Most Brooklyn brownstones were built with a fireplace in nearly every room, and most of those fireplaces were made to burn coal. A century later many sit dark, drafty in winter and smoky on the rare night someone lights them. A direct vent gas insert or an electric firebox insert can bring that parlor mantel back into daily use without touching the marble around it.
The right choice depends less on taste than on what is behind the mantel: how deep the firebox is, what shape the flue is in, and whether the house sits in a historic district. Here is how we approach it.
The short answer
For a brownstone fireplace you want to use as a real heat source, a direct vent gas insert is the strongest option: it seals the firebox and vents through two new liners run up the old flue. A vented gas log set is simpler but needs a sound chimney and an open damper, and most of its heat goes up the flue. When the firebox is too shallow, the flue is unusable or there is no gas line, an electric firebox insert is the clean answer. Vent-free gas logs are not allowed in New York City. Gas work needs a DOB permit and a licensed master plumber, and in a historic district any work that needs a DOB permit also needs a Landmarks permit.
Key takeaways
- Coal-era fireboxes are often shallow and low, so measure depth and height before choosing anything.
- A direct vent insert brings its own liners, which also solves an unlined or cracked terra-cotta flue.
- Each gas appliance needs its own flue; it cannot share one with a fireplace that still burns wood.
- Landmarks review is about the exterior and DOB filings, so a chimney cap visible from the street matters.
- Local Law 154 and the state all-electric law cover new buildings, not a conversion in an existing brownstone.
In this guide
- Your three options at a glance
- What can you put in an existing brownstone fireplace?
- Why are brownstone fireplaces harder to convert?
- Do you need a Landmarks permit?
- What permits does the gas line need?
- Do Local Law 154 or Local Law 38 stop a conversion?
- Brownstone conversions in Brooklyn, Harlem and the Upper West Side
- Our recommended models
- Which should you choose?
- Frequently asked questions
Your three options at a glance
| Vented gas log set | Direct vent gas insert | Electric firebox insert | |
|---|---|---|---|
| Best for | The look of an open fire | Real, controllable heat | Shallow fireboxes, no gas, no usable flue |
| Chimney | Must be sound; damper stays open | Two liners run the full height | None; damper closed and sealed |
| Heat in the room | Low; most heat goes up the flue | High; sealed glass and a blower | Supplemental, about 1,500 W on 120 V |
| Permits | DOB gas permit, licensed master plumber | DOB gas permit, licensed master plumber | Usually none for plug-in; electrician for hardwired |
| Landmarks exposure | DOB filing triggers LPC review | DOB filing plus a new cap on the roof | Typically none |
What can you put in an existing brownstone fireplace?
A vented gas log set
A vented gas log set is a burner and ceramic logs that sit in the open firebox. It looks the most like a wood fire, with tall, lazy yellow flames, and it is the least invasive install. The tradeoff is that it vents exactly like a wood fire. The damper is fixed open, the chimney has to draw properly, and most of the heat leaves with the exhaust. Treat it as atmosphere, not heat. Our gas log set buying guide covers burners, sizing and media in detail.
New York State also requires vented log sets made since June 26, 2023 to shut off the pilot when the main burner goes out, so buy current, certified product rather than an old set from the cellar.
A direct vent gas insert
A direct vent insert is a sealed steel firebox with ceramic glass that slides into the masonry opening. Two flexible liners run up the old flue to a new termination cap: one brings outside air to the burner, the other carries exhaust out. Many systems use a pair of 3 inch liners, such as the Majestic LINK-DV30B kit. The fire never draws room air, so the parlor stops losing warm air up the chimney. It is the most efficient way to use an old fireplace.
An electric firebox insert
An electric insert or electric log set needs no gas line, no liner and no roof work. Units like the Napoleon Rosedale 3 electric insert plug into a 120 V circuit, add modest heat and leave the chimney untouched, with the damper closed and the opening sealed against drafts and debris.
What about vent-free gas logs? They cannot be installed in New York City. The NYC Fuel Gas Code does not allow unvented gas logs, fireplaces or room heaters, however they are marketed online.
Why are brownstone fireplaces harder to convert?
