Chimney Liner Installation Cost Calculator

In 2026, chimney liner installation (relining) typically costs $65 to $200 per linear foot installed, with a full reline commonly running $1,500 to $5,000 and most homeowners paying around $2,500 to $3,500. Since chimney liners are priced by the flue height (most residential chimneys are 15-35 ft), a shorter flue with an economical liner can be $1,000-$2,000, while a tall chimney with a premium liner (clay tile or cast-in-place), repairs, and add-ons can exceed $6,000-$8,000. The cost depends mainly on the flue height in linear feet (the biggest driver), the liner type (an aluminum flex liner for gas is the cheapest, a stainless flexible liner is the common all-around choice, a stainless rigid liner is a bit more, a clay/ceramic tile liner is more, and a cast-in-place liner is the most), the appliance the flue serves (a gas furnace or oil boiler flue is a bit less, an open fireplace is the baseline, and a wood stove costs more because it needs an insulated liner), the chimney access (a straight, easy run vs offsets or a tall, difficult chimney), and any existing chimney repairs needed before lining. A chimney liner is the conduit inside the chimney that contains the combustion products (smoke, gases, heat) and safely channels them out — protecting the chimney masonry and the home from heat and corrosive byproducts. Relining is needed when the existing liner is cracked, deteriorated, or missing, when installing a new appliance (a wood stove insert, a gas furnace) that requires a properly-sized liner, or to bring a chimney up to code. The most common modern liner is a stainless steel flexible liner, which is run down the chimney and connected to the appliance, often with an insulation wrap. The work involves inspecting the chimney, sizing the liner to the appliance, running the liner down the flue, connecting it, sealing the top with a top plate and cap, and any needed masonry repairs. Add-ons like liner insulation, a new chimney cap, a crown seal/repair, a camera inspection, a sweep before lining, and the appliance connection/tee add to the total. Pricing varies by region, the liner material, the chimney height/complexity, and the contractor. A simple stainless flex reline is at the lower end, while a tall clay-tile or cast-in-place job with repairs is at the higher end. This calculator lets you set the flue height, liner type, appliance, and access to estimate your project. A proper chimney liner is essential for safe, efficient venting.

A chimney liner (flue liner) is the conduit inside the chimney that contains and channels the byproducts of combustion — smoke, gases, and heat — safely up and out of the home, and it's important because it protects the chimney masonry and your house from heat transfer and corrosive byproducts, contains the combustion gases (preventing leaks of carbon monoxide), and improves the chimney's efficiency and safety. Without a proper liner, a chimney is unsafe to use. What a chimney liner is: a liner is the inner channel of the chimney (the flue) that the smoke/gases travel up through. It can be: Clay tile — traditional masonry chimneys have clay/ceramic tile liners (rectangular or round tiles stacked inside the chimney). Common in older homes. Metal (stainless steel) — modern liners are often stainless steel (flexible or rigid) — run down the chimney, especially for relining or connecting an appliance. Cast-in-place — a poured masonry liner that forms a smooth, insulated, reinforcing liner inside the chimney. The liner runs the height of the chimney, from the appliance (fireplace, stove, furnace) to the top. Why it's important: Protects the home from heat — the liner contains the high heat of the combustion gases, preventing it from transferring to the chimney masonry and nearby combustible materials (framing, walls). Without a liner (or with a damaged one), heat can reach combustibles and cause a house fire. A critical safety function. Contains combustion gases — the liner contains the toxic combustion gases (including carbon monoxide) and channels them safely out — preventing them from leaking through cracks in the masonry into the home. Protects against carbon monoxide poisoning. Protects the masonry — the combustion byproducts (especially from wood and the acidic condensation from gas) are corrosive — they deteriorate the chimney masonry and mortar over time. The liner protects the masonry from this corrosion, extending the chimney's life. Proper sizing/efficiency — a correctly-sized liner (matched to the appliance) ensures a proper draft (the chimney pulls the gases up efficiently) — for good appliance performance and complete venting. An oversized or undersized flue causes draft and efficiency problems. Required by code — building/fire codes require a proper, intact liner for a chimney to be used safely (and