Building Regulations Part L2b (Wales) Explained
Part L2b highlights the energy efficiency requirements of existing commercial/non-domestic buildings.
This provides guidance for non-domestic building extensions, conversion and material changes of use.
Part L2b, Extension Compliance
Larger commercial extensions need to follow the guidance set out in Part L2a of the Building Regulations and should be regarded as a new building.
Compliance for smaller commercial extensions can be achieved if the new thermal elements introduced with the extension meet or better the standards laid out in Part L2b.
SBEM Calculations can be undertaken to offer greater design flexibility with extensions, as elements of the design can be relaxed and compensated for elsewhere.
Part L2b, Material Change of Use/Conversion Compliance
When part of a building which was previously unheated becomes a space which is heated/cooled a change in energy status occurs, and thus a change in energy efficiency requirements. This also occurs when a building's purpose or use changes.
SBEM Calculations can be used to achieve compliance in these scenarios by measuring the energy performance of the converted building. The software can also produce an Energy Performance Certificate (EPC) required for sale or let.
Calculations for Extensions and Conversions