Repiping a House — Materials, Costs, and the Disruption Involved
This article is for educational purposes only and is not a substitute for professional advice. Local codes, regulations, and best practices vary by region.
Repiping a house means replacing all the water supply plumbing. This is expensive at $8,000 to $25,000 or more and disruptive for one to three weeks of work. It’s only done when existing pipes are failing, not electively. Understanding when repiping is necessary and what it involves helps you prepare.
Repiping is necessary when galvanized steel pipes used before the 1980s corrode and restrict water flow, causing low water pressure, discolored water, or leaks. Pipes older than fifty or more years should be assessed, and if they’re corroding, replacement is soon. Rusty water from taps indicates pipe corrosion meaning repiping is needed. Multiple leaking pipes suggest system-wide failure. Some older homes have lead supply lines or soldered joints with lead solder that repiping removes.
A typical 1,500-square-foot house with two hundred linear feet of supply piping costs as follows: copper piping materials cost $2,000 to $4,000, PEX materials cost $1,500 to $3,000, labor costs $4,000 to $8,000, drywall patch and restoration costs $1,000 to $2,000, permits and inspection cost $300 to $600, and contingency for surprises costs $500 to $2,000. Total copper repipe is $8,000 to $16,000. Total PEX repipe is $7,000 to $15,000. Larger homes cost proportionally more. Smaller homes cost less.
Copper piping has proven durability of fifty or more years, is more expensive, has better resale value perception, is labor intensive to install, and requires soldering joints. PEX plastic is cheaper, has expected durability of forty or more years, is easier to install, requires no soldering, but has some concerns about long-term durability since it’s too new to have long-term data. PVC is very cheap but only suitable for cold water and not typically used for full repipes. Hybrid approach uses copper main lines and PEX branches to fixtures for reliability of copper with some cost savings. Most modern repiping uses PEX for cost and installation ease.
Repiping requires accessing walls and ceilings to run new pipes, creating wall and ceiling openings to access old pipes, drywall cuts that must be patched later, dust and debris, multiple days of disruption, and water service offline during work though contractors usually maintain temporary water access. It’s noisy, messy, and disruptive for one to three weeks.
Repiping a 1,500-square-foot house takes five to ten working days typically. Larger houses take two to three weeks. Smaller houses take three to five days. Work is usually 7am to 5pm, creating daytime disruption. You don’t typically need to move out. Contractors can usually maintain temporary water access or homeowners can use shower facilities elsewhere during water-off periods, but living through disruption is unpleasant.
Partial repiping is possible if only certain areas have failing pipes, costing less at $2,000 to $8,000 but not addressing system-wide issues. Water treatment helps if the problem is just rusty water but doesn’t solve structural pipe failure. Before committing to full repipe, a plumber can snake a camera through pipes to assess condition at cost of $300 to $500, telling you if repipe is truly necessary.
Repiping requires permits in most jurisdictions with inspectors verifying work meets code at cost of $200 to $400. All work must be by licensed plumbers—you can’t DIY. Get multiple bids ensuring same scope with same pipe material for full house. Ask about water pressure after repiping which should be fifty to eighty psi. Verify license and insurance. Ask about warranty which is typically one to two year labor warranty. Get detailed scope in writing specifying which pipes are being replaced and what material.
Sometimes the water main (line from street to house) also needs replacement, separate but often done with house repiping. Water main replacement costs $2,000 to $10,000 depending on length and depth. Water main work often requires excavation and street access, making it more expensive.
Repiping makes sense when pipes are actually failing not just old, multiple leaks or low pressure indicate system-wide problems, or water quality is compromised with rusty or discolored water.
Repiping doesn’t make sense when pipes are old but functioning fine with no pressure problems or discoloration, single leaks can be repaired instead of full repipe, or homes are not going to be kept long-term since this is expensive investment.
New pipes require minimal maintenance with no flushing or treatment needed and valves needing only occasional lubrication if stiff. Systems are relatively trouble-free for decades.
Repiping is major expense and disruption but sometimes necessary. If your home has failing pipes, repiping is the only real solution. Planning for it when pipes begin showing signs of failure is better than emergency repiping when a major leak occurs.
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