SAP Calculations

SAP calculations are required for new-build dwellings, heavily glazed extensions, and change-of-use projects to residential, in order to demonstrate compliance with Part L of the Building Regulations.

The Standard Assessment Procedure (SAP) is the recognised methodology used to assess the energy performance of residential buildings. It evaluates the expected energy use of a property based on key factors such as building fabric, insulation levels, heating systems, ventilation, and lighting.

The assessment produces a SAP rating on a scale from 1 to 100+, representing the overall energy efficiency of the dwelling. A rating of 100 indicates zero net energy cost, while ratings above 100 suggest the building may generate more energy than it consumes.

What We Provide

As designed SAP calculations for Building Control submission

Design stage advice to improve SAP scores

Iterations to achieve compliance where required

As built SAP calculations and final documentation

Clear guidance on achieving Part L requirements

Why It Matters

Getting SAP wrong can lead to delays at Building Control, redesign work, or additional costs late in the project.

Early input ensures:

Compliance is achieved efficiently

Design changes are minimised

Cost effective solutions are identified early

Accreditation

3CO Limited is accredited as an On Construction Domestic Energy Assessor (OCDEA) through Elmhurst Energy.
All SAP calculations are carried out in line with current methodologies and regulatory requirements.