for connecting most appliances). Why relining is needed: Cracked/deteriorated liner — over time (or after a chimney fire, or from corrosion), clay tile liners crack, spall, or deteriorate — compromising safety. Relining (with a metal liner) restores it. No liner — older chimneys may have no liner (unsafe) — relining adds one. New appliance — installing a wood stove insert, a gas furnace, or a new appliance often requires a properly-sized liner (relining to match). Resizing — changing appliances may require a different flue size (relining). Code/inspection — a failed inspection (cracked liner) requires relining. The bottom line: the liner is essential for safe chimney operation — it prevents house fires (heat), prevents carbon monoxide leaks (gases), protects the masonry (corrosion), and ensures proper venting (draft). A chimney with a damaged or missing liner should not be used until relined. Considerations: a chimney liner is the inner flue conduit that safely channels combustion smoke, gases, and heat out of the home — important because it protects against house fires (containing heat), carbon monoxide leaks (containing gases), masonry deterioration (corrosion), and ensures proper draft. A damaged/missing liner is unsafe and needs relining. This calculator estimates relining. So a chimney liner is the conduit inside the chimney that contains and vents the combustion byproducts (smoke, gases, heat) safely out of your home — and it's critically important for fire safety, carbon monoxide protection, masonry preservation, and proper venting. A cracked, deteriorated, or missing liner makes the chimney unsafe to use and should be relined. Have your chimney inspected and relined if needed for safe operation.

The best chimney liner type depends on your situation — but for most relining jobs, a stainless steel liner (especially flexible) is the most popular and versatile choice (durable, works for all fuel types, and relatively easy to install), while clay tile is traditional (best for new masonry chimneys), and cast-in-place is premium (best when the chimney also needs structural reinforcement). Here's the comparison. Stainless steel liners (flexible or rigid): Best for — relining existing chimneys, connecting appliances (wood stoves, gas, oil), and most retrofit situations. The most common modern choice. Flexible — a flexible stainless liner bends to navigate offsets/bends in the chimney, making it easier to install in existing chimneys (the most common for relining). Rigid — a rigid stainless liner (straight sections) is used for straight chimney runs (slightly smoother/durable, but can't navigate bends). Pros — durable (a quality liner with a good warranty lasts decades, often lifetime), works for all fuel types (wood, gas, oil — with the right grade), relatively quick to install, can be insulated for better performance, and good for resizing to an appliance. Versatile and reliable. Cons — a mid-range cost (more than aluminum, less than tile/cast-in-place); quality matters (use a proper grade — 316 stainless for wood/oil, etc.). Grades — 316Ti or AL-29-4C for wood/solid fuel and oil; 304 for some gas. Match the grade to the fuel. Aluminum (a note) — aluminum flex liners are the cheapest but are only for certain gas appliances (not for wood/oil — they'd corrode). Limited use. Clay tile liners: Best for — new masonry chimney construction (built into the chimney as it's built), and traditional masonry chimneys. Pros — traditional, durable (lasts decades if not damaged), inexpensive material, good for new construction. The classic masonry liner. Cons — hard/expensive to install in an existing chimney (relining with tile means breaking into the chimney) — so it's mainly for new builds, not retrofits. Brittle (cracks from chimney fires, heat, or settling). Doesn't handle rapid temperature changes as well. For relining, metal is usually preferred over tile. Cast-in-place liners: Best for — chimneys that need structural reinforcement along with a new liner (deteriorated masonry chimneys), and a permanent, insulated liner. Pros — creates a smooth, seamless, insulated liner that also reinforces/strengthens the chimney structure (a poured masonry mix fills and lines the flue). Excellent insulation and draft, very durable (decades/lifetime), works for all fuels, and improves a deteriorating chimney's integrity. Cons — the most expensive option, and a more involved installation. A premium choice. How to choose: Relining an existing chimney — usually a stainless steel flexible liner (versatile, durable, navigates bends, all fuels). The go-to for most relining. New masonry chimney — clay tile (built-in) or stainless. Deteriorating chimney needing reinforcement — cast-in-place (lines and strengthens). Gas appliance only (budget) — aluminum flex (cheapest, gas-only) or stainless. Match the fuel — ensure