Reliable Heat for Every West County Winter.

Most gas fireplace and insert installations in Des Peres run between $4,000 and $10,000, with the spread coming down to the unit itself, the venting path, and whether new gas line work is required. A direct-vent insert dropped into an existing masonry fireplace with a gas line already nearby tends to land on the lower end. A new built-in gas fireplace for a remodel or room addition—with framing, direct-vent piping through an exterior wall, and a fresh gas tap off your existing line—runs closer to the middle or higher end. A local dealer will give you a firm number after seeing your fireplace or wall cavity in person.

Yes, and it's one of the most common projects in Des Peres, where a lot of the housing stock from the 1960s through 1980s was built with a traditional masonry fireplace that rarely gets used. A gas insert typically slides into that existing firebox with a stainless liner run up the chimney for venting, and the cost usually falls in the $4,000 to $8,500 range depending on whether a new gas line needs to be run to the fireplace. Since most Des Peres homes are already piped for natural gas through Spire for the furnace and water heater, tapping in a branch line for the fireplace is usually straightforward for a licensed installer.

Nearly every home in Des Peres has access to natural gas service through Spire, so propane is rarely necessary here—it's more common in unincorporated, rural pockets of St. Louis County that gas mains haven't reached. If you're in one of the rare Des Peres properties without a gas main nearby, a propane tank installation is still an option and most fireplace models can be configured for either fuel. For the vast majority of homeowners, though, tapping into existing natural gas service is the simpler and cheaper route.

Most modern gas fireplaces will, as long as they use a standing pilot or an IPI (intermittent pilot ignition) system with battery backup—the AA batteries inside the unit keep the ignition working even when the grid, in this case Union Electric (Ameren Missouri), goes down. Ice storms are the main reason St. Louis-area homeowners lose power in winter, and a battery-backed gas fireplace will still light and heat the room on demand. Some brands, including Valor, go a step further with self-powered pilot systems that generate their own electricity from the pilot flame, so there's no battery to remember at all. Ask your local dealer which ignition system is on the model you're considering.

A gas fireplace is a fully built-in unit framed into a wall—the right call for a room addition or a remodel without an existing chimney. A gas insert is sized to slide into an existing masonry firebox, which describes a large share of Des Peres's older housing stock, and it uses the existing chimney as the vent path with a liner. A gas stove is a freestanding cast-iron or steel unit that sits on the floor and vents through a wall or existing flue—a good option for a basement or sunroom without a fireplace opening. Most Des Peres homeowners with an underused masonry fireplace end up choosing an insert.

Yes—the City of Des Peres requires a building permit for gas fireplace installations, and any new or modified gas line needs to be run by a licensed gas-fitter and inspected separately. Most established hearth dealers in the St. Louis metro handle both the building permit and the gas line coordination as part of the installation, so you're not left juggling separate contractors and inspections. It's worth confirming your installer is pulling permits through the city rather than skipping the step—uninspected gas line work is one of the more common issues that surfaces during a home sale inspection.

Vented, direct-vent gas fireplaces draw combustion air from outside and exhaust combustion byproducts back outside through sealed piping—they're the standard choice and produce real, substantial heat. Vent-free (ventless) units burn gas directly into the room without external venting; Missouri permits them, but they come with strict room-size minimums and require an oxygen depletion sensor, and many homeowners still prefer not to introduce combustion byproducts into a living space. For a well-insulated Des Peres home, direct-vent units are the more common recommendation from local dealers, and they don't require any tradeoffs on indoor air quality.

Plan on an annual inspection, ideally in early fall before the heating season starts. A technician checks the burner, pilot assembly, venting, and gas connections, and cleans the glass and interior components. This is a much lighter lift than chimney sweeping for a wood-burning unit, but it matters—a dirty pilot assembly or a small gas leak at a fitting are the most common issues that turn up. Local gas appliance service providers in the St. Louis area typically charge $150 to $250 for this annual visit.

Gas delivers real heat output—enough to genuinely warm a family room on a 22°F night—and it's an easy retrofit for the many Des Peres homes with an existing masonry fireplace and gas service already at the house. Electric fireplaces plug into a standard outlet, need no venting or gas line at all, and install in an afternoon for $400 to $1,200, which makes them a good fit for condos, finished basements, or a secondary room where running gas line isn't practical. Since Union Electric's residential rate runs around 12.6 cents per kWh, electric units are cheaper to install but cost more per hour to run as heat rather than ambiance. For a primary living space, most Des Peres homeowners choose gas; for a bedroom, basement, or rental unit, electric is often the simpler answer.

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.

If it was installed more than 15 years ago, probably. Older gas fireplaces keep a standing pilot light burning all the time, and that little flame can cost a couple hundred dollars a year. Newer models use pilot-on-demand ignition—the pilot lights only when you use the fireplace and goes out when you turn it off.

Yes—by creating a comfort zone. A furnace heats every square foot of the house just to warm the one room you're in; a gas fireplace on low burns roughly a sixth of the gas a typical furnace does. Set the furnace around 55–60 degrees as a baseline, then heat the rooms your family actually uses. Families who heat this way commonly save $20–$60 a month.

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.