Chimney flashing repair costs $300 to $1,800 on average by HomeGuide's 2026 figures1, while Angi reports a 2026 national average of $1,000 with most homeowners spending $400 to $1,6002. Fixr prices flashing repair alone at $200 to $300 and full replacement at $300 to $8003. The publishers scope their figures differently, so every range below is labeled with its source's own scope.
Safety first. Chimney flashing work means working at roof height. In 2020, ladders were involved in 161 workplace deaths and 22,710 workplace injuries in the U.S., and the CDC notes that many ladder injuries happen at home and that using a ladder puts you at risk for a ladder-related fall injury4. Hire a roofer or chimney professional qualified for flashing repair rather than climbing up yourself.
This guide covers the flashing where the chimney meets the roof. For other chimney work, see our chimney repair cost guide.
Repair vs replacement
All three publishers separate minor resealing from full replacement, and each describes the same dividing line: small cracks or lifted edges can be resealed, while rusted, corroded, or missing metal calls for replacement123. Their per-job figures:
| Scope | HomeGuide, per job (2026) | Angi, per job (2026) | Fixr, per job (2025) |
|---|---|---|---|
| Minor reseal or patch | $200 – $500 | from $200 | $200 – $300 |
| Full replacement | can reach $1,800 or more on large chimneys | $400 – $1,600 or more | $300 – $800 |
The replacement ranges are not scoped the same way – HomeGuide's figure describes large chimneys specifically, and Angi ties its range to extensive damage – so they are reported as published rather than compared directly.
Cost by chimney size
HomeGuide breaks its estimates down by chimney size, without defining the size brackets1:
| Chimney size | HomeGuide average, per repair (2026) |
|---|---|
| Small chimney | $300 – $1,200 |
| Mid-sized chimney | $400 – $1,500 |
| Large chimney | $500 – $1,800 |
Cost by flashing material
Both HomeGuide and Angi price the three common flashing metals – steel, aluminum, and copper – per linear foot, but neither says whether its figures cover raw flashing stock, fabricated pieces, or installed flashing, and neither states a thickness or width. Their figures also differ widely, and without those scopes established, material pricing cannot be compared reliably between these sources – so the numbers are omitted here12.
Within each publisher's own pricing, copper sits at the high end: both pages state that copper costs the most of the three metals12.
Labor
HomeGuide reports that professional masons or chimney sweeps charge $50 to $125 per hour on average, and that labor typically accounts for 60 to 70 percent of the total bill1. Angi puts the average at $75 per hour2. Both note that some contractors quote a flat rate instead of hourly billing for smaller jobs.
Related costs
HomeGuide lists several costs that can accompany flashing work1:
| Item | HomeGuide average, per job (2026) |
|---|---|
| Chimney inspection | $100 – $250 |
| Roof inspection | $100 – $400 |
| Chimney sealing | $150 – $400 |
| Sealing with waterproofing | up to $850 |
| Other chimney repairs | $200 – $7,000 |
We cover related work in separate guides: roof inspection cost, chimney cap installation cost, and chimney sweep cost.
When to call a pro
HomeGuide lists water stains on ceilings or walls near the chimney, damp spots in the attic around the chimney base, rust on the metal, and gaps between the flashing and the chimney or roof as signs the flashing needs attention1. It recommends choosing a contractor licensed and insured for both roofing and chimney work, and notes that both roofers and certified chimney sweeps replace flashing.