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The Global Insight

Can you add a second fireplace to an existing chimney

Author

Mia Horton

Updated on March 31, 2026

Fireplaces on multiple levels can also share one chimney structure. … Each fireplace can face the same direction, if you want, since they will not block each other. You might even choose to combine a multi-level fireplace with a double sided fireplace, combining three fireplaces into one chimney.

Can you install a fireplace into an existing chimney?

Yes, you can easily add a gas fireplace insert into your existing chimney. In fact, a fireplace insert is an appliance designed to fit into an existing fireplace. Inserts are usually cut in various sizes to suit your preferences and needs.

Can a fireplace share a chimney flue?

Fireplaces can’t share the same flue but can be run in the same chimney with their own flue liners. … It got that way as the fireplace sucked air from the interior of the house for combustion air for the fire and pulled heated air from the rooms to assist the draft of the flue gasses up and out the chimney.

How much does it cost to add a fireplace to an existing chimney?

Fireplace TypeCost To InstallElectric Fireplace$100 – $2,200Wood-Burning Fireplace$1,900 – $3,300Gas Fireplace$2,300 – $4,000Masonry Fireplace$3,500 – $5,600

Does each fireplace have its own chimney?

As fires burn they give out combustion gases which are carried out of the home by a flue. Standard brick chimney flues are 9″ squared. Each fireplace will have it’s own separate flue which is divided by the mid feathers.

Can you vent gas fireplace into chimney?

A gas stove can be vented through an existing chimney, whether it is a manufactured or masonry chimney. To ensure proper venting, however, a liner must first be installed in the chimney. … In a B-vent system, a substantial amount of heat is lost through the chimney.

What has a chimney but no fireplace?

In many cases, houses that seem like they don’t have fireplaces actually do, they were just covered up. Chimneys are most common in houses built before 1900 when older furnaces needed chimneys to remove fumes from the house. As steam, gas, and electric heating became more popular, fireplaces were no longer necessary.

How much is a chimney cap?

Chimney Cap Installation Cost Installing a chimney cap costs $300 on average, ranging from $75 to $1,000. The cap runs $35 to $550 depending on material and size. In most cases, you’ll pay $100 to $200 for installation. Without a chimney cap, all you have at the top of the flue is an open hole.

Can you put a fireplace in a house that doesn't have one?

You definitely can add a new fireplace to a home that has never had one.

Can you add a fireplace to a house?

Be assured that it is possible to add a fireplace to an existing home. You’ll just need to determine which one will work best. … Fireplaces generally fall into one of three categories: gas, masonry, and zero-clearance (also known as prefabricated or manufactured fireplaces).

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How many fireplaces can you have in one chimney?

Watch out: Although two openings are permitted into a single chimney flue; NO combination of solid fuel-fired appliances are permitted to be vented into an oil-fired or gas-fired flue.

Who is responsible for shared chimney?

The whole of a shared stack can only be removed if both owners are in agreement – if it is on account of defect the cost will generally be split but if it is being done as part of improvement works to one property the owner benefitting from those works will generally carry the cost.

How close can two chimneys be?

Reply: no code, but we recommend 6″ or more vertical separation distance between adjacent flues. Horizontal flue spacing: Even in a multi flue masonry chimney you don’t run two flues through the same physical opening. Adjacent flues require horizontal separation.

Can you put two fireplaces one chimney?

Fireplaces on multiple levels can also share one chimney structure. … Each fireplace can face the same direction, if you want, since they will not block each other. You might even choose to combine a multi-level fireplace with a double sided fireplace, combining three fireplaces into one chimney.

How many appliances does a chimney need?

Remember, only one appliance per flue! The liner for the woodstove has to be properly sized, which generally means the same size as the collar-size coming from the appliance. Make sure the chimney is clear of combustible materials before inserting the smaller liner.

Why do I have two chimneys?

