There are dormice in your hedge. Here's what that changes.
If you've got a hedge that backs onto Blean Woods — anywhere along the Tyler Hill, Rough Common, Honey Hill, Harbledown, or Blean-village fringe — there's a strong likelihood you have hazel dormice living in the base of it. They're one of the most strictly protected animals in British law. Most contractors will quote you a winter cut on a Blean-fringe hedge and never mention them. That's not great practice.
The Blean is one of the largest blocks of ancient woodland in southern England — about ten square miles of continuous tree cover stretching from Whitstable down to the edge of Canterbury. It's nationally significant for hazel dormouse populations. Kent Wildlife Trust has been running monitoring nest-box transects across the West Blean and Thornden Wood reserves for decades. Numbers fluctuate year-to-year but the underlying population is one of the densest in the UK.
Dormice don't politely confine themselves to the wood. They follow continuous hedgerow links out into the adjoining gardens. If your hedge connects, directly or via another hedge, to the woodland — and on the Blean fringe most do — dormice use it. They feed in it through summer. They build summer day-nests in the body of it. Most importantly for hedge contractors, they hibernate at the base of it, in a tightly woven grass-and-bark nest at or just below ground level, from roughly 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 — and this one's important — "whether or not occupied at the time."
That last clause is the one that catches hedge work. You don't have to harm a dormouse to commit the offence. Destroying the hibernation site at the base of the hedge, when the dormouse isn't currently there, is still an offence. Pulling out a stretch of mature hawthorn-hazel hedge in November because there are no leaves to deal with — perfectly logical from a workload point of view — is exactly the kind of activity the regulation prohibits.
Penalties on conviction: unlimited fine and/or up to six months in prison per offence. In practice prosecutions are rare, but the Natural England enforcement teams take dormouse cases seriously when they're brought.
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, base flailing, stump grubbing, removal. Those need actual thought, not just scheduling.
What good practice looks like
Three things, in order.
Survey before you commit. A pre-works dormouse check is a 15-minute job for someone who knows what they're looking for. You're looking for the characteristic woven nests in the body of the hedge (summer) and signs at the base (hazel nuts opened with the classic round dormouse-tooth hole, droppings, runs through the leaf litter). It's not certainty either way — dormice are nocturnal and cryptic — but it tells you the baseline likelihood.
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.
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 maps to the Blean fringe — and to the chalk-stream river-valley hedges of the Nailbourne running south through Bridge, Bekesbourne, Patrixbourne and Bishopsbourne, where dormouse populations are also documented. The full risk zone covers:
- Tyler Hill, Rough Common, Honey Hill, Blean village, Harbledown — directly on the woodland edge.
- Whitstable Road corridor between Canterbury and Blean — properties backing onto fragmented woodland strips.
- The Nailbourne villages — Bridge, Bekesbourne, Patrixbourne, Bishopsbourne, Kingston — old field hedges with hazel-rich native mix.
- The Stour valley fringes — sections through Chartham, Chartham Hatch and Westbere where the hedges connect back to woodland blocks.
Properties in the city core proper — Wincheap, St Dunstan's, St Stephen's, the Old Dover Road belt — are well clear of the dormouse zone. The species needs continuous canopy connection to its source woodland, and central Canterbury's hedges are too fragmented and too far from the Blean to support populations.
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 dormouse protocol applies and what realistic options look like. Survey is free. No obligation.
Sources: Conservation of Habitats and Species Regulations 2017, regulation 43; People's Trust for Endangered Species hazel dormouse legislation guide; Kent Wildlife Trust West Blean & Thornden Woods reserve information; Natural England European Protected Species licensing guidance.