The Higher-Risk Buildings (Descriptions and Supplementary Provisions) Regulations 2023

Storeys

6.—(1) Subject to paragraph (2), when determining the number of storeys a building has the following is to be ignored—

(a) any storey which is below ground level;

(b) any storey which is a roof-top machinery or roof-top plant area or consists exclusively of roof-top machinery or roof-top plant rooms; and

(c) any storey consisting of a gallery with an internal floor area that is less than 50% of the internal floor area of the largest storey vertically above or below it which is not below ground level.

(2) Where a section is a building pursuant to regulation 4(2) or (4), any storey directly beneath the building which is not below ground level is to be counted in determining the number of storeys the building has.

(3) A storey is treated as below ground level if any part of the finished surface of the ceiling of the storey is below the ground level immediately adjacent to that part of the building.