SAP Calculations and EPCs

We pride ourselves on providing a high-quality service at an affordable rate. We can normally provide the calculations and EPCs within 2–3 working days of receiving your instructions. Please get in touch for a friendly discussion about your project.

1. SAP calculations and EPCs for new dwellings

All newly constructed domestic buildings require SAP (Standard Assessment Procedure) calculations and Energy Performance Certificates (EPCs) to demonstrate compliance with Part L1 of the Building Regulations (Approved Document L1).

Our accredited SAP assessors can guide you through the compliance process and provide all the relevant SAP documentation required to demonstrate compliance with Approved Document L1.

Our SAP service package includes:

“As Designed” SAP calculations
U-Value calculations
Full guidance and recommendations to achieve compliance
"As Built" SAP calculations and compliance reports
Issuance of EPCs

2. SAP calculations and EPCs for conversion projects

Conversion projects involving a material change of use (e.g. barn conversions and office conversions), or a change in the number of dwellings (e.g. converting one house into two flats), will require SAP calculations and Energy Performance Certificates (EPCs).

These conversion projects are required to comply with Part L1 of the Building Regulations, which provides energy efficiency guidance for both retained and new thermal elements.

Our SAP service package includes:

“As Designed” SAP calculations
U-Value calculations
Guidance during the design stage to achieve Part L1B compliance in terms of thermal and service efficiency
"As Built" SAP calculations and compliance reports
Issuance of EPCs

3. SAP calculations to justify excessive glazing

New extensions with openings exceeding 25% of the floor area will require SAP calculations to justify the additional glazing and demonstrate compliance with Part L1B.

To justify the additional glazing, we will undertake two SAP calculations (one notional and one proposed) for the whole dwelling to compare the Dwelling Emission Rates (DERs), Dwelling Primary Energy Rates (DPERs) and Dwelling Fabric Energy Efficiencies (DFEEs). We will help ensure that you can retain the amount of glazing you would like for your project.

Our SAP service package includes: