i would say that even if it was a complete re-wire ,
you wouldnt have to change them because a lot of
the time you would only be replacing the cable and
utilising the exsisting sockets etc
New builds = compliant with part M, so CU, sockets and light switches must be 450-1200 from 'finished' floor level.
On alterations, new circuits and re-wires is is acceptable to retain the sockets and switches at the dwellings existing positions.
On rewires the same applies, since the majority of the existing positions for sockets and switches could be redeployed for the new wiring.
Ditto joist holes and routes, it's stupid to rewire an existing dwelling and add extra notching and holes to joists- They would end up like Swiss cheese and the integrity of the joist could be compromised.
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