You will save a considerable amount of money on both materials and labor if you can plan your addition or remodel design in a way that keeps bathrooms, kitchens and laundry rooms either side-by-side or above-and-below where they can share major supply pipes, drains, ducts, and vents. Not only will this kind of design save on installation for your remodel or addition, it will require less modification of the existing home to make the connections and to run new pipes, vents and drains. Positioning a kitchen, bathroom or laundry room some distance from existing drains, supply lines and vents will either require the installation of new drains, lines and vents, or it will require the installation of connecting pipe. Depending upon the amount of disruption this causes in other parts of the house, the cost could rise very quickly.

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Locate heating and cooling equipment centrally in the home
Insulate pipes to reduce cooling of water as it moves from the water heater through the pipes to the faucet
Use ventilation fans in bathrooms and laundry rooms to control moisture