Plumbing decision guides

For equipment, use the age rule first. If the unit is past roughly 80% of its expected life, put the repair money toward replacement. For a tank water heater at 8–12 years' typical life, that means anything past about year 9. For tankless at 15–20 years, the threshold is much later.

For pipe, the question is pattern, not incident. One pinhole leak in copper is a repair. Three pinhole leaks in eighteen months is a system telling you it's done, and continuing to patch is the expensive choice. A whole-home repipe at $4,000–$15,000 looks enormous next to a $350 patch — until you've paid for the patch six times plus two drywall repairs.

For sewer lines, the camera decides. A single root intrusion at one joint is a spot repair. Multiple offsets, a belly holding water, or widespread deterioration across the run means replacement. Insist on seeing the footage, and get a second opinion on anything quoted above five figures.

One thing that should not decide it: a contractor's financing offer. If the only reason a full replacement feels affordable is a monthly payment, price the cash version of both options and compare those. Financing changes affordability, not value.

How to choose

Use the 80%-of-life rule

Past 80% of expected service life, put repair dollars toward replacement instead. It's crude, and it's right far more often than it's wrong.

Count the pattern, not the incident

Repeat failures in the same system within a year or two are the real replacement signal, whatever the individual repair costs.

Get the cash price for both options

Compare repair and replacement as cash numbers before any financing enters the conversation.

Second-opinion anything over five figures

For repipes and sewer replacements, a second camera inspection or second bid is cheap relative to the decision.

Factor in the water damage risk, not just the plumbing cost

A failure that soaks finished space costs far more than the pipe. That risk is what justifies replacing marginal systems early.