Chimney Flue Repair Cost Calculator
The national estimate is adjusted by your state's overall price level (BEA Regional Price Parities, 2022, U.S.=100). This is a cost-of-living proxy applied to the national chimney flue repair price — not a per-state chimney flue repair quote. Always get local quotes before buying.
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Gas appliances producing 300–400°F exhaust use aluminum liners at $15–$25/lft; wood-burning appliances producing 1,000–2,000°F creosote exhaust require 316Ti stainless at $30–$55/lft; oil appliances producing sulfuric acid condensate need AL29-4C at $45–$70/lft. Installing aluminum on a wood-burning fireplace saves $500–$1,000 upfront but corrodes through in 3–5 years, costing $2,500–$4,500 to remove and replace. A 30-foot chimney in the correct material runs $900–$2,100 for gas, $900–$1,650 for wood, or $1,350–$2,100 for oil in materials alone.
An oversized liner matching the old 8×8 or 8×12 clay tile diameter instead of a modern furnace's required 4–5 inches cools flue gases too rapidly, causing condensation that deposits corrosive moisture on liner walls. A properly sized 6-inch stainless steel liner for a wood stove costs $30–$55/lft versus $45–$80/lft for an oversized 8-inch liner — correct sizing saves $450–$750 in material on a 30-foot run. The appliance manufacturer's installation manual specifies the required diameter in inches; a 4–6 inch collar on a modern gas insert versus an 8-inch legacy opening is a code-critical mismatch that costs $1,500–$3,000 to redo.
A chimney camera inspection costs $150–$350 and reveals crack locations, joint separation, collapsed tiles, and obstructions throughout the full flue height — without it, choosing the wrong repair method wastes thousands. A flue with 2–3 cracked tiles but intact joints can use a HeatShield poured liner at $2,000–$4,000; widespread joint separation requires full stainless relining at $2,500–$5,500. Attempting the cheaper poured liner in a flue with displaced tiles creates carbon monoxide voids and wastes the $2,000–$4,000 already spent.
Hidden costs
Flue repair quotes rarely include the mechanical or fuel-appliance permit, which runs $75–$250 depending on jurisdiction, and a fuel-conversion reline (wood-to-gas, or adding a stove) almost always triggers one. A UL 1777 liner serving a solid-fuel appliance gets a rough and final inspection in most 2021 IRC jurisdictions, and a failed final forces a re-inspection fee of $50–$100 plus a return trip at $90–$140/hr (BLS OEWS 47-4011 median $22.15/hr). Some counties also require a Level 2 NFPA 211 camera inspection at $150–$300 before issuing the permit — separate from the diagnostic the contractor runs to quote the job.
Tear-out reline pricing often excludes haul-off of broken clay tile and built-up creosote, which crews bill at $150–$400 per job; a stainless reline of a collapsed flue generates 200–400 lbs of tile rubble that cannot go in standard household trash. Stage 3 glazed creosote is treated as a flammable hazard requiring sealed-bag disposal, and markets with transfer-station minimums add a $40–$80 dump fee per load. A pre-reline cleaning to bare tile adds $200–$350 before any liner drops, since stainless cannot be installed over heavy glaze.
A top-down stainless install on a roof over 6:12 pitch needs roof jacks, planks, and a tie-off anchor that add $300–$600 in setup, and a chimney rising more than 4 ft above the ridge needs scaffold staging at $400–$900 for a multi-day reline. Crews on slate or clay-tile roofs charge a fragile-surface premium of $150–$300 because foot traffic cracks tiles. A ground-level mobilization minimum of $400–$600 applies on short flues where the per-foot band would otherwise underprice the trip, and power-line clearance near the chimney can force a hand-rigged install that adds crew-hours at $90–$140/hr.
Flue repair frequently surfaces shell damage the flue quote does not cover: a cracked crown gets re-poured for $200–$500, a rusted chase cover or new top plate runs $150–$400, and spalled brick at the chimney top often needs $500–$1,200 per section before a liner termination can seal. Flashing at the roof line adds $300–$700 to reflash, and a new stainless cap or rain pan to terminate the liner runs $100–$300 installed. These adjacent lines routinely add 20–40% on top of the per-foot flue band when the chimney has gone years without service, and skipping them voids the liner warranty in most cases.
