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Sap Calculations Smethwick

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Sap Calculations, What are They?

Have building control or perhaps your architect requested you to get sap calculations in Smethwick. Why will you need them and precisely what are sap calculations anyhow? Then keep reading.

You can click on the video clip on this page, where Andreas will shed some light on this, or continue reading.



Smethwick SAP Calcs For Dwelling Change Of Use

  • Reports for Part L1B Compliance
  • Free Advice

Smethwick SAP Calcs For Overglazed Extensions

  • Carbon Emissions Reports
  • Heat Loss Calculations
  • Free Advice

Smethwick SAP Calcs For New Builds

  • Reports for Part L1A compliance
  • Free Advice

What does SAP mean?

SAP is short for Standard Assessment Procedure and is the UK government’s means of calculating the energy performance of buildings. These calculations are required to prove your building complies with specific energy targets laid down in the building regs.

That’s more or less it in a simple overview.


When Are SAP Calculations Needed?

Sap calculations usually are required for 3 reasons

1. For all new properties
2. For a dwelling that’s changed its use,e.g converting a commercial building to residential flats.
3. For extensions that have more than the permitted amount of glazing

There are two main targets that the sap calculations are required to demonstrate. Firstly that the dwelling emission rate (DER) and the dwelling fabric energy efficiency (DFEE) comply with certain targets.

The computations are carried out by a certified and approved On Construction Domestic Energy Assessor. There is not any need to visit the property as all of the computations are carried out from the building plans ,so a good set of plans are very important. Once the calculations are done, an Energy Performance Certificate or EPC can also be created.

If your sap calculations reveal that your property isn’t compliant, then your Assessor will give you suggestions about upgrades which can be made to make it so. It is very important to liaise with the Assessor as early on in your project as possible because when the building is finished any non-compliances might be quite costly to rectify.

If you need advice on a project you could have in , or simply require a quotation, call us or fill in our get a quote form. We’re here to help.


Want an answer to a question you may have about SAP calculations in Smethwick? Listed below are the 10 most common questions.

Sap Calculations, What are They?

This really is probably the most frequent query asked. Check out Andrea’s video explanation above, or read the full explanation here on the right.

Sap Calculations, How Do They Cost

The typical cost range will be between £100 – £300, this can be depending upon the difficulty and proportions of the property. There will probably be another charge of approximately £50 if an Energy Performance Certificate is called for at the end of the construction. For a number of dwellings of similar designs, then discount rates might be offered.

What’s The Difference Between Sap and EPC

Before we explain the difference, here is what you will need 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 properties design that’s put together to demonstrate the energy efficiency of a property. EPC means Energy Performance Certificate and it’s a summary report from the SAP calculations in an simple to grasp report, that could also be used to market or rent a property.

There are really 2 kinds of EPCs. The first is a SAP EPC which is produced from building plans where all of the elements of the construction are known. This would normally be required by building control to demonstrate that the dwelling satisfies specific targets essential to the building regulations. Building control would also have to see the SAP calculations which illustrates in detail whether all of the components going into the property comply with the building regulations.

The 2nd type of EPC is the regular one that would be needed if you are selling, or renting a property. This type of EPC uses what’s called rdSAP, which means Reduced Data Standard Assessment Procedure, and is used where certain thermal values of, for instance, the walls, roof, floors, etc, usually are not precisely known on an existing property. In this instance assumed thermal values are used based on the age of the property. This particular EPC will be no use to demonstrate compliance with any building regulations. Sometimes building control would simply ask you for the EPC, but what they would really need are the Sap calculations (which is the data behind the EPC) and the SAP EPC (which is a summary report from the Sap calculations).

Still confused, then call us to get more advice.

What Are As Built SAP Calculations

These are the final set of SAP calculations produced when the dwelling has been completed to confirm that it is compliant with Part L1A of the building regulations. Ahead of the building starting, it ought to have had a set of “Design Sap” calculations to demonstrate that the planned dwelling, on paper at least, will be compliant with Part L1A.



How To Do Sap Calculations

No, this is not something that can be done yourself. The calculations must be done by an On Construction Domestic Energy Assessor or OCDEA, using approved Government software. The Assessor must be approved under one of the accreditation schemes and is regularly audited to maintain their accreditation.

What Information 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 dwelling require Sap calculations to show compliance with Part L1A (Conservation of fuel and power in new dwellings) of the building regs.


Sap Calculations For Extensions

It’s now quite popular to have large bi-folding doors, sky lights and large quantities of glazing on new extensions. However under the existing building regulations the amount of glazing must be no more than 25% of the floor area of the new extension. Therefore over compensations on the thermal elements in other areas within the property will need to be made to show that the CO2 emissions from the current house and the planned extension is no worse than the existing house and an extension where the glazing is within the permitted amount judged against Part L1B of the building regulations.

You will require SAP calculations to find solutions and illustrate compliance.


Sap Calculations For Conversions

When you are changing the use of a dwelling, you will require Sap calculations. {The new dwelling will have to comply with Part L1B of the building regulations.}


Will I Need to have 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 checklist. If you’re uncertain whether you need them, then simply phone us.


Our Services

What You Can Expect From Us

Trusted & Experienced

Our Assessors are fully certified and accredited with several years experience carrying Sap calculation in Smethwick . We also cover the whole of the UK and can assist on any job nationally.

Reliable & Fully Insured

You will be assigned a dedicated Assessor who is also covered by full professional indemnity insurance up to £100,000 so that 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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