Re: What to do first?

I'm no expert, but as far as I remember when our house is build electrical and water piping is done before ceiling and wall finish, although our is concrete covered with thick wall paper.

I think the electrical should be done by a qualified personnel. Ceiling and dry wall can be DIY if you prefer too.

Re: What to do first?

Ditto on Boggieman's comment.

Wiring conduits and plumbing would normally be installed between drywall and outer wall, or embedded into the concrete itself so best to plan/install them early. Don't you have them at all in the "bare" house?

Re: What to do first?

Plumbing first: ensuring no leaks that can mess with electricals, finishes, etc.
Electricals second, and so on.

You might get away with DIY'ing water supply piping, but waste/soil piping takes
some training. A 2% downward slope ensures waste is drained away: less slope
slows the drainage and can lead to backflow; more slope means liquid drains too
fast, potentially leaving solids behind in the pipe (blockage). There's also the art/
science of relief vents to prevent back-pressure: someone flushes a toilet on the
second floor, which then compresses the air inside the soil pipe below, potentially
pushing whatever's in the toilet bowls below, explosively (and grossly) out. I do
not know if it's still published, but Max Fajardo's "Plumbing Design & Estimate" is
a pretty good and inexpensive guide for a DIY plumber --allot two days, to read
through the whole book TWICE.

Electricals are actually more straightforward: know a circuit's load, and you will
know the minimum wire gauge and then the circuit breaker rating (knowing all
the circuit runs and wire gauges gives you conduit sizing). Get your electricals
wrong, however, and the consequences are much worse than in bad plumbing.
I've seen DIY'ers size their conduits wrong, then as a result, have to pull way
too hard on the wires to get them through, potentially compromising the wire
insulation (with obviously gangerous consequences later). I've seen even very
experienced DIY'ers size their breakers inappropriately: if a breaker is too 'small',
it will trip with annoying frequency, but if it is too 'large', it won't trip even if the
wires (and the house) have started to burn. An electrical engineer would be best
for designing your electricals, and then electrician ang mag-implement ng actual
wiring. If there's nothing unusual about the loads inyour house, you can maybe
get away with having a GOOD electrician do it all...
but that'd be your call, and definitely not mine.

Re: What to do first?

Draw a plan first and know what goes to where. Building as you go is simple but you might end up doing things twice only to find you have to redo it again in another location.
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