The building safety regime applies to all buildings but has a special focus on 'higher-risk buildings' (HRBs).
Broadly speaking, HRBs are defined under s.65 and s.120D of the Building Safety Act 2022 as buildings in England that are at least 18m (or seven storeys) high and contain at least two residential units. However, the exact definition and exclusions depend on the building's phase.
During the design and build phase, exclusions (Reg 7, Higher-Risk Buildings (Descriptions and Supplementary Provisions) Regulations 2023) include secure residential institutions, hotels and military premises, while care homes and hospitals which meet the height/storey criteria and which contain at least two residential units are caught by the definition of HRBs.
During the occupation phase, exclusions (Reg 8, Higher-Risk Buildings (Descriptions and Supplementary Provisions) Regulations 2023) include secure residential institutions, care homes, hospitals, hotels and military premises, regardless of the number of residential units.
For height measurement details and specific criteria/exclusions per phase, refer to the Regulations and the Guidance.