Chimney Liner Installation Cost Calculator

Chimney relining typically runs $65 to $200 per linear foot installed, so a full reline commonly costs $1,500 to $5,000 — most homeowners pay around $2,500 to $3,500. Because liners are priced by 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, repairs, and add-ons can top $6,000–$8,000. The drivers are the flue height (the biggest), the liner type (aluminum flex cheapest, stainless flexible the popular all-around choice, then stainless rigid, clay tile, and cast-in-place), the appliance served (a wood stove costs more for an insulated liner; a gas furnace flue is simpler), the chimney access, and any masonry repairs needed first. Enter your flue height, liner type, appliance, and access in the calculator to anchor the estimate.

A chimney liner (flue liner) is the conduit inside the chimney that contains and channels combustion byproducts — smoke, gases, and heat — safely up and out. It's essential for four reasons: it protects your home from heat (containing the high heat so it can't reach framing and walls and start a fire), contains toxic gases (keeping carbon monoxide from leaking through masonry cracks into the home), protects the masonry (the acidic, corrosive byproducts deteriorate brick and mortar over time), and ensures proper draft (a correctly sized liner pulls gases up efficiently for complete venting). Liners are clay tile (traditional masonry), stainless steel (flexible or rigid — the modern relining choice), or cast-in-place (poured masonry). Building and fire codes require a proper, intact liner for a chimney to be used. A chimney with a cracked, deteriorated, or missing liner is unsafe and should not be used until relined.

For most relining jobs, a stainless steel flexible liner is the most popular and versatile choice: durable (often a lifetime warranty), works for all fuels with the right grade, navigates bends/offsets in existing chimneys, and can be insulated. Stainless rigid is for straight runs (slightly smoother and sturdier, but can't bend). Aluminum flex is the cheapest but is gas-only — it would corrode on wood or oil. Clay/ceramic tile is the traditional masonry liner, best for new chimney construction (built in as the chimney is built); relining an existing chimney with tile is hard and costly. Cast-in-place is the premium option — a poured liner that's smooth, insulated, and structurally reinforces a deteriorating chimney, at the highest cost. Match the grade to the fuel (316-grade stainless for wood/oil). The calculator includes aluminum flex, stainless flexible, stainless rigid, clay tile, and cast-in-place.

Reline when the existing liner is cracked, deteriorated, or missing; after a chimney fire (the intense heat often cracks clay tile, even if the chimney looks fine); when installing a new appliance that needs a properly sized liner (a wood stove or fireplace insert, a high-efficiency gas furnace, or an oil-to-gas conversion); when an inspection reveals the liner has failed; or to bring the chimney up to code for a sale, appliance install, or insurance. Warning signs include pieces of clay flue tile in the fireplace or cleanout, white efflorescence or moisture, draft problems (smoke entering the room), and smoke or odor leaking into the home. A professional Level 2 inspection with a camera scan is the reliable way to confirm the liner's condition and whether relining is needed. Don't use a chimney with a known cracked or missing liner until it's relined.

Insulating the liner is often recommended — and sometimes required — especially for wood-burning and for exterior or tall chimneys. Insulation keeps the flue warmer, which improves draft, reduces creosote buildup (for wood) and acidic condensation (for gas/oil), boosts efficiency, and reduces heat transfer to surrounding masonry (a safety and clearance benefit). It comes as a wrap around the liner or a pour-down mix. As for size, the liner diameter must match the appliance: a wood stove with a 6-inch outlet needs a 6-inch liner, and an open fireplace flue is sized to the opening (roughly a 1:10–1:12 ratio). Too large and the gases cool and draft poorly (more creosote); too small and it restricts flow. A chimney professional sizes it correctly to the appliance and code — don't guess. The calculator includes a liner-insulation add-on.

Most relines are a single-day job, typically 4–8 hours: inspecting and sweeping the flue, sizing and preparing the liner (and insulation), running it down from the top, connecting it to the appliance, and sealing the top with a top plate and cap. A short, easy flue can be a few hours; a tall or offset chimney, a cast-in-place liner (which is poured and cured), or needed masonry repairs can take a full day or more. This is not a DIY project — it should be done by a certified chimney technician (e.g., CSIA-certified). The liner is a critical fire- and carbon-monoxide-safety component that must be the correct grade, correctly sized, and properly connected; the work involves rooftop fall risk; it must meet code and the liner manufacturer's listing; and professional, code-compliant installation is required to keep the (often lifetime) warranty valid. The calculator estimates professional installation.

Stainless liners come in different grades, and matching the grade to your fuel matters for safety and longevity. For wood and solid fuel — and for oil — you need a heavier, more corrosion-resistant grade like 316Ti or AL-29-4C, because wood smoke and oil combustion produce corrosive, acidic byproducts that would eat through a lighter liner. For gas appliances, a lighter 304-grade stainless is often acceptable since gas is cleaner-burning, and aluminum flex is only acceptable for certain gas appliances. Using too light a grade for the fuel leads to premature corrosion and failure (and can void the warranty), while the right grade can last decades or a lifetime. A reputable installer specs the grade to your fuel and appliance automatically — but it's worth confirming, especially for wood stoves. The calculator's stainless options assume a fuel-appropriate grade.

A chimney works by draft — hot gases rise and pull combustion products up and out — and the flue size has to be right for that to work. If the liner is oversized for the appliance, the gases spread out, cool down, and rise sluggishly, which weakens the draft, lets smoke linger or spill back into the room, and (for wood) causes more creosote to condense on the flue walls — a fire risk. If it's undersized, it restricts the flow the appliance needs, which can also cause poor performance and spillage of combustion gases into the home. That's why relining is often done specifically to resize a flue when a new appliance is installed — for example, putting a 6-inch stainless liner into a large old fireplace flue to serve a wood stove insert. Correct sizing is matched to the appliance's specs and code, which is one reason this is a professional job. The calculator's appliance options reflect these differences.

Often, yes — and the calculator accounts for it with a chimney-condition option. A liner goes inside the chimney, so the surrounding masonry should be sound first. If the crown (the top slab) is cracked, the brickwork or mortar is deteriorated, or there's water damage, those problems should be addressed before or during relining — water and structural issues will keep damaging the chimney (and can compromise the new liner). Minor work (a crown patch or small masonry repair) adds a modest amount, while major repairs (significant rebuilding) add more, which is why the calculator lets you set 'good,' 'minor repair,' or 'major repair.' This is also where a cast-in-place liner shines, since it lines and structurally reinforces a deteriorating chimney at once. A camera inspection before lining reveals what repairs are needed, so you fix the root issues and the new liner lasts.

Quality stainless steel liners typically carry strong manufacturer warranties — often a lifetime warranty for the original homeowner — which is a big part of their value, since a properly installed stainless liner can last the life of the home. The key catch is that these warranties almost always require professional, code-compliant installation by a qualified installer, using the correct grade for your fuel and the manufacturer's specified components (top plate, connectors, insulation where required). A DIY or improper installation usually voids the warranty — another reason this is a professional job. Cast-in-place liners are also very long-lasting and warrantied. Aluminum liners, being gas-only and less durable, carry shorter warranties. When you get a quote, ask about the liner's warranty, what it covers, and what's required to keep it valid — and keep the documentation, as it can transfer value at resale. The calculator estimates professional installation that supports these warranties.