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SAP Calculations for Extensions

We all want lots of light – and we all like lots of lovely glazing right?

Part L of the Building regulations requires that areas of new glazing should account for no more than 25% of new floor area. Of course, many extension designs will propose more than this, and therefore will not comply with this rule.

We can help you overcome this hurdle easily and quickly. SAP Calculations are produced by accredited energy assessors, and can be used to demonstrate how your proposal complies with building regs requirements, even with large areas of glazing.

SAP Calculations for Extensions – How Do They Work?

Glazing and openings lose more heat than walls and roofs, which is why the building regs set a limit. However by upgrading or over compensating in construction of other elements, or perhaps demonstrating additional, useful solar gains by virtue of that extra glazing, the negative impact of larger expanses of glass can be removed.

SAP Assessment for Extensions

There are further options available to take account of upgrades to the existing property – especially useful if the dwelling is receiving a make-over too. We can guide you through all the options.

Many ‘change of use’ schemes will also be subject to SAP regulations, like flat conversions or commercial-to-residential conversions.

What Do We Need?

To carry out a full SAP assessment, your assessor needs two things:

  • A set of existing and proposed plans, to scale
  • A summary of the intended construction and services details

The work is then carried out with a desktop assessment. We don’t need to come to site or carry out any surveys at all.

SAP Calculations For Extensions – Our Speciality

We carry out a large volume of SAP Calculations for extensions on a daily basis, and can provide you with all the help and guidance you need.

We’ve helped many hundreds of architects, contractors and homeowners all over the country and it is extremely rare that we do not find a solution – with no extra cost or change to your plans.

If required, we will even deal with your Building Control Officer, understand what is required, and take care of everything – Easy!

To find out more about conversions and extensions see Part L1b – The Info.

Would you like to discuss your project?

Call us for a chat on 0330 055 34 05 or email be@buildenergy.co.uk.

Recent Projects

I started working with Build Energy just over a year ago now, and I have to say they are the very best I have ever worked with. They are so helpful, pragmatic and very patient with me, taking the time to explain the complexities that I do not understand (which are many!) and they deliver the very best outcomes through an open and collaborative approach. I am genuinely grateful to have discovered such a great team of people and cannot recommend Build Energy highly enough.    

Mick Baird
- Founder | DG Architecture

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