How Much Does Repiping a House Cost in LA County? (2026 Guide)

Galvanized steel pipe was commonly used for drinking water lines before the 1960s, so a home built before then may still have it. Galvanized pipe is iron or steel with a protective zinc coating. Once the zinc wears away, the pipe rusts, and lumps of corrosion can form inside it, narrowing the pipe and blocking flow, according to the East Bay Municipal Utility District. The result is low water pressure, discolored water, and eventually leaks.

Whole-house repiping replaces the water supply lines in your walls with new pipe. It is a major project, but it is the permanent fix for those problems.

Typical Repiping Costs

Job	Typical estimated range
Spot repair (one damaged section, 1 to 3 feet)	$200 to $600
Partial repipe (supply lines to one bathroom or kitchen)	$1,500 to $4,000
Whole-house repipe, 2-bathroom home	$4,000 to $8,000
Whole-house repipe, 3 or more bathrooms	$7,000 to $15,000

These are typical estimated ranges for licensed plumbers in LA and Orange County, not quotes. Where a job lands depends on the pipe material, the number of fixtures, how easy the pipes are to reach, and how much wall opening and patching is included. See pipe repair and repiping for more.

PEX vs. Copper

The two main options are PEX and copper.

PEX is flexible tubing made from cross-linked polyethylene. It does not rust, bends around corners with fewer fittings, and usually goes in faster, which keeps labor costs down. Copper is rigid metal pipe joined with soldered or press fittings. It has a long track record but typically costs more for both material and labor.

Both last for decades when installed correctly. For most homeowners, the deciding factors are price, the installer's experience with the material, and how much wall access the job needs. If you prefer one material, say so up front so the quotes are comparable.

What a Repipe Quote Should Cover

Ask for a written scope of work that spells out:

• Which lines are replaced. A repipe covers the water supply lines, not the drain lines.
• How walls will be opened and how much patching is included. Finished drywall and paint are often separate.
• Whether new shutoff valves are included at the main and at each fixture, such as toilets, sinks, and the washing machine.
• Pressure testing of the new system.
• The plumbing permit and inspection.
• What is excluded, such as water heater replacement or work on fixtures and appliances.

A repipe needs a plumbing permit and inspection. In the City of Los Angeles, for example, LADBS requires a plumbing permit for any installation or modification of potable water piping. Other cities, and unincorporated areas served by the county, run their own permit offices.

Signs You Need a Repipe

Not every older home needs a full repipe. These are the signs that yours might.

Rust-colored or discolored water. If the water runs brown or orange when you first open a tap, especially after the house has sat empty, corroded galvanized pipe is a likely cause. Recurring leaks. You fix one leak, and months later another appears somewhere else. That pattern points to pipe failing throughout the house, and patching one spot at a time rarely ends it. Low pressure everywhere. Weak pressure at every fixture, not just one, suggests corrosion is narrowing the pipes. Several leaks at once. Leaks in two or three places at the same time are a red flag that a repipe is urgent. Your insurer asks about it. Some insurers ask about the age and material of the plumbing in older homes. If yours raises it, have the pipes inspected. You are planning a remodel. If walls are already open for a kitchen or bathroom project, repiping at the same time saves opening them twice.

Paying for a Repipe

Some contractors offer payment plans through third-party lenders. Compare the rate and terms with other financing before you sign.

California law also limits what you pay up front. According to the Contractors State License Board, a written contract is required for home improvement jobs over $500, the down payment cannot be more than $1,000 or 10% of the contract price (whichever is less), and payments cannot run ahead of the work completed.

If your pipes are clearly failing, waiting risks water damage inside walls and ceilings.

Getting Estimates

Get written estimates from two or three licensed plumbers. Each one should state the pipe material, what is and is not included, and who handles the permit and inspections. Check each contractor's license on the CSLB website before you sign.

Not sure what you are looking at? Upload a photo to PlumberNearMe.ai for a free AI diagnosis and a typical cost range.

Sources

• East Bay Municipal Utility District: Galvanized iron pipes
• Los Angeles Department of Building and Safety: Plumbing permits
• CSLB: What is a contract? (home improvement contracts)
• CSLB: Check a contractor license