Flashing repair cost: what the roof line runs
Chimney flashing repair commonly runs $400 to $1,500 with access, the same band as crown repair. What drives the price and when a rebuild is needed.
Chimney flashing repair typically costs $400 to $1,500 with roof access, the same band as a crown repair. A full flashing rebuild with new metal and counter-flashing can exceed it, and a leak that has rotted the roof deck adds carpentry to the bill.
- Typical repair
- $400 - $1,500
- Crown repair, if needed
- $400 - $1,500
- Cap
- $150 - $600
- Inspection first
- $150 - $800
- Partial rebuild
- $5,000 - $15,000
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Chimney flashing repair commonly costs $400 to $1,500 with roof access, which puts it in the same band as a crown repair. The metal itself is cheap. What you are paying for is access, detailing, and the fact that the work has to be woven into both the roofing and the masonry without leaving a path for water.
What flashing does
Flashing is the metal system that seals the joint between the chimney and the roof.
It has two parts. Step flashing runs in pieces along the roof slope, woven into the shingles. Counter-flashing is set into the masonry above it, overlapping the step flashing so water runs down and out rather than behind.
The joint moves. The roof and the chimney expand and contract differently, and the flashing has to accommodate that without opening a gap.
What the price covers
A flashing repair quote includes access, removal of the old metal, new flashing, sealing into the masonry, and reinstating the shingles.
Access is the largest item. A chimney on a low-pitch roof is straightforward; one on a steep pitch, behind a dormer, or above a valley is not.
Detailing is the second. Counter-flashing has to be cut into the masonry joints, which means grinding and pointing, not just bending metal.
Shingle reinstatement is the third. The roofing around the chimney has to be lifted and re-laid without damage, and old shingles crack.
Cost by scope
| Scope | Typical price | What it covers |
|---|---|---|
| Reset and reseal existing flashing | Low end of $400 - $1,500 | Metal sound, seal failed |
| Replace step and counter-flashing | $400 - $1,500 | New metal, masonry cut in |
| Flashing plus crown | $800 - $3,000 | Two water paths fixed |
| Flashing plus roof deck repair | Above the band | Rotted sheathing replaced |
| Partial rebuild | $5,000 - $15,000 | Masonry replaced |
The first row is only appropriate when the metal is genuinely sound. Painting sealant over failed flashing is the most common wasted spend on this part of a chimney.
Worked totals
Flashing repair plus a crown repair: $400 to $1,500 each, so $800 to $3,000.
Add a cap at $150 to $600 and the top-of-chimney work is $950 to $3,600.
If the leak has rotted the roof deck, carpentry is added to the flashing price. The deck repair is priced per square foot of roofing opened, so it varies with how long the leak has been running.
Compare that with the partial rebuild at $5,000 to $15,000 that follows years of water entering behind the brick, and the flashing repair is the cheap intervention.
Why flashing fails
Four mechanisms account for most failures.
The counter-flashing was never cut into the masonry. It was surface-mounted and sealed, and the sealant has since failed.
The metal has corroded. Galvanised steel rusts; copper and lead last far longer.
The joint has moved. Roof settlement or chimney movement opens a gap the flashing cannot span.
The roof was re-covered around the chimney without renewing the flashing. Old metal under new shingles fails at the first hard rain.
Ask which of those applies before accepting a quote for “resealing”.
Repair versus rebuild, and the other water paths
Three conditions call for more than a repair.
The flashing has failed because the masonry above it is spalled and cannot hold counter-flashing. Then the masonry has to be repaired first.
The roof deck around the chimney is soft or stained, which means water has been entering for a long time.
The chimney is leaning or has separated from the house. Movement is a structural issue and needs an engineer, not new metal.
Outside those, a flashing replacement at $400 to $1,500 is the repair.
Age is the fourth consideration. Galvanised flashing on a 30-year-old roof is usually at the end of its life even when it looks intact, and replacing it while the roof is open costs far less than returning to it later.
Flashing and the rest of the water paths.
Flashing is one of four ways water enters a chimney. The others are the crown, the brick face, and the flue opening.
A leak that appears only during wind-driven rain, or that stains the chimney breast below the roof line, points to flashing. A leak that appears in any heavy rain and tracks down the stack points to the crown. A damp patch at the top of the flue points to a missing cap.
Diagnosing which one you have is the difference between a $400 repair and a $1,500 repair that does not stop the leak.
Our chimney leak repair guide covers the water paths in order, and crown rebuild reviews covers the top-of-stack repair.
What flashing work does not include
Flashing is roof-line masonry and metalwork. It does not include the flue, the liner, or the appliance connection.
Any inspection or repair of the flue, and any change to combustion-appliance venting, belongs with a qualified chimney technician. A leak around the flashing is a building-envelope problem; a flue problem is a venting problem, and they are diagnosed separately.
Getting a comparable quote
- Ask whether the counter-flashing will be cut into the masonry or surface-mounted.
- Ask what metal is proposed and how long it is expected to last.
- Ask whether the shingles around the chimney will be replaced or reused.
- Ask what happens if the roof deck is found to be rotten.
- Ask whether the crown and cap will be inspected while the crew is on the roof.
A quote that answers those five is comparable with another. A single figure for “fix the flashing” usually means sealant.
For the wider repair menu, see chimney repair cost. For the failures, flashing repair problems covers what goes wrong and why.
Frequently asked questions
How much does chimney flashing repair cost?
Commonly $400 to $1,500 including roof access, which puts it in the same band as a crown repair. A full rebuild with new metal, counter-flashing, and any roof deck repair costs more.
Why is flashing repair so expensive for a small area?
Access and detailing. The work happens at the roof line, often on a steep pitch, and the metal has to be woven into shingles and sealed in stages. The material is cheap; the labour is not.
Can flashing be repaired with sealant?
Sealant is a temporary measure at best. It fails within a season or two on a roof line that moves with temperature. The durable repair resets the metal into the masonry and the roofing.
How do I know if my flashing is leaking?
Water staining on the chimney breast or ceiling near the chimney, rust on the metal, lifted or tarred-over flashing, and damp masonry below the roof line. A leak that appears only in wind-driven rain points to flashing.
Does flashing repair include the crown?
No. The crown is a separate scope at $400 to $1,500. Both are water paths, and both should be assessed in the same inspection.
Is flashing repair a DIY job?
Not on a roof. It requires working at height, weaving metal into shingles, and sealing into masonry. The risk of a persistent leak or a fall outweighs the saving.
Sources
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