What to check before you light the wood burner, as colder nights arrive from Friday

Tuesday 13 October is the wet, mild day in that forecast, with heavy rain moving southeast across England and Wales in the morning and blustery winds, then a drier, brighter afternoon, and heavy showers later in the north. Water at the door from that rain sits on the surface-water page. A boiler that will not light sits on the will-not-fire page. The carbon monoxide alarm test sits on the alarm page. This page is the wood burner or open fire: the sweep, the fuel, the flue and the stack, before the colder nights from Friday.

Read the live forecast again before you treat Friday as fixed. A later warning can move the rain and the frost. The sort of the job does not move with it. A cold stove still wants a clear flue, and a bag of wet logs is still the wrong fuel on a mild Tuesday or a frosty Saturday.

What this week’s forecast is asking you to do

The Wednesday-to-Friday paragraph on the Met Office national forecast, updated at the same 15:00 UTC on 12 October, says a band of heavy rain moves slowly south, the north stays rather windy, and conditions turn colder and brighter from Friday with lighter winds. The outlook for Saturday 17 October to Monday 26 October then puts high pressure close to or across the UK. Many places stay largely fine and dry. Weak fronts may still bring some rain, most likely in the far south or the far north. Winds are mostly light. Temperatures sit around normal for the time of year, with frosty mornings in the usual prone areas, and overnight mist and fog patches.

That spell runs through the morning the clocks go back. The programmer check for 2am on Sunday 25 October is on the heating-clock page. A stove has no daylight-saving switch. The useful work this week is to decide, while the house is still mild, whether the flue is fit to light when the rooms actually feel cold.

Fire services already asked for this before the first chilly weekend. Essex County Fire and Rescue Service, on 13 September 2026, told residents to book a professional sweep before lighting the first fire of the autumn, because sweeps get busy once the weather turns. Hampshire and Isle of Wight Fire and Rescue Service marked Chimney Fire Safety Week as 7 to 13 September 2026 and said soot, tar and debris raise the risk after a period of disuse. The campaign week has passed. The colder turn in this forecast has not. Oxfordshire Fire and Rescue Service records 58 chimney fires in its own area in 2025/26, mostly in the colder months. That is one service’s count, and it is a reason to look at your own flue, which is the only one you can do anything about today.

What you can check while the stove is cold

Do this in daylight, with the stove out and the glass cool enough to touch. You are looking, and you are booking. You are not rodding the flue and you are not climbing.

1. Find the last sweep. A receipt, a sticker on the flue, or a date you can point to since last winter is enough to carry on down this list. If you cannot find one, stop and book a sweep before any fire. Defra’s Burn Better, Breathe Better guidance says the chimney should be swept at least once a year, because soot and tar cut the draw and raise the chance of a chimney fire. Oxfordshire’s schedule puts wood, when the stove is in use, at up to four sweeps a year. Staffordshire Fire and Rescue Service names the useful moments as just before the heating season and after a long shutdown. This week is both.
2. Look at the cold appliance. Defra’s own maintenance list is ash cleared out, firebricks checked for cracks, glass cleaned, the door seal checked, and the outside cleaned. A cracked pane, a rope seal that has fallen out, a baffle plate sitting in the ash, or firebricks in pieces means the stove wants a service before it is lit. A new stove, or a flue liner, belongs with an installer on a competent-person scheme. Defra names HETAS, APHC, BESCA, Certsure, NAPIT and OFTEC for that installation work. An annual service is the moment to ask whether the existing installation was done properly.
3. Find the air supply. A stove sized for a room often relies on an air brick or a vent the installer left open. Draught-proofing the house for Friday’s colder nights is a fair job at the letterbox and the loft hatch. Blocking the stove’s own vent, to stop a draught you can feel at ankle height, starves the fire of air. The manufacturer’s plate, usually on the back or in the booklet, says whether that vent has to stay clear. If the booklet is gone, leave the vent open until a sweep or a solid-fuel installer has looked.
4. Press the carbon monoxide alarm in the same room, using the steps on the alarm page. A smoke alarm on the landing is a different sensor and will not warn you about the flue. Oxfordshire asks for a carbon monoxide alarm in any room with a wood burner, open fire or other solid-fuel appliance, and for a test. If the alarm sounds when there is no test button under your finger, leave the house and call 999.
5. Listen at the throat of a cold flue. Twigs in the grate after a summer of disuse, or birds still using the pot, mean you do not light it and you do not poke a nest out with a stick. Active nests are protected. A sweep can tell a finished nest from one that is still in use. An empty flue with a clear pot, seen from the ground, is the result you want before Saturday.

