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Modern kitchen with skylight and large windows.

SAP Calculations for Extensions

When an extension includes more than 25% of the floor area as glazing, Building Control or your Approved Inspector require calculations to show that the design still meets Part L of the Building Regulations.


Oakland Energy can provide the SAP Calculations you need.   


We’ll remotely assess the extension and the existing property using your drawings, and advise on any improvements needed to meet Part L requirements.


Just straightforward guidance and everything you need so you can get on with building.


Contact us

Oakland Energy Ltd - Registered in England & Wales No. 11599703

Registered office: 8 Lodge Drive, Truro, Cornwall, TR1 1TX

Copyright © 2026 oakland energy ltd - All Rights Reserved.

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  • HOME
  • EXTENSIONS
  • NEW BUILDS
  • CONVERSIONS
  • ENERGY STATEMENTS - SEC1
  • SAP CALCULATIONS
  • OVERHEATING ASSESSMENTS
  • WATER EFFICIENCY CALCS
  • THERMAL BRIDGING
  • EPCs
  • AIR TESTING
  • INDUSTRY NEWS
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