ROOFING COST ESTIMATOR
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Chimney Flashing Repair Cost Calculator
The Chimney Flashing Repair Cost Calculator estimates what it costs to reseal or replace the flashing where your chimney meets the roof. Choose your roof material, chimney type and size, the repair you need and the flashing metal, and you get a planning budget split into materials, labor, disposal and service call, with budget, standard and premium ranges. It is free and takes under a minute. Use the result to plan the repair and compare roofer quotes. It is a planning estimate, not a bid.
- Free Planning Estimate
- Detailed Cost Breakdown
- Budget / Standard / Premium
Chimney Flashing Repair Calculator
Estimate your chimney flashing repair cost
Answer three short sets of questions: your roof, your chimney and the repair. Only your ZIP code, roof material and chimney type are required. Everything else starts on the most common choice, which is a full re-flash of one standard chimney in aluminum. Adjust the details to see how each one changes the budget.
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The Chimney Flashing Repair Cost Calculator provides planning estimates only. Results are not quotes, bids or guaranteed prices. Estimates are based on general US planning assumptions and do not reflect live contractor pricing or pricing specific to your ZIP code. Actual contractor pricing may vary based on location, conditions, material choice, labor market and project complexity. Chimney flashing repairs can reveal rotted decking, framing or masonry damage that adds to the cost. Always get written quotes from licensed, insured professionals before starting work.
Your Result
How to read your estimate
The large figure at the top is the estimated repair budget for a standard repair, shown as a range. Below it you will find three things:
Cost breakdown
Where the standard budget goes: materials, labor, disposal, service call and safety, and any ice and water shield or hidden damage allowance you selected.
By work item
How materials and labor split between the chimney flashing, cricket work and mortar repointing.
Budget, Standard and Premium
Three repair levels that reflect different materials, roofer experience and workmanship. If you are repairing more than one chimney, each level also shows an approximate cost per chimney.
Every figure is a planning range. Actual contractor pricing may vary based on location, conditions, material choice, labor market and project complexity.
Cost breakdown
What each cost category covers
| Cost category | What it covers | When it applies |
|---|---|---|
| Materials | Flashing metal, sealant and fasteners, plus cricket materials or mortar if selected. For a reseal, sealants and patch materials only. | Always |
| Labor | Removing the old flashing, fitting the new flashing and re-laying the roofing around the chimney, plus any cricket work or repointing. | Always |
| Disposal | Hauling away the old flashing and debris. | Full re-flash and counter flashing only |
| Service call & safety | Trip, setup and minimum job charge, plus extra safety gear on steep or tall roofs. | Always |
| Ice & water shield | An extra leak barrier under the new flashing. | When the option is ticked (full re-flash) |
| Hidden damage allowance | A contingency for rotted decking or framing found beside the chimney. | When the option is ticked |
Cost guide
How much does chimney flashing repair cost?
A full re-flash of one standard brick chimney on an asphalt shingle roof typically budgets at about $950 to $1,150. A budget repair starts near $550 and a premium one can reach about $1,950. These planning figures assume a one-story home, a medium roof pitch and aluminum flashing.
The repair method changes the budget most. The table shows the calculator's ranges for the same brick chimney.
| Repair method | Budget | Standard | Premium |
|---|---|---|---|
| Reseal the existing flashing | $280 – $330 | $470 – $575 | $775 – $950 |
| Replace counter flashing only | $370 – $440 | $625 – $750 | $1,050 – $1,300 |
| Full re-flash | $550 – $650 | $950 – $1,150 | $1,600 – $1,950 |
Planning estimates from the OmniEstimate calculator. They are not quotes. Actual contractor pricing may vary.
What is the average cost to repair chimney flashing?
A full re-flash of one standard brick chimney typically budgets at about $950 to $1,150 on an asphalt shingle roof, based on OmniEstimate's standard planning assumptions. Resealing the existing flashing budgets at about $470 to $575. Larger chimneys, copper flashing, crickets and tile or slate roofs cost more.
How this calculator works
The calculator starts from a full re-flash of one standard brick chimney, with materials and labor priced separately. It adjusts both for your chimney type and size, and adjusts labor for your roof material, pitch and number of stories. Flashing materials are adjusted for the metal you choose. A lighter repair uses a share of the full re-flash cost. Cricket work, mortar repointing, ice and water shield and a hidden damage allowance are added when you select them.
The three repair levels are built from different inputs for materials, roofer experience and workmanship. They are not one number multiplied up and down. Your ZIP code identifies your market for contractor matching and does not change the price.
