When people discuss accessible toilets, the conversation almost always centres around height.
Questions such as:
* Is it a comfort height toilet?
* Is it 460mm high?
* Is it suitable for elderly users?
are asked every day.
While toilet height is certainly important, it is often not the most critical factor when it comes to accessibility.
For many wheelchair users, toilet projection can have a much greater influence on whether a transfer is safe, comfortable and independent.
Understanding the difference could help you choose the right toilet for your home, care facility or commercial project.
A Doc M compliant toilet projects approximately 750mm from the rear wall, compared with around 650mm for the many comfort height toilets. That additional 100mm can significantly improve wheelchair transfers and user support.
Toilet projection refers to how far the toilet pan extends from the wall into the room.
In simple terms, it is the overall front-to-back length of the toilet.
A typical comfort height toilet may project around 650mm from the wall.
A fully compliant Doc M wheelchair-accessible toilet typically projects around 750mm.
That additional 100mm may not sound significant, but in practice it can make a substantial difference.
The primary purpose of increased toilet height is to reduce the distance a person has to lower themselves when sitting.
This can benefit:
* Elderly users
* People with reduced leg strength
* Users with arthritis
* People recovering from surgery
A higher toilet can reduce strain on the knees and hips.
However, height alone does not automatically make a toilet wheelchair friendly.
For wheelchair users, transferring onto a toilet is often performed from the side rather than directly from the front. A lower projection provides greater support beneath the thighs and can make transfers safer and more comfortable.
For wheelchair users, transferring onto a toilet is often performed from the side rather than from directly in front.
This is known as a side transfer.
In many situations, the user positions their wheelchair alongside the toilet and moves across using arm strength, support rails or transfer techniques.
A longer projection provides:
* More seating area beneath the user
* Better support during transfer
* Improved body positioning
* Reduced risk of slipping forward
* Greater stability once seated
This is one of the reasons why Approved Document M toilets typically use a projection of approximately 750mm.
Many domestic comfort height toilets have a projection of around 650mm.
Although the seat height may appear suitable, the shorter pan can create difficulties for wheelchair users.
Potential issues include:
* Less support beneath the thighs
* Reduced seating stability
* More difficult side transfers
* Increased reliance on carers
* Greater risk of awkward positioning
In some cases, a toilet may technically be higher but actually be harder to use.
The dimensions contained within Approved Document M were not chosen by accident.
The recommended 750mm projection is intended to assist wheelchair users during transfer and use.
The longer pan works together with:
* Transfer spaces
* Drop-down support rails
* Back support
* Correct wheelchair positioning
The toilet forms part of a complete accessible layout rather than being viewed in isolation.
Imagine two toilets positioned side by side.
Toilet A
* Height: 500mm
* Projection: 650mm
Toilet B
* Height: 460mm
* Projection: 750mm
Many people would assume Toilet A is more accessible because it is higher.
However, for a wheelchair user performing a side transfer, Toilet B may actually provide a much safer and more comfortable transfer because of its longer projection and increased support area.
This illustrates why accessibility involves far more than simply increasing seat height.
The most accessible toilet is rarely the highest toilet available.
Instead, accessibility is achieved by balancing:
* Appropriate seat height
* Adequate projection
* Correct support rails
* Suitable transfer space
* Good overall room layout
Each element contributes to the user’s independence and safety.
When selecting an accessible toilet, it is easy to focus solely on seat height because it is often the first specification listed in product brochures.
However, toilet projection may be just as important—if not more important—for many wheelchair users.
A longer projection can significantly improve side transfers, stability and overall usability.
That is why many wheelchair-accessible and Doc M compliant toilets use a projection of around 750mm rather than the shorter projections commonly found on standard domestic models.
Understanding this difference can help ensure that a toilet is not only comfortable to sit on, but genuinely accessible to use.
About the Author
Malcolm has more than 35 years of experience within the bathroom, plumbing and accessibility sectors. He has worked with manufacturers, distributors, installers, local authorities and healthcare professionals, helping to specify practical bathroom solutions for domestic, healthcare and commercial environments. His focus is on making accessible bathrooms easier to understand and easier to get right.