What is a SAP Calculation?

A SAP assessment involves using a calculation method to predict the energy performance of a building – this includes houses, flats and all other residential properties. However, it is not just required to have a SAP calculation carried out on a complete new build, it is also a requirement for certain extensions which exceed the threshold and any conversions.

This calculation works by assessing the level of energy which is likely to be used, taking into account the expected occupancy, and based on an average, comfortable way of living.

A SAP (or Standard Assessment Procedure) then gives a ranking of the buildings estimated performance in terms of the energy use per unit of floor area, and Carbon Dioxide emissions – to show the impact it will have on the environment.

How is an SAP Calculation carried out?

The calculation is typically split into two parts:

    • The first part is the design stage. At this stage, the assessor will work up a preliminary SAP assessment based upon the proposed/assumed design and specification to see if compliance is met. If the dwelling is falling short of compliance, we work with our clients to find a solution which meets their requirements in terms or practically and budget.
    • The second part is the as-built stage. This stage will take place once a dwelling nears completion and air test has been carried out (if required). The assessor will upgrade all elements of the assessment with the final information and produce the as-built documents and issue the EPC.

It’s important that both stages take place, initially to ensure that the proposed design will meet compliance and avoid having compliance issues at the end of the project and finally to sign-off the dwelling and begin use or marketing the property.

At all stages, relevant documents will be provided to the client which can used to aid the progress, marketing or sign off of the project.

Why Are They Important?

Having a SAP calculation carried out on a new build property is actually a government requirement in order to meet UK regulations. Before a building can be put to market, it is essential that it attains a ‘PASS’ from the result of the calculation based upon the relevant project and building regulation type – L1A or L1B.

It is also important to know that such assessment can’t be carried out by anyone, it must be done by an accredited company. Here at Compliant EPC, we have the required accreditations to be able to carry out a full SAP assessment, along with the experience and knowledge to do the job properly.

As building regulations are forever getting tighter with a view to lowering carbon emissions across homes in the UK, this does impact the developer by meaning more higher specifications and reflectively more cost to achieve compliance. Here are Compliant EPC Ltd, we have expect knowledge and experience of all types of projects and aim to work with clients to find the most suitable and cost effective manner to meet compliance on their projects.

Why Choose Us?SAP

We pride ourselves on being a reliable energy consultancy, and we have helped many homeowners, architects, self-builders and contractors gain a ‘PASS’ on their standard assessment procedure over the years.

The SAP services we offer are at an all-inclusive price, meaning we will support you right from your initial enquiry through to getting the result of your assessment – with our expert team always being there to guide you and answer any questions you may have.

Get started today

If you have a residential property that hasn’t yet had a SAP calculation carried out, find out more about our service today. Give us a call on 01623 573009 to speak to one of our friendly and professional team.


  • 500m2+ = £1800.00 + VAT
  • 400 – 500m2 = £170 + VAT
  • 300 – 400m2 =  £160 + VAT
  • 200 – 300m2 = £150 + VAT
  • 0 – 200m2 =  £140 + VAT
  • Overly Glazed Extensions (Design flexibility Calculation) =  £140 + VAT

Our fees are typically based upon the size and complexity of a dwelling. We do prefer to offer a bespoke quotation
on a job-by-job basis to give you the best price – So get in contact and send us your plans today!

Prices stated are an all-inclusive fee including lodgement and registration fees, compliance advise, iterations and the
issue of all supporting documentation.

Prices stated are plus VAT



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