Worked example: one standard brick chimney, full re-flash, aluminum, asphalt shingle roof
Budget
$550 – $650
Standard
$950 – $1,150
Premium
$1,600 – $1,950
What affects the cost
What affects the cost of chimney flashing repair?
Repair method. Resealing means cleaning the joints and applying new sealant to flashing that is still sound. It is the cheapest option and usually a short-term one. Replacing the counter flashing only renews the top layer that is set into the chimney while leaving the step flashing in place. A full re-flash replaces the step flashing, the apron at the front and the counter flashing, and is the lasting fix.
Chimney type. What the flashing seals against changes the labor. On a brick chimney, the counter flashing is set into cut mortar joints. Stone has uneven joints that take longer to cut, and a stucco chimney has to be cut back and patched. A wood-framed chase with siding is simpler, because the flashing tucks behind the siding. A metal chimney pipe uses a roof flashing and storm collar instead of step and counter flashing.
| Chimney type (full re-flash) | Budget | Standard | Premium |
|---|---|---|---|
| Metal chimney pipe | $340 – $400 | $575 – $700 | $975 – $1,150 |
| Wood-framed chase | $480 – $575 | $825 – $1,000 | $1,400 – $1,700 |
| Brick | $550 – $650 | $950 – $1,150 | $1,600 – $1,950 |
| Stucco-covered | $625 – $750 | $1,100 – $1,300 | $1,850 – $2,250 |
| Stone | $650 – $775 | $1,100 – $1,350 | $1,900 – $2,300 |
What is chimney flashing?
Chimney flashing is the layered sheet metal that seals the joint where a chimney passes through the roof. It usually has four parts: an apron at the front, step flashing along the sides, a back pan or cricket behind the chimney, and counter flashing set into the chimney that covers the other pieces.
Chimney size. A bigger chimney has more flashing around its base. For a brick chimney, the standard range rises from $950 to $1,150 for a standard size to about $1,300 to $1,550 for a large chimney wider than 30 inches, and about $1,600 to $1,950 for a very large or multi-flue stack.
Flashing metal. Galvanized steel and aluminum are the common, lower-cost choices. Stainless steel and copper last longer and cost more. Because flashing metal is a small share of a labor-heavy job, the difference is smaller than the metal prices suggest.
| Flashing metal (standard brick chimney, full re-flash) | Standard range |
|---|---|
| Galvanized steel | $925 – $1,100 |
| Aluminum | $950 – $1,150 |
| Stainless steel | $1,100 – $1,300 |
| Copper | $1,250 – $1,500 |
Chimney cricket. A cricket is a small peaked structure behind the chimney that steers water around it. Re-flashing an existing cricket moves the standard repair to about $1,200 to $1,450. Building a new one moves it to about $1,650 to $1,950. On a large chimney, a full re-flash with a new cricket budgets at about $2,300 to $2,750.
How much does a chimney cricket cost?
In OmniEstimate's calculator, building a new cricket behind a standard chimney adds roughly $700 to $800 to a standard flashing repair. Re-flashing an existing cricket adds roughly $250 to $300. Larger chimneys need larger crickets and cost more.
Roof material, pitch and height. The roofing around the chimney is lifted and re-laid, so the roof type affects labor. For the same brick chimney, the standard range is about $1,050 to $1,300 on a metal roof, $1,200 to $1,450 on clay or concrete tile, and $1,550 to $1,850 on natural slate. A steep, two-story roof budgets at about $1,250 to $1,500, which includes extra safety gear.
Number of chimneys. Repairing two chimneys in one visit shares the trip and setup. Two standard brick chimneys budget at about $1,600 to $1,900, or roughly $800 to $950 each.
Material costs. Materials are a small part of this job. For a standard brick chimney re-flash in aluminum, the calculator budgets about $140 to $180 for flashing metal, sealant and fasteners. A reseal uses about $35 to $45 in sealants and patch materials.
Labor costs. Labor is most of the cost. A standard full re-flash budgets about $500 to $625 in labor, because the roofer has to remove the old flashing, cut the mortar joints, fit the new metal in layers and re-lay the roofing. A reseal budgets about $200 to $250 in labor.
Service call, disposal and other costs. Service call. Small repairs have a minimum cost for the trip and setup. The standard allowance is about $230 to $280, and it applies even to a reseal. Disposal. About $55 to $65 at standard pricing for hauling away old flashing. It is not charged for a reseal. Ice and water shield. Optional on a full re-flash. It adds about $90 to $110 at standard pricing. Mortar repointing. Optional on brick and stone chimneys. Repairing the joints at the flashing line adds about $270 to $340. Hidden damage allowance. Optional. It adds a contingency of about 12 percent of materials and labor at standard pricing.
