What is Biodiversity Net Gain (BNG)?

Introduced through the 2021 Environment Act, Biodiversity Net Gain (BNG) requires that developments deliver a measurable increase in natural habitats and ecological features compared to their pre-development state. Compliance is assessed using the biodiversity metric published by Natural England, which assigns habitats a "biodiversity value" based on their size, distinctiveness, and condition. Developers must demonstrate that their projects achieve at least 10% net gain in biodiversity.

Before development begins, a BNG baseline survey is carried out by a qualified ecologist. This survey informs a report, which is then processed through the statutory biodiversity metric to determine:

> The biodiversity units lost due to development.

> The amount of biodiversity that needs to be created or restored.

> The results are incorporated into a BNG report, which forms the basis for planning submissions and off-site habitat strategies if required.

• Richer habitats: Habitat creation and restoration increase variety and quality, supporting a wider range of species.
• Cleaner, healthier environments: Thriving ecosystems naturally improve air and water quality, while features like wetlands can help manage flooding.
• Climate resilience: Greener spaces reduce urban heat and buffer against climate change impacts.
• Connected landscapes: Linking habitats across developments allows wildlife to move freely and thrive.

• Health & wellbeing: Access to green spaces and wildlife boosts physical and mental health.
• Welcoming community spaces: Parks, green corridors, and natural play areas enhance the usability and enjoyment of urban areas.
• Education & engagement: Well-designed green spaces offer opportunities for schools and communities to learn about ecology and conservation.
• Stronger sense of place: Green features celebrate cultural and natural heritage, helping people feel connected to their community.

• Reduced costs: Healthy ecosystems mitigate risks and expenses from flooding, erosion, and extreme weather.
• Green jobs: Designing, creating, and managing biodiversity projects generates employment in ecology, landscaping, and green infrastructure.
• Attractive developments: Green spaces make homes, workplaces, and commercial areas more appealing to buyers, tenants, and investors. Designing, creating, and managing biodiversity projects generates employment in ecology, landscaping, and green infrastructure.

Yes, under the 2021 Environment Act, Schedule 7A of the Town and Country Planning Act 1990 (as amended). All developments in England requiring planning permission must deliver at least 10% biodiversity net gain. This ensures that the biodiversity value of a site after development is greater than before, creating lasting ecological and community benefits.