Bats in the building: what a protected roost really means for your project.

Every bat, every roost, all year round.

All UK bat species are protected under the Wildlife and Countryside Act 1981 and the Conservation of Habitats and Species Regulations 2017. The protection covers the roost itself even when no bat is home. Works that damage or disturb a roost without a licence are a criminal offence — which is why lenders, planners and building control all now ask the bat question early.

The route through is a European Protected Species (EPS) mitigation licence from Natural England — and everything in the planning application has to be built to support it.

You can’t argue with an emergence count.

At Hyde, a Natural England licensed ecologist ran the programme to the Bat Conservation Trust’s Good Practice Guidelines (4th edition): first a preliminary roost assessment of the building fabric, then a series of emergence and re-entry surveys at the right times of year to establish which species were present, what type of roost it was — maternity, transitional or hibernation — its size, and exactly where in the roof structure it sat.

Two practical lessons owners rarely hear. First, survey season is real: emergence surveys can only be done in the active months, so a project that discovers bats in October may wait until May for data. Ask the question at feasibility, not at submission. Second, the survey isn’t bureaucratic box-ticking — it’s the evidence base for every design decision that follows.

What Natural England actually asks.

An EPS licence is granted only if three statutory tests are met, and the application must evidence each:

• Conservation status — the works must not harm the favourable conservation status of the species concerned
• No satisfactory alternative — you must show the scheme couldn’t reasonably avoid the roost
• Overriding public interest — the development must serve a genuine public benefit

At Hyde, the third test was made on the social value of purpose-designed dementia care in a rural community with an ageing population — a planning argument and an ecology argument working as one document. That integration is the point: a licence application bolted on after consent is far weaker than one designed in from the start.

The roost ends up better off. Genuinely.

The granted strategy at Hyde shows what modern mitigation looks like in built detail:

• Works phased around the bat calendar, with pre-commencement checks and supervision by the licensed ecologist at critical stages
• Temporary roost features provided for the construction period
• Specialist bat bricks (Ibstock Beco or equivalent) built into the masonry at the right heights and orientations for pipistrelles
• Schwegler-type bat boxes on the building and retained mature trees
• Integrated access features in the repaired roofline — designed with both the ecologist and the conservation officer, effective for bats and acceptable on a listed building
• A zero-spill lighting strategy: fully shielded, directional luminaires and an agreed lux limit at the building envelope, because artificial light can sterilise a roost as surely as demolition
• Retained and enhanced foraging habitat — boundary planting and species-rich grassland managed under the landscape plan, counting towards biodiversity net gain

Bats don’t kill projects. Late surveys, thin evidence and bolt-on mitigation kill projects.

If your barn, stable, church or roof void might hold bats: commission the preliminary assessment at feasibility stage, budget for the seasonal survey window, and choose a team that treats the ecology as part of the design — not an obstacle to it. At Hyde the consent, the listed building consent and the EPS licence were all granted, without appeal, on a building that was home to a protected colony throughout.

The full story, including the heritage and care-design strands: Hyde Care Home case study