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The short answer
An accessible toilet in New Zealand must be at least 1600 mm wide and 1900 mm long.
That minimum comes from NZS 4121:2001 Design for Access and Mobility – Buildings and Associated Facilities, the standard used to show compliance with Building Code clause G1 Personal Hygiene. Seat height, pan position, grab rails, door width and basin location all have set measurements too, and they are covered below.
Room size is only part of it. Getting any one measurement wrong, such as a door that swings inwards or a rail fixed out of reach, can make the room unusable for a wheelchair user. This guide covers each requirement for both public buildings and home bathrooms.
It affects a lot of people. The 2023 Household Disability Survey from Stats NZ found 17 percent of people living in New Zealand households were disabled, which is about 851,000 people. For adults aged 65 and over, the rate was 35 percent.
The plan below shows a minimum-size accessible toilet drawn to scale, with the key NZS 4121 measurements marked.
| What | NZ requirement |
|---|---|
| Room size | 1600 x 1900 mm minimum, can be larger |
| Manoeuvring space | 1500 mm diameter kept clear |
| Toilet seat height | 460 mm to top of seat |
| Front of pan to back wall | 700–750 mm |
| Pan centreline to side wall | 450 mm |
| Transfer space beside pan | 800 mm on the open side |
| Grab rail | L-shaped, 750 mm legs, horizontal leg at 700 mm |
| Grab rail vertical leg | 150–250 mm in front of the pan |
| Door | 760 mm minimum clear opening |
| Basin | At least 300 mm from the pan |
| Soap, dryer, dispensers | 900–1200 mm above floor |
Sources: NZS 4121:2001 and Acceptable Solution G1/AS1.
Three documents set the requirements for accessible toilets in New Zealand:
Using a larger toilet pan?
MBIE guidance allows a larger compartment to be designed using AS 1428.1:2009, with a backrest and a right-angle grab rail. It is treated as an alternative solution, so it needs sign-off from your Building Consent Authority (BCA).
The minimum accessible toilet compartment is 1900 mm by 1600 mm. NZS 4121 treats these as minimums: the room can be larger, and should be if extra fittings are added. For example, a nappy-changing table needs extra floor area so it doesn’t block the manoeuvring space.
Inside the room, the layout works around four measurements:
A standard adult manual wheelchair is roughly 600–700 mm wide, and a power chair or bariatric chair is wider and longer. That is why the transfer space and manoeuvring space matter more than the overall room size. See our guide to the normal width of a wheelchair for measurements by chair type.
NZS 4121 sets the top of the toilet seat at 460 mm above the floor. At this height, most wheelchair users can transfer across at close to level, and it reduces strain on knees and hips for ambulant users.
The front of the pan must be 700–750 mm from the back wall. If a longer pan is used, the room has to be longer to keep the clearances in front of it. Where the design uses a larger pan under AS 1428.1, a backrest is required. Our toilet backrest support for accessible toilets is designed for this use.
If the toilet has a wall-hung pan or a concealed cistern, G1/AS1 requires the wall in front of the cistern to extend at least 1.0 m above the floor for back support. A fold-up lid must also be fitted.
NZS 4121 specifies an L-shaped grab rail on the wall beside the toilet:
For compartments designed under AS 1428.1, MBIE guidance specifies a right-angle grab rail. The 45-degree angled rail is not used in New Zealand for this layout.
The door needs a minimum clear opening of 760 mm. Clear opening is measured from the face of the open door to the opposite door stop, not the width of the door leaf.
Hinged doors must swing outwards, unless the room is large enough to keep a 1500 mm turning circle clear of the door swing. An outward-opening door can also be opened if someone falls against it inside the room. Sliding doors are also acceptable. Where there is a lobby, 1200 mm of clear space is needed between door swings.
Where a shower is included, NZS 4121 sets a 1200 mm x 1200 mm wet area with no lip, plus grab rails and a shower rose on a slide rail. Walls under 1800 mm high around a shower must be strong enough to resist the impact of a falling person and to carry grab rails.
G1/AS1 requires that there is no direct line of sight from an access route to a toilet, urinal, shower or bath during normal use of the building. This applies to accessible toilets in the same way as other facilities.
| Need | Product |
|---|---|
| L-shaped rail beside the toilet | L-shaped corner grab rail |
| Support on the open side at home | Drop-down fold-away toilet grab rail |
| Back support for a larger pan | Toilet backrest support |
| Raising a low toilet at home | Toilet seat raiser with flip-up armrests or over-toilet commode chair |
| Basin for seated and standing users | Powered lifting sink |
| Level entry to an existing shower | Shower ramps |
See the full range of toilet grab rails and accessible bathroom products. For a public or commercial facility, check drop-down rails with your BCA.
NZS 4121 is written for buildings and associated facilities, but its measurements are a useful benchmark for a home bathroom. At home, the layout should suit the person using it. An occupational therapist can assess transfer method, chair size and carer access, and recommend measurements to match.
Government-funded housing modifications are delivered through Enable New Zealand, including for ACC clients. Examples of what may be funded include grab rails, a transfer bench and a level-access shower. The process works like this:
Check before you pay. If you arrange and pay for modifications yourself first, you generally can’t claim the cost back later.
For smaller changes, see our guide to bathroom safety modifications.
Installing a long pan in a minimum-size room, which cuts into the space in front of the toilet.
Fixing the grab rail at the wrong height or too far from the pan, so it can’t be reached from a seated position.
Fitting a hinged door that swings inwards in a room without a clear 1500 mm turning circle.
Placing bins, a vanity or a nappy-changing table in the transfer space beside the toilet.
Fixing grab rails to plasterboard without structural backing.
The minimum is 1600 mm wide by 1900 mm long, under NZS 4121:2001. The room can be larger, and must be if extra fittings or a longer pan are added.
The top of the toilet seat should be 460 mm above the floor, and the front of the pan 700–750 mm from the back wall.
NZS 4121 specifies an L-shaped rail with 750 mm legs. The horizontal leg is fixed at 700 mm above the floor, and the vertical leg is 150–250 mm in front of the pan.
The door needs at least 760 mm of clear opening. Hinged doors should swing outwards unless the room has a 1500 mm turning circle clear of the door swing.
NZS 4121 is written for buildings and associated facilities. For a home, it is a sound benchmark, but the layout should be set for the person using it, ideally after an occupational therapist assessment. Any building work that needs consent still goes through your BCA.
Send us your room measurements and who will be using the space. We’ll help you choose the right grab rails, seat raisers, backrests and commodes for the layout.
Send your measurementsSources
Standards New Zealand, NZS 4121:2001 Design for Access and Mobility – Buildings and Associated Facilities
MBIE: Accessible showers and toilets
MBIE: Toilets, privacy and access for people with disabilities
Whaikaha: Level access showers
Stats NZ, Household Disability Survey 2023 (published February 2025)
