Experienced assessors and accurate measurement makes SAP work for you
Approved Document Part L1B is used to assess compliance of extensions, refurbishments and change of use developments.
Extensions or conservatories with large areas of glass more than 25% of the extended floor area will require SAP calculations to show compliance with Part L1B.
When making changes to domestic building all the new-build elements of the building must meet the latest regulations and other retained elements may also need thermal improvements.
Building services such as the heating, lighting, building fabric and hot water systems may need to be upgraded or changed to meet current standards.
A thorough understanding of the SAP regulations for extensions and renovations, and early engagement will ensure that the right building fabric and solutions are selected to keep your costs to a minimum.
Get in touch or send an email if you need advice on SAP or are looking for an accredited assessor to help you: and one of the team will respond within 24 hours.