Amendments Booklet AMD 7 2022 (Booklets B C E)·Page 19·5.4G
Material Change of Use - External Wall Requirements
Where a building's use changes such that it becomes a building described in Regulation 23(4), the construction of external walls and specified attachments must be investigated and, where necessary, work must be carried out to ensure they only contain materials achieving European Class A2-s1, d0 or Class A1.
Regulation 8 provides that, where the use of a building is changed such that the building becomes a building described in Regulation 23(4), the construction of the external walls, and specified attachments must be investigated and where necessary work must be carried out to ensure they only contain materials achieving European Class A2-s1, d0 or Class A1, other than those exempted by Regulation 23(3).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Amendments Booklet AMD 7 - 2022 (Booklets B C E).pdf