Home warranties cover plumbing failures from normal wear and tear — but not everything plumbing-related qualifies. The line between covered and excluded is where most disputes happen.
Interior plumbing lines:
Drain stoppages: Many plans include clearing of drain stoppages within the foundation. Accessible drain clearing is commonly covered; major blockages requiring camera inspection or excavation may be excluded or sub-capped.
Exterior supply/sewer lines. The pipe from the street to your home — exterior water main, sewer lateral — is NOT covered by standard home warranties. This is HomeServe’s specialty. Average exterior line failure: $4,000-$8,000. Worth adding HomeServe separately.
Permit and code upgrades. When a pipe repair triggers local code requirements (updated materials, added shutoffs), the warranty covers the repair, not the code upgrade.
Polybutylene and galvanized pipe. Many companies exclude repairs when the home has polybutylene (gray plastic, common 1978-1995) or severely deteriorated galvanized steel pipes.
Cosmetic damage. Staining, wall damage from a leak, flooring damage — not covered.
Hose bibs. Outside spigots and hose connections are excluded on most plans.
Sprinkler systems. In-ground irrigation systems are not covered (some add-ons exist for this).
Secondary/consequential damage. Water damage to walls, floors, or belongings from a covered plumbing failure is not covered by the home warranty. That’s homeowners insurance territory.
Most companies cover plumbing with caps in the $500-$3,000 range per claim. Some have annual plumbing limits. AFC Home Club and AHS tend to have broader coverage; Cinch’s combined caps limit plumbing coverage.
Water heaters are typically covered separately from plumbing (see water heater coverage →). The connection lines to the water heater are usually covered under general plumbing.
If you’re buying a home with polybutylene pipe (gray, flexible plastic), check whether your warranty company covers it. Some will repair individual breaks; most won’t fund a whole-house re-pipe.
Drain stoppages within the home are commonly covered, but service fees apply per visit. For recurring clogs that suggest a deeper issue, the underlying cause may be covered if it’s a mechanical failure.