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 Lafayette
Gas fireplace repair in Lafayette typically runs $185 – $520 for common fixes like burner cleaning, thermocouple replacement, or damper adjustment, with liner work starting around $2,900. Most repairs are completed in one visit, and we stock the parts Lafayette homeowners actually need, so you’re not waiting a week for a thermopile while your living room stays cold. Our crews know the hillside canyon neighborhoods, the mid-century ranch layouts, and the aging flue systems behind a lot of Lafayette’s gas log sets. If your fireplace won’t light, smells odd when it does, or has been sitting unused since last spring, call us at (831) 534-3789 and we’ll get a technician to your home, usually within a few days.
Why Alcott Chimney San Francisco Is Lafayette’s Preferred Gas Fireplace Repair Company
We’ve spent more than two decades working on exactly the kind of chimneys Lafayette has in abundance: original 1950s and 1960s brick and stone stacks, many still unlined or running on cracked clay tiles. That local familiarity means we don’t walk into your home guessing. We know where damp marine-layer air does the most damage, what creosote conversion issues look like behind the damper, and why a gas log set in a 1965 split-level on a Reliez Valley hillside behaves differently than one in a newer flatland tract.
Every technician we send to Lafayette is background-checked, identity-verified, uniformed, and announced to you by name and photo before arrival. That’s the Threshold Standard, and it’s not optional. When our tech rings your doorbell, you’ll already know their name and face. Lafayette homeowners appreciate that, especially the ones who are home alone during the day or have young kids. And every repair comes with a written price before we start and a written guarantee when we finish, including a free return visit if the repair fails. We work this way because Ruben Castellano built this company on the idea that chimney work should never be a leap of faith.
Styles & brands we work with
Our Gas Fireplace Repair Services in Lafayette
Level 2 Camera Inspection for Gas Fireplace Flues
Before we touch a gas fireplace in Lafayette, we recommend a Level 2 camera inspection. Here’s why: a huge share of Lafayette’s homes were built in the 1950s through 1970s with original flues that were never designed for gas exhaust. Gas burns cooler than wood and produces acidic condensation that eats mortar joints from the inside. A camera shows us cracked clay tiles, spalling mortar, and nests, all in about 45 minutes, and you see the images yourself. Nothing gets recommended unless you’ve seen the evidence, and most inspections run $225 – $385.
Flue Liner Installation (DuraFlex and HeatShield)
When we find an unlined or deteriorating flue in a Lafayette home, the fix is usually a listed stainless liner sized for the specific gas appliance. We install DuraFlex systems because they’re specified by chimney professionals for gas venting and hold up to acidic condensate. In some cases, HeatShield resurfacing can restore a clay-tile flue without a full reline. Liner installation in Lafayette typically runs $2,900 – $6,500 depending on chimney height and roof access from our staging area, and the work takes one day in most single-story ranches. On hillside two-story homes, expect the upper end of that range.
Gas Log Set Burner and Damper Commissioning
Gas log sets are not plug-and-play. The burner needs to be matched to the firebox size, the damper needs a proper clamp so it can’t fully close while gas is flowing, and the venting has to be verified for the specific BTU output. In Lafayette’s older fireplaces, we routinely find dampers rusted open or wedged shut because they were never adjusted when a wood firebox was converted to gas. Commissioning a gas log set properly, including burner cleaning, flame pattern adjustment, and damper work, usually falls between $210 and $390.
Carbon Monoxide and Draft Verification
After any gas fireplace repair in Lafayette, we test actual draft and check for carbon monoxide spillage at the firebox opening. This matters more here than in drier inland cities because Lafayette’s marine layer and tight canyon air can reduce natural draft, especially on foggy winter mornings. We measure CO at the firebox with a calibrated meter and verify that exhaust is leaving the home. If we find a draft problem, we’ll show you the reading and explain exactly what’s causing it before recommending any work. A draft and CO verification alone runs $150 – $225 and is included with most repair visits.
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 Lafayette
We work on gas fireplaces and venting systems from the brands Lafayette homeowners actually have in their homes. That includes Olympia Chimney and Famco components found on many local gas log sets, as well as Copperfield dampers and accessories. Because we install these same professional-grade brands, we keep common parts in stock locally, which means faster turnaround on repairs. If your Lafayette fireplace needs a replacement thermocouple, burner pan, or damper clamp, there’s a good chance we have the correct part on the truck. We’re the Gas Fireplace Repair team that doesn’t make you wait for a part that should already be in the truck.
See the difference
Before
After
Before
After
Before
AfterCommon Gas Fireplace Repair Problems We See in Lafayette Homes
- Unlined original brick chimneys with spalling mortar. Many 1950s brick chimneys in Lafayette were built without a flue liner at all. Acidic gas exhaust condenses on the brick and eats the mortar, and pieces of spalled mortar fall into the firebox and block the draft. This is common in the older hillside neighborhoods, where chimneys are exposed and take the full brunt of winter moisture.
