Can I Burn Pallet Wood? The UK Safety Guide
Short answer: sometimes. Heat-treated pallets are safe to burn; methyl bromide pallets are toxic and must never be burned. Here's how to check the stamp and stay legal under UK Clean Air Act rules.
The short answer
You can safely burn heat-treated (HT) pallets in a licensed wood-burning stove or boiler. You must NEVER burn methyl bromide (MB) pallets. You cannot burn any pallets in open air on commercial premises (UK Clean Air Act). Check the stamp before burning.
What's safe to burn
Untreated wooden pallets and HT-stamped ISPM15 pallets are safe in a domestic log-burner or biomass boiler. The heat-treatment process uses nothing but heat, so there is no residue or contamination. Timber is typically kiln-dried softwood (pine, spruce) which burns clean and hot.
What's dangerous to burn
- MB (methyl bromide) pallets: fumigated with toxic ozone-depleting gas. Burning releases it. Never burn.
- Painted or stained pallets: paint/varnish releases toxic fumes when burned. Never burn.
- Pallets that carried chemicals, solvents, pesticides or industrial contaminants: residues may be toxic. Never burn.
- Pressure-treated wood (CCA, creosote): contains copper, chromium, arsenic or coal-tar derivatives. Highly toxic when burned. Not common in pallets but worth checking.
How to check the stamp before burning
Look on the corner block or stringer. ISPM15 pallets have an IPPC logo, country code, facility number and treatment code. The treatment code is what matters: HT is safe, MB is toxic, DH is safe, KD may or may not indicate ISPM15 treatment. See our full HT vs KD vs MB stamps guide for stamp decoding.
No stamp? Assume it was never certified for export. Usually fine to burn IF the pallet looks clean (no stains, no paint, no chemical contamination). When in doubt, recycle instead of burning.
UK burning law (Clean Air Act)
Domestic: you can burn clean wood (including HT pallet wood) in a DEFRA-approved log burner or multi-fuel stove. In Smoke Control Areas you must use a DEFRA-exempt appliance.
Commercial: open-air burning of wood on commercial premises is prohibited under the Environmental Permitting Regulations 2016. Burning in a licensed biomass boiler is legal. Burning in bonfires or open skips is illegal and can trigger EA fines.
Better alternatives to burning
In most cases burning pallets is the worst option. Even clean HT pallets are worth more as repair stock or biomass feedstock than as firewood. A reconditioner will collect pallets for free and either refurbish them or send unrepairable stock to a licensed wood-processing facility that converts it to biomass fuel at industrial scale. You save effort and often earn cash. See our how to dispose of pallets guide for all disposal options.
Burning pallets: common questions
Yes, if the pallet is untreated or heat-treated (HT stamp), and you use a DEFRA-approved appliance. Check the pallet is clean, dry and unstained. Pallet wood burns hot so split it smaller than standard logs to avoid chimney damage.
HT (heat-treated) and DH (dielectric heating) stamps are safe. These treatments use only heat with no chemicals. KD (kiln-dried) is usually safe. MB (methyl bromide) is toxic and must never be burned.
No stamp usually means the pallet was never treated for export (most domestic pallets). Usually safe to burn if clean, dry and unstained. Avoid burning any pallet with paint, stains, oil marks, or visible chemical contamination.
Open-air burning of wood waste on commercial premises is banned under UK Environmental Permitting Regulations 2016. The Environment Agency can issue fines up to £50,000 for commercial bonfires. Domestic garden burns are allowed but must not cause smoke nuisance to neighbours.
Not easily. Firewood sold in the UK must meet Ready to Burn certification rules (moisture content below 20%, nail-free, chemical-free). Pallet wood typically has nails, staples and mixed timber types that make it impractical as retail firewood. It is more efficiently converted to biomass chips at industrial scale.