Check for a 2-inch concrete crown overhang
A durable crown is poured from Portland concrete (never soft brick mortar) with a 2-inch drip-edge overhang and a bond break around the clay flue tile so thermal expansion doesn't crack the concrete.
Home › Chimney
Crown · Step Flashing · Tuckpointing · Roofline RebuildChimney rebuild & repair cost calculator
Most chimney leaks start at the step and counter-flashing or at a cracked crown, and those fixes need new flashing or a poured concrete crown with a drip-edge overhang—not a $14,000 tear-down. Price the targeted repair first, compare stainless flue relining vs roofline masonry rebuilds by height and flue count, and check what homeowners insurance actually covers.
Reviewed 25 October 2026 · Written by Mantu Kumar
See the illustrated inspection guide · Interactive system diagram
Written and maintained byMantu Kumar
Evidence review16 October 2026
Calculation rulesRead the methodology
Quality standardEditorial policy
Key facts at a glance
- Cap & step/counter-flashing repair runs $450–$1,600—and should be included in a roof replacement quote.
- Poured concrete chimney crown replacement (with a 2-inch drip-edge overhang and bond break) runs $700–$2,200.
- Tuckpointing / repointing weathered mortar joints above the roof runs $900–$3,200 ($12–$28 per sq ft of brick face).
- Stainless steel insulated flue liner replacement runs $2,200–$4,800 for a 20-to-30-foot chimney.
- Rebuilding a masonry chimney from the roofline up costs $900–$1,800 per vertical foot ($8,000–$21,600 for 9–12 ft), plus $800–$2,200 for pipe scaffolding at 18 ft or taller.
Sources: 2026 International Residential Code (IRC Section R1003.9), NFPA 211 Chimney & Venting Standard, and U.S. residential masonry contractor benchmarks.
2026 planning ranges
- 1Cap & spark arrestor
- 2Concrete crown · $700–$2,200
- 3Stainless flue liner · $2,200–$4,800
- 4Brick & mortar · tuckpoint or rebuild
- 5Step & counter-flashing · $450–$1,600
- 6Scaffolding for 18 ft+ stacks
- 7Permit + inspection
- 8Flue count
- 9Cricket sheds water
Rebuild above roof: About $900–$1,800 per vertical foot, more for two or three flues.
Chimney repair & roofline rebuild cost estimator
No email · nothing sentDiagram, part by part
Chimney rebuild & repair: every numbered part explained
The chimney rebuild & repair drawing above has 9 numbered parts, from Cap & spark arrestor to Cricket behind the chimney. Each card below frames one of them, and after you run the calculator it shows what that part adds to your estimate.
1 Cap & spark arrestor
Included with flashing and crown work
A metal cap with mesh sides keeps rain, birds, animals and sparks out of the flue. It is the cheapest protection a chimney can have, and a missing cap lets water run straight down the flue onto the damper and firebox.
What moves it: Number of flues, cap size and whether a multi-flue cap is needed.
On the quote: Ask for a stainless or copper cap sized to cover every flue, with the spark mesh your local code requires.
2 Concrete crown
$700–$2,200
The concrete crown is the sloped slab that caps the top of the brick and sheds water away from the flue. Cracked or flat mortar crowns let water into the masonry, where freeze-thaw cycles break bricks and joints apart from the inside.
What moves it: Chimney width, number of flues and whether the old crown has to be chipped off.
On the quote: Ask for a poured, reinforced crown with an overhang and drip edge rather than a thin mortar wash.
3 Stainless flue liner
$2,200–$4,800
A stainless steel liner inside the flue protects the masonry from heat and from the acidic condensation of modern appliances. It is often required when a new furnace, water heater or wood stove is connected to an old clay-tile flue.
What moves it: Flue height, liner diameter and whether insulation wrap is required.
On the quote: Ask for the liner diameter, whether it is insulated and the warranty, and confirm it is sized for the appliance.
