How To Meet Biodiversity Net Gain Regulations in the UK

What Are Biodiversity Net Gain Requirements?

Biodiversity Net Gain is a planning policy that requires development to deliver at least a 10% increase in biodiversity value compared to the site’s original condition.

This is measured using recognised biodiversity metric calculation tools, which assess habitats in terms of biodiversity units. These units take into account habitat type, condition, size, and strategic importance.

BNG applies to most major developments as well as many small sites, with only limited exemptions. The aim is to ensure development contributes positively to nature recovery, rather than simply minimising environmental harm.

 

Step 1: Carry Out an Early Ecological Assessment

The first step in understanding how to meet Biodiversity Net Gain regulations in the UK is to assess the baseline ecological value of the development site.

This typically involves an ecological survey and habitat assessment carried out by a qualified ecologist. The results are then used to calculate existing biodiversity value using the appropriate metric.

Early assessment is essential, as it allows biodiversity considerations to influence the design of the project from the outset.

 

Step 2: Calculate Biodiversity Units

Once baseline conditions have been established, the next step is to calculate biodiversity value in measurable terms.

Using the official metric tools, ecologists determine how many biodiversity units are currently present on the site. From this, they can calculate the uplift required to meet BNG requirements.

This process provides a clear, quantifiable target for developers and helps guide decisions around habitat enhancements.

 

Step 3: Design Habitat Enhancements

To achieve the required uplift, developers must incorporate habitat enhancements into their proposals.

These improvements are often most effective when integrated into the design of the development site. Examples may include:

• Native planting and woodland creation
• Wildflower grassland or meadow areas
• Sustainable drainage features such as ponds or wetlands
• Hedgerow creation or restoration
• Green corridors to support wildlife movement

Designing these features early helps ensure they complement the layout of the development rather than being added as an afterthought.

 

Step 4: Consider On-Site and Off-Site Solutions

Where possible, biodiversity gains should be delivered within the development site itself. However, this is not always achievable.

If on-site enhancements are insufficient, developers may need to secure biodiversity units elsewhere. This can involve:

• Purchasing units from land listed on the biodiversity gain sites register
• Delivering habitat creation on separate land under the developer’s control
• As a last resort, purchasing statutory biodiversity credits

Off-site solutions can help bridge any shortfall, but planning authorities generally prefer on-site delivery where feasible.

 

Step 5: Prepare a Habitat Management and Monitoring Plan

A key requirement of BNG is the long-term maintenance of habitats. Any biodiversity improvements must be managed for a minimum of 30 years.

To demonstrate this, developers must prepare a habitat management and monitoring plan. This document outlines how habitats will be maintained, monitored, and protected over time.

This long-term approach ensures biodiversity gains are sustainable and continue to deliver ecological value well beyond the construction phase.

 

Step 6: Submit BNG Information With Your Planning Application

To meet Biodiversity Net Gain regulations, developers must provide clear ecological evidence as part of the planning application.

This typically includes:

• Baseline habitat survey data
• Biodiversity metric calculations
• Details of proposed habitat enhancements
• A habitat management and monitoring plan

Local planning authorities will review this information when determining whether planning permission has been granted. The projects Collington Winter has worked on show just how providing accurate, well-prepared documentation can significantly improve the chances of a smooth planning process.

 

Key Considerations for Developers

When planning how to meet BNG requirements, there are several important factors to keep in mind:

• Some habitats, such as ‘irreplaceable habitats’, have strict protections and cannot be easily offset
• Early engagement with ecologists reduces the risk of redesign and delays
• Biodiversity improvements should align with the wider landscape and local ecological priorities
• Planning authorities may have specific local requirements or expectations

Taking a proactive approach helps ensure compliance while maximising the benefits of biodiversity improvements.

 

Frequently Asked Questions

Do all developments need to meet Biodiversity Net Gain requirements?

Most developments in England are now required to meet BNG requirements, although some exemptions apply depending on the type and scale of the project. These exemptions may include certain small-scale works or developments with minimal ecological impact, but this should always be confirmed with the local planning authority.

Can small developments meet Biodiversity Net Gain requirements?

Yes. Simplified approaches are available for small sites, but they must still demonstrate measurable biodiversity improvements. Even where the process is less complex, ecological input is often needed to ensure the correct methodology is followed.

What happens if a site cannot achieve enough biodiversity uplift?

If sufficient biodiversity gains cannot be delivered on-site, developers may need to secure off-site units or use statutory biodiversity credits. However, planning authorities will generally expect developers to maximise on-site opportunities before relying on these alternatives.

Who is responsible for monitoring biodiversity improvements?

Developers or landowners are typically responsible for ensuring habitats are managed and monitored over the required 30-year period. This responsibility is usually set out within a legal agreement or planning condition to ensure long-term compliance.

What role does Natural England play in Biodiversity Net Gain?

Natural England provides guidance, tools, and oversight to support the implementation of BNG policy across England. It also publishes the biodiversity metric and offers advice to ensure developments meet national environmental standards.

 

How Can Collington Winter Support You?

Meeting Biodiversity Net Gain requirements can be complex, particularly for developers who are new to the industry and are navigating new planning obligations.

Collington Winter Environmental provides expert ecological consultancy services to support BNG compliance. Our team undertakes habitat surveys, biodiversity metric calculations, and prepares the documentation required for planning applications.

We work closely with clients to design practical habitat enhancement strategies that align with development goals while delivering measurable biodiversity gains. By engaging our ecologists early, you can ensure your project meets regulatory requirements efficiently while creating long-term environmental value.

If you are planning a development and need guidance on how to meet Biodiversity Net Gain regulations in the UK, contact Collington Winter Environmental at info@collingtonwinter.co.uk for expert support.