Chimney Repair Cost Calculator

What this calculator estimates

This calculator quotes the all-in installed price for 2026 US chimney repair, broken out by line item the way real mason and chimney-sweep crews invoice. Pick only the line items relevant to your repair — most jobs combine two or three:

• Crown rebuild — full cast-in-place concrete crown with overhang and expansion joint
• Tuck-pointing — per sq ft of repointed chimney face
• Brick replacement — per spalled brick removed and replaced
• Above-roof rebuild — per linear foot of chimney height rebuilt brick-by-brick
• Cap replacement — stainless cap with spark-arrestor mesh
• Flue liner — clay tile, stainless steel insert (ULC S635), or cast-in-place
• Siloxane waterproofing — 7 to 10 year water-repellent seal
• Top-mount damper — replacement damper at the chimney top

A $325 minimum service call applies in most US metro markets — chimney work requires mobilizing a two-person crew with ladders, harnesses, and tools, which sets the floor regardless of scope.

How to use it

1. Count chimneys that need repair. Each gets its own line item bundle.
2. Pick chimney size — small (single flue), medium (default), large or oversize. Size scales the masonry-area-dependent line items.
3. Set storey count — single-storey is 1.0x labour, two-storey 1.2x, three-storey or higher 1.45x.
4. Set access difficulty — easy (drive-up) is 1.0x, moderate (rear garden) 1.1x, hard (lift required) 1.3x.
5. Toggle crown rebuild if the existing crown is visibly cracked or spalled.
6. Enter tuck-pointing square footage — typically 20 to 60 sq ft on a single-storey chimney needing a partial repoint above the roof line.
7. Count replacement bricks if individual bricks are spalled (face flaked off).
8. Enter above-roof rebuild feet if the upper portion is being taken down and rebuilt brick-by-brick (typical when 30% or more of the bricks have failed).
9. Toggle new cap — almost always recommended when a crown is rebuilt.
10. Pick liner type and length if relining is part of the scope.
11. Toggle waterproofing, damper replacement, permit, disposal, weekend premium, and any extra carpentry hours.

Typical 2026 US chimney repair cost ranges

These ranges reflect 2026 nationwide pricing pulled from HomeAdvisor, Angi True Cost Report, NCSG (National Chimney Sweep Guild) contractor surveys, and Q1 2026 quotes from major US metros.

Add 20% for two-storey access, 45% for three-storey or higher. Add 10% to 30% for moderate to hard access (no drive-up).

Cost drivers

Chimney size and exposed face area. A 24x24 inch single-flue chimney has roughly 8 sq ft of face area per linear foot of height. A 36x48 inch double-flue chimney is 14 sq ft. Tuck-pointing, brick-replacement, and above-roof rebuild scale linearly with this.

Mortar specification. Modern Type N mortar (1:1:6 cement-lime-sand) is correct for chimneys built since 1930. Pre-1930 chimneys typically used lime mortar; using modern Type N or Type S in them will spall the bricks themselves. A proper assessment identifies historic mortar and specifies a matched lime-based mix, which a generalist may not even price.

Mortar joint condition. Sound mortar requires 30 minutes per sq ft to grind, repack, and tool. Crumbling mortar with deeply receded joints requires 50 to 60 minutes per sq ft and adds $5 to $8 per sq ft to the price.

Crown construction. A correctly rebuilt crown is 3 inches thick, reinforced with steel mesh, has a 2-inch overhang past the brick face creating a drip edge, and includes an expansion joint where it meets each flue tile. Crowns built without these details fail within 5 to 8 years. Always insist your contractor’s quote names the crown overhang dimension and the expansion-joint detail.

Brick matching. Replacement bricks on a 60+ year-old chimney must be color- and texture-matched, which often means salvaged or specialty-stamped reproduction bricks at $4 to $9 each in 2026 versus $0.80 to $1.50 for stock bricks.

Liner specification. A stainless steel liner sized incorrectly for the connected appliance will fail to draft properly and condense flue gases inside the liner, corroding it from the inside. Sizing is governed by the appliance manufacturer’s spec for the flue collar dimension. Insulated liners (with a 1/4-inch ceramic fiber wrap) are required for most modern wood-burning inserts.

Access. Two-storey work requires 28 to 32 ft extension ladders with stand-off stabilizers and OSHA-compliant fall protection above 6 ft (29 CFR 1926.501). Three-storey work commonly needs scaffold rental ($150 to $400 per day) or a powered lift ($350 to $750 per day).

Carpentry repair. Failed chimney flashing or persistent water entry usually means rotted sheathing under the flashing — every 10 sq ft of sheathing replacement adds $150 to $280.

US code, standards, and certifications

• IRC R1001 / R1003 — Masonry fireplaces and chimneys requirements.
• IRC R1003.9 — Chimney crown construction.
• IRC R1003.10 — Chimney crickets required on chimneys wider than 30 inches.
• IRC R1003.20 — Chimney flashing.
• NFPA 211 — Standard for chimneys, fireplaces, vents, and solid fuel-burning appliances.
• ASTM C270 — Mortar for unit masonry.
• UL 1777 / ULC S635 — Stainless steel liner listings.
• CSIA (Chimney Safety Institute of America) certification for chimney sweeps.
• NCSG (National Chimney Sweep Guild) membership and code of ethics.
• NFPA 211 12.1 — Annual chimney inspection requirement.
• OSHA 29 CFR 1926.501 — Fall protection above 6 ft.

A CSIA-certified sweep should be your first point of contact for any chimney repair quote — they perform Level I (visual), Level II (camera scan after change of system), and Level III (invasive) inspections that diagnose what actually needs repair versus what a generalist contractor may upsell.

Diagnostic step-by-step before quoting

1. Inspect from the ground with binoculars — look for white efflorescence (water migration), spalled brick faces, visible crown cracks, and missing or rusted cap.
2. Check interior ceiling and wall around the chimney for water staining — a sign of failed flashing or crown.
3. Check the firebox and damper with a flashlight for fallen brick or mortar fragments — a sign of internal deterioration.
4. Have a CSIA Level II inspection done for $250 to $450 before approving any quote over $2,000 — the camera scan documents what’s actually wrong rather than relying on the contractor’s word.
5. Get two written quotes that itemize each line item with its quantity, unit price, and total — not lump-sum bids.

Avoiding scams and overcharging

The chimney-repair market is a frequent target for door-knocker scams after wind storms. Red flags:

• “Free inspection” that finds catastrophic problems on a chimney that looked fine the week before.
• Pressure to sign before getting a written, itemized quote.
• Cash-only or wire-transfer demands.
• Refusal to provide CSIA or NCSG certification number, license, or proof of insurance.
• Upselling from a $1,500 crown rebuild to a $14,000 full rebuild without a written Level II camera inspection report.

Always insist on a Level II inspection report before authorizing any repair over $2,000. Get CSIA certification numbers and verify them at csia.org. Get insurance and license proof before any work begins.

Related calculators and guides

• Chimney flashing cost calculator — when only the flashing assembly needs replacement
• Roof flashing cost calculator — when scope extends to step, valley, drip edge, and headwall
• Roof leak repair cost calculator — when chimney failure has caused interior damage

Sources: 2026 HomeAdvisor Chimney Repair Cost Guide; Angi 2026 True Cost Report; IRC 2024 R1001 / R1003 / R1003.9 / R1003.10 / R1003.20; ASTM C270; NFPA 211; CSIA Chimney Safety Institute of America; NCSG National Chimney Sweep Guild; OSHA 29 CFR 1926.501.