Quick answer: There is no single US law that sets how far a wood stove chimney must be from a window or a neighbor. Codes are adopted locally, by the state, the county or the town. What applies almost everywhere is the 3-2-10 rule: the chimney top must be at least 3 feet above the highest point where it passes through the roof, and at least 2 feet higher than any part of a building within 10 feet, your neighbor's house included. For a Class A chimney, the manufacturer's installation instructions are the rule.
Is There a US Law on Chimney Distance to Windows?
Not at the national level. Most towns build their rules on the International Residential Code (IRC) and NFPA 211, often with local amendments. For a factory-built chimney, such as a Class A chimney, IRC Section R1005.1 says it must be listed, labeled, and installed and terminated according to the manufacturer's installation instructions. So the instructions that come with your chimney system, together with your local building department, decide what is allowed at your address.
For a wood stove chimney that rises above the roof, the code gives no fixed distance to a window. The height rule does the work: a chimney that clears every part of a building within 10 feet by 2 feet also clears the windows and dormers in that zone.
The 3-2-10 Rule and Your Neighbor's House
The rule counts every building within 10 feet of the chimney, not only your own. If your neighbor's house, a garage or a taller wing of your own home sits within 10 feet, the chimney top must be at least 2 feet higher than its highest point inside that 10 foot circle. Our guide on how high a chimney pipe must extend above the roof shows how to measure it.
| Situation | What the rule asks |
|---|---|
| Chimney through the roof | At least 3 ft above the highest point where it passes through the roof |
| Any building within 10 ft (yours or a neighbor's) | At least 2 ft higher than any part of it within 10 ft |
| Chimney up an outside wall | The same heights, measured from the roof edge it passes and the buildings around it |
| Property line | No national rule; ask your building department and, if you have one, your HOA |
Can a Wood Stove Chimney End at the Side of the House?
No. A wood stove chimney never ends in a wall next to a window. When the pipe leaves through a wall, it continues outside as insulated Class A chimney pipe, straight up the wall, until it meets the 3-2-10 rule above the roof. That is how our through-the-wall chimney kit is built. Only Class A chimney pipe passes through the wall, inside a wall thimble.
Pellet Stove Vents Are Different
Some pellet stoves are listed to vent sideways through a wall. For those, the stove's own manual sets the distances. Typical figures in pellet stove manuals are:
- at least 4 ft below or beside a door, an opening window or an air inlet, or 1 ft above it;
- at least 3 ft above a forced air inlet within 10 ft;
- at least 2 ft from an adjacent building;
- at least 7 ft above a public walkway.
Always follow the figures in the manual of the stove you install; they can differ from the list above.
Smoke, Neighbors and Local Burn Rules
Even a chimney that meets every height rule can send smoke toward a neighbor's window on a still day or with a downdraft. Your area may also restrict wood burning on days of poor air quality; your local air agency confirms the rules where you live.
Check Before You Order
Before you buy, ask your building department which code it has adopted and whether it needs a permit and an inspection. Then plan the chimney height with the 3-2-10 rule, counting every building within 10 feet. Not sure how many sections you need to clear your roof and your neighbor's house? Use our free flue design service, read about clearances to ceilings and walls, or compare our Class A chimney pipe and the through-the-roof chimney kit.
Questions about your situation? Call our chimney specialist at 888-834-0880, 9am to 9pm, 7 days a week.
FAQ
How far does a chimney have to be from a window?
For a wood stove chimney that rises above the roof, US codes set no fixed distance to a window. The chimney top must be at least 2 feet higher than any part of a building within 10 feet, which also clears the windows in that zone. Your chimney's installation instructions and your building department have the final word.
How close can my chimney be to my neighbor's house?
There is no national distance. If the neighbor's house is within 10 feet of the chimney, the chimney top must be at least 2 feet higher than any part of that house within 10 feet. Property line rules, where they exist, are local.
Can a wood stove vent sideways through a wall like a pellet stove?
No. A wood stove chimney passes through the wall as insulated Class A chimney pipe and then rises above the roof. Only appliances listed for side venting, such as some pellet stoves, may end at the wall, with the distances in their manual.
Who decides the rules for my chimney?
Your local building department, based on the code your state, county or town has adopted, usually the IRC with NFPA 211, and the installation instructions of your chimney system.
