When Bat Surveys Are Required for Planning Permission

Bats are a legally protected species in the United Kingdom, which means they must be considered before planning permission is granted for development projects. While their presence does not usually prevent development entirely, failing to assess bats properly during the planning process can lead to delays.

Bat surveys are most effective when conducted during the active season, typically from April to September, and missing this window can create delays in the planning timeline.

Bats are highly adaptable and can use a wide range of landscape features, including trees, buildings, bridges, caves, cliffs, mines, and other structures. These features may provide shelter, protection from predators, or breeding sites, and even very small cracks or crevices can be suitable for roosting.

Why Are Bat Surveys Essential Before Starting Development?

Because all UK bat species and their roosts are legally protected, planning authorities must consider the potential impact of development before granting approval. Where suitable habitat is present, bat surveys may be required to support a planning application.

The presence of bats does not normally prevent development. However, surveys may be needed to understand how bats use a site and whether mitigation measures are required. Where bats are present, development can usually proceed once appropriate ecological measures and any necessary licences have been agreed.

For this reason, ecological advice is often recommended early in the planning process to identify any survey requirements and avoid seasonal delays.

What Types of Bat Surveys May Be Required?

A Preliminary Roost Assessment is usually the first step and involves inspecting features for evidence of bats or suitable habitat.

If bats are identified, further surveys may be required during active seasons to better understand species presence and activity. Depending on the site, this may include activity surveys and transect surveys across larger sites. Further assessments, such as static monitoring to gather additional data, tree assessments where trees may be affected, or hibernation surveys where suitable winter habitat exists, are recommended.

These surveys help provide the ecological information needed to support planning decisions and identify any appropriate mitigation where required. 

When Should Bat Surveys be Completed?

Survey timing is an important consideration, as some bat surveys can only be completed during certain months of the year, particularly April to September, as this is when they are most active. If a survey is needed and this time period has passed, it can result in projects being prevented from moving forward until the next survey season. 

Early ecological advice is crucial, as it allows for the identification and planning of survey requirements alongside development timelines. This helps reduce uncertainty and supports a smoother planning process.

Professional Bat Surveys

Appropriately licensed ecologists should conduct professional bat surveys in accordance with the current Bat Conservation Trust guidance.

At Elite Ecology, we undertake bat surveys across England, Scotland and Wales. Our team provides clear ecological advice, supports planning applications and has experience designing mitigation and compensation measures when required. 

Bat surveys with Elite Ecology start from £350.

Arranging a Bat Survey

If you are planning development works which may affect buildings, trees or other potential bat habitats, seeking ecological advice early can help identify any requirements and reduce the risk of delays.

Get in touch with our team today and our expert surveyors can book you in for an assessment.