Shallow coal-burning fireboxes
Coal burned in a small basket, so 19th century rowhouse fireboxes were built narrow, low and shallow. Brooklyn owners commonly report parlor fireboxes around 15 inches deep. That matters, because every insert and log set has a minimum opening. The Majestic Ruby 25 needs 15 inches of depth and just over 17 inches of front height with its standard surround. The Kingsman IDV26 needs 14 1/4 inches deep and 19 1/2 inches high. The Rosedale electric insert needs only 12 1/2 inches of depth. Our guide on how to measure a fireplace opening covers all four measurements.
Narrow, unlined or cracked flues
Many brownstone flues are small brick channels, some with old terra-cotta liners and some with none, and they rarely run straight. A century of coal acid and settling leaves cracks and missing mortar. A vented log set depends on that flue being sound. A direct vent insert does not, because its own listed liners become the vent, but they still have to fit through the narrowest offset in the chimney.
From our install team
On rowhouse work, the tight bend behind the smoke chamber is usually what decides the project, not the firebox. We scope the flue first, then pick the insert, never the other way around.
A shared chimney stack
A brownstone chimney stack usually carries several flues: one for each fireplace on each floor, and often one for the boiler. In some rows the stack straddles the party wall and carries a neighbor's flues as well, so roof access and cap work can involve the house next door. The rule that matters is simple: a gas insert must not share a flue with a solid-fuel appliance. The Kingsman manual says so directly. If you keep burning wood in the front parlor and convert the back one, the inspection has to confirm which flue serves which hearth.
Chimney relining
Relining means running a new, listed liner inside the old flue. For a direct vent insert it is part of the system: the liners run from the insert to the top of the chimney, often with a minimum vertical run (the Ruby requires at least 10 feet), and the space between the masonry and the liner is capped. For a vented log set, a deteriorated flue may need relining before it is safe to use.
Do you need a Landmarks permit to convert a fireplace in a historic district?
Often, yes, even though most of the work happens inside. The Landmarks Preservation Commission lists interior projects that require a Department of Buildings permit among the work that needs an LPC permit. Because gas piping needs a DOB permit, a gas conversion in a landmarked brownstone typically needs an LPC permit as well, usually a staff-level Certificate of No Effect when nothing visible changes.
The roof is where the exterior question comes in. LPC's rowhouse guidance lists replacing, repointing or altering chimneys as work that needs a permit, and its rules on rooftop mechanical equipment let staff approve installations that are not visible, or only minimally visible, from a public thoroughfare. A new termination cap on a stack visible from the street should be shown in the application, and LPC may ask for a mock-up. Confirm with LPC (212-669-7817) before you schedule the work. An electric insert with no DOB filing and nothing on the roof usually stays outside all of this.
What permits does the gas line need?
New York City requires a DOB permit to install, alter or convert a gas system, and gas piping is excluded from the minor-alteration exemption. The work must be done by a licensed master plumber or under one's direct supervision. A new branch from the cellar meter to the parlor floor is routine for an LMP, but it is still permitted work with inspections and a gas sign-off before the appliance is lit, so budget calendar time for it. The installer also follows the manual's mantel clearances, which matter around painted wood surrounds.
Not sure what fits your space? Send us photos of the firebox, its measurements and a picture of the roof stack, and we will tell you which of the three options is realistic. Book a free design consultation and we will help you narrow it down.
Do Local Law 154 or Local Law 38 stop a conversion?
No. Local Law 154 limits fossil-fuel combustion in new buildings. DOB applies it to new building filings, including alterations that must be filed as new buildings, not to ordinary work in an existing house. A gas insert in an existing brownstone is outside it. New York State's All-Electric Buildings Act also covers new buildings and expressly excludes existing ones, so it does not affect a conversion either.
Wood is a separate question. Local Law 38 of 2015 ended new wood-burning fireplaces in the city, but existing ones may still be used, with treated firewood at 20 percent moisture or less. Converting is a choice, not an obligation.
