Written question WQ90508

Part L of the Building Regulations are the means by which we regulate for minimum energy efficiency standards in new buildings, and we have recently made a significant and necessary step change in energy and carbon performance in non-domestic buildings (Part L 2022), which introduced a 28% reduction in carbon emissions for new buildings (compared with the previous Part L standard).

Part L of the Building Regulations is in general, technology and fuel neutral so we do not prescribe or prohibit any particular form of heating or energy generation, the intention being flexibility in meeting energy targets so as not to act as a barrier to innovation. The current building regulation energy efficiency requirements (Part L 2022) do not, therefore, mandate a particular technology (such as solar PV), however, the notional building specification which sets the energy target does include solar PV. This in turn would then encourage the use of renewable energy in new buildings.

The Welsh Government has extensive permitted development rights to support renewable energy schemes on non-domestic (commercial) properties, including the installation of solar, wind, and air, ground and water source heat pumps. Under permitted development rights there is no limit to the number of solar panels that can be placed on the roof of a non-domestic building subject to the criteria listed in Part 43 Class A of the Town and Country (General Permitted Development) Order 1995 (as amended). Criteria includes limitations on location, design and impact on amenity. These permitted development rights ensure businesses and other organisations have flexibility in the renewable energy choices they make.