Building Regulations

Guides in this hub

• UK Staircase Building Regulations, Explained

  The building regulations for stairs in England, Wales, Scotland and Northern Ireland, in plain English. Rise, going, pitch, headroom, guarding and handrails, every figure sourced.

• Staircase headroom: how much you need and how to check it

  How much headroom a staircase needs under UK building regulations: the 2 metre rule, the reduced loft-conversion allowance, where headroom is tightest, and how to check it properly.

• Staircase handrail requirements: height, sides and grip

  What UK building regulations require of a staircase handrail: the 900mm to 1000mm height, when you need one side or both, and why a wall-mounted rail needs proper clearance and grip.

• Staircase guarding and balustrade: height and the 100mm rule

  What UK building regulations require of staircase guarding and balustrade: where it is needed, the 900mm height, the 100mm sphere gap rule, and why it must not be easy for a child to climb.

• Private staircase dimensions: rise, going and pitch

  The rise, going and pitch rules for a private (domestic) staircase in the UK, the 2R+G formula, why every rise must be equal, and the simple going = rise divided by 0.9 rule of thumb that keeps a stair within 42 degrees.

• Staircase building regulations: Northern Ireland

  The staircase building regulations for Northern Ireland under Technical Booklet H (2012): rise, going, pitch, risers per flight, width, headroom, handrails and guarding, and how they differ from England, Wales and Scotland.

• Staircase building regulations: Scotland

  The staircase building standards for Scotland under the Domestic Technical Handbook, Section 4: rise, going, pitch, risers, width, headroom, handrails and guarding, and the figures that differ from England, Wales and Northern Ireland.

• Staircase building regulations: Wales

  How the staircase building regulations for Wales work: the geometry mirrors England's Approved Document K, but the big difference is accessibility, because Wales never adopted England's M4(2) and M4(3) optional standards.

• Do wooden stairs need to be fire rated in a house?

  In an ordinary two-storey house, Building Regulations set no fire rating for the staircase timber itself. A fire-protected stairway is only triggered when a floor sits more than 4.5m above ground, which usually means a third storey or a loft conversion.

• A worked example of a compliant staircase (England)

  A compliant England private staircase can be, for example, 13 risers at 200mm rise with a 250mm going, giving a 38.7 degree pitch and 2R plus G of 650mm, all inside Approved Document K. Here it is drawn out and tabled.

• General access and utility staircase regulations

  Not every staircase is a "private" stair. Approved Document K sets shallower, stricter rules for general access and utility stairs, so a domestic stair drawn into a shared or public building is non-compliant, not just tight. Here are the figures and when each applies.

• A worked example of a compliant staircase (Scotland)

  A compliant Scottish private staircase can be, for example, 13 risers at 200mm rise with a 240mm going, giving a 39.8 degree pitch, all inside the Domestic Technical Handbook. Note the Scottish figures differ from England: 225mm minimum going and a 16-riser cap per flight.

• Staircase accessibility: Approved Document M and the M4 categories (England)

  How Approved Document M treats staircases in English dwellings: the M4(1), M4(2) and M4(3) categories, the optional 850mm stair-width rule for a future stairlift, and why this M4 system is England-only.

• A worked example of a compliant general access (commercial) staircase

  A compliant general access staircase, for a shared or public building rather than a home, is shallower than a domestic one: for example a 165mm rise with a 275mm going, giving a 31 degree pitch. A flight is capped at 12 risers, so a full storey height usually has to be split with a landing.

• A worked example of a compliant staircase (Wales)

  Wales uses its own Approved Document K, and for private-stair geometry it follows the same figures as England, so a compliant example is 13 risers at 200mm rise with a 250mm going, a 38.7 degree pitch and 2R plus G of 650mm. Where Wales differs is accessibility: it did not adopt the M4 categories England uses.

• A worked example of a compliant staircase (Northern Ireland)

  Northern Ireland uses Technical Booklet H, not Approved Document K. A compliant private example is 13 risers at 200mm rise with a 240mm going, giving a 39.8 degree pitch. The key NI points are a 16-riser cap per flight and a 220mm minimum going.