Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Before
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AfterFast, Reliable Chimney Repair Across Lexington
Chimney repair in Lexington typically runs $650-$3,800 depending on scope, with mortar repointing on colonial chimneys starting around $850 and full rebuilds reaching the upper end for pre-Revolutionary stacks. Most Lexington jobs are completed in a single visit, and our Boston office dispatches crews to the Battle Green area, Massachusetts Avenue corridor, and the 1950s ranch neighborhoods off Woburn Street with same-week scheduling during peak season. If your chimney is shedding mortar, taking water, or drafting poorly, call (781) 404-3793 - a live person answers, and we’ll get a technician out to look at it.
We’ve been working on Lexington chimneys for decades. The town’s housing stock is unlike anywhere else in the Boston metro: genuine 1700s colonials with rubble-stone bases and hand-laid flues sit a quarter mile from mid-century ranches with clay tile liners that are cracking after sixty years of use. That split personality means a repair approach that works on Clarke Street will fail on a 1970s split-level off Bedford Street. Our Chimney Repair team knows the difference because we’ve measured, photographed, and repaired both.
Why Hearthstone Chimney Co. Is Lexington’s Preferred Chimney Repair Company
Lexington homeowners call us back. They remember the technician’s name, ask for him by name the next season. That’s not marketing; it’s what happens when you show a homeowner photos of their own flue, explain what you’re seeing in plain English, and give them a written estimate with a number that matches the final invoice.
Our 90-Day Done Right Promise is backed in writing with no arguing - if it’s not right, we come back. No paperwork to dig up, no manager to escalate. The K.E.Y.S. code governs every job: Krafted right, Every time, Your home first, Standing behind it. Russell Haines built this company on that standard starting in 1984, and it’s still how we operate.
Calls are answered by a live person 24 hours a day, 7 days a week. Not a callback queue, not an app. Our technicians are background-checked, uniformed, and carry professional-grade materials from DuraFlex, HeatShield, and Famco on every truck. Most Lexington repairs are completed in a single visit because we stock what we need and measure before we arrive.
We know Lexington’s specific conditions: the freeze-thaw cycles that cross 32°F repeatedly through January and February, spalling lime mortar on colonial chimneys far faster than modern Portland-cement construction. The dense oak and maple canopy that dumps leaves into flues each October, choking draft and accelerating creosote buildup. The Historic Districts Commission review process for properties near the Battle Green. This is local knowledge you can’t fake.
Our Chimney Repair Services in Lexington
Mortar Repointing
Lexington’s colonial chimneys were built with lime mortar, a softer, more porous mix than modern Portland cement. It’s the right material for 250-year-old brick - it flexes, it breathes, it lets moisture escape. But Lexington’s repeated freeze-thaw cycles grind that lime mortar out of the joints faster than in newer construction. We’ve repointed chimneys on Percy Road and along Massachusetts Avenue where the mortar was powdering out after just eight years, not because of poor original work, but because the climate is hard on old masonry.
The wrong repair is worse than no repair. We’ve seen chimneys near the Battle Green where a previous contractor repointed with hard Portland-cement mortar. It looked clean and sharp for two seasons. Then the trapped moisture froze, expanded, and spalled the faces off the original brick. Fixing that costs triple what proper lime-matched repointing would have. We grind out the old joint to proper depth, match the lime content to the original, and tool the finish to blend with the period construction. In the Historic Districts Commission’s purview, we document our materials and methods before work begins so preservation review moves smoothly.
A typical mortar repointing job on a Lexington colonial chimney runs $850-$2,400, depending on accessible surface area and scaffold needs.
Spalling Brick Repair
Spalling - the flaking and crumbling of brick faces - is what happens when water gets in and freeze-thaw cycles push it back out. Lexington’s mature tree canopy keeps chimneys shaded and damp longer into the morning, and the lime mortar joints absorb more moisture than modern cement. Combine that with the town’s aggressive temperature swings, and you’ve got a recipe for brick faces popping off by spring.
We assess spalling with a Level-2 camera inspection, photographing the damage where you can see it. Minor spalling on a chimney cap or crown course can sometimes be addressed with targeted brick replacement and proper waterproofing. Extensive spalling through the smoke chamber or above the roofline may indicate a systemic moisture problem requiring crown rebuilding and chimney waterproofing together. We don’t guess; we show you the photos, explain the cause, and let you decide the scope.