4 Brick & mortar
tuckpoint or rebuild
Tuckpointing grinds out failed mortar and packs new mortar into the joints. When bricks are spalling or the stack leans, the top of the chimney is taken down and rebuilt with new brick, which costs far more but solves the cause.
What moves it: Height above the roof, number of flues and how many courses must come down.
On the quote: Ask how many courses are being rebuilt and whether the mortar is matched to the old brick.
5 Step & counter-flashing
$450–$1,600
Step flashing is woven into the shingles along the sides of the chimney and counter-flashing is cut into the mortar joints to cover it. Failed flashing is the most common cause of a chimney leak, and caulk alone over the joint does not last.
What moves it: Chimney width, roof pitch and whether a cricket is needed behind the stack.
On the quote: Ask whether the counter-flashing will be cut into the mortar joints rather than surface-sealed with caulk.
6 Scaffolding for 18 ft+ stacks
Tall chimneys, steep roofs and two-story eaves need scaffolding, roof brackets or a lift so masons can work safely and move brick. This access cost is often priced separately from the masonry.
What moves it: Stack height, roof pitch and ground access around the house.
On the quote: Ask whether scaffolding or a lift is included and who protects the roof and landscaping.
7 Permit and inspection
$150–$600
A rebuild, a new liner or a change in the appliance venting usually needs a permit, and many towns require a Level 2 chimney inspection when the flue is relined or the home is sold. The inspection checks clearances, the liner and the crown.
What moves it: Your town, the scope of work and whether an appliance is being connected.
On the quote: Ask who pulls the permit and whether a camera inspection of the flue is included.
8 Number of flues
Two flues about +28% · three about +52%
Each flue is a separate channel, one for each fireplace or appliance. A stack with two or three flues is wider, needs more brick, a larger crown and a cap for each flue, so masonry and liner work rise with the flue count.
What moves it: How many fireplaces and appliances vent through the stack.
On the quote: Ask which flues are still in use and whether unused flues can be capped instead of lined.
9 Cricket behind the chimney
Usually priced with flashing
A cricket is a small peaked roof built on the uphill side of a chimney wider than about 30 inches. It splits rain and snow around the stack so water does not pool against the brick. Many codes require one on wide chimneys.
What moves it: Chimney width and roof pitch.
On the quote: Ask whether a cricket is needed and whether it is included in the flashing price.
Roofline inspection guide
Separate a $950 flashing or crown leak from a $14,000 roofline rebuild
Because homeowners rarely climb onto the roof to inspect the top of their chimney, unethical contractors sometimes quote a full roofline tear-down when only the mortar wash crown or step flashing has failed.
Three parts of the same picture, each tied to a line on a chimney rebuild & estimate. These close-ups are crops of the same AI-generated illustration.
Test whether brick faces are solid or flaking
If the bricks ring solid when tapped and only the mortar joints are powdery or recessed, grinding and tuckpointing ($900–$3,200) restores the stack. If brick faces are popping off (spalling), the courses must be rebuilt.
Reject roof tar smeared over old flashing
Code-compliant chimney flashing uses individual L-shaped metal step flashing woven into every shingle course, covered by metal counter-flashing saw-cut and pinned into the mortar joint—never black roof cement smeared on brick.
