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Last edited 19 Apr 2017
Maximum length of a flight of stairs
Approved Document K requires that dwellings with more than 36 risers in consecutive flights of stairs, have at least one change of direction, with a landing that has a minimum length equal to the width of the stairs.
For buildings other than dwellings, the maximum number of risers between landings is 16 for utility stairs, and 12 for general access stairs (or 16 in exceptional circumstances where the plan area is restricted). There should not be any single steps.
The requirements for the rise and going of stairs are set out below:
|Min rise (mm)||Max rise (mm)||Min going (mm)||Max going (mm)|
|General access stair||150||170||250||400|
The normal relationship between the rise and the going is that 2 x the rise + the going should be between 550mm and 700mm.
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