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SAP Calculation FAQs


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SAP Calculations Frequently Asked Questions



Who is Able to Complete a SAP Calculation?

In theory, it is possible to complete a SAP calculation yourself, but this is definitely not advisable. SES, have Elmhurst Accredited SAP Assessors who can carry out any SAP Calculation for you, so we would advise hiring us to ensure that the job is done correctly and within the framework set out by Government.

SES also use specialist software that allows for the SAP calculations to be completed in a timely manner.

How is a SAP Calculation Worked Out?

The calculations used to provide an accurate SAP calculation are complex, but in a nutshell we will assess how much money the cost of providing heating, ventilation and lighting to the house will be, and then subtract any energy saving solutions from this total.

In addition to this, the amount of carbon dioxide (CO2) that will be released from the dwelling in order to maintain a comfortable and acceptable place to live will also be calculated. The dwelling is then allocated a score from A+ to G, with A+ being the best and G being the least energy efficient.

If you do not achieve compliance with the designs/specifications provided, we are able to advise a number of different ways in which you can raise the score, usually through very cost effective means. We can then repeat the SAP calculation to prove compliance with building regulations.

Why is a SAP Calculation Necessary?

In order to meet current building regulations, home builders will need to gain a ‘pass’ on their SAP Calculations. Without it, building control will not sign off the development and the property cannot be let or marketed for sale. SAP calculations are also needed in order to satisfy a number of planning conditions, as well as to conform to the Code for Sustainable Homes.

But there are other reasons to care about SAP. A SAP assessor can help the designer or architect to shape the energy profile of a new dwelling – minimising its energy use and carbon emissions. 

When Should a SAP Calculation Be Completed?

The one key point – even more important than those above, is to start early. Many people leave the SAP calculation until the last minute though, which isn't advisable. If we receive a set of plans half way through a build, there’s not a lot we can do to change the energy performance of that building.

This scenario also leads to much bad practice and usually the installation of unsuitable, expensive technologies added in hindsight just to pass building regs or to meet a planning condition.

Avoid this by engaging with your SAP assessor as early in the process as possible – often this will be well before planning has even been submitted, and certainly well before building regs applications.


Does Every New Dwelling Need a SAP Calculation?

It is the case that a SAP assessment must be completed on all new build properties, in order to gauge the energy efficiency of each one. In situations whereby the building is part of a large development of the same house type, a SAP calculation can be taken from a sample, and then applied to each of the buildings. This will mean that every plot has a SAP calculation attached to it, but that not every plot is actually assessed.

When working on a development of a number of the same house types, we will more than happily adjust our pricing to reflect the reduced workload. We can also carry out other tasks concurrently if needed, to ensure that the properties meet guidelines laid down in other schemes.

Is it just for New Builds?

Not at all. Many extensions, conversions and change of use schemes will require SAP Calculations under Part L1b of the building regs:
  • Extensions with more than 25% glazing-to-floor area
  • Barn conversions
  • Commercial to domestic conversions
  • Conversion of a single dwelling into flats or apartments 
What Needs to Be Provided to Complete a SAP Calculation?

We are able to complete a SAP calculation without the need to visit your site, however we must receive some documentation from you. We will require:
  • Drawings to scale, accurate and show all elevations, sections, floor and site plans.
  • We will also require you to complete a SAP form, which can be found at our download section here
However, please do not hesitate to contact us with any queries.

SAP Assessments and EPCs – What’s the Difference?

Basically speaking, SAP is solely an assessment, whereas an EPC is a certificate. The two certainly have much to do with each other, as the EPC is produced based on the results of the SAP assessment in order to show the energy use and CO2 emissions from a building. Although there are certain similarities between SAP assessments and EPCs, it is important to remember that they are both completely separate entities. At SES, we are able to produce EPC's as well.

Need Help With Your Project?

Give SES a call on 01279 873380, alternatively email enquiries@sestesting.com