Wales · answered by Verika · verified against sources
What do the Welsh building regulations say about materials and workmanship?
Materials must be suitable, of adequate quality, and properly applied/used/fixed to perform intended functions (Reg 7(1)(a)) [8]. Workmanship must be workmanlike (Reg 7(1)(b)) [8]. For buildings ≥18m with dwellings/institutions/residential rooms, external walls/specified attachments must use Class A2-s1,d0 or A1 materials (BS EN 13501-1:2018) [7][8], excluding listed exemptions [8]. Materials include manufactured/natural products and backfill [4]. Workmanship adequacy can be shown via CE marking, BS 8000 standards (e.g., BS 8000-3 for masonry, BS 8000-2-2 for concrete), independent certification, quality management (ISO 9000), past experience, or tests [2][6].
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