What are the current recommendations for the rise and going of stairs?

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2 Approved Document M: Access to and use of buildings
3 BS 5395-1:2000: Code of practice for the design, construction and maintenance of straight stairs and winders
4 BS 5395-1:2010: Code of practice for the design of stairs with straight flights and winders. 1 – Approved Document K  Clauses 1.3, 1.4 and 1.5 (Usual method)

Notes to table:
1 The maximum pitch of a private stair is 42° this means that with a rise of 220mm the going must be at least 244mm.
2 For the maximum rise for stairs providing the means of  access for disabled people reference should be made to Approved Document M (see below)
3 If the area of a floor of the building is less than 100m2, the going may be reduced to 250mm The normal relationship between the dimensions of the rise and the going is that twice the rise plus the going (2R+G) should be between 550mm and 700mm. Clause 1.7 Alternative Method The requirements for steepness of stairs can be met by following the relevant recommendations in BS 5395-1:1977. Notes: (a) AD K acknowledges that BS 5395-1:1977 is withdrawn and is superseded by BS 5395-1:2000. (b) It is also acceptable to refer to the latest version of the code of practice which is BS 5395-1:2010.

2 – Approved Document M

Notes: (a) There are no recommendations for Part M compliant stairs in dwellings.
 
(b) There are no recommendations for Part M compliant stairs within the common areas of blocks of flats where a lift is provided. Section 3: horizontal and vertical circulation within buildings other than dwellings Clause 3.51 internal stairs – provisions

3 – BS 5395-1:2000
Stairs, ladders and walkways. Code of practice for the design of straight stairs.

Clause 7.5, comfortable gait A comfortable gait on stairs is expected for most people if the relationship between the dimensions of the rise and the going is that twice the rise plus the going (2R+G) is between 550mm and 700mm.
4 – BS 5395-1:2010
Code of practice for the design of stairs with straight flights and winders

Note: There is no criterion on pitch or comfortable gait (2R+G) in this version of the code of practice.