5 Signs Your Home Needs a Repipe (And What to Expect)

A repipe is a real project — usually two to four days, drywall patches included — but for the right house it's the fix that ends a decade of small leaks, brown water, and weak showers. Most of the Central Coast homes we repipe were built between the 1950s and the early 1980s and still have galvanized steel supply lines or early polybutylene. Both have a hard ceiling on how long they last in our water. Here's how to tell where your house sits.

What are the signs a house needs to be repiped?

The five signs are persistently low water pressure throughout the house, rusty or discolored hot water, more than one leak in the last twelve months, visible pinhole corrosion on exposed pipe, and a water bill that jumped with no change in usage. Two or more together usually means the pipe itself has failed, not the fittings.

• Low pressure everywhere — not one fixture. Galvanized pipe corrodes inward; a 3/4" line can neck down to the diameter of a pencil.
• Discolored water, especially hot, especially after the house sits unused for a day.
• Repeat leaks. One leak is bad luck. Three in a year is a pattern.
• Pinholes on exposed copper in the garage or crawlspace — usually a sign of aggressive water or stray current, and rarely isolated.
• A water bill spike with no usage change, which often means a slab or wall leak you can't see yet.

Any one of those can be addressed in isolation. Two or more in the same house means you're paying for repairs on a system that is going to keep failing, and the repair money would be better spent on the replacement.

Which pipe materials fail early on the Central Coast?

Galvanized steel and polybutylene are the two we replace most. Galvanized was standard in local homes into the 1960s; the zinc coating erodes and the steel underneath rusts and restricts. Polybutylene, common in late-1970s and 1980s construction, degrades from the inside and fails at the fittings — often with no warning at all. Early-generation copper in areas with aggressive water develops pinholes.

If you know your build year, you can guess your material with decent accuracy, but we'd rather look. A ten-minute crawlspace or attic check tells us the material, the condition, and whether previous owners already partially repiped — which is common and changes the scope.

Is PEX or copper better for a repipe?

We install PEX-A in almost every residential repipe now. It's flexible, freeze-tolerant, resistant to the mineral content in our water, code-compliant in San Luis Obispo and Santa Barbara Counties, and it can be routed through wall cavities and attics with far fewer drywall openings than rigid pipe. That last point matters: fewer openings means less patching, less paint, and a shorter job.

Copper is still the right answer in specific situations — exposed runs where appearance matters, some commercial applications, and jurisdictions or HOAs with material requirements. It costs more in both material and labor. We'll quote either, and we'll tell you plainly when copper is worth the premium and when it isn't.

How much does a whole-house repipe cost on the Central Coast?

A typical single-family repipe on the Central Coast runs $9,000–$18,000, including permits, pressure testing, inspection, and coordinated drywall patching. Price is driven by fixture count, one story versus two, and whether the home is on a slab or a crawlspace. Slab homes cost more because lines get rerouted overhead instead of underneath.

What that number should always include: a written scope, the permit, a pressure test documented for the inspector, new angle stops at every fixture, a labeled manifold or shutoff arrangement, and drywall patched to a paint-ready finish. If a quote is meaningfully cheaper than the range above, check which of those items got left out.

How long does a repipe take and can I stay in the house?

Most single-story three-bedroom repipes take two to three days, and two-story homes take three to four. You can stay in the house. Water is shut off during working hours only and restored each evening, and we sequence the work so at least one bathroom returns to service every night.

Day one is access and rough-in: small, planned drywall openings at fixtures and a new distribution run through the attic or crawlspace. Day two is tie-ins and the pressure test. Inspection follows, then patching. We coordinate the drywall finisher directly so you're not project-managing two trades.

What if I'm not ready for a full repipe yet?

Then we repair, document, and plan. There's no rule that says the whole system has to go at once. On some homes the sensible move is repiping the hot side or a single bath group now and the rest at remodel time. We'll give you both numbers in writing — the targeted repair and the full repipe — so the decision is yours with real figures in front of you.

If you're seeing two or more of the signs above, get an honest assessment. We inspect for free across San Luis Obispo and northern Santa Barbara County and quote repair and full repipe side by side. Call (805) 788-8444.