Fast, Reliable Chimney Liner & Rebuild Across Flatbush
Chimney liner and rebuild work in Flatbush typically runs $2,800-$7,500 depending on whether you need a single flue relined or a full stack rebuilt, and most jobs are completed in one day with our crew working out of Brooklyn. If you live in a pre-WWII rowhouse or two-family near Flatbush Avenue, Nostrand Avenue, or Cortelyou Road, your chimney was almost certainly built for coal and later converted to oil heat without proper re-engineering. That history matters. We’ve been driving to 11226 for over 42 years, and we know the difference between a flue that needs cleaning and one that needs rebuilding before we even set up the ladder. Call (855) 950-3861 any hour, day or night. A live person answers.
Why Hearthstone Chimney Co. of New York City Is Flatbush’s Preferred Chimney Liner & Rebuild Company
Flatbush homeowners don’t have patience for contractors who vanish or send a different face every visit. We’ve built our name here on showing up when we say, documenting what we find, and standing behind the repair. Our Chimney Liner & Rebuild team carries level-2 camera equipment on every truck, so you see the cracks, the sulfur etching, the water damage yourself. No hand-waving.
Our technicians are background-checked, uniformed, and trained to work on the specific chimney configurations common to Flatbush’s 1910s-1940s housing stock. Most jobs finish in a single visit. We price upfront, and the number on the estimate is the number on the invoice.
The 90-Day Done Right Promise applies to every liner and rebuild job in 11226. In writing. If it’s not right, we come back. No paperwork to dig up, no argument.
Phones are answered by a live person 24 hours a day, 7 days a week. Not a callback queue. Not an app.
Our Chimney Liner & Rebuild Services in Flatbush
Stainless Steel Liner Installation
Most oil boiler chimneys in Flatbush need a stainless steel liner. The original terra cotta flue was sized for coal, not for the cooler, wetter exhaust of an oil burner. Without a liner, sulfur condensate etches the clay and mortar joints, and eventually the exhaust finds its way into wall cavities or neighboring units. A DuraFlex stainless steel liner, properly sized to the boiler’s BTU output and installed with insulation where code requires, gives you a sealed, acid-resistant flue that will outlast the boiler itself. Typical cost in Flatbush: $2,800-$4,200 for a standard oil-boiler flue, including the level-2 inspection and written verdict.
Flexible Liner Solutions
Not every Flatbush chimney is straight. In the walk-up apartment buildings along Ocean Avenue and the deeper rowhouse blocks off Newkirk Avenue, offsets and chimney breasts create bends that rigid pipe cannot navigate. Flexible liners from DuraFlex conform to these irregular flues while maintaining the same corrosion resistance. We pull them through from the top, seal the connection at the boiler, and pressure-test before we leave. Done right, and we stand behind it.
Liner Replacement
Sometimes a liner was installed decades ago by a previous owner, and it’s failing. Aluminum liners, in particular, do not survive oil exhaust. We remove the old material, chemically clean the flue to bare masonry, and install a new stainless system sized correctly for whatever appliance is venting. On a recent job on Nostrand Avenue, we opened a 1930s terra cotta flue serving an oil boiler and found the inner wall etched paper-thin by decades of sulfur-laden condensate. We installed a DuraFlex stainless steel liner sized to the boiler’s output, then rebuilt the deteriorated crown and top five courses of brick to stop water infiltration. The homeowner had a written warranty and photos of every stage.
Partial and Full Chimney Rebuild
When the crown has failed, the mortar joints are washed out, and water has been entering the stack for years, a liner alone won’t solve the problem. We rebuild. A partial rebuild addresses the top courses, the crown, and the flue surround, typically $4,500-$6,000 in Flatbush. A full rebuild, necessary when the breast is separating from the building or multiple flues have collapsed, runs $6,500-$7,500 and up. We match existing brick where possible, pour a proper concrete crown with drip edge, and install a Gelco or Copperfield cap to protect the investment. Every rebuild carries the 90-Day Done Right Promise and the K.E.Y.S. code: Krafted right, Every time, Your home first, Standing behind it.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Flatbush
We don’t use builder-grade substitutes. Our trucks carry DuraFlex stainless and flexible liner systems, HeatShield cerfractory resurfacing materials for flue walls that need structural repair without full relining, and Gelco and Copperfield caps and dampers sized for the older chimney openings common in Flatbush. Because we stock these parts locally, most Flatbush jobs don’t wait on shipping. You get the right component, installed correctly, with documentation you can keep for your records or your insurance.
Common Chimney Liner & Rebuild Problems We See in Flatbush Homes
- Crown and mortar deterioration from freeze-thaw cycling. Brooklyn’s coastal moisture and hard winter temperature swings attack the soft common brick of pre-WWII Flatbush chimneys. Water enters through cracked crowns, freezes, expands, and opens the mortar joints. By the time you notice a leak, the flue liner is often compromised.
- Undocumented flue configurations in shared chimney breasts. On Flatbush’s tightly packed rowhouse blocks, a single chimney breast shared between two semi-detached homes can contain four or more flues serving appliances in separate units. Because many conversions were done over decades without permits, technicians regularly discover that a landlord’s gas water heater is actually venting into a neighboring unit’s capped coal flue, or that an “unused” fireplace flue has been conscripted to serve a modern appliance with no liner.
