Building Regulations Part L1A, L1B, L2A and L2B: Conservation of fuel and power
Welcome to the technical guidance page for Part L of the Building Regulations.
This section contains the approved documents for download below. This suite of documents covers 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.