Approved Document B (Fire safety) Volume 1 Dwellinghouses (2006 edition incorporating 2010, 2016 and 2020 amendments) Part B, Schedule 1 31 December 2020
Dogfen Gymeradwy B (Diogelwch tân) Cyfrol 1 Tai annedd (argraffiad 2006 sy'n ymgorffori diwygiadau 2010, 2016 a 2020)