Cost of Repiping a Home in Orange County (2026 Guide)

A whole-home repipe replaces the water supply lines (the pipes bringing clean water to the fixtures), and it is a different job from a sewer replacement, which handles what leaves. We do not publish a figure, because the number is set by things that can only be seen in your house. Here is what those things are.

What drives the number

The count of fixtures, not the square footage, because each one is a termination. Whether the house is single or two storey, since a second floor means more vertical runs and more drywall opened. Slab or raised foundation. Whether the existing runs are accessible through an attic or a crawlspace, or buried in the slab. And the material chosen.

Copper or PEX

Both meet code in California. PEX is faster to install, needs far fewer joints inside walls, tolerates the water chemistry here well and flexes rather than splitting if a line ever freezes. Copper is rigid, familiar, and is what many owners still prefer for exposed runs in a garage or under a sink. The price difference is real but it is rarely the deciding factor: access usually matters more.

Why galvanized houses end up here

Homes built before the early 1980s in Orange County often still have original galvanized steel supply lines. Galvanized corrodes from the inside: the bore closes, pressure drops at the furthest fixtures first, and the water comes out with a rusty tinge after the house has been empty a few days. Patching one section moves the failure to the next section, which is why a series of small repairs on galvanized is usually the most expensive way to reach a repipe.

Drywall, and who repairs it

A repipe means opening walls, and the finish work is frequently where quotes diverge. Ask explicitly whether patching, texture matching and paint are included, or whether the job ends at bare drywall. Neither answer is wrong, but comparing a quote that includes it with one that does not is comparing two different jobs.

Permit and pressure test

A repipe is permitted and inspected work. The system is pressure tested before the walls close, and that test is the thing worth witnessing. We pull the permit, close it, and back the work in writing.

Where people live while it happens

Most repipes are done with the household in place. Water is off during working hours and back on each evening, and the bathrooms are staged so at least one stays usable. Ask how the sequencing will work before you commit; a quote that assumes you will move out for a week is a different proposition from one that does not, and the assumption is rarely stated.