We want your views on changes to Part L (Conservation of Fuel and Power) and Part F (Ventilation) of the Building Regulations for new dwellings.
Hoffem glywed eich barn ynghylch newidiadau i Ran L – (Arbed Tanwydd ac Ynni) a Rhan F (Awyru) o’r Rheoliadau Adeiladu ar gyfer anheddau newydd.