SAP Calculations for Extensions

Nowadays many extensions exceed the 25% glazing in relation to the new floor area allowance stipulated in the L1B Building Regulations. If this is the case for your project, you will need to produce SAP Calculation in order to gain Building Compliance for your extension.

Achieving L1B Compliance for Extensions

In order to help you achieve compliance, we will carry out two SAP calculations, to compare the proposed extension to a notional extension of the same size and orientation. The aim of this comparison is to demonstrate that the carbon emissions for the proposed extensions are equal or lower to those of the notional extension, which would only have the 25% glazing.

Working With RS Energy

By trusting us with the SAP calculations for your extension, you can have the peace of mind that your project will advance smoothly, as we have a 100% pass rate. We’ll assist and advise you from beginning to end, providing compliant reports to satisfy Building Control. Get in touch with us today to learn more. 

Frequently Asked Questions

Do You Need SAP Calculations for an Extension?

SAP calculations are required for extensions if the proposed area of new glazing exceeds 25% of the total floor area, plus the amount of glazing that is taken out, in order to comply with Building Regulations.

When are SAP Calculations for Extensions Required?

SAP calculations are required on all new residential dwellings, as well as a predicted EPC rating. All residential conversions and some residential extensions also require SAP calculations prior to work beginning. This is required under Part L of the Building Regulations.

What are SAP Calculations?

Standard Assessment Procedure (SAP) is the government adopted methodology for calculating energy performance in domestic properties. Introduced into Building Regulations in  1995, this is a vital step towards improving the energy performance of buildings, and reducing CO2 emissions.

Why Are SAP Calculations Required?

SAP Calculations are required in order to increase energy efficiency, and reduce CO2 emissions in domestic buildings.

With over 40% of energy use in the EU being directly attributable to the operation of buildings, and 44% of the UK’s carbon emissions resulting from buildings, addressing energy use and emissions in buildings has the potential to make a substantial difference to the overall energy usage and total carbon emissions in Europe.

The last government made a legally binding commitment to reduce greenhouse gas emissions by 80%, relative to 1990 levels, by 2050.  As a result of these efforts to address greenhouse gas emission rates, more stringent regulations around building emissions are now in force.

Request a quote

Complete our quote form today. By working with RS Energy you’ll enjoy the following benefits.

No additional charge for revisions

We’ll help you gain the compliance ensuring you’re not left stranded

We go that extra mile for all of our clients

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