SAP EPC - when and what for change of use?

[regdorp]

Hi all,  I've got an old commercial building that we have permitted development to convert to a dwelling. Looking at the SAP EPC requirements at the moment and wondering if you guys could help clarify a few bits please?

 

1) Given it is a conversion, do BC need to see anything other that the SAP EPC at the end? Or do they need to see compliance calcs etc?

 

2) being a conversion, I don't need to worry about achieving TER and TFEE, right?

 

3) The nature of the building means that every wall is a different construction method. To add to this, I'm having to Insulate with different techniques (some walls not flat enough etc), e.g. some will be on top of battens, some in/over a stud wall built inside the main wall etc. Is this combination likely to confuse anyone I use to do the SAP EPC for me? I do have the Stroma software myself and have been playing around, but some of the assumptions I'm not sure on.

 

4) As a conversion, is it just the U values, lighting and heating I need to worry about? For the lighting it is just ensure >75% are low energy fittings. For the heating it will be electric radiators and they just need to have programmers and thermostats to comply. Or have I missed something?

 

Any and all help would be appreciated! Thanks,

David

[PeterW]

You need to read the requirements of L1B as that (assuming England/Wales) relates to conversions not new builds. 
 

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/697629/L1B_secure-1.pdf

You will need to file plans showing how you’ve met the requirement - with your build the elemental method for uValues will be easier and more appropriate. 
 

In terms of lighting - just use LED fixtures everywhere as it is easier and simpler. 
 

Fire safety will be your other main concern with a conversion - check carefully how you build up the structure.