Rookie mistakes
Brush-on flue sealants ($200–$600 for a full flue) work only on hairline cracks under 1/16 inch in properly aligned tiles; tiles shifted more than 1/4 inch allow flue gases to escape into the chimney chase, creating a carbon monoxide intrusion risk. Building codes require a continuous gas-tight flue liner per NFPA 211 section 14.3, and sealant over structurally failed tiles fails the chimney inspection — triggering a $50–$100 re-inspection fee plus mandatory relining. If tiles are displaced more than 1/4 inch, the only code-compliant repair is a full relining at $2,500–$5,500.
The concealed flue section through the attic typically runs 8–15 feet and accumulates 2–3× more condensation than the above-roof section because attic temperatures average 20–30°F cooler, accelerating tile spalling. Relining only the top 5–8 feet of a 25-foot flue costs $500–$1,200 but leaves 17–20 feet unprotected; when the lower section fails in 3–5 years, removing the partial liner and completing the job totals $3,500–$6,500 — $1,000–$2,000 more than a full liner initially. A full-length stainless liner covering all 20–30 feet from the appliance connection to the chimney cap carries a 20–25 year manufacturer warranty; a partial repair carries none.
A missing cap deposits roughly 1/3 gallon of water per storm event directly onto clay tile liner from 1 inch of rain on an 8×8-inch flue opening, accelerating damage at 5–10× the rate of a capped flue. After 3–5 years of uncapped exposure, full relining costs $2,500–$5,500. A stainless chimney cap with spark screen costs $150–$400 installed — if the mason's scaffold is already up for flue repair, adding the cap protects a $3,000–$5,000 liner investment at zero extra access cost.
Example project costs
Short Chimney (15 lft)
15 linear ft, single-story gas flue
| Joint tuckpointing (mortar only) | $1,500-$2,250 |
| Cast-in-place resurfacing alternative | $2,250-$3,000 |
| Stainless steel liner replacement | $3,000-$4,500 |
| Mobilization minimum (short flue) | $400-$600 |
| Total | $1,500-$4,500 |
Standard (20 lft)
20 linear ft, standard masonry flue
| Joint tuckpointing (mortar only) | $2,000-$3,000 |
| Cast-in-place resurfacing alternative | $3,000-$4,000 |
| Stainless steel liner replacement | $4,000-$6,000 |
| Tile tear-out + creosote disposal | $350-$750 |
| Total | $2,000-$6,000 |
Two-Story (30 lft)
30 linear ft, two-story wood-stove flue
| Joint tuckpointing (mortar only) | $3,000-$4,500 |
| Cast-in-place resurfacing alternative | $4,500-$6,000 |
| Stainless 0.020-in liner + insulation | $6,000-$9,000 |
| Scaffold staging + fall protection | $700-$1,400 |
| Total | $3,000-$9,000 |
What NOT to build with chimney flue repair
Don't use chimney flue repair for: Chimneys with confirmed creosote buildup exceeding Stage 3 (glazed creosote)
Stage 3 glazed creosote burns at 1,000°F+ during a chimney fire; a new liner installed over it creates an insulated fuel layer between liner and flue wall. Professional cleaning to Stage 1 costs $200–$500 and is a non-negotiable prerequisite before any liner installation.
Don't use chimney flue repair for: Unlined chimneys built before 1940 that serve as the sole structure supporting the roof
Pre-1940 chimneys often carry roof loads as structural masonry piers; drilling or inserting liners risks compromising that structure, and a structural engineer evaluation runs $300–$600 before any flue modification can proceed.
