Chimney Repair in Lexington - You See the Footage Before You Get a Price

Fast, Reliable Chimney Repair Across Lexington

Chimney repair in Lexington typically runs $350-$2,800 depending on scope, and most jobs are completed in a single visit with upfront pricing agreed before work begins. Our crews serve Lexington directly from our Boston office, and we understand the specific challenges of this town’s split housing stock - from 18th-century colonials near the Battle Green with pre-liner brick flues to mid-century ranches with oversized oil-era chimneys.

Call (857) 392-4709

We’ve been answering calls with a live person, 24 hours a day, for over 42 years. When you reach us at (857) 392-4709, you’ll speak to someone who can schedule a Level-2 camera inspection and give you a plain-English verdict with photos you can see for yourself. No voicemail. No callback queue.

Lexington’s inland location in Middlesex County means harder freeze-thaw cycling than coastal towns - lime mortar crumbles faster, crowns crack sooner, and moisture finds its way through spalling brick that a harbor town’s moderated climate might spare another season. That’s not theory. It’s what our Chimney Repair team documents on camera every winter.

Why Hearthstone Chimney Co. Is Lexington’s Preferred Chimney Repair Company

We’re not a price-cutting chain or a one-truck operator who might answer the phone next year. Hearthstone Chimney Co. has served local communities for over 42 years, and we plan to be here in thirty more. That changes how we work on your chimney.

Our technicians are background-checked, uniformed, and trained to complete most repairs in a single visit. Every job carries our 90-Day Done Right Promise - in writing, no arguing. If it’s not right, we come back. Russell Haines built this company on the K.E.Y.S. code: Krafted right, Every time, Your home first, Standing behind it.

Lexington homeowners call us because we document what we find. Our Level-2 inspections end with dated photos and a written verdict you can understand without a engineering degree. When a chimney near Hancock Street or along Waltham Street needs work, you’ll know exactly what failed, why it failed, and what it costs to fix before we touch a trowel.

Our Chimney Repair in Lexington crews know the local terrain - from the narrow drives off Marrett Road to the historic-district properties where exterior alterations visible from public ways require Historic Districts Commission review. We factor that into our repair plans so you’re not surprised by a permitting holdup.

Our Chimney Repair Services in Lexington

Mortar Repointing

Lexington’s pre-1820 chimneys near the Battle Green were built with lime mortar, not the portland cement most crews grab by default. Portland is harder than the original brick. It traps moisture. In a hard freeze-thaw winter like Lexington’s, that trapped water expands and spalls the face right off your historic brick.

We repoint with lime-matched mixes that breathe the way the original masons intended. A typical mortar repointing job on a Lexington colonial runs $850-$1,600 for the upper chimney above the roofline, including scaffold setup and debris removal. For a full chimney from the shoulder up on a multi-flue stack, expect $1,800-$2,800.

Spalling Brick Repair

Spalling - the flaking and crumbling of brick faces - accelerates in Lexington’s climate because freeze-thaw cycles hit harder inland. Once the protective fire-skin cracks off, the soft inner brick absorbs water like a sponge. We’ve replaced individual courses on chimneys along Massachusetts Avenue where the damage had progressed to structural compromise.

Single-brick replacement with matching salvage or new-old-stock runs $180-$320 per brick including mortar matching. For larger sections requiring partial rebuild, $650-$1,400 depending on access height and whether we need to source period-appropriate brick. We photograph everything before we cut.

Chimney Waterproofing

Lexington’s above-average interior snowfall means more meltwater sitting on crowns and soaking into porous brick. Our waterproofing treatment uses vapor-permeable sealers - not the film-forming products that trap moisture inside. We apply with pump sprayers after repairing any open joints, so water exits as vapor but can’t enter as liquid.

Waterproofing a standard single-flue chimney in Lexington runs $450-$750, including minor crown sealing. For larger multi-flue stacks or chimneys requiring extensive prep work, $850-$1,200. The treatment carries a 10-year manufacturer’s warranty when applied to sound masonry.

Flashing Repair

The step flashing where your chimney penetrates the roof is a common leak point on Lexington’s older homes, especially where multiple roofing layers have buried original counter-flashing. We remove shingles as needed, install new copper or galvanized step flashing, and seal with high-temperature polyurethane. Most flashing repairs run $350-$650 for standard chimney widths.

Trusted Brands We Service in Lexington

We don’t use builder-grade substitutes. For liner installations and restorations in Lexington, we work with HeatShield for cerfractory flue resurfacing and DuraFlex for stainless steel relining - both specified to handle the acidic condensate from modern gas appliances and the thermal shock of wood-burning systems. For caps, dampers, and waterproofing materials, we stock Gelco and Copperfield components at our Boston office, which means faster turnaround for Lexington homeowners and no waiting on drop-shipped parts.

Common Chimney Repair Problems We See in Lexington Homes

• Lime-mortar joint failure in pre-1820 flues. The freeze-thaw cycling in Middlesex County crumbles soft lime mortar faster than portland repairs can accommodate. We see repeated spalling and open joints within two to three seasons when the wrong mortar was used. Our lime-matched repointing prevents this cycle.
• Abandoned oil flues left open after conversion. Lexington’s 1950s-1970s ranches and split-levels frequently have oversized oil flues still open at the top after oil-to-gas conversions. Squirrels nest. Rain enters. And the open flue creates cross-drafts that pull smoke from adjacent fireplace flues back into living spaces.
• Crown cracking from interior snowfall load. Lexington accumulates more snow than coastal towns, and that snow sits on concrete crowns through multiple freeze-thaw cycles. Hairline cracks become structural failures. We install reinforced crowns with proper drip edges and slope.
• Oversized flues causing poor draft in wood stoves. The oil-era chimneys on Lexington’s mid-century housing stock were sized for furnace draft, not wood-burning appliances. Flue gases cool too quickly, creosote builds faster, and the stove never draws properly. HeatShield liner systems or stainless inserts correct the flue diameter.

Pricing for Chimney Repair in Lexington, MA

We Also Serve Cities Near Lexington

Our crews regularly work in Winchester, Belmont, Medford, and Stoneham - the same Middlesex County freeze-thaw conditions, many of the same housing-era patterns, though none with Lexington’s concentration of pre-liner colonial chimneys or its Historic Districts Commission review process. If you’re in one of these neighboring towns and found this page, the same standards apply: photos you can see, a plain-English verdict, and our 90-Day Done Right Promise in writing.

FAQs - Chimney Repair in Lexington