Repiping 101: When Old Pipes Need to Be Replaced

If your home is older than 50 years and still has its original supply pipes, you're already on borrowed time. Here's how to tell when repiping is the right call — and what to actually expect from the job.

The signs your home needs a repipe

• Brown or rusty water from one or more fixtures, especially after the house has sat unused for a few hours.
• Low water pressure on multiple fixtures — corrosion narrows the inside of old galvanized pipe like cholesterol in an artery.
• Repeated pinhole leaks — one is bad luck, three in a year means the whole system is failing.
• Visible green or white crust on copper fittings — that's active corrosion.
• Banging pipes (water hammer) that nothing seems to fix.
• Hot and cold backwards or mixed when only one fixture is on — usually a pinhole crossover inside a slab line.
• Built before 1970 with original galvanized supply lines — past the end of its design life, full stop.

PEX vs. copper: which to repipe with

PEX is flexible cross-linked polyethylene. Faster to install, fewer joints inside walls, freeze-resistant, 20–30% cheaper than copper, and carries a 25-year manufacturer warranty. It's what we recommend for most Norwalk-area repipes in 2026.

Copper has a 50+ year track record, doesn't permeate, and is preferred for exposed runs and certain commercial applications. Costs more in material and labor.

Both are fully code-compliant in California. There's no wrong answer — we'll quote both on request.

What a repipe actually costs in 2026

Installed, permitted, with patching:

• Single-story, 2-bath, ~1,500 sqft (PEX): $4,800 – $7,500
• Single-story, 3-bath, ~2,000 sqft (PEX): $6,500 – $9,500
• Two-story, 3-bath (PEX): $8,500 – $13,500
• Copper instead of PEX: add 25–40%

What moves the number: number of fixtures, slab vs. attic-routing, wall finish (drywall vs. plaster vs. tile), and whether the existing main and gas lines need work at the same time.

What to expect during the job

• Day 1: Walkthrough, mark every fixture, lay drop cloths, cut access openings (we make as few as possible — usually one per wall section).
• Days 2–3: Run new PEX, replace stops at each fixture, connect to water heater and main.
• Day 3 or 4: Pressure-test, inspector signs off, drywall patches.
• Day 4 or 5: Texture and prime patches (paint is usually handled by a painter or by the homeowner).

You'll be without water for 4–8 hours on one of the install days. Everything else, you can stay in the home.

The mistake we see most often

Homeowners chase pinhole leaks one at a time for years, spending $300–$600 each time. By the time they add it up, they've paid for a full repipe twice over and still have failing pipes. If you've had two leaks in 18 months on an older home, get a repipe quote.

Get a written repipe quote

Free in-home estimates across Norwalk, Downey, Cerritos, Bellflower, Lakewood, Long Beach, Whittier, La Mirada, Pico Rivera, La Habra, and Buena Park. Call (562) 521-4995 or visit our pipe repair & replacement page. Read real customer experiences on our Google Business Profile — and if we've helped you, please leave a review.