Flue Repair and Relining Methods Compared
| Option | Pros & Cons | Best For |
|---|---|---|
| Stainless Steel Flexible Liner | Most common method; $2,500–$5,500 installed; fits any flue shape; 20-year+ warranty; all-fuel rated (316Ti); requires top and bottom connectors | Any chimney with multiple cracked tiles, displaced joints, or existing liner failure regardless of fuel type |
| HeatShield Poured-In-Place Liner | Costs $2,000–$4,000; builds new liner inside existing tiles; requires intact tile alignment; 20-year warranty; cannot be inspected after installation | Chimneys with cracked but properly aligned tiles where the existing tile structure can serve as a form |
| Clay Tile Replacement (Individual Tiles) | Costs $150–$500 per tile replaced; matches original construction; limited to accessible tiles near top or bottom; mortar cure time 7+ days | Chimneys with 1–3 damaged tiles near the top that can be accessed from the chimney top without demolishing surrounding masonry |
| Cast-In-Place (Supaflu/Ahrens) System | Costs $3,000–$6,000; creates monolithic liner with no joints; insulates the flue; adds structural strength to chimney; permanent installation | Deteriorated chimneys that need both flue repair and structural reinforcement of the masonry column |
Tools required
Skill level
Time required
When DIY saves vs when it costs more
Repair methods, liner gauge, and NFPA 211 standards
Labor rates and regional cost factors
Project scope and sizing rules by flue height
Cost drivers and code exceptions
How this is calculated
Formula: linear ft × $100–$300/linear ft flue liner repair (BLS OEWS 47-4011)
| Input | Value | Unit |
|---|---|---|
| Flue height | 20 | linear ft |
| Grade | 2 |
Frequently Asked Questions
How much does Chimney Flue Repair cost per linear foot?
$100–$300 per linear foot depending on method: joint tuckpointing at $100–$150/lft, cast-in-place resurfacing at $150–$200/lft, and full stainless steel liner replacement at $200–$300/lft (BLS OEWS 47-4011 chimney sweeps/repairers median $22.15/hr). A standard 20-lft flue lands at $2,000–$6,000 total across those bands.
What does a Chimney Flue Repair cost on a standard 20-foot chimney?
$2,000–$6,000 for a 20-linear-ft flue: tuckpointing the joints runs $2,000–$3,000, a HeatShield cast-in-place pour runs $3,000–$4,000, and a full stainless reline with tear-out and top plate runs $4,000–$6,000 (BLS OEWS 47-4011 median $22.15/hr). Collapsed tile requiring full demolition adds $500–$1,500 in debris removal and pushes the total toward $7,500.
Why is a stainless steel Chimney Flue Repair more expensive than tuckpointing?
$200–$300/lft for stainless versus $100–$150/lft for tuckpointing because stainless includes tile tear-out, a UL 1777 listed 316Ti or 304 insert, insulation wrap where NFPA 211 clearances require it, and a sealed top plate. Tuckpointing only repacks eroded mortar joints between intact clay tiles using a $15–$30 bag of refractory mortar — no liner material and no demolition labor.
What stainless liner gauge does a Chimney Flue Repair need for a wood stove?
0.020-in stainless for high-burn wood stoves per NFPA 211, versus 0.016-in for gas and light wood use. The heavier gauge survives flue-gas temperatures past 1,000°F and must carry a UL 1777 listing sized to the appliance collar, adding $8–$12/lft for the required insulation wrap.
Is Chimney Flue Repair different from chimney masonry shell repair?
Yes — Chimney Flue Repair is interior liner work at $100–$300/lft, while exterior masonry shell repair runs $500–$1,200 per section on the chimney-repair-cost-calculator. Spalled brick, a cracked crown, and a rusted chase cover all fall under the exterior shell scope and add $300–$800 each; both interior and exterior repairs are frequently needed at once on a neglected chimney.
Does a Chimney Flue Repair require a permit and inspection?
$75–$250 for the permit in most 2021 IRC jurisdictions whenever the reline serves a fuel conversion or solid-fuel appliance. A UL 1777 liner pulls a rough and final inspection, and a failed final costs $50–$100 in re-inspection fees plus the crew's return trip at $90–$140/hr.
Sources
- BLS OEWS 47-4011 Construction and Building Inspectors — verified 2025-04, updates annual