Chimneys should typically be cleaned at least once a year to ensure safety and proper function. However, the frequency depends on how often you use your fireplace. If you use it regularly, especially with wood-burning stoves or fireplaces, more frequent cleanings might be necessary. The National Fire Protection Association (NFPA) recommends an annual inspection, even if the chimney isn’t heavily used, to check for blockages, creosote buildup, or any structural damage that might require cleaning or repairs.

If you burn wood frequently, consider a cleaning after every cord of wood to prevent excessive creosote buildup, which can lead to chimney fires. For gas or oil-fueled chimneys, an annual check is still recommended, though these typically produce less soot and creosote than wood-burning fireplaces.

Failing to clean your chimney regularly can result in creosote buildup, which is highly flammable and a leading cause of chimney fires. Blockages from debris, animal nests, or soot can also lead to poor ventilation, causing carbon monoxide to enter your home. Over time, this can damage the chimney structure, leading to costly repairs.

While some basic cleaning tasks like removing ash and soot from the fireplace can be done by homeowners, it's recommended to hire a professional chimney sweep for thorough cleaning and inspection. Professionals have the tools and expertise to check for creosote buildup, blockages, and any structural issues that may not be visible or easily accessible to a homeowner.