Question: how much does it cost to add plumbing?
Answer: Rough in Plumbing Costs for a New Construction Rough in costs range anywhere from $7,000 to $15,000 for an average size home of roughly 2,300 square feet with 2 or 3 bathrooms. It is $600 to $1,600 per fixture with final costs ranging from $1,500 to $20,000.