The Repipe Decision: When Patching Stops Paying

There is a version of this decision that makes itself. The grey plastic supply line — polybutylene, installed across the Valley roughly between 1978 and 1995 — fails at its fittings without warning, and insurers have long since done their own arithmetic on it. If your walls hold grey pipe, the question is not whether but when, and preferably before the when is a ceiling.

Most homes face a slower version. A pinhole in the copper this spring. Another behind the laundry in the fall. Each repair around $800, each reasonable, each accompanied by the plumber’s quiet observation that the rest of the run looks like the part that failed.

The arithmetic of the pattern

One leak is an event. Two on the same system inside two years is data. The conditions that made the first pinhole — water chemistry, installation-era flux, a hot recirculation loop — exist along the whole run. Copper does not develop one pinhole out of spite; it develops the first of several.

So the honest comparison is not “$800 repair versus $10,000 repipe.” It is the next several years of repairs, plus the damage each one causes before discovery, plus the pressure and rust-water problems that never quite go away — versus ending the category once.

• Repeat repairs: $800 each, arriving on the pipe’s schedule, each with drywall and drying attached.
• A whole-home repipe: roughly $4,000–$15,000 in the Valley depending on size and material, permitted, drywall patched and textured, done in three to five days with water on every night.
• The un-priced difference: repairs happen at emergency speed at the pipe’s convenience. A repipe happens on a calendar at yours.

Add up what the system cost you in the last three years. Then ask what makes the next three different. Nothing? That is the answer.

Reading your own walls

Pre-1970 house with weak flow at the far bathroom and rusty first-draw water: galvanised steel, corroding shut from the inside — replacement territory, not repair. Grey flexible pipe at the water heater connections or in the attic: polybutylene, see paragraph one. Copper with a repair history: count the repairs and check the calendar.

Pressure that is fine near the meter and poor at distance is the pipe narrowing, not the city shorting you.

If you are on the fence

Our repipe decision tool asks six questions and gives you one of three honest answers — including “repair as needed,” which we hand out regularly. And a camera and pressure assessment turns guessing into knowing for a few hundred dollars.

When the answer is repipe, we map every run before cutting, keep the water on overnight, and leave the drywall ready for paint. Financing exists for exactly this job.

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