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Roof leak repair cost

Updated 2026-10-18 · 8 min read

Repair, leaks & storm damage
Two-colour print tracing a leak path through a roof cutaway
One red line from the failed penetration to the stain.

Water travels; find the entry first

The stain on the ceiling is almost never under the hole. Water enters at a penetration or a lap, runs down the underside of the deck until it meets a rafter, tracks along that rafter until something interrupts it, and drops. Ten feet of horizontal travel is ordinary. That is why a repair quote that names an entry point is worth more than one that names a price.

Trace it from inside with a torch on a wet day: follow the wet line uphill to the highest point of staining on the sheathing, then measure that point from the ridge and from the nearest gable so you can find it from above. A paid diagnostic inspection runs $307 to $571 and is usually credited against the work.

The leak sources, and what each costs

Nationally a leak repair averages about $800, with most between $350 and $1,500. Where yours lands depends almost entirely on which of these it turns out to be.

SourceRepair costTell
Cracked pipe boot$100 – $600Stain directly below a vent stack
Failed step or wall flashing$200 – $600Stain at an interior wall line
Valley failure — see valley types$300 – $1,500Stain where two roof planes meet above
Chimney flashing$200 – $3,500Stain around the chase, worse in driving rain
Missing or damaged shingles$150 – $450Stain below a visibly bare or creased spot
Nail pops$200 – $500Several small stains, no pattern
Skylight$300 – $800Drip at the well, worse in wind-driven rain

Add deck repair at $2–$8 a square foot wherever the sheathing has been wet long enough to soften — which, on a leak that has run for a season, is usual rather than exceptional.

Two-colour print of a water stain on attic ceiling boards, its wet edge marked with a chalk line
A cracked boot collar, the commonest leak on any roof.

How bad is it, really

Tear-off / structural

A deck that gives underfoot, a rafter with visible rot, or a ceiling holding water are not repair-quote situations. Get the roof covered temporarily and get someone competent under it before anyone walks above it.

Two-colour print of a water-stained ceiling
The stain from below, joists suggested behind.

What a tarp buys you

An emergency call typically adds $100 to $300 to the repair, and a tarp buys weeks, not months. It is worth it when the alternative is water in the house, and it is worth nothing at all if it is fastened through sound shingles — every fastener is a new hole. After a storm, tarp and photograph before you clean anything up: the photographs are the claim. The claim guide covers what happens next, and the repair cost guide has the repair-or-replace arithmetic.

Related

Sources

  1. Fixr, Roof Leak Repair Cost (updated 27 January 2026) — read 2026-10-18
  2. Fixr, Roof Repair Cost (updated 21 January 2026) — read 2026-10-18
  3. Fixr, Roof Inspection Cost (updated 31 January 2025) — read 2026-09-04
  4. Fixr, Roof Replacement Cost (updated 4 February 2026) — read 2026-10-18