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Regulation for rewring back box?

Former Community Member
Former Community Member

Hi, I'm currently holding an MEng in EEE, but not a certified electrician otherwise. 

I want to install smart light switches in my “dwelling”. I have encountered issues where the current back box is standard 74x74x25, but I would need extend it to 86x86x38 for the new light switch. 

I want check do I need part P certificate, or planning permission? How to be compliant while minimise the cost? (I have no experience in dwelling electrical work)

PS: The dwelling is a new build (2019) 
PPS: I might consider obtain required certificate(s) myself if is not too expensive. Since I like do these kind of work, so it might be cost effective in the long term. 

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    Sparkingchip: 
    Bear in mind there could be more than one circuit at both switches and lighting points.

    Yes, it doesn't seem unreasonable to have the two way switch at the bottom of the stairs for the landing light fed from the upstairs lighting circuit, and the switch at the top for the hall light fed from the downstairs one. So that's two switches, each with two circuits.

    Another heffalump trap would be having the landing lights fed from the downstairs circuit.

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    Sparkingchip: 
    Bear in mind there could be more than one circuit at both switches and lighting points.

    Yes, it doesn't seem unreasonable to have the two way switch at the bottom of the stairs for the landing light fed from the upstairs lighting circuit, and the switch at the top for the hall light fed from the downstairs one. So that's two switches, each with two circuits.

    Another heffalump trap would be having the landing lights fed from the downstairs circuit.

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