Gas Heat Built for Longmont's Front Range Winters.

Across the Denver-Boulder corridor, a typical gas fireplace installation runs roughly $4,500 to $11,000 depending on the unit, the venting path, and whether new gas line work is needed. A direct-vent insert into an existing masonry fireplace with gas already run to the room sits on the lower end. A new built-in unit in a remodel or addition—with framing, venting, and a fresh gas line—lands in the middle to upper range. Because Longmont sits close to 5,000 feet, factor in a modest add-on for a high-altitude orifice or regulator kit, which most local installers already stock. A firm number comes after an in-home consultation.

Yes, and it's one of the more common projects in Longmont's older neighborhoods, where many bungalows and split-levels built before the 1990s still have open masonry fireplaces. With rising wildfire smoke concerns each summer and fall and a general Front Range shift away from new wood-burning appliances, converting an existing wood fireplace to a gas insert has become a popular way to keep the look of the original hearth while getting cleaner, on-demand heat. The insert typically vents through a stainless liner run up your existing chimney, and cost depends mainly on whether a new gas line needs to be run to the fireplace.

Either works, but which one you use often comes down to where you live. Most of incorporated Longmont has natural gas service through Xcel Energy, so if your home already has gas appliances, adding a fireplace is a straightforward tie-in. Homes in unincorporated Boulder County or on the edges of town without gas mains typically run on propane, either from an existing tank or a new tank installed by a local propane supplier. Most gas fireplace models can be configured for either fuel—your installer sets the correct orifice and regulator pressure during installation, along with any high-altitude adjustment your elevation requires.

Most modern gas fireplaces will, which matters in Longmont given how often spring windstorms and heavy wet snow along the Front Range knock out power for hours at a time. Units with IPI (intermittent pilot ignition) run on a small battery backup that kicks in automatically when the power drops, so the fireplace still lights on demand. Valor fireplaces take a different approach—their pilot assembly generates its own electricity through the thermocouple, so there's no battery to remember or replace. Either way, ask your local dealer about the ignition system before you buy if outage backup matters to you.

A gas fireplace is a fully built-in unit framed into a wall, typically chosen for new construction or a remodel. A gas insert drops into an existing masonry fireplace opening and uses your existing chimney as the vent path—the right call for older Longmont homes near downtown with a real hearth already in place. A gas stove is a freestanding unit that sits on the floor, useful in newer subdivisions or additions that were never built with a fireplace opening at all. Which one fits depends mostly on what you're starting with, not personal preference.

Yes. Inside city limits, the City of Longmont Building Division requires a building permit and a separate gas permit for any new gas fireplace or line work; homes in unincorporated Boulder County go through Boulder County Community Planning & Permitting instead. The gas line itself has to be run or modified by a licensed gas fitter. Most established local hearth dealers handle all of this as part of the installation, including coordinating the final inspection, so you're not left juggling separate trades.

Vented direct-vent units draw combustion air from outside and exhaust it back outside—they're the standard recommendation almost everywhere, including Longmont. Vent-free units burn directly into the room and rely on an oxygen depletion sensor (ODS) to shut off if oxygen drops too low, but those sensors are calibrated for specific elevation ranges, and many manufacturers restrict or derate vent-free operation above roughly 4,500 to 7,000 feet. At nearly 5,000 feet, Longmont sits right in that gray zone, which is part of why most local dealers steer homeowners toward vented direct-vent fireplaces here—they perform consistently regardless of elevation and don't require a judgment call about room size and ventilation.

Plan on an annual inspection, ideally before the heating season ramps up in October or November. A certified technician checks the burner, pilot assembly, venting, and gas connections, cleans the glass and interior, and confirms the unit is burning correctly at Longmont's elevation. This is a lighter service than chimney sweeping for a wood appliance, but it's still important—a gas fireplace that's burning improperly at altitude can produce excess soot on the glass or reduced heat output. Most local service providers charge in the $150 to $250 range for a standard annual visit.

Wood heat hasn't disappeared entirely—cutting permits are still available through the Arapaho-Roosevelt National Forests for $5 to $20 per cord during the May-through-October season, and some longtime Longmont homes still burn wood in existing fireplaces. But new wood-burning installations are genuinely uncommon here. Between the smoke that settles into the valley during wildfire season and a broader Front Range preference for cleaner-burning appliances, gas has become the practical default for anyone adding or replacing a fireplace. It lights instantly, produces no ash or creosote, and doesn't add to the air quality concerns Longmont already deals with each summer and fall.

An insert does two things: it seals the chimney completely, so you stop losing air you already paid to heat, and it radiates warmth into the room through the firebox and glass. Most add a heat-exchange fan that pulls cool room air underneath, wraps it around the hot firebox, and pushes it back out warm. Your home is more efficient before you've even lit the first fire.

Open fireplaces suck—literally. As the fire burns, it consumes air your furnace already paid to heat and pulls it out through the chimney, so the house is actually colder after the fire goes out than before you lit it. An insert fixes this: it seals the chimney, puts fixed glass across the front, and turns that hole in your house into a real heat source.

It's a visit where a hearth professional measures your space, confirms the model you picked actually works in your home, and walks the specs—framing, gas line, venting, finish work—before anything is ordered. Some details you just can't know until you see the house. Never make a down payment without one; it's the single most-skipped step that burns buyers.

For an average home—covering the fireplace, the vent pipe, and basic installation—a budget between $3,900 and $5,500 gives you a lot of options across wood, gas, and pellet. By the time you add finish work, gas line, and electrical, the average complete installation lands between $5,000 and $12,000 all-in. In a remodel or new build, a good rule is to put about 2.5% of the total project cost toward the fireplace.