Do I need an electrical certificate?

Hi Sarah. You need a Minor Works Certificate for the lights, as this has changed from one accessory to many and the cable will be extended, although it's running from the same switch. If you had a shower pump and switch replaced like for like, this doesn't need a certificate. However, if it's a new circuit, this will require a Electrical Installation Certificate. Often electricians provide Minor Works Certificate for accessory changes. This is not required by regulations but often gives a customer piece of mind.

The electricain who carried out the works should have signed the works off and issued a minor works certificate its part of the job, always use qualifeid trade men who will issue a certificate on completion of their own works, would you have your car serviced and not ask for a guarantee.

I agree with everything A.S Electrics said but would like to add that if there was a new circuit connected to the consumer unit then this would also require building control notification.