the liner is rated for your fuel (wood/oil need stainless 316 or cast-in-place, not aluminum). Most common recommendation: for relining, a stainless steel flexible liner (proper grade, insulated) is the most popular, versatile, and cost-effective choice for most homeowners — durable, all-fuel, and navigates existing chimneys. Considerations: stainless steel (especially flexible) is the best all-around liner for relining (durable, versatile, all fuels, navigates bends), clay tile is best for new masonry construction, and cast-in-place is best when the chimney also needs reinforcement. Match the liner grade to the fuel. This calculator includes all these types. So for most relining jobs, a stainless steel flexible liner is the best choice (durable, works for all fuels, and fits existing chimneys with bends), while clay tile suits new masonry chimneys and cast-in-place suits chimneys needing structural reinforcement. Match the liner to your chimney, fuel, and situation — and use the proper stainless grade for wood or oil. A chimney pro can recommend the right liner.

You need to reline your chimney when the existing liner is cracked, deteriorated, or missing, when you're installing a new appliance (a wood stove, insert, gas furnace, or boiler) that requires a properly-sized liner, after a chimney fire, or when an inspection reveals the liner has failed — relining restores safe, code-compliant venting. Here's when relining is needed. Common reasons to reline: Cracked or deteriorated liner — the most common reason: the existing clay tile liner has cracked, spalled, or deteriorated (from age, a chimney fire, moisture, or the corrosive combustion byproducts). Cracks let heat and gases escape (a fire and carbon monoxide risk) — relining (usually with stainless) restores safety. After a chimney fire — a chimney fire often cracks or damages the tile liner (the intense heat) — even if the chimney looks okay, the liner should be inspected (a camera inspection) and relined if damaged. A common post-fire need. Installing a new appliance — when adding or replacing an appliance: Wood stove / insert — a wood stove or fireplace insert requires a properly-sized stainless liner connected to it (the original fireplace flue is too large) — relining to size. Gas furnace / appliance — a new high-efficiency furnace or gas appliance may need a different (often smaller, or stainless) liner — relining to match. Oil to gas conversion — switching fuels often requires relining (different flue requirements). New appliances usually require a correctly-sized, connected liner. No existing liner — older chimneys may have no liner at all (unsafe) — relining adds one for safe use. Failed inspection — a chimney inspection (Level 2, often with a camera) that reveals a cracked, gapped, or deteriorated liner requires relining before use. Resizing for draft — if the flue is the wrong size for the appliance (causing draft/performance issues), relining to the correct size fixes it. Corrosion (gas/oil) — the acidic condensation from gas/oil appliances can corrode masonry liners — relining with stainless protects it. Code compliance — bringing a chimney up to current code (for a sale, an appliance install, or insurance) may require relining. Signs you may need relining: Visible cracks or pieces of clay tile (flue tile shards) in the fireplace/cleanout. White staining (efflorescence) or moisture issues. Draft problems (smoke entering the room, poor draw). A failed or recommended-relining inspection. After a chimney fire. Adding/changing an appliance. Smoke or odor leaking into the home. The importance: a damaged or missing liner is a serious safety hazard (house fire, carbon monoxide) — so relining when needed is essential for safe operation. Don't use a chimney with a known cracked/missing liner until it's relined. How it's determined: a professional chimney inspection (especially a Level 2 with a camera scan of the flue) determines the liner's condition and whether relining is needed. This is the reliable way to know. Considerations: reline your chimney when the existing liner is cracked/deteriorated/missing, after a chimney fire, when installing a new appliance (wood stove, insert, furnace) needing a sized liner, when an inspection reveals liner failure, or for code compliance. A camera inspection determines the need. Relining restores safe venting. This calculator estimates relining. So you need to reline your chimney when the liner is cracked, deteriorated, or missing, after a chimney fire, when installing a new appliance that requires a properly-sized liner, or when an inspection reveals the liner has failed. A professional camera inspection confirms the need. Relining restores safe, code-compliant venting — don't use a chimney with a damaged or missing liner until it's done. Get an inspection if you suspect liner problems.

