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Part L 2010

As of 1st October 2010, the guidance to Part L of the Building Regulations (relating to the conservation of fuel and power) has changed.

Below is a summary of the key points:

• The worst acceptable air tightness remains at 10m³/h.m² at 50 pascals, although considerably more onerous carbon emissions targets must be achieved.

• There is a 25% carbon emissions improvement, calculated using SAP 2009, required over 2006 Building Regulations. This is assessed on a flat approach for dwellings, and aggregate approach for non-dwellings.

• As designed CO₂ emission calculations (BER and TER) are to be submitted to the Local Authority prior to work commencing on site.

• An increased sample size of dwellings are to be tested, up to 50% within a dwelling type.

• A revised definition of dwelling type provides greater clarity.

• There are additional measures for dwellings within a "type" that have not been subjected to testing.

• Domestic conservatories and extensions have amended guidance in respect of exemptions from energy efficiency requirements

.

• Secondary heating is included as part of the CO₂ emission rate for completed dwellings.

• There is revised guidance for avoiding thermal bridging.

• The guidance for renovation of a thermal element has been expanded.

• Swimming pools are now included to limit heat loss from a swimming pool.

• There is amended guidance for historic and traditional buildings in respect of enerfy efficiency exemptions.

• The insulatiing of roof spaces to commercial buildings is now controlled, even if this is the only work being undertaken.

• Revised guidance is provided for shell and core developments and first fit-out.

• There iis a revised procedure for reasonable provision to limit solar gain.

• A quality assuerd system can be adopted to limit thermal bridging.

• Key features are provided for guidance to demonstrate compliance with energy efficiency requirements to achieve the annual CO₂ emission rate.

• The acceptance of temporary sealing for all natural ventilation devices is referred to Part F.

• ATTMA TSL1 and TSL2 documents are 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.

This webpage was updated on 12/23/2010

 

 

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