Spalling brick repair in Lexington typically ranges from $1,200 for localized replacement to $3,200 for extensive rebuilding with matching reclaimed brick.
Chimney Waterproofing
Lexington’s combination of old masonry, dense tree cover, and freeze-thaw cycling makes chimney waterproofing one of the most cost-effective preventive repairs we offer. We apply vapor-permeable sealers - never the film-forming products that trap moisture inside - using professional-grade formulations from HeatShield and Famco. The chimney needs to breathe; our job is to keep liquid water out while letting water vapor escape.
We pay special attention to the crown, the flue joint, and the mortar bond line where the chimney meets the roof. On colonial chimneys, we verify that the original lime mortar curing is complete before sealing, or we trap alkalis that will attack the brick. Most waterproofing jobs are completed in a single visit and carry our 90-Day Done Right Promise.
Chimney waterproofing in Lexington runs $450-$950 for standard applications, with complex scaffold access or crown rebuilding additional.
Flashing Repair
The intersection where chimney meets roof is the most common leak point we find in Lexington’s ranch and split-level homes from the 1950s-1970s. Original flashing on these houses was often step-flashing with a counterflap, and sixty years of thermal cycling has opened gaps, corroded fasteners, or separated the seal. We repair with copper or stainless step flashing, integrated under the shingles and sealed with high-temperature compounds. No caulk-only fixes; those fail in two seasons.
Flashing repair in Lexington typically costs $380-$780, with full replacement on larger chimneys reaching $1,100-$1,600.
What happens when you call
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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 Lexington
We don’t substitute builder-grade materials to hit a price point. Every truck carries professional-grade products from DuraFlex, HeatShield, and Famco - brands that publish test data and stand behind their specifications. For Lexington’s colonial chimneys with irregular flue geometry, we physically measure before ordering DuraFlex liner components; no guessing from a standard chart. HeatShield’s cerfractory resurfacing products let us restore smoke chamber integrity on historic flues without altering exterior dimensions. Famco caps and dampers fit the odd-size flue openings we find on 1700s construction. Because we stock these parts and coordinate from our Boston office, most Lexington repairs don’t wait on shipping.
Common Chimney Repair Problems We See in Lexington Homes
- Lime mortar erosion on pre-Revolutionary chimneys. Lexington’s freeze-thaw winters cross 32°F repeatedly, grinding out the soft lime joints on colonial chimneys far faster than modern Portland-cement stacks. Repointing schedules here are driven by mortar erosion, not by how often the fireplace is used.
- Shared flue passages in stacked-hearth colonials. Sweeps working the streets immediately off the Battle Green - Percy Road, Clarke Street, the older stretches of Massachusetts Avenue - frequently find chimneys that serve multiple original hearth openings on stacked floors. A colonial construction pattern that creates shared flue passages requiring careful mapping before any work to avoid cross-contamination between fireplaces.
- Heavy leaf and debris loads from mature canopy. Lexington’s dense oaks and maples drop material into flues each fall that can restrict draft and accelerate creosote buildup through the heating season. We clear this debris during inspection and recommend cap installation where missing.
- Cracked clay flue tiles in 1950s-1970s construction. The large band of ranch and split-level homes in Lexington now has aging liners that have cycled through forty to seventy heating seasons. Cracked tiles can allow combustion gases into wall cavities; we document this with camera inspection and recommend relining when found.
Pricing for Chimney Repair in Lexington, MA
Here is what chimney repair costs in Lexington’s market as of 2025:
| Service | Typical Range |
|---|---|
| Mortar repointing (colonial lime-matched) | $850 - $2,400 |
| Spalling brick repair (localized) | $1,200 - $3,200 |
| Chimney waterproofing | $450 - $950 |
| Flashing repair | $380 - $780 |
| Flashing full replacement | $1,100 - $1,600 |
| Chimney rebuilding (partial) | $2,800 - $5,500 |
| Chimney rebuilding (full, historic) | $4,500 - $8,200 |
What moves the number: scaffold requirements on multi-story colonials, matching reclaimed brick for historic properties, access for equipment on tight lots near the town center, and whether preservation review documentation is needed. We provide upfront pricing before any work begins - the estimate number is the invoice number. Call (781) 404-3793 for a free, written estimate with photos from our Level-2 inspection.
