Instant Heat for Demarest's Coldest Nights.

For a direct-vent gas insert going into an existing masonry fireplace with a gas line already nearby, expect somewhere in the $5,500 to $9,500 range in Bergen County, including a stainless steel liner sized to the new appliance. A full built-in gas fireplace for a remodel or an addition—with framing, venting, and a new gas line run from the meter—typically lands between $9,000 and $14,000 given regional labor rates this close to New York City. Homes without any nearby gas line, or projects that need a propane tank installed, run higher. A local dealer will give you a firm number after seeing the space.

Yes, and it's one of the most common projects in a town like Demarest, where a lot of the older Tudor and Colonial homes still have their original masonry hearths built for burning oak and hickory. A gas insert slides into that existing firebox, and a stainless liner runs up through the existing chimney to vent it—no new masonry work required. The look of the original fireplace stays intact, but you get real, controllable heat with no ash, no cord splitting, and no chimney draft pulling warm air out of the room when it's not lit.

Most homes in Demarest already have natural gas service for heating and cooking, so tying a fireplace into the existing line is usually the simpler and cheaper path. A smaller number of properties—particularly ones on the edges of town or homes that rely on oil or electric heat—don't have a gas main nearby, and propane is the standard fallback, either from an existing tank or a new one set by a local propane supplier. Nearly every gas fireplace and insert sold by local dealers can be configured for either fuel; it just changes the orifice and regulator setup.

Yes. New gas fireplace and insert installations require a construction permit under the New Jersey Uniform Construction Code, reviewed through the Demarest Borough Building Department, along with a separate permit for any gas line work performed by a licensed gas fitter. In practice, the hearth dealer or contractor doing your install typically pulls these permits and schedules the required inspections as part of the job, so you're not coordinating multiple trades and multiple borough visits yourself.

Most modern gas fireplaces will, which matters given how often storms roll through the Hudson Valley corridor and knock out power for a day or two at a time. Units with intermittent pilot ignition (IPI) run on a small battery backup that kicks in automatically when line power drops, so the fireplace still lights on demand. Valor's lineup goes a step further—their pilot assembly generates its own electricity through the thermocouple, so there's no battery to remember at all. Given that Rockland Electric and Orange & Rockland rates already run high here, having a heat source that doesn't depend on the grid is worth asking your dealer about.

Vented (direct-vent) gas fireplaces pull combustion air from outside and exhaust it back outside through sealed venting, which is why they're the standard choice almost everywhere, including here. Vent-free units burn directly into the room and are legal in New Jersey under strict room-sizing and oxygen-depletion-sensor rules, but given how many Demarest homes already have a working chimney flue from the original masonry fireplace, most homeowners end up going direct-vent anyway—it uses the venting path you already have and avoids any tradeoffs on indoor air quality.

It depends on the room and how the house is insulated, but for a typical Demarest living room or den in a 2,500 to 4,000 square foot Colonial, a mid-size insert or fireplace in the 20,000 to 35,000 BTU range is usually the right zone-heating fit—enough to make the room genuinely warm without overheating it. Larger open-concept additions or great rooms may call for something closer to 40,000 BTU. A local dealer will size the unit to your actual room during an in-home visit rather than guessing off square footage alone.

Plan on an annual inspection, ideally in early fall before the heating season starts. A technician checks the burner, pilot or ignition system, venting, and gas connections, and cleans the glass and interior—a much quicker job than a wood chimney sweep, but just as important for safety and for keeping the manufacturer's warranty intact. Local hearth and HVAC service providers in the area typically charge $150 to $250 for this visit.

Wood offers a real flame and the option to burn oak, hickory, or maple sourced locally, plus heat that doesn't depend on electricity or a gas line—genuinely useful during an extended outage. Gas offers instant on-off convenience, no ash or creosote, and steady, controllable output without ever splitting or stacking anything. Demarest doesn't carry the air-quality restrictions that limit wood burning in some parts of the country, so either option is workable here. In practice, most homeowners converting an old, rarely-used masonry fireplace choose gas for the daily-use living room, and some keep a secondary wood-burning setup elsewhere for backup heat or ambiance.

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 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.

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.

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.