maps is a community map that answers ten questions about each place: step-free entrance or ramp, wide doorway, accessible toilet, accessible parking, tactile paving, braille signage, braille menu, audible signals, guide dogs welcome and a quiet environment.

The toilet goes under one of them, accessible toilet. Each question is answered yes or no, or stays without data until someone knows. The score of a place is the number of yes answers out of ten, and its colour always appears next to the number, never on its own. The checklist does not ask for millimetres: it is a single yes-or-no question, so the six measurements above are a good way to decide what to answer when you add a café or a shop in the UK.

The toilet question sits next to the two that decide whether you can get to it at all: the step-free entrance or ramp, and the wide doorway. And if what a place says is wrong, it can be reported. Meet Braillito Maps.

Frequently asked questions

What are the minimum dimensions of a disabled toilet in the UK?

Under Approved Document M, Volume 2, a wheelchair-accessible unisex toilet is at least 1500 mm wide and 2200 mm deep (Approved Document M, Volume 2, 5.10(i) and Diagram 18). When it is the only toilet in the building, the width goes up to 2 m and it adds a standing-height washbasin (Approved Document M, Volume 2, 5.10(e)).

How far should a drop-down rail be from the toilet?

320 mm from the centre line of the WC (Approved Document M, Volume 2, 5.10(j) and Diagram 18). If the wall-mounted rail is set with its centre line 400 mm from the centre line of the WC, no extra drop-down rail goes on the wall side (Approved Document M, Volume 2, 5.10(k)).

What height is a Doc M toilet seat?

Diagram 19 draws it 480 mm above the floor, subject to the manufacturing tolerance of the pan, and the pan has to take a variable-height seat riser (Approved Document M, Volume 2, Diagram 19 and 5.10(q)).

How far is a Doc M toilet from the wall?

Its centre line is 500 mm from the wall beside it, with at least 1000 mm to the opposite wall for the transfer, and the front of the pan is 750 mm from the rear wall (Approved Document M, Volume 2, Diagram 18).

When do you need an enlarged toilet cubicle?

Where there are four or more WC cubicles in separate-sex toilet accommodation, one is an enlarged cubicle, in addition to the ambulant one (Approved Document M, Volume 2, 5.7(d)). It is 1200 mm wide (Approved Document M, Volume 2, 5.14(d)).

What size is an ambulant toilet cubicle?

At least 920 mm wide and 1465 mm deep, including the activity space, with grab rails on both sides (Approved Document M, Volume 2, 5.14(b) and Diagram 21).

More accessibility guides

  • Changing Places toilets: what they are, the hoist and the changing bench, which buildings in England must have one since 2021, and how to find one.
  • Approved Document M (Part M): Part M of the Building Regulations in England, volume by volume: M4(1), M4(2) and M4(3) homes, and ramps, doors, lifts and toilets in other buildings.
  • ADA bathroom requirements: toilet height and position, grab bar height, sink height, stall sizes and turning space.
  • ADA toilet height: seat height, distance from the side wall, clear floor space, flush control, toilet paper and stalls.
  • ADA grab bars: grab bar height, length, diameter and wall spacing, and where the bars go at the toilet, in the shower and at the bathtub.
  • Blue Badge parking rules: where a Blue Badge lets you park in England: yellow lines for up to 3 hours, the parking clock, disabled bays, car parks and what counts as misuse.
  • Accessibility laws by country: the ADA, the UK Equality Act, the Accessible Canada Act, Australia’s DDA and the EU rules, and what each covers.
  • ADA turning space: the 60-inch turning circle, the T-shaped turn, the 30 by 48 inch clear floor space and where the ADA asks for each.
  • Accessibility symbols: what the wheelchair symbol means, where it is required and the other access symbols.
  • All accessibility guides

Sources

Every figure in this guide comes from one of these official texts, which we read in October 2026.

  1. Approved Document M: Access to and use of buildings, Volume 2: Buildings other than dwellings, 2015 edition incorporating 2020 and 2024 amendments. Ministry of Housing, Communities and Local Government (UK), on GOV.UK, for use in England; GOV.UK page updated 1 October 2024; read October 2026.

Braillito Maps

Find places with ramps, accessible toilets or tactile paving near you in Braillito Maps

In Braillito Maps, every place answers ten questions. One is the accessible restroom: whether there is a restroom designed for people with reduced mobility. It is built by the people who need it, and every place gets a score out of ten.

Download on the App Store Meet Braillito Maps

Free · No ads · For iPhone

Already using Braillito Maps? Rate it on the App Store