Do I need building regs or planning permission to replace a staircase?
Written by Scott Jones, The Stair Guys, independent staircase measuring and sourcing specialists·Last updated
This is one of the most common questions about a staircase, and the answer is usually simpler than people fear. The line that matters is whether you are replacing the stair as it is, or changing it. That single distinction decides whether building control is involved. This is general guidance, not legal advice, and building control can confirm your specific case.
Like-for-like: usually no
Taking out a staircase and putting a new one back in the same place, to the same layout, is generally treated as a repair or replacement rather than a controlled alteration. In that case you usually do not need building regulations approval, and you almost never need planning permission, because it is internal work. Good practice is to build the new stair to current standards anyway, but a straight swap is the low-fuss case.
Changing it: usually yes
The moment you change the stair rather than just replace it, you are likely into a material alteration, which does need building control. The usual triggers are: changing the rise or going, changing the width, moving the staircase to a different position, changing a straight flight to winders or the other way round, or opening up or moving the stairwell opening in the floor above. Any of those can affect how the stair performs on safety, headroom or fire, which is exactly what building control checks.
Two things people worry about
"My existing stairs do not meet current regs." That is usually fine, because building regulations are not retrospective. A stair built to the standards of its day is legal even if it would not be allowed today, and you are not obliged to bring it up to date unless and until you alter it. It is only when you do controlled work that the current standards apply.
"Will it be a problem when I sell?" A like-for-like older stair is not illegal, but if you have done alteration work that should have had building control and did not, a buyer's solicitor may ask for the completion certificate. That is the practical reason to get controlled work signed off at the time rather than discover the gap at sale. For how the sign-off works, see Building Control approval for a new or replacement stair.
Frequently asked
Do I need building regulations to replace a staircase?+
Generally not if it is a like-for-like replacement in the same position, which is treated as a repair rather than controlled work. But if you change the rise, going, width or position, swap between a straight flight and winders, or alter the stairwell opening, it becomes a material alteration that does need building control approval. If in doubt, building control can confirm before you start.
Do I need planning permission to change my stairs?+
Almost never for an internal staircase, because it is internal work rather than a change to the outside of the building. The main exception is a listed building, where replacing or altering a staircase can require listed building consent, so you should check with your local conservation officer first.
My stairs do not meet current regulations. Is that a problem?+
Usually not, because building regulations are not retrospective. A staircase built to the standards of its time stays legal even if it would not meet today's rules, and you do not have to upgrade it unless you carry out controlled alteration work. It only has to meet current standards when you alter it.
Ready when you are.
Free and no obligation. The Stair Guys survey the real space, never off a plan.