Welcome to Lambert & Foster

Lambert and Foster are pleased to now be able to offer Building Efficient testing and assessment services, we provide Airtightness Testing, SAP and EPC’s to comply with part L1A of the Building Regulations, water efficiency calculation to comply with Part G of the Building Regulations and Air testing, SAP and EPC’s for existing properties (please call to discuss).

We offer a bespoke service to suit all individuals and companies alike, from providing advice and guidance throughout the build to working on a very short notice if required.

Our Services

Lambert & Foster Building Efficiency

Air Testing

Air leakage is the uncontrolled flow of air through gaps and cracks in the envelope fabric of a building.

Lambert & Foster Building Efficiency

Existing Properties

Testing existing properties is not mandatory but does give homeowners peace of mind.

Lambert & Foster Building Efficiency


An Energy Performance Certificate or EPC is a certificate which provides data to show the energy rating of a building. This is produced by using the SAP Methodology, by an On Construction Domestic Energy Assessor.

Lambert & Foster Building Efficiency

New Properties

In order to gain approval for Building Reg Part L1A you will be required to undergo an air tightness test.

Lambert & Foster Building Efficiency


The SAP calculation measures the CO2 emissions and energy efficiency of a residential unit.

Lambert & Foster Building Efficiency

Water Efficiency

Building reg G2 stipulates that a reasonable provision must be adopted when the installation of fittings and fixed appliances must now provide water efficient methods to prevent over- consumption of water.