Chimney Liner Replacement Cost
Chimney liner replacement costs $1,500 to $7,000 installed in 2026. Stainless steel liners ($1,500 to $4,000) are the standard for wood burning and last 15 to 25 years; cast-in-place liners ($2,000 to $7,000) suit damaged or irregular flues; aluminum liners ($900 to $1,800) are for gas venting only. A failed or missing liner is a safety issue: flue gases and heat reach the house structure.
The liner is the chimney's most important safety component and its most expensive common repair. This guide explains what liners do, what replacement costs by type, and how to know yours has failed.
What the liner does
The liner is a continuous sleeve inside the chimney that contains flue gases, protects the masonry from heat and corrosive byproducts, and sizes the flue correctly for the appliance. Without an intact liner, heat transfers to the wood framing around the chimney and carbon monoxide can seep into the house. Building codes (and NFPA 211) require a continuous, code-compliant liner for anything venting wood, gas, or oil. An unlined chimney, or one with cracked clay tiles, is not a charming rustic feature; it is a hazard.
Replacement cost by liner type
Stainless steel: $1,500 to $4,000 installed. The standard choice, suitable for all fuel types. Rigid or flexible; flexible navigates bends and offsets. For wood burning, specify lifetime-warranty 316Ti stainless; cheaper 304 stainless does not stand up to long-term creosote exposure. Lifespan 15 to 25 years. Cast-in-place (poured): $2,000 to $7,000. A cement-like mixture pumped around an inflatable form, creating a seamless insulated liner. Best for irregular flues and chimneys with existing damage; also adds structural strength. Clay tile: varies widely. The original liner in most older chimneys; replacing individual tiles runs $65 to $100 per square foot of flue, but breaking out old tiles to install new ones is labor-intensive, which is why most relines use steel instead. Aluminum: $900 to $1,800. For gas furnace and water heater venting only; never for wood.
What drives the price
Chimney height (more liner, more labor), flue diameter, bends and offsets (flexible liner or custom work), access difficulty (steep roofs, scaffolding), and whether the old liner must be broken out first. A straight 25-foot run for a wood fireplace at $2,500 to $4,500 in stainless is the textbook job; tall, offset, or damaged flues push toward $7,000.
Warranties and what they actually cover
Liner warranties vary more than the marketing suggests. Lifetime warranties on stainless liners typically cover the liner material against manufacturer defects and corrosion, not against installation errors, chimney fires caused by neglected creosote, or damage from burning inappropriate fuels. Read the terms: most require professional installation, registration within 30 to 90 days, and annual inspection records to stay valid. A lifetime warranty from a manufacturer that has been in business for three years is worth less than a 20-year warranty from an established one. Get the warranty document, not just the brochure claim, and keep your annual sweep receipts; they are the proof of maintenance the warranty requires.
Signs your liner has failed
White staining on the exterior brick near the top (condensate leaking through), bits of clay tile in the firebox or cleanout, smoke or odors entering rooms, poor draft that is new, and any chimney fire history. A Level 2 camera inspection ($200 to $1,000) confirms it visually; this is the standard diagnostic and the one you want before authorizing thousands in work.
Repair vs reline vs rebuild
Minor tile damage in an otherwise sound flue can sometimes be repaired with heat-resistant refractory mortar. Widespread tile cracking, missing tiles, or an unlined flue mean a full reline. If the masonry structure itself is failing (leaning, severely spalled), reline after the masonry is rebuilt; a new liner in a collapsing chimney is money wasted. The camera inspection sequences these decisions correctly.
The bottom line
Budget $1,500 to $4,000 for a stainless reline on a typical chimney and up to $7,000 for complex or cast-in-place jobs. Get the camera inspection first, specify the alloy and warranty in writing, and treat a failed liner as a no-burn situation until it is fixed.
Figures current as of October 2026. Sources: HomeGuide 2026 cost data, Angi 2026 averages, Chimney Safety Institute of America (csia.org).