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Building Regulations Regarding Staircases:

The building regulations in relation to staircases are
laid out within “section K” of the building regulations,
which can be downloaded

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

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