Most homeowners pay $400–$1,600 to repair or replace chimney flashing, with a national average of about $1,000. Resealing minor gaps can cost as little as $200–$500, while large or stone chimneys can top $1,800–$2,000 (Angi and HomeGuide data, as of October 2026).
Updated October 8, 2026. Source: Angi + 2 more. National US estimates.
Chimney flashing is the metal that seals the joint between the chimney and the roof: step flashing woven into the shingles, counter-flashing set into the mortar joints above it, and on wider chimneys a cricket (saddle) on the uphill side. When sealant dries out or the metal corrodes or pulls away, water runs down the chimney into the attic and ceiling.
This guide covers what pros charge to reseal versus replace chimney flashing, how material and chimney size change the price, and how to get comparable quotes. For crown, mortar and liner prices, see our chimney repair cost guide.
Average cost
Typical chimney flashing costs, national averages as of October 2026:
| Scenario | Typical range | Notes |
|---|---|---|
| Reseal or patch minor gaps | $200–$500 | Fresh sealant, refastened counter-flashing |
| Replace flashing on a small to mid-size chimney | $400–$1,600 | Most common range; average about $1,000 |
| Large or stone chimney, or copper flashing | $1,500–$2,000+ | More metal, more labor; a cricket adds cost |
Chimney flashing cost by chimney size
| Chimney size | Typical cost |
|---|---|
| Small | $300–$1,200 |
| Mid-sized | $400–$1,500 |
| Large | $500–$1,800 |
| Large or stone (complex) | $2,000+ |
Chimney flashing material cost per linear foot
Material is a small share of the bill; labor makes up roughly 60%–70% of the cost:
| Material | Cost per linear foot | Notes |
|---|---|---|
| Aluminum | $5–$10 | Common, affordable, easy to bend |
| Galvanized steel | $6–$10 | Sturdy; can rust over time |
| Copper | $15–$30 | Premium, very long-lasting |
Cost breakdown: materials, labor, permits and extras
Line-item estimate for replacing the step flashing and counter-flashing on a mid-size brick chimney on an asphalt shingle roof. Ranges are national, as of October 8, 2026.
| Cost item | Typical range | What it covers |
|---|---|---|
| Materials | $50–$250 | Aluminum or galvanized step and counter-flashing, sealant, a few shingles |
| Labor | $300–$1,100 | Usually 60%–70% of the bill; masons and sweeps charge about $50–$125 per hour |
| Permits | $0–$0 | Not usually required for flashing work |
| Contingency | $50–$250 | Mortar joints that need repointing to seat the counter-flashing, or wet sheathing |
| Estimated total | $400–$1,600 | Before any discounts or rebates |
Step flashing alone typically runs $400–$600, while continuous flashing around the whole chimney costs about $800–$1,000, per Angi.
What affects the price
- Flashing material. Aluminum ($5–$10 per linear foot) and galvanized steel ($6–$10) are the budget choices; copper costs $15–$30 per linear foot but lasts much longer and is often used to match historic homes.
- Length. A bigger chimney has a longer perimeter to flash. HomeGuide puts small chimneys at $300–$1,200 and large ones at $500–$1,800; Angi says large or stone chimneys can exceed $2,000.
- Roof type and pitch. Steep roofs take longer to work on safely, and tile, slate or metal roofing is slower to remove and reinstall around the chimney than asphalt shingles, which raises labor.
- Chimney height. Chimneys on two- or three-story homes, or tall stacks, need more ladder or staging work, which adds labor hours; sources describe this as a cost factor without a fixed surcharge.
- Sealants and counter-flashing. A simple reseal costs $200–$500, but if the counter-flashing has pulled out of the mortar, the joints may need regrinding and repointing. Building codes require a cricket behind chimneys wider than 30 inches, which adds to the job when one is missing.
Ways to save
- Act at the first water stain near the chimney. Resealing for $200–$500 is far cheaper than replacing flashing plus rotted sheathing and drywall.
- Replace chimney flashing when you replace the roof; the shingles are already off, and many roofers include new flashing in the roof price.
- Ask the sweep to check flashing and sealant at your annual inspection, so problems are caught when they're still minor.
- Choose aluminum or galvanized steel unless you're matching existing copper; the material difference can be several dollars per linear foot.
- Get at least three written quotes stating whether the price covers step flashing, counter-flashing, a cricket and any repointing.
How to get an accurate quote
Ask at least three licensed, insured roofers or chimney pros for written quotes. Tell them:
- Where water shows up (attic, ceiling, fireplace wall) and whether it appears in every rain or only wind-driven storms.
- The chimney's width and material (brick, stone, stucco) and your roof material and pitch.
- How many stories the house has and the chimney's approximate height above the roof.
- Ask whether they will replace both step and counter-flashing, install a cricket if needed, repoint the joints and warranty the work.
FAQ
Can chimney flashing be repaired, or does it need to be replaced?
Minor gaps and dried-out sealant can be resealed for about $200–$500. If the metal is rusted, bent or pulling away from the mortar, replacement is the lasting fix, typically $400–$1,600.
Who should I hire to fix chimney flashing: a roofer or a chimney sweep?
Either can do it. Roofers are best when shingles have to be removed and replaced; chimney pros and masons are better when the counter-flashing is set into mortar joints that need repointing.
How do I know if my chimney flashing is leaking?
Common signs include water stains on the ceiling or walls near the chimney, damp attic wood around the chimney, and rusted, lifted or caulk-covered metal at the base. A roof or chimney inspection can confirm the source.
For the big picture, start with our complete roof replacement cost guide.
Related cost guides
Sources
- Angi — How Much Does Chimney Flashing Repair or Replacement Cost? [2026 Data] (updated Sep 23, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does Chimney Flashing Repair Cost? (2026) (Feb 10, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does Roof Flashing Repair Cost? (2026) (Jan 13, 2026). Checked October 8, 2026.
Prices are estimates and vary by location and provider. See our methodology and editorial policy. Browse all exterior cost guides.