A practical guide to height, projection, transfer space and choosing the right toilet for the right user.
Many people assume that a comfort height toilet and a Doc M toilet are essentially the same product. After all, both are designed to make toilet use easier and both are often recommended for people with reduced mobility.
However, while they may appear similar at first glance, they are designed for very different purposes.
Understanding the difference can help homeowners, occupational therapists, contractors and specifiers choose the most appropriate solution for a particular user.
Caption: Although the comfort height toilet is taller (500mm versus 480mm), the Doc M toilet projects 100mm further into the room. This additional projection can make a significant difference when transferring from a wheelchair.
| Feature | Doc M Toilet | Comfort Height Toilet |
| Typical Height | 480mm | 500mm |
| Projection from Wall | 750mm | 650mm |
| Primary Purpose | Accessibility and wheelchair transfer | Easier sitting and standing |
| Wheelchair Transfer Friendly | Yes | Limited |
| Support Rails Required | Yes, as part of the accessible layout | No |
| Approved Document M Compliant | Yes | No |
| Typical Installation | Accessible bathrooms, healthcare settings and DFG adaptations | Domestic bathrooms and cloakrooms |
| Best For | Wheelchair users and assisted transfers | Users who simply require a higher toilet |
A comfort height toilet is designed primarily to make sitting down and standing up easier.
Most standard domestic toilets have a pan height of approximately 400-430mm. Comfort height models are typically between 470mm and 500mm high, reducing the distance users need to lower themselves when sitting and making it easier to stand afterwards.
This can be particularly beneficial for:
Comfort height toilets generally retain a domestic appearance and fit comfortably into most residential bathrooms.
A Doc M toilet forms part of a wider accessible toilet layout designed to support users with more significant mobility needs.
While height is important, the toilet itself is only one element of an accessible washroom.
A typical Doc M installation includes:
Most importantly, the toilet projects approximately 750mm from the wall, allowing users to position themselves more effectively during wheelchair transfers.
This longer projection is one of the key differences between a Doc M toilet and many comfort height models.
One of the most common misconceptions is that the highest toilet is automatically the most accessible.
In reality, accessibility involves much more than seat height alone.
Looking at the dimensions above, many people are surprised to discover that the Doc M toilet is actually lower than the comfort height model.
However, the additional 100mm of projection provides a larger seating platform and improves access during side transfers.
For wheelchair users, projection and surrounding transfer space are often more important than a few millimetres of additional height.
[Insert wheelchair transfer layout drawing here]
The transfer space shown above is a fundamental element of accessible bathroom design. Without adequate transfer space, even a taller toilet may not provide the accessibility benefits many users require.
Caption: The extra 100mm makes a difference
When transferring from a wheelchair, users typically need sufficient toilet projection to allow safe positioning and movement.
A toilet with a longer projection can:
This is one of the reasons why many occupational therapists and accessibility professionals consider projection alongside height when assessing suitability.
The answer depends entirely on the user’s needs.
A comfort height toilet may be the ideal choice where:
A Doc M toilet may be more appropriate where:
The best solution is always the one that matches the user’s current and anticipated requirements.
A comfort height toilet and a Doc M toilet may look similar, but they are designed to solve different problems.
Comfort height toilets focus on reducing the effort required to sit down and stand up.
Doc M toilets focus on accessibility, transfer space and supporting users with more complex mobility needs.
The dimensional drawings highlight an important point: the comfort height toilet is taller, but the Doc M toilet is longer.
For many users, that additional projection can make a far greater difference to accessibility than height alone.
Choosing the right toilet therefore involves considering the whole user experience, not simply measuring the distance from the floor to the seat.
Malcolm has over 35 years of experience within the bathroom and accessibility sector, advising on accessible sanitary ware, mobility adaptations, Doc M compliance and healthcare washroom solutions. Having worked with local authorities, occupational therapists, contractors and end users, he is passionate about helping people create safer, more practical and more dignified bathroom environments.