This Factfile has been extensively revised and updated to reflect the latest changes to Part L of the Building Regulations in England, Scotland and Northern Ireland. Please note that Wales is now devolved in terms of building regulations. The performance requirements for lighting are the same in the English, Scottish and Welsh versions but the requirements for Northern Ireland have yet to be updated.
The aim of this Factfile is to inform lighting professionals of the implications and recommendations of Part L. Actual compliance is now measured against the latest approved documents, which include the 2011, 2013 and 2016 amendments. These approved documents take many forms and are seen as minimal acceptable practice. Other methods of proving compliance are acceptable provided they can be demonstrated.
The Society of Light and Lighting believes that whilst the Building Regulations provide statutory minimum performance for lighting efficiency they do not harness the maximum possible energy reduction by the use of mandatory lighting controls. By far the best method for proving compliance for the conservation of fuel and power would be to use the internationally recognised standard BSEN 15193: 2007: Energy performance in buildings, which details a measure called the ‘lighting energy numeric indicator’ (LENI).
Revised and updated by Nick Howard
This is one of the Society of Light and Lighting's series of freely available factfiles, all of which are available here: