New 2010 Building Regulations Part L

Technical Brief - Part L Regulations – 2010 Revisions

Part L Regulations 2006 is being superceeded and the proposed key revisions are:

• Acceptable Air Tightness target remains at 10m³/h.m² at 50 Pascals;
• 25% Carbon Emissions improvement required over 2006 Part L Regulations – assessed on a flat approach for dwellings and aggregate approach for non-dwellings;
• CO₂ Emission calculations (BER and TER) to be submitted to the Local Authority prior to start;
• Increased sample size of dwellings to be tested (up to 50% within a dwelling type);
• Clearer definitions of dwelling type;
• Additional measures for dwellings within a “type” that have not been subjected to testing;
• The acceptance of temporary sealing for all natural ventilation devices, refer to Part F;
• ATTMA TSL1 & TSL2 documents referenced for testing dwellings and non-dwellings respectively;
• BINDT registration with respect to air tightness testing remains the only route of competence referenced in the Approved Documents.