Before you sign a quote or file a claim, verify these three details
- Starting brick course
- Whether a partial rebuild starts at the roofline flashing or partway up the stack, and the exact brick/course count included
- Flue liner & NFPA 211
- Whether an NFPA 211 Level 2 internal video camera scan was performed and whether clay tiles or a 316Ti stainless liner are included
- Mortar compatibility
- Whether Type N or lime mortar is specified for older softer brick (hard Type S mortar cracks historic brick during freeze-thaw cycles)
On this page
- 2026 chimney repair & rebuild cost by job
- How to diagnose chimney leaks & spalling
- IRC 3-2-10 height rule, crickets & NFPA 211 inspections
- Worked example: 12-foot single-flue rebuild vs crown repair
- When homeowners insurance pays vs maintenance exclusions
- Sources and further reading
- Frequently asked questions
Chimney repair and rebuild cost by scope (2026)
Pricing a chimney project accurately depends on whether the failure is limited to the top weather cap (crown and spark arrestor), the roof intersection (step flashing, counter-flashing, and cricket), the internal exhaust pathway (clay flue tiles or stainless steel liner), or the structural brick courses. Masonry is slow, hand-laid work at height, so most of a rebuild quote is labor, scaffolding and roof access rather than brick and mortar. Typical 2026 planning ranges by scope:
| Chimney Scope | 2026 Unit Rate | Typical Project Total | When This Scope Applies |
|---|---|---|---|
| Stainless Steel Chimney Cap / Damper Cap | $150 – $450 / flue | $250 – $750 | Keeps rain, birds, raccoons and downdrafts out of the open flue tile |
| Step Flashing & Counter-Flashing Reglet | $450 – $1,600 / stack | $450 – $1,600 | Water staining on attic rafters or ceiling right around the chimney base |
| Chimney Cricket / Saddle Installation | $650 – $1,850 | $650 – $1,850 | Required by IRC R1003.20 when a chimney is 30+ inches wide perpendicular to roof slope |
| Poured Concrete Crown Replacement | $700 – $2,200 / crown | $700 – $2,200 | Top mortar wash is cracked or lacks a 2-inch drip-edge overhang, letting water into brick cores |
| Tuckpointing / Repointing Above Roofline | $12 – $28 / sq ft | $900 – $3,200 | Mortar joints are recessed or sandy (>1/4" deep), but brick faces remain solid and un-spalled |
| Insulated Stainless Steel Flue Liner | $85 – $160 / linear ft | $2,200 – $4,800 (25 ft) | Cracked clay flue tiles, unlined historic flue, or converting to a high-efficiency gas/wood insert |
| Partial Roofline Rebuild (Top 4–6 ft) | $900 – $1,800 / vertical ft | $3,600 – $9,500 | Top 15 to 25 courses of brick are spalled from freeze-thaw below a failed crown |
| Full Roofline-Up Rebuild (10–16 ft · 1–2 Flues) | $900 – $1,800 / vertical ft | $9,000 – $24,000+ | Entire stack above the roof is leaning, spalled, or storm-shifted; add $800–$2,200 for scaffolding at 18 ft+ |
| Complete Ground-Up Chimney & Firebox Rebuild | $1,100 – $2,200 / vertical ft | $18,000 – $42,000+ | Exterior wall chimney settling on a failed footing or severe earthquake/tree collapse |
How to diagnose chimney leaks, white staining (efflorescence) and spalling bricks
Because water travels downward along rafters and flue tiles before dripping onto your living room ceiling or fireplace hearth, homeowners frequently misdiagnose the entry point. Use this diagnostic matrix before approving a mason's proposal:
| Visible Symptom | Underlying Physical Cause | Correct Repair Scope | 2026 Planning Cost |
|---|---|---|---|
| Water dripping inside attic around chimney framing during rain | Rusted L-step flashing, lifted shingles, or caulked surface flashing pulling away from brick | Remove surrounding shingles; weave new aluminum/copper step flashing + reglet counter-flashing | $450 – $1,600 |
| White powdery salt stains (efflorescence) on exterior brick | Moisture soaking into brick courses through a cracked crown or missing cap and evaporating outward | Repair crown/cap leak source first, dry masonry, clean salts, and apply breathable siloxane water repellent | $350 – $950 + crown fix |
| Top 4–6 courses of brick flaking or popping faces onto the roof | Freeze-thaw spalling: water enters through a cracked mortar crown and expands 9% when freezing | Rebuild the spalled top courses with matching brick and form a new poured concrete overhanging crown | $2,800 – $6,800 |
| Mortar joints crumble when scratched with a key, but bricks are solid | Normal 25-to-40-year weathering of softer lime/Type N mortar joints on windward sides | Grind mortar joints to 3/4-inch depth and tuckpoint with strength-matched mortar | $900 – $3,200 |
| Water pooling on firebox hearth floor or rusted damper handle | Open uncapped flue tile or cracked crown bond gap around the top flue tile | Install a stainless steel multi-flue or single-flue chimney cap and seal the crown-to-flue expansion gap | $250 – $850 |
IRC R1003.9 (the 3-2-10 height rule), crickets and NFPA 211 Level 2 inspections
When a chimney is rebuilt from the roofline up, building inspectors verify three mandatory code checkpoints under Chapter 10 of the International Residential Code (IRC) and the NFPA 211 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances:
- The 3-2-10 Chimney Height Rule (IRC Section R1003.9): Every masonry chimney must extend at least 3 feet above the highest point where it passes through the roof, and at least 2 feet higher than any portion of the building or roof ridge within 10 feet horizontally. Rebuilding a short chimney without meeting the 3-2-10 rule causes dangerous downdrafts, smoke roll-out, and failed final inspections.
