Stair Nosing Building Regulations: The UK Compliance Guide
Almost everything written about stair nosing compliance blurs three different things together: what the law requires, what the Approved Documents offer as guidance, and what a British Standard recommends. They are not the same, and on a specification the difference decides whether a decision is defensible.
This hub separates them.
The short version
A defensible specification for a stair in a building other than a dwelling reads:
- A 55mm × 55mm contrasting band across tread and riser
- In a colour clearing 30 points of Light Reflectance Value against the tread
- Achieving at least 36 PTV wet on the pendulum test
- Projecting no more than 25mm over the tread below
Everything below explains where each number comes from and how binding it is.
What is actually law
Workplace (Health, Safety and Welfare) Regulations 1992, regulation 12
This is the duty that bites hardest, and the one most often left out of stair nosing discussions. It requires that every floor and traffic route in a workplace is of suitable construction, and in particular is not slippery so as to expose any person to a risk to their health or safety.
Two things follow. It applies to the stair as it is today, not as it was when built — a compliant stair that has worn smooth is no longer compliant. And it is not discharged by having installed a product, but by the surface actually performing. That is why in-situ pendulum testing matters on a stair where risk has been assessed.
The Building Regulations
Binding where you are building new or carrying out a material alteration. The Approved Documents below are the practical guidance on how to satisfy them — following the guidance is not the only way to comply, but departing from it puts the burden of proof on you.
What is guidance
Approved Document K — stair geometry
Part K covers protection from falling, collision and impact. For stairs that means geometry: going, rise, and how far a nosing may project over the tread below, for which 25mm is the figure to work to.
Part K is routinely and wrongly cited as the source of visual contrast requirements. It is not. Read the detail on Part K.
Approved Document M — access and use
Part M is where the contrast requirement actually lives. It is the source of the 55mm × 55mm contrasting band across the tread and riser, and it applies to buildings other than dwellings.
If you take one dimension away from this hub, take that one. Read the detail on Part M.
What is a standard, not law
BS 8300-2:2018
A British Standard referenced by Part M, but not legislation in itself. It defines adequate visual contrast as a difference of at least 30 points of Light Reflectance Value between the nosing and the surrounding tread.
Two colours that look clearly different to the eye can measure very close, so ask suppliers for the LRV figure rather than judging by sight. Check a combination with our LRV calculator, or read the detail on contrast.
BS 7976 / BS EN 16165 and DIN 51130
The two slip-resistance test methods. They measure different things and do not convert into one another — a single R10 rating can span pendulum results from 20 to 60. Only the pendulum is recognised by the HSE. Read the detail on slip testing.
What the Equality Act does and does not do
The Equality Act 2010 creates a duty to make reasonable adjustments so that disabled people are not put at a substantial disadvantage. It does not specify stair nosings, dimensions or colours.
It also replaced the Disability Discrimination Act, which is why "DDA compliant" is trade shorthand rather than a current legal test. The term is still universally used in the industry, including in our own product titles, but if someone tells you a nosing is required because of the DDA, they are working from a repealed statute.
New build, alteration, or existing stair?
What applies depends on what you are doing:
- New build — the Building Regulations apply in full. Specify to Part K and Part M from the outset.
- Material alteration — the Regulations apply to the work, and the building must be no worse afterwards than before.
- Existing stair, no building work — the Building Regulations are not triggered, but regulation 12 and the Equality Act duty still apply to how the stair performs in use. This is the case most people are actually in, and it is why retrofit nosings are the largest part of the market.
Specifying against this
Ask a supplier for three figures and treat vaguer answers with caution: the wet PTV, the LRV of the nosing, and the profile dimensions. "Compliant" on its own is not an answer, because it does not say compliant with what.
For product selection, start with the full stair nosing range, or the DDA and accessibility range for profiles dimensioned to the Part M band. For specification end to end, see the complete guide to stair nosings.
Frequently asked questions
Are stair nosings a legal requirement in the UK?
Not as a standalone product requirement. What binds is regulation 12 of the Workplace Regulations 1992, and the Building Regulations where you are building or materially altering. Approved Document M sets the 55mm contrasting band for non-domestic buildings. A nosing is the usual way of satisfying those obligations, not a separate obligation in itself.
Does Part K require contrasting stair nosings?
No. Part K covers stair geometry — going, rise and nosing projection. The contrast requirement comes from Part M, with BS 8300-2:2018 supplying the 30-LRV figure. This is the single most common error in stair nosing specification.
What does "DDA compliant" mean?
It is industry shorthand, not a legal standard. The Disability Discrimination Act was replaced by the Equality Act 2010. In practice what applies is Approved Document M plus the Equality Act duty to make reasonable adjustments.
Do the regulations apply to my existing stairs?
The Building Regulations are triggered by building work, so an untouched existing stair is outside them. But regulation 12 of the Workplace Regulations applies continuously to any workplace floor, and the Equality Act duty applies to service providers. An old stair that has worn slippery is a live problem regardless of when it was built.
What PTV do I need?
At least 36 in the wet, the HSE benchmark for low slip potential, and 65 or above where oil, grease or food waste is likely. Dry figures are close to meaningless because almost every surface passes dry.
Do domestic stairs need to comply?
Part M applies to buildings other than dwellings, so the 55mm contrasting band is not a domestic requirement. Part K geometry still applies to new domestic stairs. Communal areas of flats are treated differently from the dwellings themselves — check the scope for your project.
For specification advice on a live project, call 01282 270 010.