Reseal or replace?
Reseal when the metal is intact and firmly attached and only the sealant has cracked or pulled away. Replace the counter flashing when the top layer is loose, rusted or was only surface-mounted with sealant, and the step flashing underneath is still sound. Fully re-flash when the flashing is rusted through, bent, missing, buried in old tar, or was never installed in proper layers. If your roof is close to the end of its life, it is usually cheaper to re-flash the chimney as part of the roof replacement.
Can you just reseal chimney flashing?
Yes, if the metal is intact and firmly attached. Resealing is the cheapest repair, at about $470 to $575 in OmniEstimate's standard estimate, but sealant dries and cracks, so it is usually a short-term fix. Rusted, loose or missing flashing should be replaced.
Is it the flashing, or something else?
Not every leak near a chimney is a flashing leak. Water can also get in through a cracked chimney crown, a missing or damaged cap, worn mortar joints or porous brick. Ask the roofer to confirm the source before you pay for a flashing repair. A roof inspection can help when the cause is not obvious.
Regional pricing differences
Labor rates and the demand for roofers differ from one market to another and from season to season. The calculator does not adjust for location. Treat the result as a national planning range, then get quotes from local roofers to see where your market sits.
How to avoid unexpected costs
Ask whether the quote is for resealing, counter flashing only or a full re-flash. Quotes for different scopes are not comparable. Ask whether the counter flashing will be cut into the mortar joints or surface-mounted with sealant. Ask how rotted decking will be priced if it is found. If the mortar is crumbling, budget for repointing so the new flashing has something solid to seal against.
Questions to ask a roofer
Which parts of the flashing will you replace, and which will you leave? What metal will you use, and how will the counter flashing be attached? Does my chimney need a cricket? What does your workmanship warranty cover, and for how long? Will the repair affect my existing roof warranty?
When to hire a professional
Chimney flashing is layered work done at height, often on the steepest part of the roof. It involves cutting masonry, bending metal and re-laying roofing so that every layer sheds water onto the next. Mistakes cause leaks that may not show for months. For those reasons most homeowners hire a roofer for anything beyond a small sealant touch-up.
FAQs
Chimney flashing repair FAQs
How much does chimney flashing repair cost?
A full re-flash of one standard brick chimney on an asphalt shingle roof typically budgets at about $950 to $1,150, based on this calculator's standard assumptions. Resealing the existing flashing budgets at about $470 to $575, and replacing only the counter flashing at about $625 to $750. Larger chimneys, copper, crickets and harder roofs cost more.
Is it better to reseal or replace chimney flashing?
Resealing costs less and can buy time when the flashing metal is still sound and only the sealant has failed. Sealant dries and cracks, so it often fails again within a few years. Flashing that is rusted, loose, missing or covered in old tar should usually be replaced.
What is the difference between step flashing and counter flashing?
Step flashing is the series of L-shaped metal pieces woven in with the roofing along the sides of the chimney. Counter flashing is the top layer that is set into the chimney's mortar joints and folds down over the step flashing. The two layers work together so water cannot get behind either one.
What is a chimney cricket, and do I need one?
A chimney cricket is a small peaked structure built on the roof behind a chimney. It steers water and debris around the chimney so they do not collect behind it. Building codes commonly call for a cricket behind a chimney wider than 30 inches. In this calculator, building a new cricket adds roughly $700 to $800 to a standard repair.
How do I know if my chimney flashing is leaking?
Common signs are water stains on the ceiling or walls near the chimney, damp or stained brick in the attic, rusted or loose flashing, gaps where the flashing meets the chimney, and cracked sealant or tar. Leaks that show up mainly in wind-driven rain often point to flashing.
Is copper chimney flashing worth the extra cost?
Copper is the longest-lasting flashing metal and is often chosen for slate, tile and historic homes. It costs more: this calculator budgets a standard brick chimney re-flash at about $1,250 to $1,500 in copper, compared with about $950 to $1,150 in aluminum. On an asphalt roof with a shorter life, aluminum or galvanized steel is usually enough.
Can chimney flashing be replaced without replacing the roof?
Yes. A roofer lifts the roofing around the chimney, fits the new flashing and re-lays the roofing. If the roof is close to the end of its life, it usually costs less to re-flash the chimney as part of the roof replacement, because the roofing is already off.
Does my ZIP code change the estimate?
No. The calculator uses your ZIP code to identify your market and match you with local professionals. It does not adjust the price. Local labor rates do vary, so use the result as a planning range and compare it with quotes from contractors in your area.
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