Modern warmth for Kensington's historic homes.

In Kensington, a gas fireplace or insert installation typically runs $5,000 to $12,000, with DC-metro labor rates pushing costs a bit higher than the national average. A direct-vent insert dropped into an existing masonry fireplace with a gas line already run to the house sits toward the lower end. A new built-in gas fireplace in an addition or renovated room—requiring fresh gas line work, framing, and venting through an exterior wall—lands toward the higher end. Homes in the Kensington Historic District may see a modest added cost if the venting location needs Historic District Commission sign-off before the county issues a permit.

Yes, and it's the most common gas project among Kensington's older homes. Many of the town's Victorian and Craftsman houses have an original masonry firebox that was built for coal or wood and hasn't seen real use in years—wood burning isn't practical for most lots in town, and the fireplace often just sits cold. A gas insert typically costs $5,500 to $9,500 installed, using the existing chimney as the vent path with a stainless liner, and gets that fireplace producing real, usable heat again without any wood handling, ash, or storage.

Most Kensington properties are already served by Washington Gas, so if your home has gas heat, a gas water heater, or a gas range, adding a fireplace is usually a simple tie-in to existing service. A small number of homes on the edges of town or on larger lots without gas service use propane instead, which requires either an existing tank or a new tank installation from a regional propane supplier. Nearly every gas fireplace model on the market today can be configured for either fuel—your installer sets the correct orifice and regulator for whichever you have.

Most direct-vent gas fireplaces with intermittent pilot ignition (IPI) include a battery backup—typically standard AA batteries inside the unit—that keeps the fireplace operating normally during a power outage. Kensington's winters don't bring the extended sub-zero outages you'd see somewhere like Bozeman, MT, but Montgomery County does see occasional multi-day outages after ice storms and downed trees along Rock Creek Park. Valor fireplaces take a different approach: their pilot generates its own electricity through a thermocouple, so there's no battery to remember or replace. Ask your local dealer about the ignition system on any model you're considering.

A gas fireplace is a fully built-in unit framed into a wall—the right choice for new construction or a larger renovation. A gas insert is sized to slide into an existing masonry firebox, which describes a large share of Kensington's older housing stock, and uses the existing chimney as its vent path. A gas stove is a freestanding cast-iron or steel unit that sits on the floor like a wood stove but burns gas, useful in a room with no existing fireplace and no interest in framing a new one. For most Kensington homeowners with an original Victorian or Craftsman firebox, an insert is the simplest and most cost-effective upgrade.

Yes—a building permit and a gas line permit are required through the Montgomery County Department of Permitting Services, and the gas connection itself must be run by a licensed gas-fitter. If your home sits within the locally designated Kensington Historic District, exterior venting placement may also need review by the town's Historic District Commission before the county permit is finalized. A certified local hearth retailer will typically coordinate both steps rather than leaving you to manage separate trades and approvals.

Maryland permits vent-free (unvented) gas fireplaces under state mechanical code, but they come with strict room-size minimums and require an oxygen depletion sensor. Direct-vent units, which draw combustion air from outside and exhaust it back outside through a sealed system, are far more common in Kensington and are what most local installers recommend by default—especially in older homes where indoor air sealing can already be tighter than expected after energy retrofits. Ask your dealer to walk through both options if you're weighing a vent-free unit for a room without existing venting access.

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—a much lighter service than a wood chimney sweep, but just as important for safe operation. Local gas appliance technicians typically charge $175 to $275 for this visit in the DC metro area, and it's worth doing every year even if the fireplace sees light use.

A gas insert or fireplace delivers real, sustained heat output and typically costs less to run than electric resistance heat, which matters given Pepco's residential rate of roughly 18.7 cents per kWh—one of the higher rates homeowners in this region deal with. Electric fireplaces cost far less to install (often $400 to $1,500) and can go almost anywhere without venting or gas lines, which makes them a fit for a condo, a rental, or a room where running gas line isn't practical. For a primary heat source in an older Kensington home with an existing masonry fireplace, gas is usually the better long-term investment; for supplemental ambiance in a space without an existing chimney, electric is often the simpler answer.

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.

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.

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.

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.