Hey V8ghia,

Very hard to put an exact price down, as there is no definite way to tell without seeing a layout of the place, how much cabling needs to be replaced, how hard it is to get to the outlets/lights/hotwater etc. Im a sparky in brissy, and we charge 77 an hour (roughly) plus all your materials, just as a general idea of prices.

The only thing i can think of is to get several quotes, and watch out for any that are too narrow in their specs, or have three pages full of disclaimers (eg "no allowance made for blah blah") as they may try to pull extra money out of you with variations

Be great to hear from you as to how much it all ends up being, with any luck it'll be one of those easy jobs where everything just goes easy (they do happen, and theres no better feeling than a seemingly hard job going smoothly)