SAP Calculations (DIY?)

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We live in a 3 bedroom semi built in 2011. I have the original EPC / SAP. In 2013 we also added an orangery 3x4m to the rear. Now we're having a Supalite roof replacement including building regulations submission.

Once that is done - we want to remove the patio doors leading to the 'former orangery'. I've been advised that we need to complete a SAP and pay the council a fee. Is it possible to complete the SAP ourselves based on the original EPC and the Supalite U value information or is it way more complicated than this?

How much are council charging for a certificate? And how much does a SAP calculation cost if it isn't a DIY job!?

Thanks.
 
Will the same issue not come up when / if we want to move?
 
Well with all the money you save on fees/certificates, etc. you can probably buy new doors, but obviously it's up to you.
 
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