Chimney sweeping: how often, and do you have to?

A clean chimney before the first fire of winter.

The answer in 2 lines. In England, homeowners are not generally required by law to have their chimney swept, but fire services, HETAS and the National Association of Chimney Sweeps all advise it: at least once a year for smokeless fuel, oil and gas flues, and more often for wood and house coal (up to every three months when in use). Your home insurer may also expect a regularly swept chimney. Use a registered sweep, keep the certificate, and burn only dry wood.

The first 3 steps

Book a sweep before you light the first fire of the winter.
Ask for a sweeping certificate and keep it with your home insurance documents.
Burn only dry wood or approved fuel: never rubbish, painted or treated wood.

Stop: danger

Chimney fire (roaring noise, sparks or flames from the chimney pot, a very hot chimney breast): close the stove's air vents and door, do not throw water on the fire, get everyone out and call 999.
Smoke coming into the room, headaches or dizziness: a blocked flue can push carbon monoxide back into the home. Let the fire die down, open windows, get out and call 999 if anyone feels unwell.
Never light a fire in a chimney that has not been used for years until it has been swept and checked.

How often, by fuel

Wood: at least once a year, and up to every three months when in regular use.
House coal (bituminous): up to every three months when in use.
Smokeless fuel: at least once a year.
Oil: once a year.
Gas: once a year, where the flue is designed to be swept; gas appliances also need a yearly check by a Gas Safe registered engineer.

These are the recommendations of the National Association of Chimney Sweeps and fire services; your sweep may advise more often if your chimney gets a lot of use or you burn wet wood.

Is it a legal requirement?

Owner-occupiers: there is no general law in England requiring you to sweep your own chimney. But it is a condition in some home insurance policies, and an insurer may question a claim after a chimney fire if the chimney was not maintained. Read your policy.
If you rent: check your tenancy agreement, which often says who arranges sweeping. The landlord must keep the structure of the home, including the chimney, in repair (Landlord and Tenant Act 1985, section 11), and since 1 October 2022 must fit a carbon monoxide alarm in any room with a fixed fuel-burning appliance such as a wood burner or open fire (Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022).
What you burn: wood sold in small quantities (under 2 m³) in England must be certified "Ready to Burn", meaning 20% moisture or less (GOV.UK). In a smoke control area, you must use an approved appliance or authorised fuel, or risk a fine (Energy Saving Trust).

Choosing a sweep

Look for a sweep registered with a recognised body. Use the "find" tools on the HETAS website (HETAS-registered sweeps) or the National Association of Chimney Sweeps.
Choose one who issues a certificate, checks the smoke draws properly afterwards, and tells you if anything needs repair.
HETAS warns about traders misusing its logo: check the name on its register before booking.

Good to know

"Sweeping logs" can help loosen deposits between sweeps but do not replace a mechanical sweep.
A carbon monoxide alarm near any wood burner or open fire is strongly advised, and required in rented homes and for new installations.
Scotland, Wales and Northern Ireland have their own rules on fuels and rented homes.

Rachel rents a cottage near Exeter with a wood burner. In September she checks her tenancy agreement, which says the tenant arranges an annual sweep. She books a HETAS-registered sweep, keeps the certificate with her contents insurance papers, and checks that the carbon monoxide alarm her landlord fitted is working. She books a second sweep for February, as she uses the stove every evening.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on 1 November 2026, for England. Confidence: high for the safety steps, the CO alarm rule for rented homes and the Ready to Burn rule; medium for sweeping frequencies, which are industry and fire service recommendations rather than law; medium for insurance, which depends on your policy. Official figures on chimney fires in England for the year ending March 2026 are published by GOV.UK; we have not quoted a number we could not check. This guide describes common cases, not a diagnosis.