How Much Does It Cost to Repipe a House in Los Angeles?
A whole-house repipe in Los Angeles typically costs $6,000–$16,000 with PEX, and the citywide average lands around $8,500. Copper roughly doubles the material cost — $10–$12 per square foot installed versus $4.50–$6 for PEX — and pushes larger homes past $20,000. The plumbing work itself takes 3–7 days, but that price usually does not include patching the drywall afterward, which adds $300–$1,500 or more. If your home was built before about 1970 and still has its original galvanized-steel pipes, low pressure and rusty water are the classic signs the repipe is due.
If your Los Angeles home was built before about 1970 and nobody has replaced the plumbing, odds are you are living with original galvanized-steel supply pipes — and they are at or past the end of their design life. Repiping is one of the least glamorous projects a homeowner can buy, and one of the highest-value ones: it fixes water pressure, water color, and the slow leaks that quietly destroy framing.
Here is what it actually costs in Los Angeles, and where the money goes. These are typical Los Angeles market ranges, not a quote.
The numbers
| Item | Typical LA range |
|---|---|
| Whole-house repipe, PEX | $6,000–$16,000 |
| Whole-house repipe, copper | $12,000–$25,000+ |
| Citywide average (all projects) | ~$8,500 |
| Materials: PEX installed | $4.50–$6 per sq ft |
| Materials: copper installed | $10–$12 per sq ft |
| LADBS plumbing permit | roughly $50–$800 |
| Drywall patch and paint after | $300–$1,500+ |
| Working time | 3–7 days |
The spread is driven by four things: the size of the house, the number of fixtures (every sink, toilet, tub, and hose bib is a run), how accessible the pipes are (a raised foundation with a crawl space is cheaper to repipe than a slab), and the material you pick.
Why pre-1970 houses are the repipe belt
Galvanized steel was the standard supply pipe in Los Angeles homes into the 1960s. It corrodes from the inside out: rust narrows the pipe bore over decades, which is why the shower goes weak when someone opens a faucet, and why the water runs brown after a vacation. By the time those symptoms show, the pipe walls are thin — and the failure mode is a pinhole leak inside a wall.
Galvanized supply pipe sits near the top of the list of what we find in 1950s San Fernando Valley homes, alongside 100-amp panels and mid-century wiring. If you are opening walls for a remodel anyway, that is the cheapest moment a repipe will ever have.
PEX changed the math
Twenty years ago a repipe meant copper, a torch, and a lot of drywall cuts. PEX — cross-linked polyethylene — changed that. It is flexible, so installers pull it through walls and joists with far fewer openings; it installs faster, so labor drops; and the material itself costs a fraction of copper, whose price tracks global commodity markets. That is how PEX lands at roughly half the installed cost of copper in LA.
Copper's remaining case: decades of proven service, rodent resistance, and preference for exposed locations. Plenty of LA repipes split the difference — copper stub-outs and exposed runs, PEX everywhere hidden.
The two line items people forget
The permit. A repipe needs an LADBS plumbing permit and an inspection before walls close. Like-for-like repipes usually go express — no plan check, no long wait. Skipping the permit saves little and creates a resale problem later.
The drywall. Most plumbing quotes end when the water runs. Patching, texture-matching, and painting the openings is often excluded — ask every bidder. It is a $300–$1,500+ item on a typical job and the most common reason two "identical" bids are not identical.
When a repipe belongs inside a bigger project
A repipe on its own makes sense when pipes are failing now. But if a bathroom remodel or a whole-home renovation is on your horizon, fold the repipe into it — the walls are already open, the trades are already there, and you pay for the drywall repair once instead of twice. It is one of the clearest sequencing wins in residential construction: pipes before finishes, always.
Questions
PEX or copper — which should you choose in Los Angeles?
For most LA repipes, PEX wins on price and practicality. It runs $4.50–$6 per square foot installed versus $10–$12 for copper, it snakes through walls with far fewer cuts (so less drywall repair), and it tolerates minor ground movement better — not a small thing in earthquake country. Copper still makes sense for exposed runs, some high-heat applications, and buyers who want the longest track record. Both are fully code-approved in Los Angeles.
Do you need a permit to repipe a house in LA?
Yes. A whole-house repipe in the City of Los Angeles requires a plumbing permit from LADBS, and the work gets inspected before the walls close up. The good news is that a like-for-like repipe usually qualifies for an express or over-the-counter permit — no plan check — so the permit itself costs tens to a few hundred dollars and does not add weeks to the schedule. Unpermitted plumbing is one of the most common problems we find behind walls during remodels, and it surfaces at resale.
Can you live in the house during a repipe?
Usually yes. Crews work section by section, and water is typically off only during working hours, restored each evening. A typical single-family repipe takes 3–7 days. The disruptive part is the wall openings — expect cut drywall in bathrooms, the kitchen, and along pipe runs until patching is done.
Does the repipe quote include fixing the walls?
Often not — and this is the line item that surprises people. Many plumbing contractors quote the pipe work only and leave drywall patching, texture matching, and paint to you. Budget $300–$1,500+ for patching on a typical repipe, more if finishes are high-end. Ask every bidder directly whether wall repair is included; it is the most common gap between two bids that look identical.