What is the wood stove clearance to combustibles?
A wood stove's clearance comes from its own data plate, not one number; the default without a listing is usually 36 inches. Ask an installer.
Updated · By 
Ben Sikes
How far should combustibles be from a wood stove?
A wood stove's clearance to combustibles is printed on its own label. A certified stove carries a label on the back showing how much clearance it needs from walls and furniture. With no label, Purdue Extension's default for a common radiant stove is 36 inches from a combustible wall. If your inspector flagged it, have a certified chimney sweep or stove installer read the label and measure before your deadline.
Key takeaways
- The stovepipe has its own gap: 18 inches from the nearest combustible by default for single-wall pipe with no listing (National Fire Protection Association (NFPA), via Purdue). Listed pipe follows its own label.
- A listed, wall-mounted shield can shrink the gap. Brick on the wall does not count by itself.
- Masonry fireplaces run tighter than stoves. Illinois' code allows 2 inches at the front and 6 for a combustible mantel.
What does a clearance finding on my report mean?
A clearance finding means the inspector saw a stove, stovepipe or fireplace closer to something that can burn than it should be. Drywall over wood framing counts as combustible. So do nearby firewood, curtains and furniture.
The label comes first. The 2024 residential code, section M1306.1, ties appliance clearances to the label and the maker's installation instructions. The defaults below come from Purdue's table, taken from a 1976 NFPA standard. They apply only when no label covers the stove.
| Part | Default gap with no wall protection |
|---|---|
| Radiant stove, from a combustible wall | 36 inches |
| Circulating stove, from a combustible wall | 12 inches |
| Stovepipe | 18 inches |
Kept prices every line of an inspection report for $79, usually under 4 hours, and marks the ones that need a professional quote.
Purdue keeps firewood, paper, curtains and plastics as far from the stove as the radiant-stove wall gap in the table. The floor needs protection too, unless it is concrete. Purdue has it extend 12 inches past the sides and further on the door side. Your town's adopted code may differ, and the local building department answers for your address.
How serious is a wood stove too close to a wall?
Serious enough to have a professional check the gap before you close. Purdue Extension's guide says: "Most fires are caused when combustibles are too close to a hot stove." Cracked chimneys, heat conducted from the pipe, and escaping sparks make up the rest of its list. Heating fires were the second leading cause of home fires in 2021, according to the U.S. Fire Administration.
What clearance to combustibles does a wood-burning fireplace need?
A masonry fireplace uses smaller numbers, because the masonry itself is the barrier. Illinois' 2021 building code is one example (§2111.12):
- 2 inches from the front and sides, 4 inches from the back.
- A combustible mantel or trim stays 6 inches from the fireplace opening.
- Combustible trim at the sidewalls stays 12 inches from the inside face of the firebox lining.
A masonry fireplace "listed and labeled for use in contact with combustibles in accordance with UL 127 and installed in accordance with the manufacturer's instructions" can have combustible material touching its exterior. A factory-built fireplace, often called zero-clearance, skips these numbers and follows its own label. InterNACHI (International Association of Certified Home Inspectors) says that in general ½ inch around the firebox enclosure and 2 inches around the chimney are required, and that "different manufacturers may have different suggested clearances."
What does it cost to fix a clearance problem?
The cost to fix a clearance problem depends on the fix. Moving furniture or firewood costs nothing. Adding a listed wall shield is next. Wood Stove Hub, a stove buying guide, prices pre-built panels at $150 to $400 depending on size, for the panel alone. Moving the stove or rerouting the pipe is a bigger job, and only an installer's written quote prices it.
Not everything on the wall is a shield. Listed shields carry a label with their clearance reduction details, and Wood Heat says shields must be permanently mounted, not free-standing folding panels. Brick or stone alone gives little or no protection, Purdue says, because both conduct heat. Ask the installer to name the product and the new clearance in writing.
Who checks the clearance, and what do I ask the seller for?
Call a CSIA Certified Chimney Sweep (Chimney Safety Institute of America) or a stove installer first. Ask them to read the label, measure each gap, and put the fix in writing. Ask the seller for the stove's installation manual too, since the clearances are printed there as well. How to get repair estimates during the inspection period covers booking that visit fast.
Then ask for one of these:
- The fix before closing, done by that professional, with a written note of the new clearance.
- A credit equal to the installer's written quote, so you hire your own.
What to ask for after a home inspection shows how this line sits next to the rest of your list. The buyer repair request letter template gives you the wording. Your contract sets the deadline, so confirm the date with your agent.
What if the seller says no?
If the seller says no, keep the professional's written finding and weigh the installer's quote against the rest of your list. When to walk away after a home inspection covers how to decide. For how it compares to other heating items, see heating and cooling findings on an inspection report.
What is the 3-2-10 rule for chimneys?
It is a chimney height rule. InterNACHI puts it as at least 2 feet above any part of the roof within 10 feet, and at least 3 feet tall on its shortest side. Both parts apply. Ask the sweep to measure both on the same visit and tell you which point the 3 feet runs from.
Can a stovepipe be smaller than the stove's outlet?
Not by Purdue's guidance, which says the stovepipe must be the same diameter as the firebox outlet. So an 8-inch outlet stepping down to 6-inch pipe, or a 4-inch pipe on a larger outlet, does not meet it. If your report notes a size change, have the sweep check it against the stove's manual.
How do I know what the rest of my list is worth?
The rest of your list is worth what each line costs to fix, and this clearance fix is one line among them. Upload your inspection report to Kept and spend your remaining days on the lines that need a professional's figure.
Sources
- Purdue University Cooperative Extension Service, Residential Wood Stove Installation (FNR-100)
- Residential Code 2024 §M1306.1, Appliance Clearance, via UpCodes
- Illinois Building Code 2021 §2111.12, Fireplace Clearance
- U.S. Fire Administration, Heating Fire Safety
- InterNACHI, Factory-Built Fireplaces
- InterNACHI, Roof Penetrations
- Wood Heat, Installation Clearances for Wood Stoves
- Wood Stove Hub, Wood Stove Heat Shield
- Chimney Safety Institute of America, Why Hire a CSIA Professional
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