- Oil combustion deposits hardening into acidic crust. The sulfur in No. 2 heating oil combines with moisture in the flue to form sulfuric acid condensate. Over years, this hardens into a glassy, nearly impenetrable layer that standard brushing won’t touch. If a new liner is installed over this crust, the acid continues to eat the masonry behind it. Chemical cleaning is mandatory, not optional, before relining an oil flue in Flatbush.
- Chronically undersized flues from unpermitted fuel conversions. When a coal furnace was swapped for an oil boiler or gas unit, the flue was often left unchanged. An undersized flue runs too cool, worsening condensation and creosote or sulfur buildup. An oversized flue for a modern appliance can’t establish proper draft. Either condition is a code violation and a carbon monoxide risk.
Pricing for Chimney Liner & Rebuild in Flatbush, NY
| Service | Typical Range in Flatbush | What Affects Cost |
|---|---|---|
| Level-2 camera inspection with written report | $249-$349 | Roof access, number of flues, documentation needed |
| Stainless steel liner (oil boiler flue) | $2,800-$4,200 | Flue length, diameter, bends/offsets, insulation requirements |
| Flexible liner with offset navigation | $3,200-$4,800 | Degree of offset, access constraints, appliance type |
| Chemical cleaning of oil flue before relining | $450-$750 | Thickness of deposit, flue condition, disposal requirements |
| Partial rebuild (crown, top courses, flue surround) | $4,500-$6,000 | Brick matching, scaffold needs, extent of water damage |
| Full chimney rebuild | $6,500-$7,500+ | Height, brick type, flue count, structural integration with building |
These are the numbers we give Flatbush homeowners before work begins. No surprises on the bill. Every estimate is itemized, and we explain which items are urgent, which can wait, and why. Seniors and veterans receive a permanent 5% discount. Repairs over $250 qualify for $50 off. Call (855) 950-3861 for a free estimate at your Flatbush home.
We Also Serve Cities Near Flatbush
Our crews work across Brooklyn daily. If you’re in Flatbush proper, Kensington, East Flatbush, or Park Slope, we’re already nearby. Same live-answer phone, same 90-Day Done Right Promise, same documentation standards. We know the chimney stock in each neighborhood differs, and we adjust our inspection approach accordingly.
Serving Flatbush, NY - Our Local Coverage Area
We’re based in the Flatbush area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Chimney Liner & Rebuild in Flatbush
Not always, but in most pre-WWII Flatbush homes, yes. The original terra cotta flue was designed for coal exhaust, which is hotter and drier than oil exhaust. Oil combustion produces sulfur-laden condensate that eats terra cotta and mortar. If your flue is unlined or the existing liner is damaged, stainless steel is the only material that will survive long-term. We determine this with a level-2 camera inspection, not a guess. Call (855) 950-3861 to schedule yours, estimates are free.
You don’t, not without a camera inspection. In Flatbush’s semi-detached two-families, undocumented flue sharing is common, and it can be dangerous. Our level-2 inspection maps every flue, identifies what appliance connects to what, and flags code violations like a gas water heater venting into a dead coal flue. You’ll get photos and a plain-English verdict. If there’s a problem, we’ll show you exactly where and explain the fix. Call (855) 950-3861, we’re familiar with these configurations.
Sometimes, if the crack is hairline and the crown is otherwise sound. More often in Flatbush, the crown has been deteriorating for years, water has entered the stack, and the top courses of brick are spalling. A patch on a failed crown is money thrown away. We document the full condition with photos, then recommend either a proper crown rebuild with pour and drip edge, or a partial rebuild if the damage extends below the roofline. The estimate is free, and the number we give is the number you pay.
No, not without inspection and likely modification. Old fireplace flues in Flatbush rowhouses are oversized for modern gas appliances, which can cause draft failure and carbon monoxide spillage. They’re also often unlined, damaged, or already serving another appliance without your knowledge. We inspect with a camera, size the flue to the appliance, and install a proper liner if the flue is usable at all. Never assume an “unused” flue is safe. Call (855) 950-3861 for a documented assessment.
Because sulfur deposits harden into an acidic, glassy crust that wire brushing alone cannot remove. In Flatbush’s dense blocks of converted oil-heat homes, this buildup is universal. If we install a new liner over it, the acid continues to attack the masonry behind the liner, and the liner itself can fail prematurely. Chemical cleaning dissolves and removes this layer down to sound masonry, giving the new liner a proper substrate and giving you the full lifespan of your investment. We include this step in our Flatbush relining proposals when it’s needed, no exceptions.
Ready to get your Flatbush chimney inspected, relined, or rebuilt? Call Hearthstone Chimney Co. at (855) 950-3861. A live person will answer, 24 hours a day, and we’ll schedule your free estimate at a time that works for you. Most jobs are completed in a single visit. The 90-Day Done Right Promise covers every liner and rebuild we do in 11226, in writing, with no arguing.
Written by Frank Calucci, Owner at Hearthstone Chimney Co., serving Flatbush and Brooklyn since 1984.