Wales Part L: Conservation of fuel and power
Welcome to the Welsh Technical Guidance page for Part L of the building regulations.
This section contains the Approved Documents L1A and L1B for download below. They cover new dwellings (document L1A), work to existing dwellings (L1B), new buildings other than dwellings (L2A), and works to existing buildings other than dwellings (L2B). There are two additional compliance guides for building services, and additional guidance below.
BCA Technical Guidance Note 6: Use of multi-foil insulation products and compliance with Regulation 7 and Building Regulation Requirement L1
BCA Technical Guidance Note 12: Cavity Separating Wall Guidance for Part L 2010