Affordable Sap Calculations Worcester

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So, What Are Sap Calculations?

If you are reading this article, you have more than likely been asked by another person, normally your building control official, to supply sap calculations for your building project.

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



Worcester SAP Calcs For Dwelling Change Of Use

  • Reports for Part L1B Compliance
  • Free Advice

Worcester SAP Calcs For Overglazed Extensions

  • Carbon Emissions Reports
  • Heat Loss Calculations
  • Free Advice

Worcester SAP Calcs For New Builds

  • Reports for Part L1A compliance
  • Free Advice

What does SAP mean?

SAP is short for Standard Assessment Procedure and its the UK government’s way of determining the energy efficiency of buildings. The calculations are needed to prove that a building complies with specified energy targets set down in the building regs.

In a brief overview, that’s essentially it.


When Are SAP Calculations Needed?

Sap calculations usually are required for three main reasons

1. For all new dwellings
2. For a dwelling that’s changed its use, such as converting a commercial building to residential flats.
3. For extensions that have over 20% 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 done by a certified and accredited On Construction Domestic Energy Assessor. There is not any need to visit the property because all the computations are carried out from the building plans ,so a good set of plans are very important. An EPC or Energy Performance Certificate is usually produced after the computations are completed.

Your Assessor can provide additional guidance in the event the calculations show your building isn’t compliant, as well as inform you which would be the most effective improvements to make. It’s very important to liaise with the Assessor as early on in the project as possible because when the building is finished any non-compliances might be quite costly to rectify.

Should you require advice on a project you may have in , or require a quotation, call us or fill in our get a quotation form.


SAP Calculations in Worcester The Ten Most Typical Questions Asked.

So, What Are Sap Calculations?

This really is by far the most frequent query asked. Take a look at Andrea’s video explanation above, or read the full explanation here on the right.

What Is The Cost Of Sap Calculations

If there are various properties with similar types of constructions, then discounts may apply. For individual dwellings you would be looking in the range of £120 – £300 depending on the difficulty of your building along with the measurements. By supplying the plans, you will be able to get a fixed price quotation.

What’s The Difference Between Sap and EPC

Before we explain the difference, this 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 computations of pre defined data set of a buildings design that’s created to display the energy performance of a building. An EPC or Energy Performance Certificate is a overview report produced by the Sap calculations that produces a SAP score from 0 to 100. This score is expressed on the EPC as A the highest to G the lowest. It will also list suggestions which would increase the rating of your dwelling.

There are really 2 kinds of EPCs. First is a SAP EPC that is produced from building plans when all the elements of the building are known. This will normally be needed by building control to demonstrate that the property satisfies specified targets required by the building regulations. Building control would also need to see the SAP calculations which illustrates in detail whether the many elements going into the property comply with the building regulations.

The 2nd form of EPC is the common one that will be necessary if you are selling, or renting 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, are not precisely known on an established property. In this instance assumed thermal values are used according to the age of the property. This kind of EPC would 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 require 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 perplexed, then simply call us for further assistance.

What Are As Built SAP Calculations

These are the final set of SAP calculations produced once the building has been completed to show that it is compliant with Part L1A of the building regulations. Ahead of the construction starting, it should have had a set of “Design Sap” calculations to demonstrate that the proposed construction, in theory at least, would be compliant with Part L1A.



How To Do Sap Calculations

Unfortunately this is not some thing you could do yourself. The calculations must be carried out by an On Construction Domestic Energy Assessor or OCDEA, using approved Government software. The Assessor must be approved under one of several accreditation schemes and is regularly audited to keep 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

Every new property need Sap calculations to demonstrate compliance with Part L1A (Conservation of fuel and power in new dwellings) of the building regs.


Sap Calculations For Extensions

It’s now popular to get large bi-folding doors, sky lights and large quantities of glazing on new extensions. But under the current building regulations the quantity of glazing must be no more than 25% of the floor area of the new extension. So over compensations in the thermal elements in other places of the property will have to be made to show the CO2 emissions coming from the current house along with the proposed extension is no worse than the existing house and an extension where the glazing is within the allowed amount judged against Part L1B of the building regulations.

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


Sap Calculations For Conversions

When you are 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.}


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 checklist. If you’re not sure whether you will need them, then simply phone us.


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What You Can Expect From Us

Trusted & Experienced

Our Assessors are fully certified and accredited with many years practical experience carrying Sap calculation in Worcester . We also cover the whole of the UK and can help on any project nationally.

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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.

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