We work with clients nationwide providing SAP calculations and exceptional consulting services that are catered specifically to their requirements. Take a look at the services RS Energy offer or contact us if you would like to discuss your project or obtain a quote

New Build SAP Calculations

SAP Calculations from design through to lodging the EPC. Contact us

SAP calculations conversions

Part L1b compliance from design to lodging the EPC. Get in touch

SAP calculations for extensions

Does your extension exceed the 25% glazing allowance?

We have a 100% pass rate

Get in touch

Part G Water Calculations

We can take care of you water calculations in order to comply with Part G

Get in touch

Air Permeability

New build houses will require Air Permeability Testing in order to gain compliance – we can arrange this for you.

Get in touch

Construction, Building Compliance

Covering BREEAM Assessments, LEED Assessments, Biodiversity Impact Assessments, Nutrient Neutrality Assessments, WELL Building Assessments and Home Quality Mark (HQM) Assessments

Our Company. Our Values. Our Beliefs.

Competitive Pricing

We will not charge you a first class price tag for our first class service. Our prices are extremely competitive.

Fast and Reliable

We can turn around reports in 24 hours if needed.

Certified Experience

After Training with the Building Research Establishment (Bre) and Qualifying as an ABBE On Construction Energy Assessor we are fully qualified and Accredited to assist you with your SAP Calculations and Building Compliance requirements.


We are constantly updating our skills and keeping up to date with changes.

No Risk

We will not charge extra for SAP Calculation revisions if your project is not passing first time. We will provide advice and guidance on achieving compliance in the most cost effective way.

Great Support

We will always go that extra mile for our clients.

Let us take care of your Building Compliance Requirements – For a quick, no obligation quote please send us some plans of your project, we will then tailor our quote to your project and send it back to you ASAP. Contact us today

Quote Request
Click or drag files to this area to upload. You can upload up to 10 files.
Please upload plans of your project so that we can provide an accurate quote

For a mere property developer, Part L of the Building Regulations can be rather overwhelming, however, when you have Natalie of RS Energy to guide you through it, what seems an enormous hurdle, disappears. To anyone and everyone who encounters the complexity, to what many of us would consider the irrelevance of outdated Part L, I cannot recommend Natalie high enough to help navigate you through its complexities. In a word, she is phenomenal.

Excellent professional service, highly recommend

Natalie at RS Energy is professional and can help with any SAP and EPC needs. I have worked with her for years

RS Energy provided an efficient and professional service. Natalie was very pleasant to deal with and helpful throughout. I wouldn’t hesitate to recommend RS Energy.

With Natalie’s guidance and expertise on design issues and material choice we have achieved a 100% reduction on TER. An unparalleled superb service.