Masonry repair
Sweep & inspection
Caps & crowns
Flue relining
Gas fireplace serviceLevel 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.
Fast, Reliable Gas Fireplace Repair Across San Antonio
Gas fireplace repair in San Antonio typically costs $180 – $420 for common fixes like thermocouple replacement, gas valve adjustment, or pilot assembly repair, and $600 – $1,400 for liner work or venting corrections in older masonry chimneys. Most repairs are completed the same day we diagnose the problem, and every job starts with a camera inspection you can watch. If you live in San Antonio and your gas fireplace is acting up, you want someone who knows the difference between a 1920s clay tile flue in King William and a 1990s prefab metal vent in Stone Oak. Call (903) 515-5079 for a free estimate.
Why Alcott Chimney San Antonio Is San Antonio’s Preferred Gas Fireplace Repair Company
We’ve spent a long time inside San Antonio’s chimneys, and the city’s older homes tell you exactly what’s gone wrong before you even unload the tools. Our Gas Fireplace Repair team works on fireplaces in King William Victorians, Monte Vista foursquares, Alamo Heights bungalows, and the post-war tract homes that stretch out toward Converse and Schertz. The problems repeat: cracked clay liners, rusted fireboxes, gas logs venting into stacks that were built for wood smoke a century ago.
Ruben Castellano leads our San Antonio crews. Every technician we send to your door has passed a background check and identity verification through the Threshold Standard, and you’ll see the tech’s name and photo before they ring your bell. They show a photo ID at the door, every time, no exceptions. That’s not an add-on. It’s how we’ve operated since 2002, as part of the Threshold Group family of home-service companies.
We also answer the phone with a live person around the clock. If you’re smelling gas or noticing soot streaking across your mantel at 11 p.m., you won’t get a voicemail.
Styles & brands we work with
Our Gas Fireplace Repair Services in San Antonio
Gas Fireplace Diagnostic and Repair
When a gas fireplace in San Antonio won’t light, burns weak or yellow, or shuts off mid-cycle, we start with a systematic diagnostic rather than throwing parts at it. Common fixes involve thermopiles, thermocouples, gas valves, and pilot assemblies. You’ll get a written price before any work begins, so there’s no surprise at the end of the job. And every repair carries a written guarantee: if it fails, the second visit is free.
Clay Tile Flue Repair and HeatShield Resurfacing
This is where San Antonio’s history shows up in your gas fireplace. Homes in King William and Monte Vista were built with clay tile flue liners that crack from thermal shock: those brief winter cold snaps freeze moisture inside the clay, and the summer heat bakes it. The result is spalling, gaps, and unvented carbon monoxide. When our camera inspection confirms damage, we repair it properly, often with a HeatShield resurfacing system or a DuraFlex stainless liner sized for gas appliances. You see the footage before we recommend a single dollar of work.
Chimney Cap Installation and Replacement
San Antonio’s thunderstorms and hail do real damage to chimney caps and crowns. A missing or rusted cap lets rain straight down into your gas fireplace firebox, where it corrodes burners and logs. We install galvanized and stainless caps from Olympia Chimney and Famco, sized to your flue and gas venting requirements. In older neighborhoods inside Loop 410, a proper cap with a screened top also keeps chimney swifts, a protected species, from nesting in your gas vent.
Venting Corrections for Prefab and Masonry Systems
Post-war tract homes around San Antonio often have prefabricated metal chimneys with undersized or misaligned gas flues. Those produce weak draft, soot on the glass, and a musty smell after rain. We inspect, reseal, and when necessary replace vent sections to restore proper airflow. If your home has a masonry chimney converted from wood to gas, we’ll verify the liner diameter matches the appliance, because gas produces different exhaust temperatures and condensation than wood ever did.
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 San Antonio
We stock and install professional trade materials from Olympia Chimney, Famco, and DuraFlex, the same brands chimney professionals specify. That matters in San Antonio because a box-store cap or an undersized liner from a hardware shelf won’t survive here. Our humid subtropical climate means damp, and our storms mean wind-driven rain. You want stainless and galvanized steel built for that, not whatever was cheapest on the shelf. Parts are sourced locally for San Antonio crews, so turnaround is usually measured in days, not weeks.
Common Gas Fireplace Repair Problems We See in San Antonio Homes
- Cracked clay tile liners in historic districts. King William and Monte Vista homes built before 1940 often vent gas fireplaces through original clay tile flues. Freeze-thaw cycles crack those tiles, and the gaps leak carbon monoxide into living spaces.
