Part L Compliance

About this service

What is SBEM and BRUKL Part L compliance?

SBEM (Simplified Building Energy Model) is the government-approved calculation methodology for demonstrating that a new or refurbished non-domestic building meets Part L of the Building Regulations. The BRUKL (Building Regulations UK Part L) output report is the document the calculation produces, comparing the actual building's CO2 emissions, fabric performance and primary energy use against a notional reference building. Both are required by Approved Document L Volume 2: Buildings other than dwellings (2021 edition, in force from June 2022).

A BRUKL is needed at design stage for building control sign-off, and again as-built before practical completion to confirm what was actually constructed matches the design. It applies to all new commercial buildings, most extensions over 100 m², and refurbishments where thermal elements, controlled fittings or building services are replaced. The as-built BRUKL feeds directly into the new-build EPC, so the same SBEM model usually produces both outputs.

The deliverable is the BRUKL PDF, the SBEM input file, and supporting evidence (U-value calculations, glazing schedules, services specifications). The design-stage BRUKL is submitted with the building control application; the as-built version is issued to building control before sign-off and lodged on Landmark as the EPC. Without it, building control will not issue a completion certificate.