I'm moving into my uncle's old house which is an absolute ruin - pretty much needs everything doing - extension, new electrics, windows, heating system etc etc. I'm looking to save as money by doing as much as I can myself. I rewired my current pad from scratch just before Part P came in and it passed a subsequent EICR with flying colours so when it comes to circuit design and SB etc, I'm pretty confident in my abilities, but I obviously need to deal with Part P and BC.
I'm well aware that no electrician will sign off an installation I've completed - it's possible I may find one that let's me do all the channeling and cable runs - essentially acting as their labourer with them overseeing and completing the job. I can imagine that would cut costs down a bit - that's if I can find one willing to do this....
Any other options I could consider?
Go round the house and think through exactly what you'd like where; sockets, lights, switches, networking. Then go around marking on the walls the minimum you want with no external electrical work unless absolutely necessary. Now get a spark round to quote for wiring using white plates etc and to over size the CU to allow for future shower, car charger, o/s lights. They'll often tot up £50 per light, £30 for a switch, £75 per socket etc then add a bit to take into account awkward layout, solid walls etc. That's your base figure. Also find out how long they'd expect the job to take.
Depending on where you are in the UK, expect £3k as a minimum, perhaps £10k as a max for a three bed. If there are a lot of local sparkies, prices are lower, if they are few and far between, prices are higher. Just now, folk are tightening their belts, to jobs aren't as plentiful as say 12 months ago.
Also, remember sparkies are trained folk trying to make a living.
So there's a base figure. Now ask yourself, if you chased and drilled to make it easier for them before they arrive on site, and assuming you know where to run wires and place fixings to comply with the regs, would you realistically save them a manday? If the answer's no, then let them do the work. They have the chaser, the experience and probably an apprentice.
Don't forget, sparkies make a mess, put in all the wiring, AND TEST to make sure it's compliant and safe.
If you've come to your senses, get another couple of quotes, pick the middle one and have the work done. At the end of it you've got the basics and you can extend rings, add o/s lights and move lights to your heart's content. Then have an EICR done if you want to check your add-ons are up to scratch.
However, if your house is an absolute ruin, you're probably well away from the wiring stage. You'd be better off insulating the hell out of the place before new heating and wiring.
Sorry, brutal I know, but if you're trying to save a few pennies, chasing walls isn't going to save you much.