UK Staircase Building Regulations

When adding or replacing a staircase, there’s more to think about than just looks. Misinterpreting UK staircase building regulations can lead to costly delays, safety issues, or failed inspections.

MAKING SURE YOUR STAIRCASE MEETS THE RULES

Whether you’re working on a home or a commercial property, staircase regulations in the UK are strict - and they’re not always easy to interpret. You’ll need to think about pitch, step size, handrail placement, and accessibility. If you get any of these wrong, it could mean rebuilding parts of the staircase or struggling to get sign-off from Building Control.

That’s where we come in. At Stairway Joinery, we provide professional staircase installations that meet current building regulations, along with expert advice to help you get it right from the start. We’ll make sure your staircase is safe, compliant, and ready to be signed off.

Residential Staircase Regulations

If you’re installing or upgrading a staircase in a home, it’s essential to follow UK residential staircase building regulations. These rules are designed to make staircases safe and practical for everyday use - and to avoid problems later during inspections or resale.

Residential staircase regulations are covered under Approved Document K and, in some cases, Approved Document M.

Here’s what you need to keep in mind:

Maximum Pitch: Domestic staircases must not exceed 42°.
Step Size: Riser height should be between 165–220 mm, with a going (tread depth) of at least 220 mm.
Handrails: Required if there are two or more risers. Minimum handrail height is 900 mm.
Guarding: Gaps must not allow a 100 mm sphere to pass through.
Fire Safety: Internal stairs must support safe escape, with fire-resistant materials and alarms recommended.

Following these rules helps keep your home safe - and your project compliant.

Get in Touch for Your Free Site Survey

At Stairway Joinery, our in-house design team works closely with you to create a staircase that fits your space, style, and building requirements. With over 40 years of experience across the south coast, we specialise in bespoke staircases that combine quality craftsmanship with practical design.

Every staircase is custom-built, and our joiners install on-site to guarantee a perfect fit. Most projects can be completed in as little as three weeks. If you're planning a new staircase and want expert advice from start to finish, get in touch today via our website or call us on 01202 622826.

Commercial Staircase Regulations

If you’re working on a commercial property, the staircase building regulations are more detailed and demanding than in residential projects. This is due to the higher volume of foot traffic, public access, and emergency evacuation needs.

Commercial staircases must meet the requirements of Approved Documents K, M, and B, covering safety from falls, accessibility, and fire protection. Here’s what you need to know:

Maximum Pitch: Commercial staircases typically require a shallower pitch than 42° to allow safer use by larger groups of people.
Step Size: Steps must have wider treads and consistent rise and going, with anti-slip surfaces where needed.
Handrails: Handrails are required on both sides, must be continuous, and designed to support both able-bodied and disabled users.
Guarding: Balustrades must meet strict height and load-bearing requirements, with spacing that prevents falls and supports high foot traffic.
Fire Safety: Staircases must provide direct fire exits, include fire-resistant materials, and support safe evacuation in emergencies.
Glass Balustrades: Glass should bear the Kite Mark logo indicating compliance with standards like BS EN 12150 for toughened glass or BS EN 14449 for laminated glass. This also applies to residential installations.

Failing to meet these standards can delay approval and impact safety.