New construction - How high off floor should water supply lines be run in the wall?

I had to re-plumb my house after a major flood (Separate story) but I ran the 3/4" and 1" pipes through the crawl space and came up through the floor with 1/2" where the appliance was located. It is really hard to thread a 10 ft length of copper tube through the studs when the studs are 16" apart. This was in Black Hawk, CO and the crawl space stayed at about 35F even at -10F as long as there is no draft. Foam pipe insulation is easy to install.

For the wiring, you want your outlets to be no less than 10" above the finished floor (NEMA code). Run the wiring about 1 foot above the outlets so you can have the cable stapled within 6" of the receptacle box. I ran the outlets along the wall but the light switch wiring was run through the attic and down to the switch.

Through the walls is fine, and also quite common. About the same height as for the wiring that you have in the walls should be fine. To be sure though, call the building inspector and ask, that is the best way to go. Another sure fire way is to ask a plumber. You don't want to pipes to be to high in the wall, and that 10 inches or so will keep them fairly warm. If it does get to cold though, a little trickle is still a good idea. Anywhere that the pipes might be exposed to the possible threat of a nail for some other use, cover the pipe going through the studs with a metal plate, just as you have to for wiring that is within 3 inches of an interior wall. What doesn't get 'nailed' doesn't leak.

I would suggest keeping it in the floors anyhow. Electric heat tracing can be used on runs that are at risk.

I would also recommend plastic instead of copper. It is cheaper, quieter, solder free and it resists bursting if it does get frozen. Most building and plumbing suppliers carry the plastic supply pipe and the fittings for it now. You will likely save a day in labour installing it instead of copper.

Very low is the answer,but remember the plug recipticles in the walls,and to go below them is best if possible.Cover all electrical plugs and junctions with a thick plastic [totally,top and bottom+sides as is code]and insulate all pipes with offordable foam insulation.next time you renovate try newer plastic piping using pressure fittings not copper/soldering.One can avoid many 90 degree turns this way and have better water pressure throughout the whole house.

6 to 8 inches on water line to commode 18 inches for sinks electric 13 to top of box on wall outlets and 50 inches to top of box on light switches.