Ready to Burn Rules: What Fuel Can You Legally Burn?

What the Ready to Burn mark certifies

Ready to Burn is a certification scheme covering domestic solid fuels. For firewood, it certifies moisture content at or below 20%. For manufactured solid fuels, it covers sulphur content and smoke emissions. The point of it is to give buyers a way to identify fuel that burns hot and clean without having to own a moisture meter.

It is worth being precise about what it does not tell you. It certifies the fuel at the point of sale. Wood stored badly after you buy it — stacked against damp ground, covered in a sealed tarpaulin that traps moisture, or kept in an unventilated shed — will climb back above 20% and behave like unseasoned timber regardless of what the bag said.

The legal position is not the same across the UK

In England, regulations introduced in 2021 restrict the sale of wet wood in small volumes and of traditional house coal for domestic use, and this is where most of the online writing about Ready to Burn comes from. Those specific regulations are made for England.

In Scotland the picture is different, and Ready to Burn functions largely as a voluntary quality certification rather than as the same statutory sales restriction. Separately, smoke control legislation applies across Great Britain and is administered locally, so what you may burn in a smoke control area depends on your council's declared areas and on whether your appliance is exempt.

The honest summary for a Scottish stove owner is this: the labelling scheme is a reliable shortcut to good fuel wherever you live, the statutory sales restrictions were made for England, and smoke control area rules are a separate question to ask your own council.

• Ready to Burn mark — reliable indicator of dry, low-sulphur fuel throughout the UK
• English wet wood and house coal sales regulations — made for England
• Smoke control areas — declared and administered by your local council
• DEFRA exempt appliances — a UK-wide list, relevant if you are in a smoke control area

What wet wood actually does to your flue

This is the part that matters more than any label. Water in timber has to be boiled off before the wood can burn, and that energy comes out of your fire rather than out of your radiator. A log at 40% moisture spends the first part of its life in the stove steaming rather than heating.

Two things follow. First, the flue gases run cooler, so the draw weakens and the stove performs badly — sluggish fires, blackened glass, smoke spilling when you open the door. Second, the unburnt volatiles condense on the cooler flue walls as tar. Tar narrows the flue, is difficult to remove once hardened, and is the fuel for a chimney fire.

We can tell what somebody has been burning within about a minute of opening a flue. Dry wood leaves a light, powdery, easily brushed soot. Wet wood leaves a sticky black deposit that has to be worked at, and in bad cases a hard glazed layer that needs specialist removal.

Buying and storing fuel so it stays dry

Kiln-dried wood arrives ready to use and is the simplest option if you have limited storage. Seasoned wood is cheaper but you are relying on someone else's definition of seasoned, which is why a moisture meter is one of the few genuinely useful gadgets a stove owner can buy.

Storage does the rest of the work. Wood needs airflow more than it needs shelter from rain: raised off the ground, stacked loosely with gaps, roof covered, sides open. A woodpile sealed under a tarpaulin sweats and rots. Bring the next few days' worth indoors so it acclimatises to room temperature before it goes on the fire.

• Aim for 20% moisture or below — check with a meter rather than by eye
• Stack off the ground with air moving through the pile
• Cover the top, leave the sides open
• Never burn painted, treated, laminated or reclaimed construction timber
• Avoid household waste, cardboard and glossy paper — they foul the flue and the glass

Fuel and sweeping frequency

Sweeping frequency is not a fixed number; it is a function of what you burn and how much. A stove burning dry wood moderately through the winter is a different maintenance proposition to one burning damp softwood daily.

If you switch to properly dry fuel, you will usually see the difference in the deposits at the next sweep. That is the practical argument for Ready to Burn certification in Scotland even where it is not a statutory sales restriction: it protects the flue you have already paid to line.

Frequently asked questions