Whole-House Repipe Cost in California
A whole-house repipe in California typically costs $9,000–$15,000 with PEX — but Orange County's September-2026 actuals run higher: $13,000–$18,000, with roughly $15,800 as the typical job. Copper adds about 55% on top ($26,000–$32,000 on larger homes). The swing factors: pipe material, home size, and whether the house sits on a slab or a raised foundation — a 15–25% difference.
Orange County, CA · Updated 2026 · Costs shown as ranges — your quote will vary by contractor and scope
What a repipe actually includes
A repipe replaces the supply lines — hot and cold water to every fixture — not the drains. The plumber runs new pipe through walls and ceilings, ties into the water main and the water heater, installs new valves and fixture shutoffs, and pressure-tests the system. Drywall patching and paint are usually excluded or a separate line item; the patch crew follows the pipe crew.
The trigger is usually age or symptoms: galvanized steel past 40–50 years, copper with pinhole leaks, or chronic low pressure from scale. A house that springs two or three leaks in a year is past the repair stage — each patch buys months, and the plumber's trip charges add up. Repipe jobs take 2–5 days of pipe work for a typical single-family home, plus the patch phase.
PEX vs. copper: the price table that decides the budget
PEX (cross-linked polyethylene) is the standard now: flexible tubing snaked through walls with fewer fittings, corrosion-proof, freeze-tolerant, and roughly half the installed price of copper. California's typical $9,000–$15,000 repipe band is a PEX number. Copper is the legacy premium: soldered rigid pipe, proven 50+ year life, but slower to install and exposed to copper-price swings — copper adds roughly 55% to the PEX price.
The honest comparison is price plus disruption. PEX's flexibility means fewer wall openings — the patch phase shrinks with the pipe time. Copper needs straighter runs and more openings, more labor, more patch. The PEX-vs-copper table below prices both for a typical home; on larger OC homes, copper's roughly 55% premium takes a $17,000 PEX job to $26,000–$32,000.
Slab vs. raised: the 15–25% swing
Houses on a raised foundation are the easy repipe: the crawlspace gives the plumber access to run the main lines underneath, so the walls see fewer openings and the job goes faster. Slab homes are the opposite — the original pipes are buried in the concrete, so the repipe runs new lines through walls and ceilings instead, with more openings and more patch. The slab-vs-raised swing is roughly 15–25% of the job price.
OC's slab-heavy 1950s–1970s neighborhoods feel this directly: the September-2026 actuals of $13,000–$18,000 reflect a lot of slab homes. Multi-story homes add another wrinkle — more fixtures, longer runs, and harder access to upper-floor bathrooms. A two-story slab home is the hardest standard case; a single-story raised home is the easiest.
Reading the quote: what's missing from the low bid
The low bid usually omits one of three things: drywall patching (often $1,500–$4,000 as a separate phase), permit and inspection fees, or the water heater reconnect details. A PEX quote that seems impossibly cheap next to copper quotes is usually a PEX-vs-copper material difference, not a bargain — confirm the material in writing. And confirm fixture count: the price scales with fixtures, so a quote for a 2-bath house tells you nothing about your 4-bath.
Ask for the same line items from every bidder: material (PEX type and brand, or copper grade), fixture count covered, main-line and water-heater tie-in, permit and inspection, patching (included or separate), and warranty terms on workmanship. Three itemized quotes on the same scope is the only comparison that works. The typical OC job lands near $15,800 — a quote far below that needs an explanation, not a signature.
Whole-house repipe pricing, California (2026)
| Item | Typical range |
|---|---|
| CA typical (PEX) | $9,000 – $15,000 |
| OC Sept-2026 actuals (PEX) | $13,000 – $18,000 |
| OC typical job | ≈$15,800 |
| Copper premium | ≈ +55% |
| Large home, copper | $26,000 – $32,000 |
| Drywall patching (often separate) | $1,500 – $4,000 |
| Permit + inspection | $300 – $800 |
| Slab-vs-raised swing | 15–25% of job price |
DIY vs. hiring a pro
Running the pipe is licensed work — but owners routinely save on the patch phase. Moving furniture and clearing wall access yourself, patching and painting the drywall openings after the pipe crew leaves, and re-caulking the fixture shutoffs are all fair DIY. The pipe itself stays with the plumber; the cosmetics are yours if you want them.
What drives the price up or down
- Pipe material — PEX vs. copper (≈55% premium)
- Foundation — slab vs. raised (15–25% swing)
- Home size and fixtures — run length and bath count
- Stories — multi-story adds access complexity
- Patch scope — included or a separate phase
- Market — OC actuals run above the CA band
How to keep the cost down
- Confirm the pipe material in writing (PEX vs. copper)
- Compare three itemized quotes on identical scope
- Price the patch phase separately — it's often excluded
- Count fixtures — quotes scale with bath count
- Ask what's included: main tie-in, heater, permits
- Treat a far-below-average quote as a question, not a deal
Frequently asked questions
How much does a whole-house repipe cost in California?
$9,000–$15,000 with PEX statewide. Orange County actuals (September 2026) run $13,000–$18,000, with roughly $15,800 as the typical job. Copper adds about 55% — $26,000–$32,000 on larger homes.
PEX vs. copper: which is better for a repipe?
PEX wins on price and installation speed — flexible, corrosion-proof, roughly half the installed cost. Copper is the proven premium with 50+ year life but roughly 55% more cost and more wall openings. Most California repipes are PEX.
How long does a repipe take?
2–5 days of pipe work for a typical single-family home, plus the drywall patch phase. Copper jobs run longer than PEX on the same house.
Is a repipe more expensive on a slab foundation?
Yes — roughly 15–25% more. Slab homes need new runs through walls and ceilings (original pipes are buried in concrete), with more openings and patching than a raised-foundation crawlspace allows.
Does a repipe include drywall repair?
Often not — patching is frequently a separate phase ($1,500–$4,000). Confirm in writing whether patching is included, and price it separately if not. Many owners DIY the patch and paint.