Real Heat, Right Here in Brentwood.

Most gas fireplace and insert installations in the Brentwood area run $4,000 to $10,000, depending on the unit, the venting path, and whether new gas line work is needed. A direct-vent insert dropped into an existing masonry fireplace with a gas line already run to that wall sits toward the lower end. A new built-in gas fireplace in a remodel—with framing, venting through an exterior wall, and a fresh gas line tap off the National Grid main—runs toward the higher end. Homes needing a propane tank instead of natural gas service, or longer gas line runs from the street, can push above that range. A local hearth dealer will give you a firm number after seeing the space.

Yes, and it's one of the most common gas projects in Brentwood's older housing stock. A lot of the capes and colonials built here in the 1950s and 60s came with a wood-burning masonry fireplace that rarely gets used—installing a direct-vent or vented gas insert converts that into a real, everyday heat source without touching the original brick surround. Expect roughly $4,000 to $8,500 depending on the insert and whether the chimney needs a stainless liner. Since National Grid gas service already reaches most homes in the 11717 zip code, the gas line portion of the job is usually simple.

Either works, but natural gas is by far the more common choice in Brentwood. National Grid's distribution network covers most of the Town of Islip, and if your home already has a gas furnace, range, or water heater, adding a fireplace just means tapping into that existing line. Propane is really only the fallback for the small number of homes outside the gas main, and it requires either an existing tank or a new tank installed by a local propane supplier. Most fireplace models can be configured for either fuel—your installer sets the correct orifice and regulator.

It can, and on Long Island that matters. LIPA's grid has had real outage stretches during nor'easters and storms like Sandy and Isaias, sometimes lasting days. Gas fireplaces with IPI (intermittent pilot ignition) run on battery backup—typically AA batteries built into the unit—so they'll still light and heat the room even with the power out, as long as the batteries are fresh. Valor units go a step further: their pilot generates its own electricity through a thermocouple, so there's no battery to remember at all. Worth asking about when you're comparing models with a local dealer.

A gas fireplace is a fully built-in unit framed into a wall—the right call for new construction or a remodel without an existing hearth. A gas insert is sized to slide into an existing masonry fireplace opening and uses the chimney as its vent path—this is the more common project in Brentwood's older housing, since so many homes already have a fireplace opening that's barely used. A gas stove is a freestanding cast-iron or steel unit that sits on the floor like a wood stove but runs on gas, useful in a room without an existing fireplace or chimney. Most Brentwood homeowners with an old fireplace end up choosing an insert.

Yes—a building permit and a gas line permit through the Town of Islip are both required for a new gas fireplace or insert installation, and the gas line connection has to be done by a licensed plumber or gas fitter. Most established hearth dealers in Suffolk County coordinate all of this as part of the install, including scheduling the final inspection, so you're not left managing separate trades yourself.

Vented (direct-vent) units draw combustion air from outside and exhaust the byproducts back outside through a sealed pipe—they're the standard, most efficient, and most universally code-compliant choice. Vent-free units burn gas directly into the room air with no external venting; New York permits them in limited applications, but they come with strict room-size minimums, an oxygen depletion sensor, and restrictions on use in bedrooms. Given how tight lot lines and small rooms can be in Brentwood's older housing stock, most local installers steer homeowners toward direct-vent units, which sidestep the ventilation math entirely.

Plan on an annual inspection, ideally in early fall before the heating season ramps up. A technician checks the burner, pilot assembly, venting, and gas connections, and cleans the glass and interior. It's a lighter lift than chimney sweeping for a wood-burning unit but just as important for safe operation—expect to pay somewhere in the $150 to $250 range for a standard annual visit from a local service provider.

Electric fireplaces are cheaper to install (often under $1,500) and need no venting or gas line at all, but they're expensive to run as real heat given LIPA's residential electric rate, which runs as high as $0.38 per kWh—one of the highest in the country. Gas fireplaces cost more upfront but deliver far more heat per dollar once National Grid service is already at the house, which is the case for most of Brentwood. For a secondary accent unit in a room that doesn't need much heat, electric can make sense. For anything meant to genuinely warm a room through a Long Island winter, gas is the more common and more cost-effective choice locally.

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—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.

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.

Ideally, yes. A fireplace project involves vent pipe, gas line, electrical, and often tile or stone. Hire three or four separate trades and you own the liability and the game of telephone between them. One company selling and installing means one accountable party, start to finish—ask about factory training, on-time completion records, and what happens if an inspection fails.