Sap Calculations Redbridge
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.
Redbridge SAP Calcs For Dwelling Change Of Use
- Reports for Part L Compliance
- SAP EPC
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Redbridge SAP Calcs For Overglazed Extensions
- Carbon Emissions Reports
- Heat Loss Calculations
- Free Advice
Redbridge 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: Redbridge, Barking, Barking and Dagenham, Waltham Forest, Newham, Stratford, Bromley, Hackney, Hackney, Mile End
Rather than trawl through a entire website to get the answers you’re trying to find, we have given answers to the ten most common queries asked about SAP in Redbridge.
So, Exactly What Are Sap Calculations
This is certainly quite possibly the most frequent query asked. Take a look at Andrea’s video explanation above, or read the full explanation here on the right.
How Much Do Sap Calculations Cost
If there are several properties with similar forms of constructions, then discounts may apply. For single properties you would be looking in the region of £120 – £300 dependant upon the intricacy of your building and also the dimensions. By supplying the plans, it will be possible to get yourself a fixed price quotation.
What’s The Difference Between Sap and EPC
Before we explain the difference, here is what you will need depending on your project.
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 calculations of pre defined data set of a buildings design that’s put together to show the energy effectiveness of a dwelling. An EPC or Energy Performance Certificate is a summary report derived from the Sap calculations which produces a SAP score from 0 to 100. This score is shown on the EPC as A the highest to G the lowest. It will also list recommendations which would improve the rating of your property.
There are really two kinds of EPCs. First is a SAP EPC which is produced from building plans when all the elements of the building are known. This would normally be required by building control to show that the dwelling complies with specified targets essential to the building regulations. Building control would must also see the SAP calculations which shows in greater detail whether all the components going into the property conform to the building regulations.
The second form of EPC is the typical one that would be required for anyone who is selling, or renting out a property. This kind of EPC uses what’s called rdSAP, which is short for Reduced Data Standard Assessment Procedure, which is used where particular thermal values of, for instance, the walls, roof, floors, etc, usually are not precisely known on an established property. In this case assumed thermal values are used according to the age of the property. This particular EPC would be no use to show compliance with any building regulations. Sometimes building control would simply ask you for an EPC, but what they would really need to have are the Sap calculations (which is the data behind the EPC) and the SAP EPC (which is actually summary report of the Sap calculations).
If you are still perplexed, then simply contact us to get more assistance.
What Are As Built SAP Calculations
These are the finished set of SAP calculations created when the building has actually been completed to hopefully demonstrate that it is compliant with Part L1A of the building regulations. Ahead of the project starting, it ought to have had a set of “Design Sap” calculations to show that the planned construction, on paper at least, would be compliant with Part L1A.
How To Do Sap Calculations
Unfortunately 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, using approved Government software programs. The Assessor must be certified under one of several accreditation schemes and is regularly audited to maintain their certification.
What Info is Required 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
All new dwelling need to have Sap calculations to prove 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 present building regulations the quantity of glazing can be no more than 25percent of the floor area of the new extension. Therefore over compensations on the thermal elements in other places within the property will have to be made to demonstrate that the CO2 emissions coming from the existing house along with the planned extension is no worse when compared to the existing house and an extension whose glazing is within the allowed amount judged against Part L1B of the building regulations.
You need SAP calculations to find solutions and illustrate compliance.
Sap Calculations For Conversions
For anybody who is changing the use of a building, you will need Sap calculations. {The new dwelling will have to comply with Part L1B of the building regulations.}
Will 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 checklist is not exhaustive. Phone us, if you are uncertain if you need them.

Our Services
What You Can Expect From Us
Trusted & Experienced
Our Assessors are fully qualified and accredited with several years practical experience carrying Sap calculation in Redbridge . We also cover the whole of the UK and can help on any project nationally.
Reliable & Fully Insured
You will be assigned a dedicated Assessor who is also covered by full professional indemnity insurance of up to £100,000 and that means 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 seek to provide 100% satisfaction and look forward to working with you.
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