We Also Serve Cities Near Lexington
Our crews work throughout the Route 128 corridor. If you’re in Woburn, Bedford, Winchester, or Burlington, the same technicians, same materials, and same 90-Day Done Right Promise apply. We coordinate scheduling from our Boston office but live in these communities and know the local housing stock. Chimney Repair in Lexington is our home territory, and we treat the surrounding towns with the same care.
Serving Lexington, MA - Our Local Coverage Area
We’re based in the Lexington 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 Repair in Lexington
A wood-burning chimney in Lexington should be inspected annually and swept when creosote buildup reaches 1/8 inch, which for daily winter use typically means once per heating season. The town’s mature oak and maple canopy dumps heavy leaf debris into uncapped flues each fall, restricting draft and causing first-degree creosote to glaze into harder third-degree deposits faster than in cleared areas. Burning seasoned hardwood below 20% moisture and maintaining strong draft with a proper cap extends the safe interval. Call (781) 404-3793 to schedule - estimates are free.
An unlined colonial chimney can often remain in service if the masonry is sound, the flue is properly sized for the appliance, and a Level-2 inspection shows no gaps, cracks, or combustion gas leakage into living spaces. Clarke Street chimneys frequently have irregular hand-laid flue geometry that doesn’t conform to modern liner sizing charts; we physically measure before making any recommendation. If the chimney serves a modern insert or stove, NFPA 211 typically requires a liner sized to the appliance. We show you the camera photos, explain what the code requires versus what’s prudent, and let you decide. Call (781) 404-3793 for an exact assessment - estimates are free.
Yes, if your property falls within the Lexington Historic Districts Commission’s purview, any work that alters the exterior appearance - including cap replacement, liner work with visible termination changes, or mortar repointing that affects the facade - must clear preservation review before work begins. We document our materials, methods, and color matches as part of our standard proposal to streamline this process. For properties on Percy Road, Clarke Street, and the historic stretches of Massachusetts Avenue, we build this timeline into our scheduling. Call (781) 404-3793 and we’ll confirm whether your address requires review - estimates are free.
Third-degree creosote appears as shiny, black, tar-like glaze or puffy, honeycombed deposits that are difficult to remove with standard brushing and require rotary mechanical removal. Warning signs include reduced draft, smoke spillage when opening the firebox, a strong acrid odor even when not in use, and visible shiny black deposits on the damper or smoke chamber walls visible during a flashlight inspection. Lexington’s heavy fall leaf loads and the tendency to burn slower, smoldering fires in mild late-season weather accelerate glaze formation. This is a genuine fire hazard; if you suspect it, stop using the fireplace and call (781) 404-3793 for a Level-2 inspection - estimates are free.
Lime mortar crumbles in spring because it absorbed moisture through winter, then the freeze-thaw cycles of Lexington’s climate - temperatures repeatedly crossing 32°F - expanded that water in the joints and broke the bond. Lime mortar is intentionally softer and more porous than modern cement; it sacrifices itself to protect the brick. The problem isn’t the mortar’s quality but the accelerated weathering from Lexington’s specific climate pattern on 250-year-old masonry. Repointing with lime-matched mix on the proper schedule prevents brick spalling. Repointing with hard Portland cement traps moisture and destroys the brick. We can tell you which was used last time with a quick visual inspection. Call (781) 404-3793 - estimates are free.
Last November we were on Percy Road off the Battle Green at a 1760s colonial whose stacked-hearth flue served fireplaces on two floors. Our tech mapped the shared passage before cleaning, found heavy first-degree creosote in the upper smoke chamber and a spalled crown shedding lime mortar into the flue, then repointed the joints and sealed the crown without altering the chimney’s exterior profile. The draft came back strong enough that the homeowner retired their backup electric heater for the rest of the season. That’s the kind of repair we stand behind.
Written by Russell Haines, Owner at Hearthstone Chimney Co., serving Lexington and local communities since 1984.