How often should you have your chimney swept?

The standard reference is NFPA 211, which states: "Chimneys, fireplaces, and vents shall be inspected at least once a year for soundness, freedom from deposits, and correct clearances."

Inspection vs sweep — different things:

• Inspection (Level 1, 2, or 3): a visual + sometimes camera-based examination of the chimney. Takes 30-90 minutes. Required annually.
• Sweep: physical removal of creosote and debris. Required only when inspection finds buildup.

For a regular wood-burner (1+ fires per week during heating season), a sweep is typically needed annually. For occasional fireplace users (a few fires per year), every 2-3 years is more typical.

Why creosote matters:

Creosote is the tar-like residue from wood combustion. It accumulates on chimney walls and is highly flammable. Above 1/8 inch buildup, the risk of chimney fire (often catastrophic) becomes meaningful. Chimney fires don't usually result in dramatic flames coming out the top — most are confined inside the flue and damage the liner without anyone noticing until the next inspection. By then, the chimney needs major repair or relining.

What different fuel types need:

• Wood-burning fireplace: annual inspection + sweep as needed (typically annual for regular use)
• Gas log set in masonry chimney: annual inspection (gas burns clean — sweeping rarely needed but the chimney structure still needs checking)
• Pellet stove: annual inspection + sweep (pellets produce less creosote but more fly ash)
• Oil-fired heating with chimney venting: annual inspection + cleaning (oil produces sooty deposits)

The Level 2 inspection:

NFPA also defines a "Level 2" inspection that includes interior camera examination of the flue. It's required after: real-estate transactions involving the property, chimney fires, lightning strikes, system changes (like converting from wood to gas), and earthquakes. Level 2 inspections cost $200-$450 vs $65-$120 for Level 1.

Insurance implications:

Most homeowner insurance policies require documented annual chimney inspection if the home has a wood-burning system. A chimney fire claim with no inspection records is often denied. Keep the inspection invoice with date in your records.