Chimney cleaning: how often and why
Have your chimney checked once a year and cleaned when the check shows buildup. Every fire leaves creosote, a sticky black buildup that can catch fire. Call a sweep sooner if you smell smoke inside, fires burn poorly, or you see black flakes.
Your checklist
- Check it once a year
- Clean it when the check says so
- Watch for warning signs
- Ask to see photos
- Hire a certified, insured sweep
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Why it matters
Every fire leaves creosote, a black, sticky buildup inside the chimney. Too much of it can catch fire, and a chimney fire can spread to the house.
How often
National fire safety advice is to have the chimney checked once a year and cleaned when the check finds buildup or damage.
Warning signs
- A smoky smell inside
- Fires that burn poorly or smoke a lot
- Black flakes in the fireplace
- Birds or animals in the chimney
What a sweep does
They brush out the buildup, check for cracks and blockages, and many show you photos from inside.
Cost
A regular cleaning often costs a few hundred dollars, depending on your town and chimney. Ask for the price up front, and ask about certification and insurance.
Common questions
Does a gas fireplace need a sweep?
Gas fireplaces and furnaces still vent through a chimney or flue and should be checked, usually once a year.
Can I clean my chimney myself?
Some people do, but a pro also inspects for cracks and blockages you may not see.
Find a chimney sweep near you
Ask about certification and insurance.
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Not yet reviewed by an expert. Last checked 2026-10-29. This is general help, not legal, medical or professional advice. Rules are different in every state.