Hazel Dormouse Surveys

The hazel dormouse Muscardinus avellanarius is protected under the Wildlife and Countryside Act 1981 (as amended) and the Conservation of Habitats and Species Regulations 2017 (as amended).

It is an offence to deliberately capture, injure or kill a hazel dormouse, or to damage or destroy a breeding site or resting place. As a result, development proposals that have the potential to affect hazel dormice or their habitats may require ecological surveys to support planning applications and ensure compliance with wildlife legislation.

When is a Hazel Dormouse Survey Needed?

A hazel dormouse survey may be required where development proposals involve the removal or management of woodland, hedgerows, scrub or other connected habitats that could support the species.

Surveys are most commonly required for sites containing well-connected woody vegetation, particularly where habitats provide a diverse range of food sources, nesting opportunities and links to the wider landscape.

What do Hazel Dormouse Surveys Involve?

The type of survey required will depend on the habitats present and the nature of the proposed works.

Surveys may include:

  • Habitat assessments.
  • Nest tube surveys.
  • Nest box surveys.
  • Footprint tunnel surveys.
  • Nut searches.
  • Advice on avoidance, mitigation and enhancement measures.

Survey findings help determine whether hazel dormice are present and identify any measures required to avoid or minimise impacts.

Mitigation and Licensing

Where impacts to hazel dormice cannot be avoided, mitigation measures may be required. In some circumstances, a licence from Natural England may be necessary before works can proceed.

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BES1
Survey TypeTypical Survey Season
Habitat Assessment Year-round
Nut Search September – December
Nest Tube Survey April – November
Nest Box Survey April – November
Footprint Tunnel Survey April – November
Please note: Dormouse surveys require multiple visits throughout the survey season. Early engagement is recommended to avoid delays to planning applications and development programmes.