Gas fireplace inspection for a home sale in Larimer County: what inspectors flag

September 8, 2026

A gas fireplace is a small part of a house and an outsized part of an inspection report, because it sits at the intersection of three things a general home inspector is trained to be cautious about: fuel gas, combustion products, and clearance to combustibles. In Larimer County, where a large share of the housing stock came with a fireplace as standard equipment, it shows up on nearly every report. Here is what actually gets written down, what it costs to clear, and how to get in front of it.

The short version for a seller: a $125 to $250 safety inspection and leak check before listing, or $175 to $350 per fireplace for a full annual service that includes the same checks, produces a document instead of a negotiation.

The single most common finding: “not tested”

More fireplaces are flagged for not being operated than for anything actually wrong with them. A general inspector arrives, finds a cold standing pilot or an electronic unit with a dead battery pack, and writes that the appliance could not be evaluated. A buyer reads “not tested” as “unknown liability,” and the fireplace becomes an inspection objection about a thermocouple.

That is entirely avoidable. Have the pilot lit and the unit working before the inspection. If it will not light, that is worth knowing weeks before, not on the day.

What inspectors flag, and what it costs to clear

Gas odor or a suspected leak. The report language is usually blunt and the recommendation is immediate. If you smell gas at any point, before an inspection or during one, the response is the same: leave the house, leave the door open behind you, do not touch a light switch or a garage door opener, and call your gas utility’s emergency line or 911 from outside. Xcel Energy is the natural gas utility named on Larimer County’s provider list; Greeley and parts of Weld County are Atmos Energy. A technician comes after the utility, not before. Tracing and repairing a small leak at a flare fitting or a pilot tube is usually inside the $150 to $300 service call; a failed gas valve is $500 to $1,000.

No carbon monoxide alarm, or an expired one. Cheap to fix, always written up, and worth doing before listing rather than arguing about. Check the manufacture date on the back; most alarms expire at seven to ten years.

Soot on the glass, the logs, or the wall above the opening. Inspectors read soot as incomplete combustion, and they are right to. Soot on the wall or mantel above the opening is the serious version, because it suggests spillage into the room. Most sooting is log placement, a dirty burner, or an altitude orifice that was never fitted, and most of it clears inside the service call.

A damaged or missing glass gasket. On a sealed direct-vent unit the gasket around the glass is what keeps exhaust out of the room. Hard, flattened, or missing sections get flagged as a safety item, correctly. Glass and gasket is $200 to $600.

Cracked or missing glass, or a missing safety screen. Ceramic glass is model-specific and cannot be cut locally, so a cracked pane means ordering. On barrier screens, the manufacturers are unambiguous: Heat & Glo’s own safety guidance says the glass and metal around a fireplace reach extreme temperatures and stay hot after shutdown, and that a safety screen securely in place during operation reduces the risk of burns. A missing screen on a house being sold to a family with small children is a reasonable thing for a buyer to raise.

Clearance to combustibles. A mantel too close, a television mounted directly above the opening, or framing and trim inside the manufacturer’s stated clearance. This one is genuinely common in remodels, and it is the finding most likely to require work rather than a service visit.

Vent termination problems. Blocked, damaged, too close to a window or a walkway, or with landscaping grown into it. Inspectors check the outside as well as the inside.

Unpermitted work. A gas line that was clearly added, or a fireplace that does not match the house’s permit history. This is the one that turns into a real delay.

The permit question, jurisdiction by jurisdiction

Repairs do not need permits. Appliances and gas piping do, and northern Colorado is a patchwork.

Unincorporated Larimer County, which includes Laporte and rural addresses, issues a Miscellaneous Permit, and its list explicitly names Fireplace, Gas Log Inserts, and Gas Line and Gas Appliances.

Fort Collins lists “Fireplace, Wood Stove or Fire Pit” as permitted work, treats a heating device added to a previously unheated space as a remodel or alteration permit, and takes a mechanical permit when a gas line is installed for a heater. The city also issues two trade licenses that describe this work almost exactly: a Fireplace Appliance license for installing non-portable listed manufactured fuel-burning fireplace appliances and their chimneys or vents, and a Gas Piping license for installing piping and fittings supplying fuel gas.

Loveland runs its own Building Division and permits plumbing and fuel gas piping work with inspections.

Weld County adopted the 2024 International Building, Residential, Mechanical, Plumbing and Energy Conservation Codes effective June 15, 2026. Within it, Johnstown lists a new or replacement fireplace as permitted work, runs permits through its eTRAKiT portal with SafeBuilt handling code review and inspections, and requires every contractor to hold a town license. Milliken names gas fireplaces among its counter permits and requires a Colorado licensed plumber for plumbing work unless the homeowner files a notarized affidavit. Severance and Berthoud each run their own building and permits functions.

Gas piping is state-regulated plumbing in Colorado on top of all of that. The permits and altitude page lays the whole thing out in one place.

For buyers: what to ask for

Ask for the fireplace to be lit for the inspection. Ask for the model and serial number from the rating plate, which on most units is behind the lower louver near the controls, and on Majestic and Monessen units is on a plate hanging from the wiring inside the control door. With a serial number you can check the appliance against the Consumer Product Safety Commission’s recall record, which carries real entries for these brands: a 2014 Hearth & Home Technologies recall covering Heat-N-Glo, Heatilator, Outdoor Lifestyles and Quadra-Fire units for a gas valve that could leak, a 2012 Monessen recall of Signature Command controlled Majestic, Monessen and Vermont Castings units where a control fault could let gas flow without lighting, and propane delayed-ignition recalls on Napoleon inserts and fireplaces in 2008 and 2014.

Then ask the age. A 25-year-old direct-vent unit in south Fort Collins or Loveland is not a defect, but it is likely on its original thermopile, gasket, and blower, and budgeting $200 to $600 for the first winter is realistic.

For sellers: the cheapest move

Book the specialist visit before listing, not after the inspection objection. A written result from a technician who leak-checked the appliance, took a carbon monoxide reading, measured the millivolt output, checked the vent and the clearances, and cleaned the unit costs $125 to $350 and answers the fireplace section of the report before the buyer’s inspector writes it. Compare that with a repair negotiated under a deadline, where the number is whatever the other side’s contractor says it is.

Numbers on this page are the same ranges published on the pricing page, and the service and install estimator will price a pre-sale visit on one or several fireplaces.