For people with disabilities the minimum tread size is 27 5 cm 11 inches which would be the effective minimum and likely the average size of the tread for any stairs built for public use.
Step tread size uk.
According to standards the maximum height of stairs may not exceed 200 mm.
The height and width of the steps.
Headroom for loft conversions.
The rise and going tread dimensions of a formal flight of stairs should be constant.
All other buildings must have stair treads that are at least 250 mm 9 8 inches deep.
Alternating tread stairs should.
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.
The inside tread dimension.
Stair details refer to the standard requirements for each of the various components of a flight of stairs.
Harvard university lists typical tread sizes between 20 and 28 7 cm 8 and 11 1 2 inches.
The building regulations also state that the tread should be a minimum of 50mm tread width at the narrow end.
S and standard value in a private house taking 90 110 cm if space is limited a width of the opening sause the minimum critical value 80 cm.
Usually 15 17 cm optimal width of a step 27 30 cm.
Or use the handy chart below with the ratios already figured for you.
This control is mainly directed at disabled access to the main entrance but there is always a legal obligation to design safely.
The size and shape of outdoor steps in new buildings is governed by the local building regulations.
When it comes to other materials the thickness may differ.
This is because stair treads can be crafted from thick oak to think stainless steel.
The width of the opening of the stairs.
You ll find the tread width in the column on the left and the rise height in the column on the right.
There isn t one unifying rule for every kind of material stair treads may be built out of.
Make alternating steps uniform with parallel nosings have slip resistant surfaces on treads have tread sizes over the wider part of the step in line with the table above should provide a minimum clear headroom of 2 m should be constructed so that a 100 mm diameter sphere cannot pass through the open risers.
Institutional buildings and places of assembly must have a going of at least 280 mm 11 inches on their stairs.
Regulated by building codes stair details specify the sizes of risers and treads stair widths the placement of handrails and guardrails and construction methods for fabricating stairs.
Find the right tread and riser for your situation by pluging your measurements into this formula.
Other uk staircase building regulations.
An unexpected difference of.
The uk building regulations states that stair treads must have a minimum depth of 220 mm 8 66 inches for a private house.
Doors should not open more than 400mm onto the front of any step.
