Trade Your Old Masonry Fireplace for Instant Gas Heat.

Most gas fireplace and insert installations in the Warson Woods area run between $3,500 and $9,500, depending on the unit, whether you're converting an existing masonry fireplace or building new, and whether a gas line extension is needed. Because so many homes here were built in the 1930s-1950s with an existing wood-burning masonry fireplace and chimney, a direct-vent gas insert using that existing flue with a stainless liner is the most common (and least expensive) path. New construction or a fireplace added to a room that never had one costs more once framing, venting, and a fresh gas line run are factored in.

Yes—this is the single most common gas project in Warson Woods, given how many homes still have their original masonry wood fireplace. A gas insert slides into the existing firebox, and a stainless liner runs up the original chimney to vent safely. It preserves the look of the fireplace while eliminating the draft, ash, and creosote maintenance that come with the wood-burning version. Expect $4,000 to $8,500 depending on the insert and whether new gas line work is required to reach the fireplace location.

Nearly every home in Warson Woods already has natural gas service for the furnace and water heater, with Spire serving as the regional utility across St. Louis County—so adding a gas fireplace is usually just a matter of running a new branch line from the existing meter. Propane is rarely used inside the village itself; it's more common in outlying rural parts of St. Louis County without gas mains. Most fireplace models can be configured for either fuel, but for Warson Woods homeowners, tapping into existing natural gas service is almost always the simpler and cheaper route.

Most modern gas fireplaces will, which matters here—ice storms are a recurring feature of St. Louis County winters and can leave neighborhoods without power for a day or more. Units with intermittent pilot ignition (IPI) include a battery backup that keeps the fireplace lighting on demand even with the grid down. Valor fireplaces take it a step further: their pilot assembly generates its own electricity through the thermocouple, so there's no battery to remember to replace. Ask your local dealer which ignition system is on any unit you're considering—it's a meaningful difference during a multi-day outage.

A gas fireplace is a fully built-in unit framed into a wall—typically used in new construction or a room without an existing fireplace. A gas insert is built to slide into an existing masonry firebox, which describes the vast majority of Warson Woods homes with their original 1930s-1950s wood fireplace. A gas stove is a freestanding cast-iron or steel unit that sits on the floor and vents through a wall or existing chimney. For most homeowners here, an insert is the right fit since it works with the fireplace you already have.

Yes—the Village of Warson Woods Building Department requires a building permit for gas fireplace installations, and the gas line work itself must be done by a licensed plumber or gas-fitter and separately permitted. Because Warson Woods is a small village, most homeowners find it simpler to work with a hearth dealer who coordinates permitting, the gas line trade, and the final inspection as one job rather than juggling contractors themselves.

Vented (direct-vent) gas fireplaces draw combustion air from outside and exhaust it back outside through a sealed pipe—they're the cleanest and most universally recommended option. Vent-free units burn gas directly into the room without external venting; Missouri permits them, but they come with strict room-size and ventilation requirements and release some moisture and combustion byproducts indoors. For the older, well-sealed homes common in Warson Woods, direct-vent units are the more common recommendation—they don't add humidity to a house that may already have older windows and less mechanical ventilation than newer construction.

Plan on an annual inspection, ideally in early fall before the first cold snap. A technician checks the burner, pilot assembly, gas connections, and venting, and cleans the glass and interior—a much lighter job than sweeping a wood chimney, but still important, especially for a fireplace installed inside an original 1930s-1950s masonry chimney where the liner and clearances should be re-checked periodically. Most St. Louis-area service providers charge $150 to $250 for a standard annual visit.

For most Warson Woods homes, no—wood-burning appliances are uncommon here. The village's small lots leave little room to store cordwood, there's no nearby public forest land for cutting permits the way there is in more rural parts of Missouri, and the oak, hickory, and walnut firewood that grows regionally isn't something most residents are set up to source and season themselves. A handful of homeowners keep their original masonry fireplace burning wood occasionally for ambiance, but for anyone looking to actually heat a room reliably, a gas insert into that same fireplace is the far more practical local choice.

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.

Yes—with an asterisk. Fireplaces are hot and TVs don't like heat. Either put a mantel between them to deflect rising warmth, or choose a fireplace with heat-management technology that creates a cool zone on the wall above—the wall stays around 125 degrees, barely warm, while the room still gets full heat. If you like clean lines and don't want a mantel, heat management is the answer.

If you're putting a fire in your house on purpose, it's best to work with an expert. Unless you're genuinely experienced in framing, gas line, vent pipe, and the national code on clearances to combustibles, have a professional do it—and ideally the same company that sells you the fireplace, so warranty, service, and liability all live under one roof.

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.