Chimney Liner & Rebuild Cost - Inspected on Camera, Then Priced in Writing

Every visit starts with

Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed

Worth knowing

Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.

Styles & brands we work with

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Before & after – our own jobs

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How Much Does Chimney Liner & Rebuild Cost in Brentwood?

Chimney liner installation in Brentwood, NY typically runs $1,800 to $5,500, depending on liner type, flue length, and whether any masonry work is needed. A full chimney rebuild – tearing down and relaying the brick or block above the roofline – adds $3,500 to $9,000 on top of that, though most Brentwood homeowners are dealing with partial rebuilds in the $1,200 to $4,000 range. Get the right diagnosis first and you may not need the higher end of either range.

Wendell Pike has been working chimneys on Long Island since 1999, and the calls he gets out of Brentwood are pretty consistent: a homeowner who has been putting off a liner replacement since a chimney sweep flagged it two years ago, or someone who just had a Level 2 inspection after buying a house on one of the older streets off Brentwood Road. If that sounds like your situation, this guide will give you honest numbers before anyone shows up at your door.

Chimney Liner & Rebuild Cost Breakdown (2026)

These ranges reflect what Top Hat Chimney quotes for work in Brentwood and the surrounding Suffolk County area as of 2026. They account for material costs, labor, and standard access. Jobs with unusual height, severe deterioration, or interior access problems can push toward or past the high end.

A few things push the number up quickly. Brentwood has a large share of split-levels and two-story colonials with longer-than-average flue runs – a 35-foot flue on a two-story colonial costs noticeably more to reline than a standard 25-foot run on a ranch. If the existing clay tile liner has collapsed or blocked the flue, the debris has to come out before the new liner goes in, and that adds labor. If the chimney has been leaking into the masonry for a few seasons, which is common on homes built in the 1960s and 70s around the Brentwood area, you may find that soft, spalled brick needs to be replaced before the liner work even starts.

On the other end, straightforward jobs – a gas boiler with a clean, accessible flue and no masonry damage – can land at the lower end of the stainless liner range. Wendell will tell you if your job is one of those before the price changes at the door. That is the whole point of upfront pricing.

What Affects Chimney Liner & Rebuild Pricing in Brentwood

• Liner material and appliance type. A gas furnace can use a lighter aluminum liner rated for lower-temperature exhaust; a wood-burning fireplace or wood stove requires a heavier-gauge stainless liner because the flue gases are hotter and more corrosive. In Brentwood, we see a lot of homes that converted from oil to gas but still have the original clay tile liner installed for oil exhaust temperatures – those tiles often crack under the cooler, more acidic condensate from a gas appliance, which is one of the most common reasons liner replacement comes up.
• Flue height and configuration. Longer flues need more liner material and more labor time to install cleanly. Two-story homes in the older neighborhoods off Suffolk Avenue and near Pilgrim State Road regularly have flues in the 30-35 foot range. Offset flues – where the chimney has an angle built in – take extra time and sometimes require a more flexible liner product to navigate properly.
• Existing liner condition and debris removal. If the clay tiles have collapsed – something we see more often than you’d think on Long Island homes built before 1980 – that rubble has to come out before the new liner drops in. It is not technically difficult work, but it takes time, and time is labor cost.
• Masonry condition of the chimney structure. A liner replacement on a chimney with solid, intact brick is a contained job. If the mortar joints are soft or the brick is spalling from years of freeze-thaw cycles – and Brentwood gets enough of those to do real damage – the masonry has to be stabilized before the liner work is finished or you’ll be back in two years doing it over. Tuckpointing or a partial rebuild gets added to the scope.
• Roof access and pitch. Steep roofs cost more to work on. Full stop. If scaffolding or special staging is needed to reach the chimney safely, that goes on the estimate. Most standard homes in Brentwood do not require scaffolding, but the higher colonials on corner lots sometimes do.
• Permit requirements in Suffolk County. Chimney liner replacement in Brentwood falls under Suffolk County and Town of Islip building codes, and permits are sometimes required – particularly for a full rebuild. When a permit is part of the job, there is a permit fee (typically $75 to $250 depending on scope), and the work needs to be inspected before the flue is returned to service. We handle the paperwork; you need to know it exists and that it adds a few days to the timeline.

How to Save on Chimney Liner & Rebuild

The single most effective way to keep liner costs down in Brentwood is to not let a small problem become a large one. A cracked clay tile found during an annual sweep might be a $400 repair. That same crack, after two winters of water infiltrating the masonry, can turn into a partial rebuild conversation. Wendell has been saying this to homeowners since 1999 – it is not a sales pitch, it is just arithmetic.

