Full House Water Repiping
Bay Area's #1 Choice

What Is Whole House Water Repiping and When Is It Necessary?

Whole house water repiping means replacing all of a home’s supply lines – the pipes that carry hot and cold water from the main shutoff to every sink, shower, toilet, and appliance.  When the pipe system has deteriorated beyond the point where partial repairs can reliably solve the problem we recommend repiping. In South Bay Area homes, a lot of galvanized steel pipes installed before 1970, copper that has developed pinhole leaks from local water chemistry, or plastic piping from the 1980s that has since been pulled from production.

How Long Do Water Lines Last in Bay Area Homes?

Galvanized steel pipes have a functional lifespan of 40 to 70 years, but in San Jose, Santa Clara and San Mateo counties homes the timeline is often way shorter. Our water chemistry accelerates internal corrosion, narrowing the pipe bore and eventually causing rust-colored water (we call it “yellow water”) and pressure loss. Copper lasts 50 to 70 years under normal conditions, though pinhole leaks caused by the area’s moderately corrosive water supply can cut that short. Polybutylene – widely installed in San Jose and Santa Clara tract homes between 1978 and 1995 – has no useful remaining lifespan and should be replaced regardless of whether leaks have appeared, but honestly speaking we don’t see much of them.

Signs Your Home Needs Full Repiping vs. a Spot Repair

A single leak in one location where coupling or t-connection is typically a localized problem. When leaks start appearing in different areas of the home within months of each other, that’s a systemic failure – a sign the entire pipe network is at the same stage of deterioration. Other indicators of a whole-system problem: brown or rust-colored water that doesn’t clear after flushing, persistent low pressure at multiple fixtures simultaneously, and a plumbing camera inspection showing widespread corrosion, pitting, or mineral buildup inside the pipes. Spot repairs at that stage are temporary patches on a pipe system that will keep leaking.

Water Repiping Process: What to Expect From Start to Finish

The repiping process starts with a full assessment of the existing system – identifying pipe material, routing, access points, and the number of fixtures to be served. United HVAC, Plumbing & Electrical pulls the required permit before any work begins, maps the new pipe routing, and creates access at walls and ceilings only where structurally necessary. New supply lines are installed, pressure-tested, and the system is fully restored before the crew leaves. Drywall patching can be coordinated through our team or handled separately by the homeowner.

Pipe Material Options: Copper vs. PEX for Bay Area Homes

Copper is the established standard: it’s rigid, long-lasting (50+ years with proper installation), resistant to UV if exposed, and familiar to inspectors and future buyers. It costs more in both material and labor, requires soldered connections, and is less forgiving in earthquake-prone areas because rigid pipe systems transfer seismic stress at joints.

PEX (cross-linked polyethylene) is flexible, which gives it a meaningful advantage in Bay Area seismic conditions – it moves with the structure rather than cracking at fittings. It installs faster, costs less, and resists the pinhole leak problem that affects copper in certain local water conditions. PEX cannot be used outdoors or in direct sunlight, and some older buyers or lenders remain less familiar with it, though it’s fully code-compliant and widely used in new construction throughout the region.

Neither material is universally superior. The right choice depends on your home’s construction, budget, and long-term plans. We install both and will walk through the trade-offs before any work begins.

How Long Does a Full House Repipe Take?

Most single-family homes in San Jose, Belmont, or Los Altos can be fully repiped in one to three days. Larger homes with complex layouts, slab foundations requiring under-floor access, or homes with difficult wall routing may take longer.  

Water Line Repiping Cost in the Bay Area

Full house water repiping in the Bay Area typically runs between $15,000 and $25,000, depending on home size, pipe material, and access conditions. A 1,200-square-foot home with straightforward wall access and PEX piping sits toward the lower end of that range. A 2,500-square-foot home, copper pipe, and multiple bathrooms will run higher. These figures include labor, materials, and permit fees.

Factors That Affect the Final Price

Square footage and fixture count – more pipe run and more connections mean more labor hours. Pipe material – copper costs roughly 20–30% more than PEX in material and labor combined. Wall and ceiling access – open framing in an unfinished basement or garage reduces labor; finished walls and ceilings require careful cutting and patching. Foundation type – slab foundations require either tunneling or rerouting through walls, adding cost. Permit fees – required in all Bay Area jurisdictions; fees vary by city but typically range from $400 to $800.

Why Full Repiping Is Often More Cost-Effective Than Repeated Repairs

A single pipe repair in a Bay Area home averages $400 to $1500, including drywall access and patching. Homes with aging galvanized or polybutylene systems often see two to four repair calls per year as different sections fail in sequence. Over three to five years, that can easily  be totaly $6,000 to $15,000 in patchwork repairs – with no improvement to water quality, pressure, or the underlying condition of the system. A one-time repipe eliminates that cycle. And you have a new system, with all documents and added value to the property.

Why Bay Area Homeowners Choose United HVAC, Plumbing & Electrical for Full House Water Repiping

Licensed, Insured, and Local

United HVAC, Plumbing & Electrical holds current California state plumbing licenses, carries full general liability and workers’ compensation insurance, and operates exclusively in the cities of  Bay Area. Every repipe we complete is permitted through the local building department and inspected by a city or county inspector. That documentation matters when you sell your home or file an insurance claim. And we train our installers weekly. Our supervisor has 25 years of plumbing experience.

25+ Years Repiping Bay Area Homes From Slab to Ceiling

Our crews have repiped homes across San Carlos, Atherton, and Santa Clara. That range of field experience means we’ve encountered most access challenges and pipe configurations before we arrive at your home.

Copper and PEX Options With Permitted, Code-Compliant Installation

Both pipe materials we install – copper and PEX – meet current California Plumbing Code requirements and are appropriate for Bay Area seismic conditions. Permitted installation means the work is documented with the city, inspected by a third-party inspector, and recorded on the property. For homeowners in San Jose or Atherton considering resale, that paper trail is a material advantage at closing.

Ready to repipe your Bay Area home? Call United HVAC, Plumbing & Electrical (408)539-6936 for a same-day assessment and upfront, itemized quote – no obligation. We have Ben Maher or Islam our top home comfort advisors.