Have you asked the contractor that is wiring your extension?
It will be your resposibility to make sure things are to the relavant standards (the builder may be doing the work, and you may have got a local electrician) but it's you that has to ensure compliance
The council may require you to either have the work done by a 'certifier of construction' or someone that meets the standards of a coc
In England / Wales the council pay for inspection etc, in Scotland the home owner is responsible (as detailed above)
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