Preliminary Roost Assessment (PRA) in Sussex
Unsure whether bats could delay your planning application in Sussex?
Our expert-led PRAs provide early clarity on constraints and protect your programme from avoidable setbacks.
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Do you Need a Preliminary Roost Assessment (PRA) in Sussex?
If you’re a homeowner, a PRA is typically required where loft conversions, roof replacements, barn conversions or structural alterations affect buildings with any potential bat roost features. Sussex councils will usually seek confirmation that bats are not using the structure before works proceed.
For developers, PRAs are required where existing buildings, trees or structures form part of a planning submission and planners need early, defensible evidence of bat risk before determining whether further surveys are necessary. This commonly affects housing schemes, conversions, infrastructure upgrades and regeneration sites.
Early confirmation at PRA stage prevents seasonal bottlenecks, redesign and unexpected licensing risk.
Across Sussex, PRAs are commonly required where development interacts with:
• Pre-war coastal housing and town-centre terraces in Brighton, Worthing and Eastbourne with accessible roof features and cavity spaces
• Agricultural and estate building conversions in Chichester, Horsham and Lewes District affecting timber-framed barns and stables
• Brownfield redevelopment near Shoreham Harbour and legacy industrial units in Crawley and Hastings
• Woodland edges, chalk downland valleys and river corridors associated with the South Downs National Park
Requests for PRAs are standard where potential bat roost features sit within the red line boundary.
Our Bat Dusk Emergence Survey services span the whole of Sussex, covering coastal settlements, Downland habitats and urban centres alike.
Why Sussex Planning Authorities Request Preliminary Roost Assessments
Sussex planning authorities require PRAs wherever buildings, trees or structures present any credible roost potential to ensure compliance with the Wildlife & Countryside Act 1981, the Conservation of Habitats and Species Regulations 2017, and national planning policy. Without a PRA, planners cannot lawfully determine whether emergence surveys or licensing will be required. Where early evidence is missing, applications commonly face validation blocks, additional ecological conditions or forced seasonal delay.
If a Sussex project involves demolition, conversion or structural alteration, PRA evidence should be confirmed before the application reaches validation.
Local Case Insight
The Preliminary Roost Assessment Process
Our Preliminary Roost Assessments in Sussex provide fully compliant reports accepted by local planning authorities. It prevents avoidable emergence delays, stabilises planning submissions and ensures that any further survey requirements are proportionate and justified.
Key Deliverables for Sussex Projects
Where bat scoping is required to unlock planning in Sussex, a PRA provides:
a legally defensible preliminary roost assessment report
confirmed classification of roost potential
identification of whether emergence surveys are required
early determination of licensing likelihood
documentation structured for Staffordshire LPA review
The outcome is certainty, not escalation.
Step 1
Programme & Scoping
Proposed works, construction sequence and planning feedback are reviewed to define PRA scope.
Step 2
Daytime Roost Inspection
Inspection of buildings, structures or trees for roost features and bat evidence in line with lawful survey guidance.
Step 3
Assessment
Roost potential classification and planning implications interpreted against LPA validation requirements.
Step 4
Reporting & Integration
Evidence is reported for planning submissions and coordinated with Bat Emergence Surveys or PEAs where required.
Next Steps
Need to confirm whether a Sussex property or development requires a Preliminary Roost Assessment?
Submit the site details and confirmation is provided before your application reaches validation.
FAQ - Preliminary Roost Assessments in Sussex
What is a Preliminary Roost Assessment in Sussex?
A Preliminary Roost Assessment is an initial bat survey undertaken by a qualified ecologist to determine whether a building or structure has potential to support roosting bats. It is commonly required to support planning applications involving roof works, extensions or demolition.
When do Sussex councils require a PRA?
Local Planning Authorities such as Brighton and Hove City Council, Mid Sussex District Council and Arun District Council require a PRA where proposed works may affect buildings or trees with bat roost potential.
Planning guidance for Brighton and Hove City Council can be accessed at:
https://www.brighton-hove.gov.uk/planning
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Do loft conversions in Sussex require a bat survey?
Often yes. Loft conversions can affect roof voids, tiles and access points that may be used by bats. A Preliminary Roost Assessment is commonly requested before planning permission is granted.
Are properties within the South Downs National Park more likely to require a PRA?
Development within or near the South Downs National Park may receive closer ecological scrutiny. Buildings in rural or edge of settlement locations often require bat assessment where roof alterations are proposed.
Is a PRA needed for flat roof extensions?
Yes, if the extension affects an existing roof structure or removes potential bat access points. Even partial roof alterations can trigger the need for assessment.
Do coastal buildings in Sussex support bats?
Coastal properties, including tile hung or flint buildings, can contain crevices and voids suitable for bats. An inspection is required to determine roost potential.
Can a PRA be carried out during winter in Sussex?
Yes. A Preliminary Roost Assessment is a daytime inspection and can be undertaken year round. However, follow up surveys, if required, are seasonally restricted.
What happens if the PRA identifies bat droppings or staining?
If evidence of bat activity is found, further surveys such as dusk emergence or dawn re entry surveys may be recommended to confirm the presence of a roost.
How long does a Sussex PRA report take to issue?
After the site visit, the report is typically issued within a short timeframe, depending on survey complexity and access considerations.
How can ProHort support Preliminary Roost Assessments in Sussex?
ProHort provides professional Preliminary Roost Assessments across Sussex for homeowners, architects and developers. Our reports are clear, planning compliant and designed to reduce delays by identifying bat risk early in the process.