What may go in the firebox

The right fuel is the one the stove manual allows, dry enough to burn cleanly. Defra says wet wood, above 20% moisture, throws off smoke, particles and tar, which coats the flue and raises the chimney-fire risk, and that dry wood gives more heat for the logs you use. In England, GOV.UK’s wood-fuel guidance says wood sold in volumes under 2 cubic metres may be supplied only if it is certified Ready to Burn, which is a moisture content of 20% or less. The logo, the supplier’s details and the certification number should be on the bag or beside the price. That sales rule is the England rule. Dry fuel is still the burning rule Defra gives for the stove itself.

A bulk load of 2 cubic metres or more, or wood you have cut yourself, is not excused from drying. Defra says store it under cover, off the ground, and let it air-dry for at least two years, then check it with a moisture meter at 20% or below. Without a meter, the same page offers rough signs: a lighter log of the same species and size, a hollow tap, cracked ends, bark that has loosened, and a paler colour. Those signs are a hint. A meter is the check. Logs that lived in the rain beside the shed all summer are not ready because the bag they once came from was.

Store the fuel you are allowed to burn away from the stove, not stacked against the glass. Hampshire’s autumn chimney note says never to light a fire with petrol or paraffin. Use the method in the stove booklet: kindling, a small load, and the air controls as the maker set them. A fireguard belongs in front of an open fire. Embers should be out before you go to bed or leave the house, which is Oxfordshire’s line. Ash that still holds heat goes in a lidded metal container, outside and clear of the wall, until it is cold. A plastic bin will not hold that heat.

Smoke control areas

GOV.UK’s smoke control rules say that in a smoke control area you must not release smoke from a chimney, and you may burn only authorised fuel unless the appliance is approved by Defra. Authorised smokeless fuels named on that page include anthracite, semi-anthracite, gas and low-volatile steam coal. Wood is an unauthorised fuel unless the stove is an exempt appliance, and even then you burn only the fuels the approval and the manual allow. The council’s environmental health team is who confirms whether your street is in a smoke control area. A city name is a poor guess: a terrace in a large English city often is, and some smaller towns are too.

The penalties on that GOV.UK page are stated for England: up to £300 if the chimney releases smoke in a smoke control area, and up to £1,000 for buying unauthorised fuel to use in an appliance Defra has not approved. Scotland, Wales and Northern Ireland have their own smoke control rules. Ask the council there, and do not copy the English penalty onto a different nation. An Ecodesign stove has been the rule for new stoves placed on the UK market since January 2022, which Defra notes because they emit less than older stoves and open fires. That is a buying fact for a stove you do not yet own. It does not, by itself, make an older stove illegal to light where smoke control allows it.

The stack, from the ground

Walk outside and look up. Stay on the ground. You want the pot still seated, the stack upright, no shrub growing out of the flue, and flashings that are still tucked into the brick rather than lifting in the wind that comes with this week’s rain. A pot you can see blocked with twigs is a sweep before it is anything else. A stack that leans, a pot that has slipped, or flashings that have opened are a roofing repair, and the stove stays unlit until that repair is done. Water staining on the chimney breast indoors, or in the loft around the stack, is the same decision. The seasonal look from the ground is on the roof-check page. This page only adds the rule that you do not test a doubtful stack by lighting a fire under it.

