BSA · England · Free to use
Higher-risk building checker
Is it a higher-risk building under the Building Safety Act, and which height-based fire measures apply to a block of flats.
Building Safety Act 2022, SI 2023/275, and Approved Document B Volume 1 (2026)
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Ignore basements and galleries under 50% of the floor below (Reg 6).
BSA · Result
Not a higher-risk building
Below 18 m and 7 storeys.
Checks passed- 18 m or 7 storeys: Checks passed16.8 m, 6 storeysNo
- At least 2 residential units, or care home or hospital: Calculated resultYes
- Excluded description: Calculated resulthotel, secure residential, militaryNo
- Higher-risk building (design and construction): Checks passedBSA s.65, SI 2023/275No
- Sprinklers throughout: Check neededtop storey over 11 m (Vol 1 para 7.4)Required
- Floor and flat wayfinding signage: Check neededtop storey over 11 m (para 15.13)Required
- Secure information box: Check neededtop storey over 11 m (para 15.19)Required
- Second common stair: Checks passedtop storey 18 m or more (para 3.30)Not triggered
- Evacuation alert system to BS 8629: Checks passedtop storey over 18 m (para 15.17)Not triggered
- Height is measured from ground level to the top of the floor surface of the top storey, ignoring rooftop plant (Reg 5).
- The occupation regime (Reg 8) additionally excludes care homes and hospitals.
Clauses this relies on
Source edition and scope
Building Safety Act 2022, SI 2023/275, and Approved Document B Volume 1 (2026).
This is a preliminary check of the conditions shown. Confirm the edition, project circumstances and any additional requirements with your architect or building control.
A design aid, not legal advice. Checked against the Building Regulations 2010 for England; confirm with building control.