What this page answers
- How to tell if your home needs a repipe
- Differences between copper and PEX
- What a repipe project actually involves
- Whether a partial repipe makes sense
- How permits and inspections work
About repiping
Repiping is the replacement of a home's water supply piping — the pressurized hot and cold lines running from the main to every fixture. It does not include drain lines (that's separate work). The most common driver in San Jose is failing galvanized steel supply piping in homes built before the 1970s.
Modern replacements use either type-L copper or PEX (cross-linked polyethylene). Both are code-approved. The right choice depends on the routing, the access, the acoustics, and the budget.
Common signs you need repiping
- Rust-colored water at first draw, especially hot
- Low water pressure that has gotten worse over years
- Multiple pinhole leaks in copper over recent months
- Metallic taste at the tap
- Discoloration on porcelain fixtures from mineral flow
- Original galvanized supply visible in the crawlspace or garage
- Home built before 1970 with no prior repipe on record
- Uneven pressure between fixtures far from the main
When should you call a plumber?
Call for an assessment if you're consistently dealing with any of the signs above — especially repeat leaks or worsening pressure. Repiping is planned work; catching it before a failure gives you the best cost and scheduling options.
If a leak has already happened and the pipe is at end-of-life, we can stabilize the emergency and then plan the repipe on a realistic timeline, not under crisis.
What happens during a service visit?
We start with an assessment: pipe material, layout, access, pressure test, and a walk of every fixture. That produces a written repipe plan showing routing, wall openings required, material choice, and timeline.
On execution, we work in a planned sequence to minimize water-off time. Most single-family repipes complete in 2–4 days for the plumbing portion, followed by drywall patching. The system gets pressure-tested and inspected before we close anything up.
What we check on-site
✓ CA Lic #1087742The diagnostic steps a licensed plumber takes before scoping any repiping work.
- 1Existing pipe material, age, and observed failure pattern
- 2Static and dynamic pressure at multiple fixtures
- 3Routing options (attic, crawlspace, wall runs) for minimum invasion
- 4Access and required wall openings for each option
- 5Copper vs. PEX suitability for your house
- 6Main shutoff, pressure regulator, and shutoffs at each fixture
- 7Water heater connection condition and expansion tank
- 8Permit requirements for your city and any inspection sequencing
- CA Lic #1087742
- Licensed & Insured
- 20+ Years Trade Experience
- Residential & Commercial
- 24/7 Emergency Service
Local context — San Jose & Santa Clara County
Whole neighborhoods in San Jose built in the 1950s–early 1970s — parts of Willow Glen, Cambrian, Alum Rock, Naglee Park — were plumbed with galvanized steel. That pipe is now well past service life. If you own a house from that era and haven't repiped, plan for it. The good news: repipes in this housing stock are well-understood and go efficiently.
Newer construction (mid-1980s and later) is more often copper or PEX and typically doesn't need whole-house repiping unless specific runs have failed.
Plumbing Terms Explained
- Repiping
- Replacement of a home's water supply piping — the pressurized hot and cold lines feeding every fixture.
- Galvanized pipe
- Steel pipe coated with a zinc layer. Common in mid-century construction. Corrodes internally over decades, causing low pressure, rusty water, and eventual leaks.
- Copper piping
- Traditional supply pipe material. Long-lasting when installed correctly, with rigid runs joined by soldered or press fittings.
- PEX
- Flexible cross-linked polyethylene tubing. Fewer joints than copper, easier routing through existing structures, quieter, and freeze-resistant. Widely used in modern repipes.
Homeowner guidance
Questions to ask
- Copper or PEX, and why for my specific house?
- How many wall openings will this actually need?
- What's the water-off schedule and how are you sequencing the work?
What affects the job
- House size, number of bathrooms, and fixture count
- Access — crawlspace, slab, single vs. two-story
- Whether the water heater and main shutoff also need work
Don't attempt yourself
- Trying to patch a fifth pinhole leak instead of planning a repipe
- Buying materials yourself — code-compliant material selection matters
- Skipping the permit — hurts future sale and insurance