Chimney sweep: what the service includes, what it costs, how often
Updated · Every figure checked twice against its source · How we verify
A chimney sweep cleans soot and creosote out of the chimney and firebox and checks the system for damage. HomeGuide puts a typical sweep of a masonry chimney at $150 to $375, with a national average of $275, and the NFPA says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional. Book before the cold months: in fire department records for 2020 to 2024, 57.4% of chimney fires happened in December, January and February.
The short version
Cost: $150 to $375 for a masonry chimney, $80 to $150 for a gas fireplace (HomeGuide).
How often: once a year, before the heating season (NFPA).
Time: 1 to 2 hours on average (HomeGuide).
Why: creosote, the residue wood smoke leaves in the flue, "is highly combustible" (Chimney Safety Institute of America).
What does a chimney sweep do?
For a masonry chimney with a wood-burning fireplace, HomeGuide says the work includes cleaning out the firebox and smoke shelf and vacuuming up the debris. The sweep brushes the flue to remove soot and creosote and looks the system over for cracks and damage; HomeGuide says a basic inspection with cleaning takes 45 to 60 minutes. The Chimney Safety Institute of America (CSIA) recommends having chimneys checked every year by a CSIA Certified Chimney Sweep and swept or repaired as needed. To do the brushing yourself between inspections, see how to clean a chimney yourself, and for chemical sweeping logs, do creosote logs work.
What gets swept
HomeGuide price
Masonry chimney, wood-burning fireplace
$150 to $375
Gas fireplace
$80 to $150
Prefabricated chimney
$90 to $175
Wood or pellet stove
$130 to $300
HomeGuide, chimney sweep cost, page dated February 9, 2026. Full breakdown in the chimney sweep cost guide.
How often should you sweep your chimney?
Once a year. The NFPA's heating safety tip sheet says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional, and NFPA's heating safety page says chimneys and heating systems should be inspected and cleaned each year before they are fired up for the season. Portland Fire & Rescue gives the same advice: have the chimney inspected before every heating season and cleaned if necessary. An inspection finds whether cleaning or repair is needed; see chimney inspection levels and costs. The full schedule by appliance, including gas, wood stoves and factory-built fireplaces, is in how often should a chimney be swept.
When chimney fires happen
Share of chimney fire records by month, residential structures, NFIRS 2020 to 2024. Source: our analysis of FEMA NFIRS records.
Chimney fires confined to the chimney or flue made up 3.4% of residential structure fires in fire department records for 2020 to 2024, and they are heavily seasonal: January alone accounts for 21.9% and the three winter months for 57.4%, against 0.6% each in July and August. NFPA's national estimates for 2020 to 2024 point the same way: nearly half of home heating equipment fires (46%) happened from December through February.
Where you live matters more. In Vermont, chimney fires were 19.5% of residential structure fire records, in Maine 17.3% and in New Hampshire 16.2%; in Texas they were 1.4% and in Florida 0.6%. The share fell from 3.8% in 2020 to 2.9% in 2024. State-by-state figures: chimney-fires-by-state.csv. What to do during a chimney fire, and its signs, are in chimney fire.
Do you need a chimney sweep for a gas fireplace?
Yes, once a year: the NFPA's annual cleaning and inspection advice covers heating equipment and chimneys, not only wood fireplaces. The job is cheaper. HomeGuide prices a gas fireplace cleaning at $80 to $150 and says gas tends to burn cleaner with less residue than wood.
Why it matters
CSIA describes creosote as the black or brown residue wood smoke leaves in the flue, sometimes crusty and flaky, sometimes tar-like or shiny and hardened, and says that if it builds up enough and the flue gets hot enough, the result can be a chimney fire. NFPA's 2020 to 2024 estimates put home heating equipment fires at 37,365 a year; the larger fires involving fireplaces or chimneys were 6% of those but caused 19% of the direct property damage. A slow-burning chimney fire can go unnoticed until a later inspection, CSIA says, while still reaching temperatures that damage the chimney.
How to pick a chimney sweep
Ask whether the sweep is CSIA certified. CSIA keeps a searchable list of certified sweeps by ZIP code.
Ask what the price includes: the firebox, smoke shelf and flue, and a Level 1 inspection.
Ask for photos of anything the sweep says needs repair, before you agree to the repair.
A chimney sweep is the professional who cleans soot and creosote out of chimneys, fireplaces and stove vents and checks them for damage. The same word is used for the service itself. CSIA certifies sweeps and lists certified sweeps by ZIP code.
How long does a chimney sweep take?
1 to 2 hours on average, according to HomeGuide, or less for a cleaning and visual check on a well-maintained chimney. HomeGuide says a chimney that has not been cleaned in more than a year, or one with major damage to investigate, can take twice as long.
How often chimney sweep
Once a year, before the heating season. The NFPA says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional.
How do I know if my chimney needs cleaning?
Go by the calendar first: if it has been a year, it is due, per the NFPA. CSIA lists signs that a chimney fire has already happened, such as puffy or honeycombed creosote and creosote flakes found on the roof or ground; if you see those, stop using the fireplace and have it inspected.
Do gas fireplaces need chimney sweep?
Yes, on the same yearly schedule: the NFPA's advice covers heating equipment and chimneys. HomeGuide prices gas fireplace cleaning at $80 to $150.
Sources
NFPA, Heating safety (2020 to 2024 statistics): nfpa.org
All sources read September 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).