Protection from falling, collision and impact: Approved Document K

O N L I N E V E R S I O N K1 Stairs and ladders See paras 1.25–1.27 Stair width less than 1m 50mm minimum tread Equal Equal width at narrow end Measure going at centre of tread; measure from curved stair line, even when tread is in rectangular closure Going (not more Stair width than maximum 1m or more for stair category see para 1.3) Width Going (not less than minimum for stair category see para 1.3) Landing length measured on centre line 270mm 270mm Diagram 1.9 Measuring tapered treads Spiral and helical stairs 1.28 Design spiral stairs and helical stairs in accordance with BS 5395-2. Alternating tread stairs in dwellings 1.29 You may use alternating tread stairs – in one or more straight flights – only in a loft conversion, and only when there is not enough space for a stair that satisfies paragraphs 1.2–1.24, and the stair is for access to only one habitable room and, if desired, a bathroom and/or a WC (although this must not be the only WC in the dwelling). 12 Approved Documentttt KKKK,,,, 2222000011113333 eeeeddddiiiittttiiiioooonnnn Building Regulations 2010 OOO NNN LLL III NNN EEE VVV EEE RRR SSS III OOO NNN