A few specific moves that genuinely reduce what you spend:

• Get a camera inspection before you agree to anything. Any sweep worth calling will run a video camera down the flue before recommending a liner replacement. If someone tells you the liner needs to go without showing you the footage, that is a reason to call us for a free second opinion. We do this routinely – bring us the written estimate from the other company, and Wendell will look at your chimney and tell you if the diagnosis holds up. No charge.
• Ask about HeatShield resurfacing if the tiles are cracked but the structure is intact. A full liner replacement is not always the right answer. If the existing clay tile is cracked but the chimney body is solid, HeatShield can resurface the flue interior for less than a full stainless liner in some cases. It is a product we know well and use where it genuinely makes sense.
• Bundle the work. If your chimney needs a new liner and you also have a deteriorating crown or a cap that needs replacing, doing it all in one visit costs less than two separate service calls. The crew is already there; the staging is already set up.
• Take advantage of the $40 off coupon. Top Hat Chimney takes $40 off any repair over $200 – liner work qualifies. Seniors and veterans get 10% off, always, on any job. If you are inside Suffolk County, there is no trip charge.
• Schedule in the spring or early summer. Fall is the busy season for chimney work around Brentwood. Scheduling in April or May means faster availability and sometimes more flexibility on timing. It also means the chimney is ready before the first cold week hits in October.

If you want a number before committing to anything, call (934) 935-3847. Estimates are free, and the person who picks up can usually give you a ballpark based on what you describe before anyone drives out. If the job needs a look, we will schedule it and come give you a written number with no obligation attached.

Liner vs. Rebuild: Which One Does Your Brentwood Chimney Actually Need?

This is one of the more common points of confusion, and it is worth clearing up plainly because the two jobs are priced very differently.

A chimney liner is the interior flue passage – the part that channels combustion gases from the firebox or appliance up and out. In most Brentwood homes built before 1990, that liner is made of segmented clay tile. When the tiles crack, shift, or deteriorate, the liner needs to be repaired or replaced. The chimney structure around it – the brick and mortar – may be perfectly fine.

A chimney rebuild refers to the masonry structure itself. If the brick above the roofline is spalling, if mortar joints have opened up to the point where water is getting into the chimney body, or if a significant section of the chimney has shifted or is leaning, that masonry needs to come down and go back up properly. You can have a liner that is in decent shape sitting inside a chimney that needs a rebuild. You can also have the opposite – solid masonry around a completely failed liner.

Most Brentwood homeowners dealing with an older home need one or the other, not both. But on homes that have been deferred for maintenance for ten-plus years, both jobs sometimes overlap. The camera inspection tells the story. The masonry inspection tells the other half of it. We do not quote both until we have seen both.

Why Brentwood Chimneys Have Specific Liner Challenges

Brentwood’s housing stock skews heavily toward construction from the 1950s through the mid-1980s – the postwar expansion that built out central Suffolk County. Those homes were built with clay tile flue liners that were sized and spec’d for oil-fired heating systems. As the region moved toward gas in the 1990s and 2000s, most of those liners stayed in place. That is where the problem starts.

Gas appliances burn cooler than oil, which means the exhaust gases condense inside the flue rather than exhausting fully. That condensate is slightly acidic. Over ten or fifteen years, it degrades clay tile in ways you cannot see from a sweep brush – the glaze goes first, then the surface, then the tile starts to crack. Brentwood is not unique in this regard across Long Island, but the density of that particular housing vintage here means we see it constantly.

Long Island’s climate plays a role too. The freeze-thaw cycle through the winter months puts mechanical stress on masonry. Water that seeps into a hairline crack in the mortar expands when it freezes, widens the crack, lets in more water. A chimney that looks passable in October can look noticeably worse by March. We have seen this pattern on streets near Brentwood Road and in the neighborhoods closer to Pilgrim State for years.

None of this is catastrophic if it is caught and addressed. An annual inspection with a camera is genuinely the cheapest way to stay ahead of it.

What the Installation Process Looks Like

When you call Top Hat Chimney for a liner job in Brentwood, here is how the work typically unfolds:

1. Phone estimate. We ask a few questions – appliance type, chimney height if you know it, any known symptoms like smoke smell or visible cracking – and give you a ballpark range. If the job is straightforward, sometimes that range is narrow enough to be useful on its own.
2. On-site inspection with camera. Wendell or one of his crew runs a video camera down the flue, inspects the crown and cap, checks the flashing and visible masonry. You get to see the footage. You get a plain-English verdict, not a list of codes.
3. Written upfront price. Before a tool comes off the truck for actual work, you have a written number. That number does not change at the door.
4. Liner installation. For a flexible stainless liner, the existing debris (if any) is cleared, the liner is dropped from the top and connected to the appliance at the base, a top plate and rain cap are installed, and the flue is returned to service. A standard job on a single-story Brentwood home takes three to five hours. Two-story homes with longer flues take longer.
5. Post-installation check. We verify the connection at the appliance, check draft, and make sure everything is sealed properly before we leave.
6. 90-Day Done Right Promise. If anything is not right in the 90 days after the job, one call brings us back. In writing, on every job.

