Whole-House Repiping in the South Bay

Torrance, San Pedro, Harbor City, and the older parts of Redondo Beach were built out heavily between the 1950s and the early 1970s, and that construction was plumbed in galvanized steel. Fifty to seventy years is well past what that material was ever going to give.

The thin-wall copper that succeeded it has its own failure mode — pitting through from the inside, which produces the pinhole leaks that show up as a ceiling stain long after the pipe started failing. Houses that were partially repiped in the 1990s frequently have a mix: a section of newer copper, a section of original galvanized, and a joint between them where dissimilar metals accelerate the corrosion further.

Part of scoping a repipe honestly is opening enough of the wall to find out what is actually in there, rather than assuming from the year the house was built.

Both are code-legal in California, and both will comfortably outlast the material being removed. The choice is about the specific house.

PEX runs in long continuous lengths with far fewer joints, which matters because joints are where systems fail. It flexes through tight framing, and it is the more practical answer on a slab foundation where routing has to go up and over through the attic. Type L copper is the traditional specification, tolerates high heat, and some owners simply prefer it — including for how it reads to a buyer at resale.

We make a recommendation based on foundation type, routing access, and your horizon on the property. We do not have a house rule, and any contractor who insists there is only one right answer is telling you about their preferred install, not about your building.

Nobody can price a repipe properly without walking the house, but you deserve orientation before you start collecting bids.

As a general range for a typical three-bedroom South Bay home, PEX repipes commonly land somewhere around $4,000–$8,000 and copper around $10,000–$20,000. The main driver is fixture count — roughly $650–$1,500 per fixture — followed by access, foundation type, and how much wall has to come out to route the new lines.

What moves a quote more than the pipe material is what the quote leaves out. Three items get excluded routinely: the permit, the drywall patching and texture, and the water main between the meter and the house, which is a separate run and sometimes also at the end of its life. A bid that omits patching is not comparable to one that includes it, and the difference is rarely small. Ours includes the permit and paint-ready patching.

LA County Code Title 28 requires a permit to replace water piping, and the South Bay cities enforce it. We pull the permit and carry the rough and final inspections.

The rough inspection is the one that counts, because it happens while the lines are still visible. Once drywall closes, nobody can see what was done. A contractor who wants to skip the permit is proposing that the only inspection of the work be the one they perform on themselves.

The practical consequence lands at sale. Unpermitted plumbing work surfaces during escrow with reliable regularity, and resolving it retroactively — sometimes by reopening finished walls — costs considerably more than permitting it would have.

Torrance moved to fully digital plan and permit submittal in January 2026. Larger scopes can draw a plan check rather than an over-the-counter permit, which is a scheduling consideration we build into the timeline rather than discovering mid-job.

Most single-family repipes run three to five working days on the pipe work. Water is off during working hours and restored each evening on all but one or two days, and we sequence so a bathroom and the kitchen come back first.

Multifamily is a different exercise. Buildings stay occupied, so work runs riser by riser with written notice to affected units, water-off windows that tenants can plan around, and enough of the building live at any time that nobody goes a day without service. If you manage a South Bay apartment building, see our commercial repipe page for how that sequencing works.