23 Plumbing, Electrical and Heating Six: Plumbing When planning for your concrete foundation, the best idea is to rough in ahead of time and have the ability to come through the foundation if you plan on a permanent structure. Many customers choose to at least bring the PVC pipe through ahead of time so that you can plumb or wire it after the fact. Consult your plumber and electrician to double check before pouring your foundation. For wood foundations, it is fairly common to come through under the wood after it’s constructed.