Insulating a chimney liner is often recommended (and sometimes required) — it improves draft, keeps the flue warmer (reducing creosote buildup and condensation), boosts efficiency, and adds a layer of safety — and the liner size must be matched to your appliance (the appliance's flue outlet and the manufacturer's specs determine the diameter), which a chimney professional sizes correctly. Here's what to know. Liner insulation: Why insulate — Better draft — an insulated liner keeps the flue gases warmer, which improves the draft (the chimney pulls better), especially important for exterior chimneys (on an outside wall, which run colder) and tall chimneys. Less creosote — for wood-burning, a warmer flue means less creosote condensation/buildup (creosote forms when flue gases cool) — improving safety (less fire risk) and reducing cleaning frequency. Less condensation — for gas/oil, insulation reduces acidic condensation (which corrodes the liner/masonry). Efficiency — a warmer, better-drafting flue improves appliance efficiency and performance. Safety clearance — insulation reduces the heat transferred to the surrounding masonry/structure (a safety benefit), and may be required to meet clearance-to-combustibles codes (especially for an undersized chimney chase or zero-clearance situations). Required sometimes — insulation is required in some cases (by code, by the liner manufacturer's listing, or for clearance) — for example, certain wood stove installations or when the chimney doesn't meet clearance requirements. A pro knows when it's required. Types — insulation can be a wrap (a blanket wrapped around the liner before insertion) or a pour-down insulation mix (poured around the liner in the chimney). The wrap is common for flexible liners. Recommendation — for wood-burning especially (and exterior/tall chimneys), insulating the liner is highly recommended (and often required). For interior gas liners, it may be optional but still beneficial. It's a worthwhile upgrade for performance and safety. Liner sizing: Match to the appliance — the liner diameter (size) must be matched to the appliance it serves: Appliance specs — the appliance manufacturer specifies the required flue/liner size (diameter) — e.g., a wood stove with a 6-inch flue outlet needs a 6-inch liner. Follow the appliance's listing. Proper draft — a correctly-sized liner ensures proper draft: too large (oversized) and the gases cool and draft poorly (and more creosote); too small (undersized) and it restricts flow. The right size matters for performance and safety. Fireplaces — for an open fireplace, the flue is sized to the fireplace opening (a ratio, typically ~1:10 to 1:12 of the opening area) — a pro calculates it. Inserts/stoves — sized to the appliance outlet (commonly 6-inch or 8-inch for wood stoves). Codes/standards — sizing follows codes (and the appliance listing). A pro sizes it correctly — a chimney professional determines the correct liner size based on the appliance, the chimney, and codes — ensuring proper draft and safe, efficient operation. Don't guess; have it sized. The bottom line: insulating the liner is often recommended (and sometimes required) for better draft, less creosote/condensation, efficiency, and safety — especially for wood-burning and exterior/tall chimneys. And the liner size must match the appliance (per its specs and codes), which a pro sizes. Both ensure safe, efficient venting. Considerations: chimney liner insulation is often recommended/required (improving draft, reducing creosote and condensation, boosting efficiency and safety — especially for wood and exterior chimneys), and the liner size must be matched to the appliance (per the manufacturer's specs and codes, sized by a pro). This calculator includes an insulation add-on. So insulating your chimney liner is often recommended (and sometimes required) — it improves draft, reduces creosote and condensation, and adds safety, especially for wood-burning and exterior or tall chimneys — and the liner size must be properly matched to your appliance's specifications (sized by a professional for correct draft). Both insulation and correct sizing ensure safe, efficient venting. Have a chimney pro size and insulate it appropriately.

