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There are a lot of things you can do in the house without having to inform building control which is Part P. Understanding Part P and it's scope is a fair sign that you have some knowledge of electrical safety and the modern health and safety regime.
With the garage job it seems you don't really know where to start in terms of how you would change the supply to meet modern demands so you're going to need professional help or take a fairly long course in electrical engineering to equip you with the answers. It's not impossible to figure out what needs doing but you would still need to have it signed off. Some electricians are members of schemes that don't allow them to sign off third party work, the regulations also require that they are involved in the job from the beginning, when that gets complicated it's easier just to do the job yourself if you're a professional electrician.
One of the easy rules of Part P to bear in mind is 'New Circuits need signing off'.
Adding sockets is fine as long as you don't add spurs to spurs. Moving sockets is fine as long as you follow the simple rules for allowed routing. You're supposed to fill out minor work certificates but I find it hard to type that without smirking :)
I started to get involved in domestic electrics 20 years ago because I found it fascinating, there's a lot of information out there if you want to learn but it's a pretty big subject. I'm qualified to take on smaller problem solving jobs and it fits with my joinery and renovation work.
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Sparkies all make tutting noises, it is part of the quoting process. Does the fuse board have a NICEIC sticker on it dating the next inspection. Any inspection paperwork when it was installed?
Do you have a friendly sparky? If not might be worthwhile to get a check or a test done to see if there any faults on the circuits. At a guess for the garage you will want to power a couple of KW safely so probably adding a new separate breaker...then running an armoured cable out to the garage.
Home electrics - talk to me.
I've had three people now make tutting noises and warn me that it's a can of worms, etc.
Got an old house (1930s) that a survey says has been 'rewired' in the past. Lots of surface mount sockets but a modern consumer unit. Not really dug into exactly how each circuit runs yet because we've not moved in.
Basically we'll want to make some small alterations as time goes by. Moving/adding sockets, moving and adding lights, and sorting our the garage electrics (which is currently one socket and a light bulb on a single spur (I think)).
Am I really asking for a hard time because any work, even if I can do it myself, falls under part P?People have led me to believe that nobody will sign off simple work because they can't guarantee that the rest of a circuit is kosher. And for example I think I could wire in the garage correctly, but I know that the connection to the house is not up to modern standards (in terms of the cable run and probably how well protected it is underground, etc.)