Accredited assessors
Nationwide coverage
Established in 2012
Energy efficiency reports for Building Regulations compliance
Planning a house extension? Expert Energy Consultancy Ltd provides specialist extension calculations to ensure your new space complies with Part L Building Regulations. Whether installing large glazed doors or using advanced materials, our accurate assessments help you meet energy efficiency requirements while building smart and sustainably. We offer tailored guidance on compensatory upgrades and supply all documents required for Building Control submission.
Contact us today to discuss your house extension project and get a free review of your plans.
What is a SAP calculation for a house extension?
A SAP (Standard Assessment Procedure) calculation for an extension measures how the new space affects the overall energy efficiency of your home. It's often needed when the glazing exceeds 25% of the floor area, the space is thermally separated, or you use modern materials.
These calculations ensure the extension won’t lead to excessive heat loss and that energy-saving solutions are in place to offset any increased heating demand. With transparent reporting and expert guidance, we help you easily achieve compliance.
Our house extension SAP services
Our team simplifies complex rules and delivers clear, practical advice, whether you're managing your build or working with an architect. You’ll get expert support from plan review to final sign-off. We offer a full SAP calculation service for extensions, including:
✓ Glazing area assessment and reduction strategies
✓ SAP modelling using approved software
✓ Carbon emissions comparisons
✓ Advice on insulation upgrades or renewables
✓ Final documents ready for Building Control submission
