Fast, Reliable Chimney Liner & Rebuild Across Kensington
A full chimney liner replacement or rebuild in Kensington, NY typically runs $2,800–$7,500 depending on flue count and access, and most jobs are completed in one to two days. If you’re smelling smoke odors, seeing rust stains on your chimney breast, or your heating contractor flagged a cracked flue, you need a liner inspection before the next heating season. Call (866) 884-9512 for a free estimate—Robert Garcia handles the assessment himself.
We’ve worked on chimney stacks from Ocean Parkway to Cortelyou Road for 17 years, and Kensington’s dense row-house fabric presents challenges no suburban chimney company understands. Tight alley access, shared party-wall flues, and century-old masonry that’s been through coal, oil, and gas conversions—this is the terrain we know. When you’re parking a service vehicle on East 3rd Street or working around the narrow passages behind Avenue C, efficiency matters. We arrive equipped to diagnose and quote same-day, because Kensington homeowners don’t have time for multiple appointments.
Why Apex Chimney Cleaning Greater New York Is Kensington’s Preferred Chimney Liner & Rebuild Company
Our Chimney Liner & Rebuild team has completed liner installations and partial rebuilds on more than 200 Kensington properties over the past decade—work that shows in our 1,096 verified reviews averaging 4.7 stars. Homeowners in the 11218 ZIP specifically mention Robert Garcia’s name in their feedback, noting that the owner who answers the phone is the same person who climbs the ladder and signs off on the finished job.
Response time to Kensington averages same-day or next-day during heating season, with emergency calls for carbon monoxide concerns or visible chimney damage prioritized. We know the neighborhood’s parking regulations, the building stock patterns from Ditmas Avenue to McDonald Avenue, and the specific failure modes that repeat across these 1905-to-1935 brick row houses. That local fluency means faster diagnosis, accurate quotes, and no surprises once we’re on your roof.
Our Chimney Liner & Rebuild Services in Kensington
Stainless Steel Liner Installation
A stainless steel liner is the standard solution for Kensington’s converted heating systems—especially where a high-efficiency gas boiler or water heater now vents into a flue originally sized for coal. We install rigid and flexible DuraFlex and Olympia Chimney stainless liners sized precisely to your appliance’s BTU output and venting requirements. In Kensington’s attached homes, proper liner sizing isn’t just about draft efficiency; it’s about preventing condensation that accelerates corrosion in a shared stack where your neighbor’s flue may already be compromised.
Flexible Liner for Tight Access Flues
Some of Kensington’s older chimneys have offset flues, narrow cleanout doors, or structural constraints that make rigid stainless impossible to feed. Flexible liners—installed with proper insulation blankets per NFPA 211—solve this without dismantling walls or disturbing historic plaster. We’ve run flexible liners through chimneys on Ocean Parkway where the original 1920s construction left almost no straight vertical path, getting modern venting safety into spaces that would otherwise require full reconstruction.
Liner Replacement for Failed Terra-Cotta
The original terra-cotta tile liners in Kensington’s housing stock were never designed for the acidic condensate produced by today’s efficient gas appliances. Cracked, shifted, or missing tiles are the norm in 11218, not the exception. Our liner replacement process includes full video inspection, debris removal, and proper appliance connection—critical in two-family homes where a landlord may not realize the upper unit’s boiler shares the same stack. A proper replacement eliminates the carbon monoxide pathway that cracked clay creates.
Partial Rebuild — Crown, Flaunching & Upper Courses
Kensington’s exposure to Atlantic moisture and Brooklyn’s brutal freeze-thaw cycle destroy chimney crowns faster than almost any other neighborhood we serve. Spalling brick, deteriorated mortar joints, and cracked flaunching are structural emergencies waiting to happen. Our partial rebuilds address the upper 4–6 courses, crown replacement, and proper waterproofing—restoring structural integrity without the cost of full demolition. On East 5th Street, we relined a shared multi-flue stack for a two-family home where the upper unit’s gas boiler was venting into an unlined clay flue hidden behind the landlord’s primary heating flue. We installed a HeatShield stainless steel liner in the secondary flue and rebuilt the crown to stop moisture entry, addressing decades of neglect without disrupting either tenant’s schedule.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
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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 Kensington
We stock and install professional-grade materials from Gelco, Olympia Chimney, and Famco—brands specified by commercial contractors because they survive real-world conditions. For Kensington’s harsh coastal exposure and shared-stack configurations, we don’t gamble on generic hardware-store liner kits. Having the right diameter, insulation, and termination components on the truck means we complete most liner installations in a single day, even when your chimney access is through a narrow alley off Cortelyou Road. Robert Garcia selects materials based on what the specific flue configuration demands, not what’s cheapest to stock.
Common Chimney Liner & Rebuild Problems We See in Kensington Homes
- Unlined or cracked terra-cotta from coal-era conversions. The flue that safely vented a 1950s oil burner often cannot handle a modern 95% efficiency gas boiler. Condensation pools in the cracks, eroding mortar and creating a carbon monoxide pathway into living spaces—or into your neighbor’s unit through a shared party wall.
