Real Fire, Flip of a Switch, in Frontenac.

For a St. Louis County home like the ones common in Frontenac, a direct-vent gas insert into an existing masonry fireplace typically runs $4,000 to $8,000, with the gas line already in place holding costs to the lower end. A new built-in gas fireplace for a remodel or addition—with framing, venting, and a fresh gas line run from the meter—usually lands higher, often $7,000 to $12,000 depending on the run length and finish work. A local dealer will give you a firm number after seeing your existing chimney or framing in person.

Yes, and it's one of the most common projects in Frontenac given how many homes here still have an original 1950s or 1960s masonry firebox. A gas insert with a stainless steel liner run up the existing flue is the standard approach—it keeps the look of the original brick surround while eliminating ash, drafts, and the need to ever load wood. Since Spire natural gas already reaches nearly every home in the city, most conversions just need a gas line tapped off an existing appliance line rather than a long new run, which keeps costs down.

Almost every home in Frontenac has access to natural gas through Spire, so propane is rarely necessary here—unlike more rural parts of St. Louis County where propane tanks are still common. If your home already runs a gas furnace, water heater, or range, extending a line to a fireplace location is usually straightforward for a licensed gas-fitter. Propane remains an option for detached structures or outbuildings without an existing gas connection, but for the main house, natural gas is the default.

Most modern gas fireplaces will, which matters in St. Louis County given how ice storms have knocked out power across the region in recent winters. Units with IPI (intermittent pilot ignition) run on a battery backup that kicks in the moment power drops, so the fireplace lights on demand just like normal. Valor units go a step further—their pilot's thermocouple generates its own electricity, so there's no battery to remember at all. If backup heat during an outage is a priority for your Frontenac home, ask your local dealer which ignition system a given model uses before you buy.

A gas insert slides into an existing masonry firebox and is the natural fit for Frontenac's older brick colonials that already have a chimney. A built-in gas fireplace is framed into a wall from scratch, which is more common in the newer custom homes going up near Plaza Frontenac or in additions. A freestanding gas stove sits on the floor like a wood stove but runs on gas—a less common choice here, but sometimes used in a sunroom or finished basement where there's no existing chimney to work with. A local dealer can walk your specific space and tell you which category applies.

Yes. The City of Frontenac's building department requires a permit for gas fireplace installations, and the gas line portion of the work must be done by a licensed gas-fitter and inspected separately from the general building permit. Most established hearth dealers in the area handle this coordination as part of the installation, pulling both permits and scheduling the inspections so you aren't managing multiple trades and two different city sign-offs on your own.

Vented (direct-vent) gas fireplaces draw combustion air from outside and exhaust exhaust gases back outside through sealed piping—they're the standard, code-compliant choice everywhere, including Frontenac. Vent-free units are legal in Missouri under specific room-size and oxygen-depletion-sensor requirements, but given Frontenac's tighter, well-insulated homes and the city's active architectural review process for exterior changes, most homeowners here end up choosing a direct-vent unit anyway—it avoids indoor air quality tradeoffs and simplifies the permitting conversation. Ask your dealer to walk through both if you're weighing the choice for a specific room.

Plan on an annual inspection, ideally before the first cold snap each fall. A technician checks the burner, pilot assembly, gas connections, and venting, and cleans the glass and interior—a much lighter job than chimney sweeping but still important, especially for units that see daily use through a typical Frontenac winter. Local gas appliance service providers generally charge $125 to $200 for a standard annual visit.

For most Frontenac homeowners, no. There's no nearby public land with cutting permits the way there is in more rural parts of Missouri, lot sizes in the city don't leave much room for stacked firewood, and there's little cultural reliance on wood as primary heat here the way there is in colder, more rural regions. A handful of homeowners keep an existing masonry fireplace burning wood occasionally for atmosphere, but nearly all new installations and conversions in Frontenac go to gas, with electric fireplaces as the other realistic option for rooms without gas access.

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.

An insert is a fireplace that slides into a pre-existing wood-burning fireplace—if you don't have one, there's nothing to insert it into. A zero-clearance fireplace is built into a framed wall, which makes it the answer for remodels and new construction. Simple test: existing masonry fireplace means insert; blank or framed wall means zero-clearance.

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.

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.