You can change the appliance yourself if it is a replacement and not a new installation, however, there are rules relating to lettings of properties that require you to have safety checks of both the Gas and the Electrical circuits and appliances in the property to be let.
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Thank you. So to double check, I do not need to use a contractor with Part P certification? It would be replacing a standard extractor hood similar to this:
Can I just use a handy man to do the job?
So long as the installation is a replacement like for like appliance and not an new installation then yes, you can use a handyman and you don't need a Part P. This is given that the rest of the landlords regulations are followed with regard to the tests prior to rental.