- Failed flashing and crowns after thunderstorms. Heavy rain and hail on early 20th-century brick chimneys tear up flashing and mortar. Water gets into the gas firebox, rusting burners and logs and leaving a musty smell after every storm.
- Undersized prefab vents in suburban homes. Post-war and 1980s-era tract homes around San Antonio sometimes have metal flues that were never sized for the gas appliance installed later. The result is draft failure, soot buildup, and a fireplace that won’t stay lit.
- Chimney swift nests blocking gas vents. Inside Loop 410, particularly in older neighborhoods, chimney swifts build nests in uncapped flues every spring. Since the swifts are protected, removal has to happen at the right time, and the fix is a proper screened cap that keeps them out for good.
See the difference
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After
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After
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AfterPricing for Gas Fireplace Repair in San Antonio, TX
A standard gas fireplace diagnostic in San Antonio runs $89 – $129, and that fee is applied toward the repair when you book it. Common repairs like thermocouple or pilot assembly replacement typically run $180 – $320. Gas valve replacement lands between $280 and $450. Clay tile flue repair or HeatShield resurfacing is the bigger-ticket item, usually $600 – $1,200 depending on flue height and access. A new chimney cap from Olympia Chimney or Famco, installed, runs $180 – $350. Every quote is written, flat, and delivered before work starts. Call (903) 515-5079 for a free estimate.
We Also Serve Cities Near San Antonio
Our San Antonio crews also run Gas Fireplace Repair in San Antonio and the surrounding area, including Converse, Schertz, Cibolo, and Boerne. If your home sits just outside the city limits, call us anyway. We schedule local routes and will give you an honest answer about timing and pricing before you’re stuck waiting all afternoon.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 – Gas Fireplace Repair in San Antonio
Yes, and the reason is San Antonio’s freeze-thaw cycles. Even a fireplace you light twice a year sits inside a flue that heats and cools with the weather. Clay tile liners in older San Antonio homes crack from exactly that thermal movement, and a cracked liner leaks carbon monoxide whether you’re burning gas or not. An annual Level 1 inspection costs less than most repairs. Call (903) 515-5079 to schedule one. The estimate is free.
Sometimes, but only if a camera inspection confirms the flue is sound or after it’s relined with a system like DuraFlex or HeatShield. Unlined brick chimneys were built for wood smoke, not gas exhaust. Gas burns cooler and produces condensation that soaks into old mortar, and if those clay tiles are cracked or missing, you’re venting carbon monoxide into your house. We will never recommend a liner without showing you the footage. If the camera says the flue is fine, we’ll tell you that too.
Hail hits the metal components first: the chimney cap, the crown flashing, and any exposed vent termination. A dented cap can restrict draft or let rain pour straight down into the firebox, rusting the gas logs and burner assembly. After a big San Antonio hailstorm, it’s worth a visual check. We can inspect and replace a hail-damaged cap for $180 – $350. Call (903) 515-5079 if you want an exact quote.
That smell is usually water pooling in the firebox or soaking the firebrick after rain gets past a failing crown or flashing. In Monte Vista’s older brick chimneys, decades of storm cycles have opened hairline cracks in the mortar. We find the leak with a camera, not guesswork, and fix it with proper flashing repair or crown sealing. The musty smell is not something you should live with. Call (903) 515-5079 and we’ll diagnose it.
Yes, and they’re protected, so you can’t just remove an active nest. Chimney swifts nest in uncapped flues all over San Antonio inside Loop 410, including gas vents that are no longer in use. The correct fix is a screened cap installed at the right time of year after any active nesting period ends. We install capped, screened terminations from Olympia Chimney and Famco that keep swifts out permanently while still venting your gas appliance correctly. Call (903) 515-5079 for a free estimate on a cap and screen.
Get Your San Antonio Gas Fireplace Fixed the Right Way
In King William and Monte Vista, the older chimneys tell the truth if you look inside them. We ran a camera through a Madison Street Victorian’s flue and found the gas fireplace venting into a 1920s clay tile flue with spalling and a cracked liner. We showed the homeowner the footage, resurfaced the damaged section with HeatShield, and capped the unused gas vent to keep out chimney swifts. That’s how we work in San Antonio: no liner, cap, or repair gets recommended unless we can show you exactly why it’s needed. You’ll know the technician’s name and see their photo before we arrive, and the written quote comes before any work starts. Call (903) 515-5079 now for a free estimate, and we’ll put a live person on the line.
Written by Ruben Castellano, Owner at Alcott Chimney San Antonio, serving San Antonio since 2002.