- Mandatory Chimney Cricket / Saddle (IRC Section R1003.20): Any chimney more than 30 inches wide measured perpendicular to the roof slope must have a framed ridge saddle (cricket) on the upper roof side to divert rainwater and snow load around the brickwork.
- NFPA 211 Level 2 Video Camera Inspection ($250–$550): Required whenever you buy or sell a home, change fuel types, or experience a chimney fire, lightning strike, or windstorm shift. A certified sweep runs a 360-degree HD camera down the flue to check for cracked clay liner tiles or missing mortar joints between flue sections that cannot be seen from the roof.
Worked example: 12-foot single-flue roofline rebuild vs crown repair
The stack above the roof is 12 feet tall, one flue, with freeze-thaw spalled bricks and cracked clay flue tiles replaced from the roofline up. Because the stack above the roof is under 18 feet, the tall-tower scaffold adder does not apply:
12 ft single-flue roofline rebuild vs crown-only job
Worked example| Line Item | 2026 Planning Range |
|---|---|
| Roofline rebuild (12 vertical ft × $900–$1,800/ft · 1 flue) | $10,800 – $21,600 |
| Municipal masonry & building permit allowance | $150 – $600 |
| Full roofline rebuild planning total | $10,950 – $22,200 |
| Comparison: Poured concrete crown replacement only (sound bricks) | $700 – $2,200 |
| Comparison: Cap, step flashing & counter-flashing only | $450 – $1,600 |
Never accept a $14,000 rebuild quote for a cracked crown when the bricks below are solid—and never pay $1,200 to skim-coat a crown over spalled, hollow bricks that are already crumbling.
Does homeowners insurance cover chimney repair or a masonry rebuild?
Under standard HO-3 policies and NAIC settlement rules, coverage hinges on whether the damage was sudden and accidental versus gradual wear and maintenance:
- Covered Perils (Coverage A Dwelling): Direct lightning strikes (which frequently shatter masonry crowns and clay liners), high-wind storms that shift or topple an upper stack, falling tree limbs, vehicle impact, or a sudden internal chimney flue fire are covered perils—subject to your deductible and ACV depreciation holdback if you have an Actual Cash Value policy.
- Excluded Maintenance & Earth Movement: Freeze-thaw brick spalling over many winters, washed-out mortar joints needing tuckpointing, rusted chimney caps, and a chimney leaning away from the house wall due to footing soil settlement are excluded under wear-and-tear and earth-movement clauses.
- Roof Replacement Coordination: If storm hail or wind triggers a covered roof replacement claim, replacing the L-step flashing where the new shingles meet the chimney is part of a code-compliant reroof scope. Pair this estimator with the Hail Deductible Calculator and Claim Gap Calculator.
Sources and further reading
- ICC — IRC Chapter 10, chimneys and fireplaces
- NFPA — National Fire Protection Association
- InterNACHI — Life expectancy of home components
Frequently asked questions
How much does it cost to rebuild a chimney from the roofline up in 2026?