Brownstone conversions in Park Slope, Brooklyn Heights, Fort Greene, Bed-Stuy, Carroll Gardens, Clinton Hill, Harlem and the Upper West Side
These neighborhoods share the same housing stock: masonry rowhouses with marble mantels, coal-era fireboxes and tall shared stacks. Much of each sits inside a designated historic district, including the Park Slope, Brooklyn Heights, Fort Greene, Carroll Gardens and Clinton Hill historic districts, Stuyvesant Heights in Bed-Stuy, Mount Morris Park in Harlem, and the Upper West Side/Central Park West and Riverside-West End districts in Manhattan. Not every block is landmarked, so check the address on LPC's map before you plan around it.
Many brownstones have also been split into condos or co-ops. In that case the chimney and roof are usually common elements, and house rules can be stricter than city code, so board approval comes before the permit. Our guide to co-op board approval for a fireplace covers what boards ask for.
From our install team
Rowhouse roofs are flat and accessed through a hatch, so we plan the liner pull from the top and protect the stair and parlor floors before anything comes down the flue.
Our recommended models
We picked these for small, shallow masonry openings, which is what most brownstones have. Our best gas fireplace inserts guide covers larger sizes.
Gas inserts All fireplace inserts Gas log sets Electric firebox inserts Majestic Napoleon fireplaces
Which should you choose?
Choose a direct vent insert if:
- You want the fireplace to warm the room on a January evening.
- The flue is unlined or cracked and needs relining anyway.
- The firebox meets the insert's minimum depth and height.
Choose a vented log set if:
- The chimney is sound and already drafts well.
- You want the most natural, open flame and little roof work.
- Heat is not the point.
Choose an electric insert if:
- The firebox is too shallow or low for gas.
- There is no gas near the room, or the board will not allow it.
- You want to avoid DOB and Landmarks filings entirely.
For a parlor fireplace you will use every week, we recommend a direct vent insert: it is the only option that is efficient, sealed and genuinely warm. For upper-floor bedroom fireplaces and very shallow coal fireboxes, electric is the better result. Choose a vented log set only when the chimney is in good order and the fire is mainly for looks.
Frequently asked questions
Can you convert a coal-burning fireplace to gas?
Often, yes. The limits are the firebox's depth and height and whether two liners fit up the flue. If the firebox is too small for gas, an electric insert usually still fits.
Do I need a Landmarks permit to install a gas insert in a brownstone?
If the house is in a historic district, usually yes. LPC requires a permit for interior work that needs a DOB permit, and gas piping needs one. A visible new chimney cap is reviewed as exterior work. Confirm with LPC before scheduling.
Are vent-free gas logs legal in NYC?
No. The New York City Fuel Gas Code does not allow unvented gas logs, fireplaces or room heaters. Use a vented log set, a direct vent insert or an electric insert instead.
Does Local Law 154 ban gas fireplaces in existing brownstones?
No. Local Law 154 applies to new building filings, not to work in an existing house, and the state All-Electric Buildings Act excludes existing buildings. A gas conversion in an existing brownstone is outside both.
Can I still burn wood in my brownstone fireplace?
Yes, if it is an existing fireplace. Local Law 38 of 2015 stopped new wood-burning fireplaces, and existing ones must burn treated firewood at 20 percent moisture or less. A gas insert cannot share a flue with a fireplace that still burns wood.
Talk to a specialist
Bring your brownstone fireplace back into use
We have been designing, selling, installing and servicing fire features and outdoor kitchens for over 30 years across New York City, Long Island, Westchester, New Jersey and South Florida. Send us your firebox measurements and a photo of the mantel, and we will recommend the option that suits the house.
Book a free consultation Call 718-326-4328Showroom: 58-30 Maspeth Ave, Maspeth, Queens. Our Greenvale, Long Island showroom at 13 Glen Cove Road opens winter 2026. Plan your visit.
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Written by the NYC Fireplaces & Outdoor Kitchens team. Last reviewed October 2026. We sell, install and service the products discussed here.
Sources: LPC Permit Guidebook: Introduction, LPC Permit Guidebook: HVAC and Mechanical Equipment, LPC Rowhouse Manual, NYC Administrative Code, NYC DOB 2022 Construction Codes, NYC DOB Local Law 154, Local Law 38 of 2015, NY Energy Law 11-104, NYSERDA gas fireplace standards, Majestic Ruby installation manual, Napoleon Oakville X3. Specifications change; always confirm with the manufacturer's current installation manual.