The building regulations in relation to staircases are laid out within “section K” of the building regulations, which can be downloaded here Here is a summary of some of the key points from the document: We Have based this on the questions that we get asked most frequently Staircases Can be categorised into one of the following three types: Private - Intended to be used for only one dwelling (domestic stair case) These must comply to the following: - A minimum going of 220mm - A maximum rise of 220mm - Pitch of no more than 42 degrees This type of stair is used in houses, loft conversions etc. and is the most commonly found type of stair case
Institutional and Assembly Stair - Serving a place where a substantial number of people will gather These must comply to the following: - A minimum going of 280mm - A maximum rise of 180mm - A minimum width of 1200mm - A handrail both sides This type of stair is used in hospitals, schools, shops etc.
Other Stair - For all other buildings These must comply to the following: - A minimum going of 250mm - A maximum rise of 190mm Used in flats and other buildings
For a house, loft conversion extension you will need a domestic stair
Other Key Points: Head room - must be at least two metres at all points from the pitch line (as shown on diagram), however can be reduced to 1.9m on loft conversions
Landings - Must be at least equal to the width of the narrowest flight at top and bottom of stair.
Width - Their is nothing in the building regulations to determine the minimum width of a private stair, however we wouldn't recommend anything less than 600mm width overall strings on a straight flight(s), however on a winder stair the width is determined by a number of factors. A "normal" or "standard" width on a main staircase is 850mm overall strings.
Winder (Tapered) Treads - must all be equal around the centre going of each tread, this going must also be no greater or no less than the minimum or maximum for this type of staircase, (as stated in section 1.3 of document K)(and described above)
Handrail - Should be set between 900 and 1000mm from the pitch line of the stair on a private stair
Doors - The bottom and top of a staircase must not fall within 400mm of the swing of a doorway.
Please Note; The above mentioned is meant as a summary only, there are many other factors that affect some regulations in regards to staircases.
If in doubt please contact us and we will be happy to help.
Headroom can be slightly lower on a loft conversion with a sloped roof
Diagram above shows how building regulations measure pitch line and headroom
Diagram above shows how building regulations measure rise & going