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SAP Calculations for Extensions and Conversions

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Do I need SAP Calculations for an Extension or Conversion?

The simple answer is Yes.

You will require SAP calculations whether you are extending, converting or changing the use of a property.  You will need to ensure that your specifications meet the requirements of building control. (Part L1B in England and Wales and technical handbook section 6 in Scotland).

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Building regulations state that any new floor space within an extension should not have more than 25% of glazed areas.

Of course, many extensions have more than this and therefore as standard would fail the assessment.

We can help and assist you in getting around this issue quickly and hassle-free.

The Assessment


Conversions may be defined as creating a new dwelling from an existing building. For example, changing an office building into flats or converting a barn.

In this case, you need to ensure that the required U-Values are met and the new heating system meets all minimum efficiencies.



If you are planning on building a conservatory that is thermally separate from the dwelling, it will be treated as an extension and therefore require SAP calculations.

We are happy to deal with your Building Control Officer and take care of everything so that you don’t have to.

With Over 100 five star review rating Reviews, We Are The SAP Calculation Experts You Can Trust

Why Choose Us?

  • Professional and reliable
  • Flexible appointments to suit you
  • Friendly, practical advice
  • 10 years’ experience in the industry
  • We work with you every step of the way
  • Affordable pricing

SAP Calculations for Extensions and Conversions

Focus 360 has a strong history in providing SAP Calculations for extensions and conversions. Our highly qualified building surveyors will undertake SAP Calculations from supplied plans and construction specifications and ensure that all new and existing features are taken into account.

We will always consult and advise several variations on how to get the job done, working with you every step of the way. A typical example could mean leaving existing walls and floors untouched and where new heating systems may need extra consideration to pass.

We are happy to deal with your building control officer directly to understand what is required and take care of everything so that you don’t have to.

We can also offer these additional services …

Air Testing 

Air Testing

Sound Testing

Sound Testing

Water Calculations

Water Calculations

U-Value Calculations

Water Calculations

Do you need SAP calculations for a new build?

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SAP Untangled

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SAP Untangled

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