Staircases are covered by Approved Document K. I have not included details concerning winding stairs, spiral stairs or tread stairs (for details on these constructions refer to the document). On normal staircases Approved Document K dictates the following requirements (Fig. 22.1):
is allowed in loft conversions; see Diagram 3 of Approved Document K for details.)
(c) Twice the rise plus once the going should add up to 550-700mm (maximum rise 220mm, minimum going 220mm).