What is the maximum riser height for stairs under UK Building Regulations?
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Approved Document K Table 1.1 sets a maximum rise of 220mm for private stairs in dwellings, 190mm for utility stairs and 170mm for general access stairs. The minimum rise is 150mm, and all risers in a flight must be equal.
What is the minimum going for stairs?
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Approved Document K sets a minimum going of 220mm for private stairs and 250mm for utility and general access stairs. The maximum going is 300mm for private stairs and 400mm for the others. The going is measured on the pitch line between successive nosings.
What is the 2R+G rule?
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Twice the rise plus the going should be between 550mm and 700mm for a comfortable stair. For example, a 175mm rise with a 250mm going gives 2 × 175 + 250 = 600mm.
What is the maximum pitch for a domestic stair?
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Approved Document K limits private stairs in dwellings to a maximum pitch of 42 degrees.
How much headroom does a stair need?
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Approved Document K asks for 2.0m of clear headroom measured vertically above the pitch line. Loft conversions can reduce this to 1.9m at the centre of the stair and 1.8m at the side where there isn't room for more.
When does a stair need a handrail on both sides?
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Under Approved Document K, a stair narrower than 1m needs a handrail on at least one side, and a stair 1m or wider needs one on both sides. Handrails sit 900 to 1000mm above the pitch line.