Code and standard reference
UK Building Regulations Part K Stairs
Last reviewed · BuildMath editorial team
Approved Document K lists a maximum 220 mm rise, minimum 220 mm going, and maximum 42-degree pitch for private stairs, with separate rules for other stair categories, headroom, landings, handrails, and guarding. These values are a navigation aid only: use the current official document and the requirements adopted for the project location.
Limit table
| Item | Limit or rule | Reference | Verification note |
|---|---|---|---|
| Private stair rise | Maximum 220 mm | Table 1.1 | Other stair categories use different limits. |
| Private stair going | Minimum 220 mm | Table 1.1 | Measure in accordance with the document diagrams. |
| Private stair pitch | Maximum 42° | Table 1.1 | Rise and going must also comply. |
| Headroom | Normally 2.0 m | Section 1.10 | Loft conversions have illustrated alternatives. |
| Landings | Level and generally at least stair width | Section 1.20 onward | Door swing and obstruction rules apply. |
How to use this code summary
- Confirm which code edition and local amendment applies to the project address.
- Measure the actual completed geometry, not only rough framing or nominal dimensions.
- Compare the calculator output with every relevant row and exception in the primary source.
- Escalate structural, accessibility, egress, guard, and fall-protection questions to the authority or qualified professional.
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Frequently asked questions
Is this the complete code text?
No. This is a focused planning summary with a direct primary-source link. Definitions, exceptions, local amendments, and adjacent sections can change how a limit applies.
Which edition should I use?
Use the edition adopted by the authority having jurisdiction for the project address, including local amendments.
Can the calculator certify compliance?
No. It can flag a value against a displayed planning limit, but approval belongs to the authority, designer, or qualified professional.
Why is the source linked?
The source link lets readers and answer engines distinguish a cited rule from an unsupported numerical claim.
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