Sap Calculations East Acton
Do you need Sap calculations for Part L of the building regulation? Then we are here to help. Contact us for a quote for your project.
What Exactly Are Sap Calculations?
SAP is short for Standard Assessment Procedure and is the UK government’s procedure for calculating the energy performance of residential properties. The calculations are required to demonstrate your building conforms with specified energy targets laid down in the building regs.
That’s pretty much it in a simple summary.
East Acton SAP Calcs For Dwelling Change Of Use
- Reports for Part L Compliance
- SAP EPC
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East Acton SAP Calcs For Overglazed Extensions
- Carbon Emissions Reports
- Heat Loss Calculations
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East Acton SAP Calcs For New Builds
- Reports for Part L compliance
- SAP EPC
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What does SAP mean?
Have building control, or even your architect asked you to get sap calculations?
Why will you need them and exactly what are sap calculations anyhow? Then read on.
You can either click the video on this page, where Andreas will shed some light on this, or continue reading.
When Are SAP Calculations Needed?
Sap calculations are usually required for 3 main reasons.
1. For all new properties.
2. For a dwelling change of use, for example altering a commercial building to residential flats.
3. For overglazed extensions.
The two main areas that the sap calculations will be looking at is that the carbon emissions from the dwelling are within set tolerances and that certain elements of the property, such as the walls, windows , floors and roof comply with certain thermal energy targets.
A good set of construction drawings will need to be given to the Assessor, because all the calculations are done from the building drawings ,so usually there is no need to visit the property.
Your Assessor will advise you of precisely what is needed. When the calculations are completed, an Energy Performance Certificate or EPC can also be produced.
If your sap calculations show that your property is not compliant, then our Assessor will give you advice on upgrades that can be made to make it so.
It could be costly if you realise at a late stage in the construction that the building is not compliant. So it is wise to liaise with the Assessor as early on during the project as possible.
Should you require advice on a project you could have in, or simply require a quotation, give us a call or fill in our get a quote form.
We also cover: Hammersmith, Hammersmith and Fulham, Willesden, Kensington, Kensington and Chelsea, Ealing, Childs Hill, Richmond upon Thames, Richmond, Wandsworth
Need to have an answer to a query you have about SAP calculations in East Acton? The following are the ten most common questions.
Sap Calculations, What Exactly Are They
This is certainly by far the most frequent query asked. Check out Andrea’s video explanation above, or read the full explanation here on the right.
How Much Are Sap Calculations
This could differ considerably depending upon the size and complexity of the dwelling, however a standard cost range will be between £120 – £300. Should you also require an Energy Performance Certificate (EPC) at the end of it there could be another charge of around £50 to lodge the EPC on the epc register. Reductions would typically be available for multiple dwellings especially if they are of the identical form of design.
What Is The Difference Between Sap and EPC
Before we explain the difference, this is what you will require depending on your job.
For a new build property you’ll need – SAP calculations and an EPC.
For dwelling change of use or conversion you’ll need – Sap Calculations and an EPC.
For overglazing on an existing dwelling you’ll – Sap calculations only.
SAP or Standard Assessment Procedure are the computations of pre defined data set of a buildings design that’s put together to display the energy effectiveness of a building. An EPC or Energy Performance Certificate is a overview report produced by the Sap calculations that produces a SAP rating from 0 to 100. This rating is expressed on the Energy Performance Certificate as A the highest to G the lowest. It will also list recommendations which would improve the rating of your dwelling.
There are really 2 kinds of EPCs. The first is a SAP EPC that is produced from building plans where all the components of the building are known. This would normally be required by building control to demonstrate that a property complies with specified targets required by the building regulations. Building control would also need to see the SAP calculations which shows in detail whether all the elements going into the property comply with the building regulations.
The second variety of EPC is the typical one that would be needed if you are selling, or renting a property. This kind of EPC uses what’s called rdSAP, which stands for Reduced Data Standard Assessment Procedure, and is used where particular thermal values of, for instance, the walls, roof, floors, etc, usually are not precisely known on an existing property. In this case assumed thermal values are used depending on the age of the property. This sort of EPC will be no use to demonstrate compliance with any building regulations. Sometimes building control would simply ask you to get an EPC, however what they would really need are the Sap calculations (which is the data behind the EPC) and the SAP EPC (which is actually summary report from the Sap calculations).
Still confused, then simply contact us for further advice.
What Are As Built SAP Calculations
These will be the final set of SAP calculations generated after the building has been completed to hopefully demonstrate that it is compliant with Part L1A of the building regulations. Prior to the construction starting, it should have had a set of “Design Sap” calculations to demonstrate that the planned dwelling, in theory at least, will be compliant with Part L1A.
How To Do Sap Calculations
No, this is not some thing you can do by yourself. Sap calculations need to be done by an On Construction Domestic Energy Assessor or OCDEA, working with approved Government software programs. The Assessor needs to be approved under one of the certification schemes and is also regularly audited to maintain their qualification.
What Info is Needed For Sap Calculations
Your Assessor would advise you of exactly what is needed. Typically you would need the following:
- Floor Plans to include sections and elevations
- Orientation of the property
- Construction specification of walls, roof and floors
- Specification for all doors and windows
- Primary and secondary heating
- Provision for providing hot water
- Any renewable technology (if any)
Sap Calculations For New Build
Every new property need Sap calculations to show compliance with Part L1A (Conservation of fuel and power in new dwellings) of the building regulations.
Sap Calculations For Extensions
It’s now trendy to have large bi-folding doors, sky lights and large quantities of glazing on new extensions. But with the latest building regulations the amount of glazing can be no more than 25% of the floor area of the new extension. Therefore over compensations in the thermal elements in other places within the property will have to be made to demonstrate that the CO2 emissions from the current house along with the planned extension is no worse than the existing house and an extension whose glazing is within the allowed amount judged against Part L1B of the building regulations.
You will need SAP calculations to find solutions and show compliance.
Sap Calculations For Conversions
When you are altering the use of a building, you will need Sap calculations. {The new dwelling will have to comply with Part L1B of the building regulations.}
Do I Need Sap Calculations
You will need Sap calculations for any of the following:
- Building a new property
- Changing the use of an existing property (e.g, a barn conversion, commercial building to residential)
- Extensions with more than 25% glazing
- Opening up the main house to an existing conservatory
- Extension where the extension is more than 50% of the original property wall area
- Garage conversions
- If requested by building control
This is not an exhaustive list. If you’re uncertain whether you need them, then phone us.

Our Services
What You Can Expect From Us
Trusted & Experienced
Our Assessors are fully certified and accredited with many years experience carrying Sap calculation in East Acton . We also cover the whole of the UK and can help on any job nationwide.
Reliable & Fully Insured
You will be allocated a dedicated Assessor who is also covered by full professional indemnity insurance up to £100,000 so you know you’re in save hands.
Prompt Service
We’ll respond to your enquiry within 24 hours. We’ll also help you to deliver your project within your timescale.
Satisfaction Guaranteed
We aim to provide 100% satisfaction and look forward to working with you.
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