Open roofing and use the number on the card for that stack, those pots and those flashings. The same lists exist with a city attached, for example roofing in Manchester or roofing in London. A listing is a business you can call. It is not a statement that the firm sweeps flues, and it is not a rating. Ask whether the job they are pricing is the stack and the flashing, and whether the figure includes VAT. The contact-details page only shows how that call works. Nobody here forwards the enquiry.

When you leave it unlit

Stop the lighting plan when any of these is true. A sweep can clear several of them. A fire will not.

• You cannot show a sweep since last winter, or the stove has stood unused since spring and nobody has looked up the flue.
• The glass is cracked, the door will not seal, the firebricks are broken, or the baffle is not where the booklet shows it.
• Smoke came back into the room the last time you lit it, or you can smell smoke in a bedroom the flue passes.
• Birds are using the pot, or the grate has filled with nesting material over the summer.
• From the ground, the pot is blocked, missing or slipped, or the stack has moved.
• The only fuel to hand is wet, painted, treated, or a fuel the manual does not list.
• You are in a smoke control area, the stove is not a Defra-exempt appliance, and the fuel is not on the authorised list.
• The carbon monoxide alarm in the room is missing, silent on test, or past the date on the case.

A gas fire is a different appliance in the same sort of opening. Work on the gas supply, the burner or the flue of a gas fire belongs with a Gas Safe engineer. The Gas Safe notes explain that register. The people to call for a gas appliance are on plumbing and heating. If you smell gas, leave the switches alone and use the gas emergency line. In England, Scotland and Wales that is 0800 111 999. In Northern Ireland, nidirect gives the gas emergency line as 0800 002 001. A wood-burner checklist is the wrong job once you can smell gas.

If it is already lit and goes wrong

A small, bright fire that draws up the flue, with the door seal holding and the room free of smoke, is a stove doing what the booklet describes. Tar dripping from joints, a roar in the chimney breast, or sparks and dense smoke from the pot are the moment to treat it as a chimney fire. Hampshire’s instruction is to dial 999 and ask for the fire service. Get people out. Do not climb to the pot, and do not pour water down the flue. On a closed stove, shutting the air controls as you leave starves the fire only if you can do it without staying in the room. After the brigade has put a chimney fire out, the flue needs an inspection before anyone lights it again. Greater Manchester Fire and Rescue Service says a certified sweep should inspect for damage before the chimney is used.

Smoke in the room on the first lighting, with no roar and no sparks, is still a reason to let it go out and keep it out. Close the stove door if it is a closed appliance, shut the vents, and ventilate on your way out if the room is filling. Relighting “to see if it clears” is how a blocked flue gets a second chance to fill the house. The next person through the door should be the sweep, before any roofer is asked to rebuild a stack that may only have a nest in it. Tell the sweep the last time it was swept, what you burned, and whether you are in a smoke control area. Tell a roofer about a pot, a flashing or a lean you can see from the pavement. Those are two calls, for two different faults.

Questions that decide the next step

Should I light the wood burner on Tuesday while the night is still mild?

Use Tuesday and the rest of the mild, wet spell for the cold checks. The forecast turns colder and brighter from Friday, and frosty mornings are in the outlook from Saturday in the usual prone spots. A stove that has stood since spring wants a sweep, dry fuel and a clear flue before that first fire. You can confirm all three while the metal is cold.

How often should the chimney be swept?

Defra says at least once a year. Oxfordshire Fire and Rescue Service says wood, when in use, up to four times a year. If the last sweep was before last winter, or you cannot find a date at all, book one before this colder spell and leave the stove unlit. A sweep’s visit is also the right time to ask about a stove service for the glass, the seals and the firebricks.

Is a wood burner a Gas Safe job?

Solid fuel is a sweep, and a competent solid-fuel installer when the appliance or the liner needs work. Gas Safe is the register for gas. A gas fire in the same opening is that second trade, on the plumbing list. For the brick stack, the pots and the flashings, use the roofing list and the number on the card. This directory does not list chimney sweeps, and it does not send the booking for you.