A flue is a venting system, each system needs its own so If you heat your home with oil or gas and have a fireplace you would have two flues. Often times they are in one chimney so if you were to look down the chimney it would be separated into two venting system inside one chimney.

Why do new houses have fake chimneys?

Traditionally, chimneys were difficult and expensive to construct, but new technologies can help you comply with planning criteria whilst saving on labour and expense. … Chimney breasts cut into a large amount of space in a room, which makes a prefabricated chimney the perfect choice for smaller builds.

Can you remove a fireplace but not the chimney?

It is possible to remove the fireplace by itself and leave the stack or chimney flue. The most important aspect of this kind of removal is reinforcement. A lot of supports will need to be installed in order to maintain the structural integrity of your house.

Why do old houses have two chimneys?

In these houses, cooking was often done on one side and heating (with a coal burner or gas heater) done on the other, with both components plugged into a double-barreled brick chimney stack.

Does a gas fireplace need a chimney liner?

Homeowners with gas or electric inserts most likely do not need a new liner because those types of fuel don’t produce enough heat to damage a masonry chimney.

Can I use a direct vent fireplace with a chimney?

Using a Direct Vent Gas Fireplace does not require an existing masonry chimney or brick fireplace and require very little pipe for installation. Direct Vent Fireplaces can be vented horizontally through an outside wall or vertically through the roof and will minimize heat loss through the chimney.

How much does it cost to build a brick fireplace and chimney?

Brick Fireplace Average Costs The average fireplace installation cost is $2,500 to $5,000, although an authentic brick fireplace constructed by a mason could cost up to $10,000 or more. Installing a prefabricated brick fireplace costs $2,000 to $3,000. A mason-built brick fireplace costs $3,500 to $5,000.

What is a ventless fireplace?

Natural Vent gas fireplaces (B-Vent) use air from within the home for combustion and release emissions outside the home. Ventless fireplaces use air from within the home and release emissions within the home – resulting in poor air quality and potential health risks.

Can you add a brick fireplace to a house?

Masonry Fireplaces A masonry fireplace consists of a brick or stone firebox, a brick or stone chimney, and, more often than not, a wood mantel. It’s a lot easier learning how to build a fireplace like this in new construction. Adding one to an existing home presents myriad challenges, but it certainly can be done.

Where does rainwater go in a chimney?

Unless a chimney has a cowling, rain often comes down its relatively small aperture. But all chimneys have a bend built into them to prevent any downdraught. Any normal rain will be absorbed by the insides of the chimney and prevented from going all the way down by this ledge.

What is the cap on a chimney called?

A chimney crown, also known as a chimney wash, is a slab of cement that covers the top of the chimney. While the chimney cap covers the opening of the flue, the crown covers the whole top of the chimney. The crown prevents water from entering the chimney.

What is chimney flashing?

Chimney flashing is a type of roof flashing that creates a waterproof seal to protect your chimney and roof from water damage and penetration. … Step flashing is an L-shaped piece of metal that lies under the roofing shingles and along the brick of your masonry chimney.

What is the fireplace in a house called?

The part of the fireplace that holds the fire is called a firebox or a firepit. There is a chimney or flue above the firebox that lets the smoke from the fire go outside. Until the early 1900s, most homes had one or more fireplaces as a source of heat for the residents of the house.

Can you install a fireplace on an interior wall?

It’s possible to install a wood-burning fireplace on an interior wall, but it’s usually not advised because wood-burning fireplaces need proper ventilation to draw outside air to feed the fire and get rid of the combustion exhaust.

Can you build a house with a wood-burning fireplace?

Effective November 1, 2016, new building construction may no longer include the installation of wood-burning devices, including fireplaces, EPA certified wood stoves or inserts, or pellet-fueled devices.

What is a double fireplace?

Double-sided fireplaces require double the space—and offer double the warmth. Often contemporary in style, a grand double-sided fireplace works best in open-concept areas and indoor / outdoor rooms, in which it creates multiple, aesthetically cohesive spaces connected through the fireplace wall.