Approved Document O (Overheating) 2022 edition took effect on 23 November 2022, and provides guidance for reducing overheating risk in new residential buildings.
Daeth Dogfen Gymeradwy O (rhifyn 2022) i rym ar 23 Tachwedd 2022, ac mae'n darparu canllawiau ar gyfer lleihau'r risg o orboethi mewn adeiladau preswyl newydd.