Private Staircase– for a domestic property.
Institutional & Assembly Stairs– are for serving a place where a substantial number of people will gather.(Public Staircase).
Other – are defined as offices, disabled, factories and common stairsserving morethan one dwelling. (Semi Public Staircase).
For the actual stair & staircase building regulation for this issue go to Point 1.2 (Page 6) atBuilding Regulations Part K.
The Rise And Going.
The most important regulation regarding domestic staircases is that:
1.Maximum rise of staircase 220mm.
2.Minimum going of staircase 220mm.
Private Staircase (Domestic) Max Rise = 220mm, min going 220mm.
Institutional & Assembly Max Rise = 180mm, min going 280mm.
Other (Semi Public) Max Rise =190mm, min going 250mm.
2. The maximum pitch of a domestic property is 42°
Private Staircase(Domestic) = 42° Maximum.
Institutional & Assembly Stairs (Public) = 33° Maximum.
Other (Semi Public) = 38° Maximum.
Please Note –that your stair tread cannot be too long or the riser too short because building regulation salsostate:
Twice the rise plus the going (2R+G) should be between 550mm and 700mm. For the actual stair & staircase building regulation regarding categoriesforsteepness of stairs go to 1.3; 1.4; 1.5; & 1.6 (Page 6) atBuilding Regulations Part K
Construction of Steps.
Building regulations stipulate that staircase steps should be level. Nosings should be at least 16mm.
For the actual stair & staircase building regulation regarding construction of steps go to point 1.8 (Page 6) atBuilding Regulations Part K.
All stairs which have open risers should be constructed so that a 100mm sphere cannot pass through.
This regulation has been stipulated by the government in order that children’s heads cannot get stuck in any opening. For the actual stair & staircase building regulation regarding Open risers go to point 1.9 (Page 6) atBuilding Regulations Part K.
A headroom of 2m is required at all points on and off a staircase and as you pass down a staircase.
For the actual stair and staircase building regulation regarding Headroom go to point 1.10 (Page 7)Building Regulations Part K.
Headroom for Loft Conversions.
For loft conversions the headroom will pass the building regulations if the centre of the stair width is 1.9m reducing to 1.8m at the side of the stair.
Please Note – Where there are real difficulties in the height some building control officers will allow you to build a newel out from the wall to meet the regulations. This does make the staircase narrower but this may be the only option.
For the actual stair and staircase building regulation regarding Headroom go to point 1.10 (Page 7) at Building Regulations Part K.
MINIMUM WIDTH OF STAIRCASE.
There are no recommendations as to the width of a staircase – Yes Really!
There are rules for direct fire escapes and disabled access and you will have to consult Part M of the building regulations Building Regulations Part Mand talk to your building control officer who can interpret these rules differently.
However Pear Stairs recommend: To make a staircase visually pleasing and comfortable we would recommend that you don’t try to have a staircase narrower than 860mm overall string.
For the actual stair and staircase building regulation regarding minimum width of staircase go to point 1.11 (Page 7) at Building Regulations Part K.
MAXIMUM WIDTH OF STAIRCASE.
The maximum width of a public staircase is 1800mm. However this is easily overcome by putting an additional handrail, newel and spindles in the staircase.