Chimney liner installation typically takes 4 to 8 hours (most relines are completed in a single day), depending on the chimney height, the liner type, the access, and any repairs needed — and it absolutely should be done by a professional (a certified chimney technician), given the safety-critical nature, the rooftop work, the proper sizing/installation, and the code requirements. This is not a recommended DIY project. How long it takes: Standard reline — installing a stainless steel flexible liner in a typical chimney is usually 4-8 hours (a single day): inspecting/sweeping the flue, sizing and preparing the liner (and insulation), running the liner down the chimney from the top, connecting it to the appliance, sealing the top with a top plate and cap, and finishing. Most relines are a one-day job. Faster — a short, straightforward flue (easy access, no repairs) can be done in a few hours. Longer — a tall chimney, a difficult/offset run, a cast-in-place liner (which involves pouring and curing), or needed masonry repairs can extend it to a full day or more (cast-in-place and repairs especially). With repairs — if the chimney needs masonry repairs (crown, brickwork) before lining, that adds time (and possibly cure time). Cast-in-place — a cast-in-place liner takes longer (forming and pouring the liner, plus curing). The factors: the chimney height, the liner type (flex is quick; cast-in-place is longer), the access/complexity (offsets, height), the appliance connection, insulation, and any repairs. Most standard stainless relines are a single-day job. Do you need a professional: Yes — definitely. Chimney relining should be done by a professional (a certified chimney technician, e.g., CSIA-certified) because: Safety-critical — the liner is a critical safety component (fire and carbon monoxide protection). Improper installation (wrong size, poor connection, gaps, wrong grade) can be dangerous (fire, CO leaks). It must be done right. Proper sizing — the liner must be correctly sized to the appliance and code (a pro determines this) — critical for draft and safety. Rooftop work — installation involves working on the roof and chimney top (running the liner from the top) — which has fall risks and requires proper equipment/safety. Code compliance — relining must meet building/fire codes and the liner manufacturer's listing (proper grade, insulation, connections, clearances) — a pro ensures compliance (and it may require a permit/inspection). Inspection/assessment — a pro inspects the chimney (often with a camera) to assess the condition, size the liner, and identify any repairs needed (crown, masonry) — ensuring the whole system is safe. Proper materials/connection — using the right liner grade (316 for wood/oil), proper insulation, a correct appliance connection (tee/connector), and a proper top termination — all require expertise. Warranty — professional installation (and quality liners) come with warranties (often lifetime on the liner) — which require professional, code-compliant installation to be valid. Why not DIY — the safety-critical function, the proper sizing/code requirements, the rooftop/height work, and the warranty/liability all make this a professional job. A DIY mistake (wrong size, bad connection, damaged liner, fall) can be dangerous or costly. The right approach: hire a certified, reputable chimney professional (CSIA-certified, insured) to inspect, size, and install the liner — ensuring a safe, code-compliant, warrantied installation. Get the chimney inspected to confirm the need and the right liner. Considerations: chimney liner installation typically takes 4-8 hours (a single day for most relines; longer for cast-in-place, tall/difficult chimneys, or with repairs), and it should be done by a certified chimney professional (for safety, proper sizing, code compliance, rooftop work, and warranty). It is not a DIY job. This calculator estimates professional installation. So chimney liner installation is usually a single-day job (4-8 hours; longer for cast-in-place, tall chimneys, or with repairs), and it should always be done by a certified chimney professional — given the safety-critical function, proper sizing and code requirements, rooftop work, and warranty. Never DIY a chimney liner. Hire a certified, insured chimney technician for a safe, lasting, code-compliant installation.