- Hidden secondary flues in subdivided row houses. A large share of Kensington’s two-family homes were subdivided decades ago, and the upper-unit tenant often has a gas boiler or water heater vented into a flue the landlord doesn’t know exists. Technicians regularly discover uncleaned, unmaintained secondary flues hidden inside the same chimney stack as the primary heating flue—a building-configuration quirk common in Brooklyn’s converted row-house stock.
- Freeze-thaw spalling at crowns and mortar joints. Brooklyn’s freeze-thaw cycle drives aggressive deterioration in Kensington’s century-old brick chimneys, accelerated by Atlantic moisture. Routine cleaning appointments frequently uncover structural crown or flaunching failures that need masonry repair before the next heating season.
- Improperly sized liners from previous “repairs.” We’ve found flexible liners jammed into flues without insulation, rigid liners disconnected at the appliance collar, and DIY installations that created more hazard than they solved. Kensington’s housing density means a failed liner doesn’t just affect your home—it pressurizes the shared stack and can back-draft adjacent units.
Pricing for Chimney Liner & Rebuild in Kensington, NY
Here’s what chimney liner and rebuild work actually costs in the 11218 market:
| Service | Typical Range in Kensington |
|---|---|
| Single-flue stainless steel liner (standard access) | $2,800 – $4,200 |
| Multi-flue stainless steel liner (two-family/shared stack) | $4,500 – $6,800 |
| Flexible liner with insulation (tight-offset flue) | $3,200 – $5,000 |
| Partial rebuild (crown, upper courses, flaunching) | $2,200 – $4,500 |
| Full chimney rebuild (severe structural failure) | $8,500 – $15,000+ |
Costs run toward the higher end when we’re working around Kensington’s tight alley access, coordinating with multiple tenants in a subdivided building, or addressing hidden secondary flues that weren’t visible in the initial scope. We provide fixed quotes after video inspection—no open-ended billing. Call (866) 884-9512 for your free estimate; Robert Garcia will assess your specific flue configuration and explain exactly what the job requires.
We Also Serve Cities Near Kensington
Our service radius covers the full Brooklyn chimney market, including Flatbush, Borough Park, Brooklyn broadly, and Park Slope. Each neighborhood has distinct building stock and failure patterns—Flatbush’s Victorian freestanding homes differ materially from Kensington’s attached rows—and we adjust our approach accordingly. If you’re on the border of Kensington and Park Slope or managing properties across multiple ZIP codes, we coordinate scheduling to minimize disruption.
Serving Kensington, NY — Our Local Coverage Area
We’re based in the Kensington 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 Kensington
You can’t safely keep using an old clay flue liner because terra-cotta tile was engineered for the high-temperature, low-moisture exhaust of coal and oil combustion—not the cool, acidic condensate from modern gas appliances. In Kensington’s attached housing, a cracked clay liner doesn’t just leak into your own home; it can pressurize the shared party-wall stack and back-draft carbon monoxide into your neighbor’s unit through deteriorated mortar joints. Call (866) 884-9512 and Robert Garcia will video-inspect your flue to document the exact condition.
We use compact equipment, flexible liner systems when rigid pipe won’t fit, and schedule around your building’s access constraints—many Kensington alleys won’t accommodate a full-size masonry truck. Robert Garcia has navigated alley entries off East 4th Street and Avenue C where standard boom lifts simply don’t fit; we bring scaffold components and liner sections that can be hand-carried if necessary. The key is pre-planning: we scout access during the estimate so the installation day proceeds without surprises.
In Kensington’s converted row-house stock, the chance is significant enough that we routinely find secondary flues during what the homeowner assumed was a straightforward primary-flue service call. Subdivisions done in the 1970s and 1980s often routed upper-unit appliances into existing chimney passages without updating the landlord’s records or installing proper liners. Our video inspection scans the full chimney interior, not just the flue you think is active—because finding an unlined, uncleaned secondary flue venting into your stack is a liability you need to address before the next heating season.
Yes, a partial rebuild can absolutely address crown and upper-course damage if the structural brick below the roofline remains sound—which is true for most Kensington chimneys where the failure is freeze-thaw spalling at the exposed top. We remove the damaged upper 4–6 courses, pour a new reinforced concrete crown with proper drip edges and slope, and repoint mortar joints to match existing composition. This preserves your chimney’s structural core while eliminating the water infiltration that would otherwise progress to full rebuild territory. Call (866) 884-9512 for a free assessment of whether your damage qualifies for partial reconstruction.
We prevent cross-unit carbon monoxide migration by ensuring every flue in a shared stack is independently lined, properly sized, and sealed at all connection points—eliminating the gaps and pressure imbalances that drive back-drafting between units. In Kensington’s party-wall chimneys, we also inspect the wythe (the dividing masonry between flues) for deterioration that could create a gas pathway even with intact liners. This is specialized work that requires understanding how your specific building’s chimney was constructed and modified over decades; Robert Garcia evaluates each shared stack as a system, not a collection of individual flues.
Written by Robert Garcia, Owner at Apex Chimney Cleaning Greater New York, serving Kensington and Brooklyn since 2008.