Chimney Leak Repair Cost
Chimney flashing repair costs $150–$700 in 2026. The expensive version of this leak is a damaged chimney crown — rebuilding one runs $1,000–$3,500. Telling the two apart is most of the battle.
Where chimney leaks actually start
A chimney is a big masonry box punched through the roof, and it sheds water in every direction. The seal where it meets the roof is a two-part flashing system: step flashing woven into the shingles along the sides, and counter-flashing set into the mortar joints above it. Leaks start when the counter-flashing pulls out of a crumbling mortar joint, when step flashing corrodes, or when the concrete crown on top of the chimney cracks and lets water into the masonry itself — which then weeps through and looks like a roof leak. Stains beside the chimney, inside the firebox, or on the wall below it are the usual tells.
Cost by problem
| Problem | Typical cost | Who fixes it |
|---|---|---|
| Step / counter-flashing repair | $150 – $700 | Roofer |
| Mortar joint repair around flashing | $150 – $700 | Roofer or mason |
| Chimney crown rebuild | $1,000 – $3,500 | Mason |
What drives the price
- Chimney size and position. A wide chimney, or one sitting low on the roof where it catches the runoff of the whole slope above it, needs more flashing work — and a cricket (a small peaked diverter) on the uphill side if one was never fitted.
- How the old flashing was done. Surface-mounted counter-flashing held on with sealant fails fast and is cheap to redo badly and moderately priced to redo properly, with the flashing cut into the mortar joints as it should be.
- Masonry condition. If the mortar is crumbling, new flashing has nothing solid to anchor into — repointing comes first, and the job edges toward mason territory and mason pricing.
DIY vs. pro
Sealant is the classic DIY chimney "fix," and it's the main reason chimney leaks come back: a bead of caulk over a failed flashing joint lasts a season at best, and it can hide rot while it does. Properly reglet-cut counter-flashing set into the mortar is a pro job with the right tools. If the crown is cracked, that's masonry work — forming and pouring a new crown with the correct overhang and slope isn't a weekend project for most homeowners. The honest DIY move is diagnosis from the attic and the ground with binoculars, then the right trade on the phone.
When is it an emergency?
Chimney leaks are usually slow and can wait for a scheduled repair. Water pouring in during a storm, or a stain spreading fast, justifies an emergency call — which adds a 25–50% surcharge and usually buys a temporary seal first. See emergency roof repair costs.
Frequently asked questions
How much does chimney flashing repair cost?
$150–$700 in 2026 (HomeGuide) — step flashing, counter-flashing, or mortar repair where the chimney meets the roof. A crown rebuild is $1,000–$3,500.
Why does my chimney leak when it rains?
Almost always failed step flashing, counter-flashing pulled out of a worn mortar joint, or a cracked crown letting water into the masonry — not the roof field itself.
Do I call a roofer or a mason for a chimney leak?
Roofer for flashing ($150–$700); mason for the crown and brickwork ($1,000–$3,500). A good roofer will tell you when it's masonry.
Get an exact price for your leak
Ranges only get you so far. Tell us what you're seeing and get a real quote — Jacksonville-area requests go straight to Homeland Construction & Roofing.
Related guides
- Roof Leak Repair Cost — every leak source priced
- Pipe Boot Leak Repair Cost
- Roof Valley Leak Repair Cost
- Roof Repair Cost — minor to major repair bands
Sources: HomeGuide, "Roof Leak Repair Cost" (2026 by-source pricing — chimney flashing $150–$700; chimney crown $1,000–$3,500); Angi emergency surcharge data (25–50%). Figures reviewed by Homeland Construction & Roofing Of America LLC. Last updated November 2026.