Published Southern California guides point to PEX jobs that start near four thousand dollars and top out around ten thousand, with copper starting near eight thousand and running well past ten thousand. Where your house lands depends on its size, bathroom count, wall or slab access and permit work. Read these as guide figures; only the plumber's written quote after seeing your house is a price. How the work runs is on the repiping a house page.
What would a 1,500 sq ft house run?
Guides for a house of that size show a wide spread, with PEX well below copper. Bigger homes, two stories with plumbing upstairs and down, and slab foundations raise the total. Guides disagree on a per-square-foot rate, so lean on the written quote.
Many tract homes in Torrance, Gardena and Lawndale fall in that size band, so the numbers are a reasonable starting point. The cheapest arrangement is a one-story house whose heater sits in the garage, since runs are short and walls open easily. A second bathroom at the far end adds length quickly.
Here is the range in one view:
| House size | PEX guide range | Copper guide range |
|---|---|---|
| Smaller, easy access | Starts near $4k | Starts near $8k |
| Average house | Several thousand dollars | Well into five figures |
| Bigger or tight access | Over $10k | Over $15k |
Sources disagree at the edges. One guide quotes Orange and Los Angeles county plumbers at up to twenty thousand dollars for a two-bedroom PEX job, so ask for a quote that itemizes labor, material, wall repair and permit.
Does cost per square foot tell you anything?
A little. Calculators and contractor guides give per-square-foot rates, but they disagree widely from one source to the next. Treat any of them as a sanity check, not a price, since fixture count and wall access matter more than floor area.
Online calculators return the middle of a wide band. Three small bathrooms can cost more than one large bath in a bigger home. Count the stubs the plumber must reach: sinks, toilets, tubs, showers, hose bibs, the washer box and the heater.
Labor is the bulk of it. Some guides put it near 70 percent, since opening, rerouting and patching walls take longer than the pipe costs. Copper adds soldering time at each joint.
How can a repipe cost less?
Choose PEX for a full job. It bends around corners, needs fewer fittings and goes in faster. Going partial costs less again: replace the failing branch or the run to one bathroom, which makes sense if the other pipe tests sound.
Other savings: take on patching and painting yourself if the quote allows, time the work with another project that has walls open, and ask whether routing through the attic or crawlspace limits drywall cuts. Keep the permit in the scope. Torrance's Building and Safety FAQ lists a plumbing permit for pipes, fixtures and water heaters, and an inspection protects you if you sell.
If the choice between materials is open, PEX versus copper compares them side by side, and what a PEX repipe costs goes into the lower-cost option in detail.
Which materials in older houses cause trouble?
Three culprits dominate. Galvanized steel corrodes inside and strangles flow. Polybutylene, a gray plastic used in houses from about the end of the 1970s through the mid 1990s, has a record of letting go at fittings. Thin-wall copper sometimes pits through. Cast iron drains tire too, though that is separate work.
Postwar tract homes across the South Bay may still have original galvanized lines, or copper that was added in the 1960s and 1970s. Warning signs: rusty water after you return from a trip, flow that has weakened slowly, and fresh leaks showing up in different spots. Our pages on galvanized pipe replacement cost and polybutylene replacement cover those materials.
For the wider question of cost in an older home, see the guide to what it takes to re-plumb an older home.
When does an old house need a repipe?
No calendar applies. Pipe wears out by material and water chemistry. Galvanized steel often needs replacing within a few decades, polybutylene is normally swapped once identified, and copper may last 50 years or more yet fail sooner where the water is aggressive.
A better trigger is performance. Two or three leaks in a year, low flow at many fixtures, discolored water, or a pinhole in copper are all reasons to get an assessment. Why repipe a house explains how to weigh a patch against a replacement.
How much to replumb a mobile home?
Mobile home plumbing is typically a smaller system, often PEX or older plastic, with lines running under the floor. We found no reliable published price for the South Bay, so we would rather say a plumber needs to see it than guess. Ask for a quote that covers belly access, insulation and the connection at the pedestal.
Our winterizing page, winterize mobile home plumbing, covers how those lines are protected.
What makes one repipe quote higher than another?
Material, size and layout, fixture count, slab versus raised floor, attic or crawlspace access, wall and ceiling repair, permit fees, and whether the old pipe gets pulled out or left inside the walls. Have each bidder list assumptions so the quotes describe the same job.
Ask too about surprises: rotted framing or a failing cast iron drain found once walls open. A solid quote states an allowance or a rule for extras before work begins. Our overview of plumber costs in Torrance puts this in context.
Common questions
What does an all-copper repipe cost?
Whole-house copper jobs in Southern California run from eight to eighteen thousand dollars by most guides, and the low end suits a smaller single-story house. Copper costs more than PEX through material price and soldering time. A partial job costs less, and the visit produces the actual figure.
PEX or copper for a repipe?
Both work. PEX is cheaper, quicker and forgiving of settling, whereas copper is the long-serving standby that shrugs off heat and sunlight. Water chemistry matters, because aggressive water attacks copper. Read your supplier's report, ask local plumbers what they prefer, and compare itemized quotes for each.
Is a permit needed in Torrance?
The city's Building and Safety FAQ lists a plumbing permit for pipes, fixtures and water heaters, so plan on one. Normally the plumber pulls it, and an inspector looks before walls close. Ask whether the quote already contains the permit fee or lists it elsewhere.
Can I do it room by room?
Yes. A partial job covers one branch, one bathroom or the worst run, often for a fraction of the price. The tradeoff: old pipe left behind may fail next. A pressure test shows how the rest is holding up before you decide.
Budget sorted? plumber torrance explains the rest of the job.
Sources used
- Published repipe price guides from Southern California plumbing businesses and cost sites, checked November 2026
- City of Torrance, Building and Safety FAQ (plumbing permits cover pipes, fixtures and water heaters)
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