A single-flue masonry chimney rebuilt from the roof line up typically costs $900 to $1,800 per vertical foot ($7,200 to $21,600 for an 8-to-12-foot stack), including demolition, new brick courses, flue tiles, a poured concrete crown, and step flashing. Two-flue stacks add roughly 25% to 35%, and stacks 18 feet or taller add $800 to $2,200 for multi-stage pipe scaffolding.
How much does chimney crown replacement or repair cost?
Sealing hairline cracks in an otherwise sound concrete crown with an elastomeric brushable membrane costs $250 to $600. Breaking off a failed mortar wash and forming a new reinforced Portland concrete crown with a 2-inch drip-edge overhang and flue bond break costs $700 to $2,200.
Is chimney flashing included in a roof replacement quote?
It should be, but many budget roof quotes silently reuse old chimney flashing. Reusing bent, tarred flashing against new shingles is the #1 cause of post-reroof leaks. Always require new step flashing and reglet-cut metal counter-flashing ($450 to $1,600) in writing on your roofing contract.
When is tuckpointing enough versus a chimney rebuild?
Tuckpointing ($900 to $3,200 above the roof) is sufficient when the bricks themselves are hard and intact and only the mortar joints have eroded. Once water has frozen inside the bricks and popped their faces off (spalling), or if the stack is leaning, tuckpointing cannot restore structural integrity and the affected courses must be rebuilt.
Does homeowners insurance cover a crumbling or leaning chimney?
No. Gradual mortar deterioration, freeze-thaw spalling, and foundation settling are excluded as maintenance or earth movement. Insurance only covers chimney rebuilds when the damage is caused by a sudden covered peril such as lightning, windstorms, a fallen tree, or an accidental flue fire.
What is the 3-2-10 rule for chimney height?
Under IRC Section R1003.9 and NFPA 211, the top of a chimney must sit at least 3 feet above the highest point where it penetrates the roof deck, and at least 2 feet higher than any roof ridge, parapet, or structure within a 10-foot horizontal radius.
How much does a stainless steel chimney liner cost?
Installing an UL-listed 316Ti or 304 stainless steel flexible or rigid liner with top plate, rain cap, and insulation wrap typically runs $2,200 to $4,800 for a 20-to-30-foot residential chimney ($85 to $160 per linear foot).
Can you waterproof brick after tuckpointing or rebuilding?
Yes, but never use film-forming sealers (like Thompson's WaterSeal or latex paint) that trap interior vapor and cause rapid spalling. Masons apply a 100% vapor-permeable polysiloxane water repellent ($300 to $750) that sheds wind-driven rain while allowing the brick to breathe.
What is a chimney crown and why does it crack?
The crown is the concrete or mortar cap on top of the brick that sheds water away from the flue. Crowns built from regular mortar, too thin or without an overhang crack from freeze-thaw cycles, and water then gets into the brick below. A properly formed crown with a drip edge lasts far longer.
Related planning tools
Next steps for your estimate
The next questions after a chimney rebuild & estimate usually land on one of these.
Roof replacement cost calculatorCompare full shingle and flashing replacement when reroofing around a chimney.Roof repair cost calculatorPrice localized shingle patches, valley leaks and pipe boots alongside flashing work.Hail & wind deductible calculatorConvert a 1% to 5% wind/hail deductible into dollars after storm chimney damage.Insurance claim gap calculatorSee how masonry age and ACV vs RCV rules affect your first insurance check.Foundation repair cost calculatorPrice helical or push piers when an exterior chimney footing is settling.Should I file a claim?Test whether a wind-damaged chimney claim beats your deductible and surcharge risk.
Key topics covered
Popular chimney searches answered on this page
Direct planning topics covered in the calculator and guide above.
chimney rebuild cost calculatorcost to rebuild chimney from roofline upchimney crown replacement cost 2026chimney step and counter flashing costtuckpointing chimney cost per square footstainless steel chimney liner cost3-2-10 chimney height rule IRC R1003.9does homeowners insurance cover chimney rebuild
chimney crown costcost to rebuild chimney above roof