Part L - Conservation of fuel and power

To assist with meeting the Requirements of Part L - Conservation of fuel and power, there are a number of tools and documents available:

National Calculation Methodologies

This publication documents the approved methodologies and software programs that can be used to produce Energy Performance Certificates (EPCs), Display Energy Certificates (DECs) and Air Conditioning Inspection Reports (ACIRs).

• Notice of Approval of the methodology of calculation of the energy performance of buildings in England and Wales¹

Sustainability and Net Zero: Design Guide – Sustainability Annex

Sustainability and Net Zero: Design Guide – Sustainability Annex²

1. https://www.gov.uk/government/publications/method-for-calculating-the-energy-performance-of-buildings-notice-of-approval
2. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1080617/Sustainability___Net_Zero_Annex_-_March_2022.pdf_Document_uploaded_via_email._A_Accepted_as_Stage_Complete_1.pdf