Planning-ready BNG assessments for Cornwall — clear metrics, proportionate uplift strategies and predictable progress through planning.
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Most developments in Cornwall now require a mandatory 10% biodiversity net gain under the Environment Act 2021.
Local planning authorities expect clear baseline data, a defensible Metric 4.0 calculation and a proportionate uplift strategy before your application can progress.
Across Cornwall, landscape context plays a significant role in shaping planning evidence requirements:
river valleys and wet grassland inland
coastal habitats and associated buffer zones
former industrial and mineral sites
small-field farmland with historic boundaries
woodland and pasture mosaics near settlements
greenfield housing growth around towns and villages
Early understanding of baseline constraints and enhancement opportunities supports a clear planning strategy.
We work throughout Cornwall, supporting projects in Truro, Falmouth, Penzance, St Austell and surrounding communities.
Cornwall LPAs request BNG evidence early because many developments sit close to watercourses, settlement edges or regeneration land, where small layout changes can noticeably affect habitat value and connectivity.
Officers want verified baseline habitats and clear Metric 4.0 scoring before designs progress, so uplift options can be understood without late-stage compromise. The county’s focus on canal corridors, historic field patterns and woodland-edge mosaics also means uplift feasibility needs to be established upfront.
On the ground, site-level features signal when BNG evidence will be needed:
Providing this clarity early prevents validation queries, redesign instructions and delays during casework.
We produce planning-ready BNG Assessments aligned to Cornwall’s policy expectations.
Every report includes:
verified UKHab habitat mapping
defensible condition and distinctiveness scoring
full DEFRA Metric 4.0 calculation
uplift strategy shaped around LPA priorities
integration with layout, drainage and protected species
clear, structured reporting for validation and negotiation
Year-round, with botanical elements best May–September.
Completed once habitat data is verified.
Aligned with design progression and layout refinement.
Used where additional clarity is needed around baseline or constraints.
Our approach keeps evidence proportionate, technically robust and predictable through the full planning sequence.
Contact us and we’ll confirm exactly what your site requires and support a planning-ready, proportionate route forward.
A Biodiversity Net Gain assessment establishes the ecological baseline of a site using the statutory Biodiversity Metric and models the proposed development to confirm whether at least 10 percent measurable uplift can be achieved in accordance with national legislation.
Yes. Development near coastal cliffs or headlands must comply with statutory Biodiversity Net Gain legislation. Baseline habitats such as coastal grassland or scrub must be accurately classified and quantified before modelling development proposals.
Sites near estuaries or tidal inlets may contain higher value habitats. The assessment must carefully map and classify these features to ensure baseline units are correctly calculated within the Biodiversity Metric.
Moorland and heathland fringe habitats may carry higher distinctiveness values. Accurate field survey and condition assessment are essential to avoid underestimating baseline biodiversity units.
Yes. Lodges, caravan parks and tourism developments must demonstrate measurable biodiversity uplift using the Biodiversity Metric where they fall within the statutory scope of the legislation.
Often yes, but feasibility depends on site constraints and baseline habitat value. Early stage metric modelling is important to confirm that sufficient habitat units can be delivered on site.
Shallow soils and exposed coastal conditions can limit the type of habitats that can realistically be created. The BNG assessment must reflect genuine deliverability rather than theoretical planting assumptions.
If the Biodiversity Metric identifies a shortfall in habitat units, the applicant may secure registered off site biodiversity units to meet statutory requirements.
Cornwall Council acts as the Local Planning Authority and reviews Biodiversity Net Gain assessments submitted alongside planning applications.
Planning guidance can be accessed at:
https://www.cornwall.gov.uk/planning-and-building-control/planning/
ProHort undertakes detailed habitat surveys and robust Biodiversity Metric modelling tailored to Cornwall’s coastal and moorland context. We provide clear unit calculations, feasibility advice and defensible reporting to support planning applications.