For our Chimney Liner & Rebuild services, the timeline is longer – masonry jobs typically take one to three days depending on scope, and if a permit is required, there is lead time for the inspection. We will walk you through all of that before scheduling.

Brands We Use for Liner Work in Brentwood

We are selective about what goes into a chimney because we are the ones who back it with the 90-Day Done Right Promise. For flexible stainless liners, we work with DuraFlex and products from Olympia Chimney – both have strong track records in the temperature ranges typical of Long Island applications. For resurfacing work, HeatShield is our go-to where the existing tile structure supports it. For caps and termination covers, we use Gelco, Famco, and Copperfield products depending on the application.

We do not use whatever was cheapest on the supply truck that week. Wendell puts his name on every job, and he still runs into his customers at the hardware store on Saturday.

FAQs – Chimney Liner & Rebuild Cost in Brentwood

How much does chimney liner replacement cost in Brentwood, NY?

Chimney liner replacement in Brentwood typically costs $1,800 to $3,800 for a standard flexible stainless steel liner, depending on flue length and whether the existing liner debris needs to be removed first. Gas appliance liners run toward the lower end of that range; wood-burning applications run higher because the liner gauge requirements are stricter. HeatShield resurfacing, where applicable, falls in the $2,500 to $5,500 range. Call (934) 935-3847 for a free estimate specific to your home and flue setup.

How much does a chimney rebuild cost in Brentwood, NY?

A partial chimney rebuild above the roofline – the most common scenario in Brentwood’s older housing stock – runs $1,200 to $4,000. A full teardown and rebuild above the roofline runs $4,500 to $9,000, including new brick or block, mortar, crown, and flashing. The right number depends on how much of the existing masonry is sound enough to stay. A proper inspection tells you that before you commit to anything. Call (934) 935-3847 and we will give you a written number after a look.

Do I need both a new liner and a rebuild?

Sometimes, but not usually. Most Brentwood homeowners need one or the other. The liner and the masonry structure are two separate systems – the liner can fail while the brick is solid, and the brick can deteriorate while the liner is still serviceable. A camera inspection of the flue and a visual inspection of the exterior masonry will tell you which problem you actually have. We do not recommend both until we have seen both.

How long does a chimney liner last?

A properly installed stainless steel liner in a Brentwood home will typically last 15 to 25 years with annual inspections. Clay tile liners that came with the house may have been in service for 40 or 50 years – many of the original liners on mid-century homes in Brentwood are well past their useful life. HeatShield resurfacing carries a 20-year warranty when installed correctly. The honest answer is that lifespan depends heavily on appliance type, how often the chimney is used, and whether the chimney cap and crown are intact to keep water out.

Is chimney liner replacement required by code in Brentwood?

In most cases, yes. New York State building code and Suffolk County requirements mandate that an approved liner be in place and in serviceable condition for any connected heating appliance. If you are selling a home in Brentwood and the inspection turns up a failed liner, the buyer’s lender will often require it to be repaired or replaced before closing. Even outside of a real estate transaction, operating a gas or wood-burning appliance with a damaged liner is a carbon monoxide and fire risk – it is not a repair to put off. If you have a written estimate from another company and want a second opinion before deciding, bring it to us and we will look at your chimney for free.

Key Takeaways

• Chimney liner replacement in Brentwood typically costs $1,800 to $5,500, depending on liner type and flue conditions.
• Partial chimney rebuilds run $1,200 to $4,000; full rebuilds above the roofline run $4,500 to $9,000.
• Brentwood’s mid-century housing stock is particularly prone to clay tile liner failure from gas appliance conversion – it is the most common liner call we get in this area.
• You need a camera inspection before agreeing to any liner recommendation. If you did not see the footage, you do not have a real diagnosis.
• Top Hat Chimney offers a free second opinion on any written estimate, $40 off repairs over $200, and 10% off for seniors and veterans.
• Every job comes with the 90-Day Done Right Promise – in writing.
• Wendell Pike has been doing this work in the Brentwood area since 1999. He is reachable at (934) 935-3847 around the clock.

Ready for an Honest Number? Call Top Hat Chimney.

If you have been sitting on a liner inspection report or you have noticed something that does not seem right – smoke smell in the house, staining on the chimney above the roofline, a heating bill that crept up without explanation – a phone call is the right next step. It costs nothing. The estimate is free. And the number you hear on the phone is the number on the invoice.

You can read more about what the actual work looks like on our Chimney Liner & Rebuild in Brentwood service page, or head back to the home page to see everything Top Hat Chimney handles.

Wendell and his crew serve Brentwood and the surrounding Suffolk County communities. No trip charge inside the county. Live person on the phone every hour of the day. Call (934) 935-3847 and let’s figure out what your chimney actually needs.

Written by Wendell Pike, Owner at Top Hat Chimney, serving Brentwood, NY since 1999.

Pricing reflects the Brentwood market as of 2026. Top Hat Chimney offers free estimates – call (934) 935-3847.