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Part L
PRACTICE & STANDARDSintermediate
Definition
The section of the UK Building Regulations covering the conservation of fuel and power — in practice, the energy performance requirements for new buildings and major renovations. Part L sets maximum U-values for building fabric elements and requires minimum Energy Performance Certificate (EPC) ratings.
Example
The 2021 update to Part L increased energy efficiency requirements by approximately 31% for new homes and 27% for new commercial buildings compared to the 2013 standards — a major step toward the 2025 Future Homes Standard.