The quick answer
As a rule of thumb, HETAS and most insurers suggest:
- Wood: up to twice a year when the stove is in regular use.
- Smokeless fuel: at least once a year.
- Gas or oil: once a year.
- Chimneys not used for a while: before the first fire.
Signs your chimney is overdue
Book a sweep sooner if you notice any of these:
- Smoke coming back into the room.
- A strong tar smell, especially on damp days.
- Black glass that will not clear on a hot burn.
- Twigs or debris in the stove or fireplace.
- Crackling or roaring sounds from the flue.
The best time to book
Spring and summer are quiet for sweeps, so it is easier to get a slot. Sweeping at the end of the season also stops soot sitting in the flue through damp summer months. Then a second sweep mid-winter if you burn a lot of wood.
Why the certificate matters
Our HETAS sweep certificate records the date, the method used and anything we noticed. Some home insurers ask for proof of sweeping after a chimney fire, so keep it safe.
