Biodiversity Net Gain Surrey: Understanding BNG
As of February 2024, mandatory Biodiversity Net Gain (BNG) has become a priority for most new developments across England. This initiative ensures that all qualifying projects – urban or rural – enhance rather than harm the natural environment. In Surrey, BNG is now an important factor in the planning process, implemented under the Town and Country Planning Act 1990 and strengthened through the Environment Act 2021.
Local Policy and Planning in Surrey
Surrey County Council mandates a minimum 10% net gain in biodiversity for all eligible development applications. This must be clearly evidenced in a biodiversity gain plan as this documentation outlines how development will conserve or enhance habitats and priority species during and after construction.
Developers are also encouraged to contribute to Surrey’s Local Nature Recovery Strategy (LNRS) to support habitat restoration and promote thriving local ecosystems.

Important Measures for Developers to Focus On
To meet BNG requirements in Surrey, developers should take proactive steps to:
- Enhance or protect habitat banks
- Support lowland hay meadows and priority habitats
- Invest in green infrastructure
- Safeguard vulnerable and endangered species
Opportunities to benefit from local woodland creation schemes often exist in rural areas, which improve the environment by fulfilling biological carbon sequestration. However, the most popular avenue for achieving BNG gains away from a site is Off-site biodiversity units, allowing landowners to meet requirements where on-site options are limited.
When BNG Applies
BNG applies to both major and minor developments, including:
- Housing projects with 10 or more dwellings or sites over 0.5 hectares
- Smaller development sites with fewer than 10 dwellings or non-residential floor space under 1,000m²
Regardless of size, all projects must show measurable improvements to local biodiversity. Where on-site BNG gains aren’t possible, developers must purchase approved biodiversity units and secure results for at least 30 years.
Key Principles of Biodiversity Net Gain
To effectively implement BNG and improve Surrey’s nature rates, developers should follow these 10 guiding principles:
- Prioritise avoiding biodiversity loss through the mitigation hierarchy
- Protect irreplaceable habitats
- Ensure transparent stakeholder engagement
- Consider long-term sustainability
- Involve relevant stakeholders at all stages
- Deliver real, lasting gains for nature and local communities
- Anticipate and manage potential risks
- Aim to exceed the 10% minimum
- Use trusted metrics like the Statutory Biodiversity Metric
- Focus on delivering the best possible outcome for biodiversity
Seeking Support with Biodiversity Net Gain, Surrey
If you’re applying for planning permission in Surrey and unsure how Biodiversity Net Gain (BNG) impacts your proposal, it’s highly recommended that you engage with the local planning authority as early as possible. For more complex development, consultants and a qualified BNG specialist during the initial stages can help simplify the process and avoid delays.
How Collington Winter Can Help with Biodiversity Net Gain, Surrey
At Collington Winter Environmental, we provide expert biodiversity planning support to developers throughout Surrey and the wider Midlands. Our team of licensed ecologists offers:
- Habitat surveys and assessments using the Statutory Biodiversity Metric
- Development of complaint habitat management and monitoring plans
- Comprehensive ecological documentation to support planning applications
For personalised guidance on meeting Biodiversity Net Gain (BNG) requirements and enhancing the environmental sustainability of your project, contact us at info@collingtonwinter.co.uk or use the contact form below.
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