Discuss New En-Suite – What electrical testing & certification is required? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
If the electrician is registered with a scheme which allows self-certification then it is not necessary to notify until completion.
If the householder employs an electrician who is not registered (or wants to do it himself) then it must be notified prior to the work beginning.
This is, of course, now only applicable to new circuits, new consumer units and work within the zones of special locations, which I presume this work is.
However, all electrical work must comply with Part P and be certified - as opposed to notified, the two are not connected.
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