Chimney Flashing Repair Cost in 2026
A homeowner notices a stain on the ceiling below their chimney after a heavy rain. The roof itself is only 10 years old. The leak is almost certainly at the chimney flashing — and here is every scope element, cost line item, and failure mode that drives the repair.
Why Chimney Flashing Fails
Flashing fails for predictable reasons:
- Caulk-only joints — a counter flashing properly cut into a reglet joint lasts 30–50 years. Caulk-only joints last 3–8 years before UV and thermal cycling break the seal.
- Dissimilar metals — aluminum flashing in contact with copper (even trace contact) causes galvanic corrosion within 10–15 years
- Missing cricket on wide chimney — water pools on the uphill side, eventually finding its way under flashing or through mortar joints
- Mortar deterioration — brick chimneys with failing mortar leak independently of the flashing. Repointing is a separate scope.
- Shingle degradation around flashing — shingles under step flashing wear faster from water concentration
Repair Scope Decision
Before quoting, inspect:
- Step flashing condition — rust, pinholes, lifted edges
- Counter flashing attachment — reglet cut vs. surface mount with sealant
- Mortar joints on the chimney itself — any deterioration
- Crown condition (top of chimney)
- Presence/absence of cricket on uphill side
- Shingle condition in the 2–3 feet around the chimney
If 25% or more of the flashing shows failure, replace all of it. Spot-repairing failing flashing is a 1–2 year warranty exposure.
Material Choices
- Aluminum — $0.80–$1.50 per linear foot. Cheapest, 15–25 year life. Not for coastal environments or in contact with copper.
- Galvanized steel — $1.00–$1.75 per linear foot. 20–30 year life. Mid-range option.
- Copper — $4.50–$8.00 per linear foot. 50+ year life. Premium choice, matches natural patina with slate or copper-trimmed homes.
- Lead-coated copper — $8.00–$14.00 per linear foot. 70+ year life. Historic restoration and highest-end work.
- Stainless steel — $3.00–$6.00 per linear foot. 40+ year life. Specialty for coastal environments.
A standard chimney flashing project uses 20–40 linear feet of flashing material. Material cost ranges $25–$320 depending on choice.
Reglet-Cut Counter Flashing
The gold standard for counter flashing is reglet-cut:
- Cut a 1/2" to 1" deep slot (reglet) into a horizontal mortar joint around the chimney at a height above the step flashing top
- Insert the top edge of the counter flashing into the reglet
- Fill the reglet with high-grade urethane sealant (not silicone — silicone fails on masonry)
- Secure with lead wedges or masonry fasteners every 12 inches
Reglet-cut counter flashing lasts 30–50 years with no maintenance. Surface-mount counter flashing (attached with masonry screws + caulk) lasts 10–20 years. The labor difference is 1–2 hours per chimney. Quote the reglet method — the customer gets 2–3x the service life.
Cricket Install (If Needed)
A cricket is a mini-roof structure on the uphill side of the chimney. Build scope:
- Rip 2x4 or 2x6 lumber to form the cricket frame — $20–$40 materials
- Sheath with 1/2" OSB or plywood — $25–$50 materials
- Ice & water shield over the cricket — $30–$60 materials
- Flashing to tie into chimney and shingle courses
- Shingles over cricket
- Labor: 2–4 hours
Cricket install adds $400–$900 to a flashing repair. Required by code on chimneys over 30" wide (IRC R1003.20 — verify local amendments).
Labor Scope
- Setup, ladder, roof access: 30–60 min
- Remove old flashing and 3–4 shingle courses around chimney: 1–2 hours
- Cut reglet (if replacing counter flashing): 1 hour
- Install step flashing woven with new shingle courses: 2–3 hours
- Install counter flashing in reglet, seal: 1 hour
- Replace surrounding shingles, test, clean up: 1–2 hours
Total: 6–10 hours for a solo roofer, 4–6 hours with a 2-person crew. At $75–$100/hr: $450–$1,000 labor.
Access Multipliers
Steep roof (>8/12 pitch): add 1.5–2x labor time for safety and equipment. Tie-off anchors, roof jacks, scaffolding.
Two-story chimney: add 30–60 minutes for ladder/scaffold setup. 3+ story requires scaffolding or lift ($200–$500 rental/day).
Build the Quote
Use the Chimney Flashing Repair Cost Calculator to price by chimney size, flashing material, counter flashing method, cricket requirement, and roof pitch. The calculator produces a complete quote that reflects the actual scope — including the cricket most lowball quotes leave out.
Frequently Asked Questions
How much does chimney flashing repair cost?
A standard chimney flashing repair (step flashing, counter flashing, and cricket if needed) runs $450–$1,200 in 2026. The variables are chimney size, roof pitch and access, material (aluminum, copper, or lead), and whether the counter flashing is reglet-cut or surface-mount. Full flashing replacement with copper and a cricket on a steep roof pushes $1,500–$2,500.
When should chimney flashing be replaced instead of repaired?
If the step flashing is 20+ years old and showing rust, pinholes, or lifted edges, replacement is the right call — spot repairs on failing flashing leak within 1–2 years. Replacement is also required when the roof itself is being replaced. If less than 25% of the flashing is damaged and the rest is intact, targeted repair is defensible.
What is a cricket on a chimney?
A cricket (also called a saddle) is a small ridge of framing and flashing on the uphill side of a chimney that diverts water around the chimney instead of damming against it. Code requires crickets on chimneys wider than 30" (varies by jurisdiction). Without a cricket, the uphill side of a wide chimney traps water, debris, and ice — causing roof deck rot within 10–15 years.
What is the difference between step flashing and counter flashing?
Step flashing is the L-shaped pieces of metal that interleave with each shingle course along the sides of the chimney. Counter flashing is the strip of metal attached to the chimney itself that covers the top edge of the step flashing — forming a two-piece watertight joint. Both are required for a proper chimney-to-roof seal. Caulking a single piece of flashing to the chimney (common amateur fix) fails within 2–5 years.