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SAP EPC (Standard Assessment Procedure) - On-Construction EPC - SAP Assessors UK


Does my property need a SAP Assessment and what is SAP?


All new homes need a SAP Calculation or rating because it has been a requirement since 1995 as part of Building Regulations Part L. Building control must have calculation submitted to them before any work starts on site. This should therefore be done at the design stage.

SAP is an abbreviation for Standard Assessment Procedure a system for measuring the energy rating of residential dwellings, as layed down by UK Government, as their recommended method for working practices.

This will include New buildings, converted premises and buildings that have had a change of use where building regulations apply. Property conversions are also included where a barn for instance has been made into domestic accommodation or commercial premises into flats or houses. Some extensions will also apply with more than 25% glazing to floor area. However different rules apply here so you will need to consult your local building control officer or planning office regarding this.

What is a SAP Rating?

Many things are taken into consideration when working out a SAP Rating including space heating, water heating, ventilation and lighting based on energy costs. Also cost savings from energy generation technologies. Floor areas are measured so that adjustments can be made as it is independent of dwelling size for a given built form. SAP ratings go from a 1 to 100. The lower the number the more the running costs so an improvement to energy efficiency will hope to higher the number to help lower heating and lighting bills.



SAP - Standard Assessment Procedure



A good way to compare the energy performance of different homes is with a SAP Rating as the higher the SAP rating the lower the fuel costs and carbon dioxide emissions associated with them.

How will the assesment be carried out?

We will provide you with an SAP Assessor who is fully qualified for the job in hand. All our assessors are accredited with one of the Government approved accreditation bodies and comply with all he latest regulations and conventions. A site visit is not usually necessary as the assessor will work from architects plans and construction specifications which may include HVAC (heating, ventilation and air conditioning) details. The SAP assessor can help to minimize carbon emissions and energy used in the building and therefore help the architect or designer with the new dwelling in the planning stages.



What we require from you?

Since SAP calculations are based upon a desktop exercise, and not a site survey, it is critical, that the correct information is submitted. For this reason drawings need to be accurate and to scale, and show all sections, elevations, floor and site plans.


Please use the following list to send us as much information as possible.


1. Postcode and full site address.

2. Plans of each storey, normally at 1:100 scale.

3. Site plan to include orientation of the dwelling(s).

4. Elevations drawings for each elevation.

5. Sectional drawings of the dwelling.

6. A written specification which must include:

a. Details of the principal heating and hot water system to include make and model of boiler, details of heating emitters, hot water cylinder size (if applicable) and the system controls.

b. Secondary heating system details that may be present.

c. Internal and external lighting details.

d. Ventilation system details.

e. Details of the construction of all different floors to the property to include type and thicknesses of insulation and any other building products used.

f. Details of the construction of all different external walls to the property to include type and thicknesses of insulation and other building products used.

g. Details of the construction of all different roofs to the property to include type and thicknesses of insulation and other building products used.

h. Details of the doors and windows to include sizes, type of frame, type of glazing, thickness of glazing, any low emissivity applications.

i. Details of any renewable technologies such as ground source or air source heat pumps, wind turbines, biomass boilers, solar water heating or Solar PV (photovoltaics).


Let us give you a quote.

In order for us to give you a quote we will need an electronic version of the plans, so we can assess the complexity of the job we are quoting for. This needs to be send to for the attention of the Energy Assessments Manager. If you accept our quote, we will need you to send our assessor full original plans in hard copy and to scale together with all the above information. We will provide you with the address and person to send the information to, once we have your full contact details.