There are dormice in your hedge. Here's what that changes.
If you have a hedge that backs onto Blean Woods, or sits along the Tyler Hill, Rough Common, Honey Hill, Harbledown or Blean-village fringe, hazel dormice may be living in the base of it. They are one of the most strictly protected animals in British law. A winter cut on a hedge like that deserves a bit of thought first.
The Blean is one of the largest blocks of ancient woodland in southern England, with continuous tree cover stretching from near Whitstable down to the edge of Canterbury, and hazel dormice are a known part of its wildlife. Local conservation groups monitor dormice in the woods. Numbers fluctuate from year to year.
Dormice don’t always stay inside the wood. They can follow connected hedgerows out into adjoining gardens, so if your hedge connects, directly or via another hedge, to woodland, dormice may use it. They feed in it through summer and build summer nests in the body of it. Most importantly for anyone cutting a hedge, they hibernate at the base of it, in a tightly woven nest at or just below ground level, from roughly October or November to April.
The legal position
Hazel dormice are a European Protected Species under the Conservation of Habitats and Species Regulations 2017 (the post-Brexit consolidation of the EU Habitats Directive). The relevant offences for hedge work are listed in regulation 43:
- Deliberately capturing, injuring or killing a dormouse.
- Deliberately disturbing a dormouse, including disturbing one in a way likely to affect breeding, hibernation, migration or local population.
- Damaging or destroying a breeding site or resting place. Regulation 43 has no “while occupied” qualifier on this one.
That last offence is the one that catches hedge work. You don’t have to harm a dormouse to commit it. Destroying the hibernation site at the base of the hedge, when the dormouse isn’t currently there, can still be an offence. Pulling out a stretch of mature hawthorn-hazel hedge in November because there are no leaves to deal with is exactly the kind of activity the regulation is aimed at.
Penalties on conviction: a fine and/or up to six months in prison. Regulation 43 sets those penalties for summary conviction.
What about cuts where the hedge isn't removed?
A routine top-and-sides cut on a Blean-fringe hedge isn't usually a problem, because the hibernation nest is at the base, below the reach of a hedge trimmer, and the summer breeding sites are inside the body of the hedge, not at the top. The trouble starts with heavier work: hard reductions that take the hedge down to half-height or less, and base flailing. Those need actual thought, not just scheduling.
What good practice looks like
Three things, in order.
Look before you commit. A walk-over check is a sensible first step. You are looking for woven nests in the body of the hedge (summer) and signs at the base such as hazel nuts opened with a smooth round hole and neat tooth marks, and runs through the leaf litter. It is not certainty either way, because dormice are nocturnal and cryptic. A proper dormouse survey, and any disturbance of a nest, needs a licensed ecologist.
Time the heavy work right. If you have to do a hard reduction or a removal on a Blean-fringe hedge, the right window is October to early November, after the active summer season, before the dormice settle into hibernation at the base. You'll see them having moved if they're there. Avoid the November-to-April hibernation window entirely for any work below 1m hedge height. Avoid the April-to-September active-breeding-and-young-in-nest window for anything heavier than a routine top trim. Where the hedge is a native mix of hawthorn, hazel and blackthorn that has grown gappy or into a line of small trees, the October-to-early-November window is also the right moment for traditional hedge laying: it leaves the hedge base undisturbed during and after the work, and produces excellent dense dormouse habitat as the new growth thickens over the following two to three years. See our guide to hedge laying in the South of England style.
Leave the hedge base undisturbed. For any work, the bottom 30cm of the hedge, the leaf litter, the moss, the lower stems and the brash that's accumulated around them, is the hibernation zone. Don't strim it. Don't rake out the leaf litter. Don't "tidy" the base. If you're removing a stretch of hedge entirely, that base material needs to be left in situ for at least a full year after the upper hedge is gone, so any dormouse currently hibernating there has a season to emerge and relocate.
If you need a licence
For most domestic hedge work, you don't. Routine cutting is fine. Sensible-window reductions are fine. A 15-minute survey and timing-window discipline cover the realistic obligation.
You do need a Natural England European Protected Species licence, and a professional ecologist to obtain it, if you're proposing to:
- Remove a stretch of dormouse-occupied hedge as part of a planning permission (most commonly: garden extensions, new boundary walls, driveway works that take out a hedge line).
- Grub out the base of an ancient woodland-connected hedge as part of redevelopment.
- Do anything that the local planning authority's conditions specifically require a licence for.
If you're doing a normal hedge cut, you're not in this territory. If a planning officer has mentioned the words "ecological survey" in any of your paperwork, you probably are.
Where this applies
The dormouse risk is highest around the Blean woods, and can extend along hedges that connect to woodland elsewhere in the district. The areas to be most careful about are:
- Tyler Hill, Rough Common, Honey Hill, Blean village, Harbledown, directly on the woodland edge.
- Properties backing onto woodland strips between Canterbury and Blean.
- Old field hedges with a hazel-rich native mix in the villages south and east of the city.
- Hedges in the Stour valley that connect back to woodland blocks.
Gardens in the middle of the city are much less likely to have dormice, because the species needs continuous cover connecting back to woodland, and central hedges are fragmented and a long way from the Blean. If your garden is in the city and you want to support wildlife, making a small gap in a fence panel for hedgehog passage is a good place to start: see our guide to hedgehog corridors in Canterbury garden hedges.
Wondering if your hedge is in the zone?
Send your postcode and a photo of the hedge to hello@canterburyhedges.co.uk, or call 07763 100 477. We’ll tell you whether the dormouse precautions are likely to apply and what realistic options look like.
Sources: Conservation of Habitats and Species Regulations 2017, regulation 43 (legislation.gov.uk); People’s Trust for Endangered Species, hazel dormouse guidance; Natural England, European protected species licensing guidance. Checked 12 October 2026.