- Raccoon and squirrel nests blocking gas exhaust. In Happy Valley and Reliez Valley, spring nesting season brings raccoons and squirrels into unused chimneys. When fall comes and you light the gas logs for the first time, the nest restricts exhaust flow and pushes carbon monoxide back into the living room.
- Damp marine-layer winters hardening creosote inside converted flues. When Lafayette homeowners convert a wood fireplace to gas, the old creosote can remain inside the flue. Damp winter air breaks it down, then dry summer heat bakes it into a hard glaze that cracks and restricts draft. This is exactly what a camera inspection reveals before it becomes a chimney fire risk.
- Damper clamps missing or installed wrong after conversion. Any gas log set in Lafayette needs a damper clamp that prevents full closure, but we find many older conversions with no clamp at all, or with a clamp that lets the damper close anyway. A closed damper with gas burning sends carbon monoxide into the room, not up the flue.
Pricing for Gas Fireplace Repair in Lafayette, CA
Here’s what Lafayette homeowners can expect to pay, based on what we’ve actually billed over the past year in this city’s market:
- Diagnostic service call and basic burner cleaning: $95 – $185
- Thermocouple or thermopile replacement: $185 – $320
- Full gas log set cleaning and flame adjustment: $210 – $350
- Damper clamp installation or replacement: $145 – $240
- Level 2 camera inspection: $225 – $385
- DuraFlex flue liner installation: $2,900 – $6,500
- HeatShield resurfacing: $1,800 – $4,200 depending on flue length
Hillside homes with steep roof access run higher on labor, and original unlined chimneys often require liner work before gas appliances can be safely commissioned. Every quote is written down before work starts. You’ll never get a surprise add-on at the end. Call (831) 534-3789 for a free estimate.
We Also Serve Cities Near Lafayette
In addition to Gas Fireplace Repair in Lafayette, our service area covers Walnut Creek, Orinda, Piedmont, and Oakland. If you’re in one of those cities and need gas fireplace work, the same camera-first standard and written guarantee apply.
Serving Lafayette, CA - Our Local Coverage Area
We’re based in the Lafayette 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 Lafayette
Because a significant share of 1950s-1970s hillside homes in Lafayette still have original unlined or clay-tile flues, and gas exhaust condenses acidically inside them, eating mortar joints and causing spalling that blocks the draft. A camera inspection shows you exactly what’s inside your flue before anyone recommends a liner or rebuild. This is the single most important check for older Lafayette homes. Budget $225 – $385 and about 45 minutes for the inspection. Call (831) 534-3789 to schedule one; if the flue is fine, you’ll have the photos to prove it.
Yes. We regularly find raccoon and squirrel nests in Lafayette chimneys, especially in Happy Valley and Reliez Valley, and those nests block gas exhaust flow. When you light your gas fireplace in the fall, the restricted venting pushes carbon monoxide back into the home. The fix is removing the nest, verifying the flue with a camera, and installing a proper chimney cap so it doesn’t happen again. Most nest removals with a stainless cap run $450 – $850 in Lafayette, and the CO risk is real enough that we recommend checking before first fall use.
Lafayette’s marine-layer influence means flues absorb moisture all winter, and that moisture accelerates spalling in old mortar and helps creosote from previous wood burning condense inside the flue. The damp air also reduces natural draft, especially on foggy mornings. The result is a fireplace that’s more likely to spill carbon monoxide into the living room on exactly the days you want it running. This is a Lafayette-specific condition we don’t see as severely in Walnut Creek or other inland Lamorinda cities.
Maybe, but you can’t assume it is. The original flue was sized for wood exhaust, which is hotter and drafts differently than gas. If the conversion didn’t include a proper liner, the old clay tiles may have deteriorated from acidic gas condensate, or the damper may have been closed improperly. We recently worked on a 1960s split-level in Reliez Valley where the original clay-tile flue had no listed liner and spalling mortar chips were sitting on the firebox floor. We lined it with a DuraFlex system sized for the gas log set before commissioning. That job cost $4,300, and the homeowner saw every image before approving anything.
Not necessarily a full camera inspection every single year, but an annual visual check is worth it for Lafayette homes with original flues. Gas fireplaces produce less creosote than wood, but Lafayette’s damp winters can still degrade mortar, and animals can move in during the months the fireplace is unused. A Level 1 visual inspection runs $95 – $150 and catches most problems early. If the flue is original clay tile, a Level 2 camera inspection every 3-5 years is a reasonable cadence. The annual check is cheap insurance. Call (831) 534-3789 and we’ll schedule it at your convenience.
Written by Ruben Castellano, Owner at Alcott Chimney San Francisco, serving Lafayette since 2002.