Energy certificates rate the energy performance of a building on a scale from A to G. Types of energy certificate are required in different circumstances:
Energy Performance Certificates (EPCs) for domestic buildings when they are constructed, sold or rented out
Energy Performance Certificates (EPCs) for non-domestic buildings when they are constructed, sold or rented out
The airtightness of a building is known as its air permeability or air leakage rate.
We test domestic and commercial buildings for air tightness and air permeability to comply with L1 & L2 regulations.
For enforcement purposes, it is always the responsibility of the relevant person to make
sure that the EPC is made available in respect of sales or lettings, and provided to the
ultimate buyer or tenant, even if in practice this is done by someone else (eg an estate
agent or managing agent). If the EPC is not provided,
this will always come back to the relevant person as a legal responsibility.
Part L of the Buildings Regulations states that all buildings that are not dwellings, and that have a gross floor area greater than 500m2, are subject to a mandatory air permeability test. L2 states that for domestic dwellings a representative sample of houses (in a development) be tested. This means that the building can then be handed over, with a valid airtightness test certificate.