What Are Biodiversity Net Gain Services and Why Are They Essential in the UK?
Biodiversity Net Gain became a legal requirement for most new developments in England in 2024 - and with it came a new set of obligations, decisions, and risks for anyone involved in land development.
For many developers and landowners, the question isn’t whether to comply - it’s how to do so efficiently and without unnecessary cost. That’s where outside biodiversity net gain services come in.
This guide explains what they cover, why they matter, and why professional support has become essential rather than optional.
What Is Biodiversity Net Gain?
BNG requires that development leaves the natural environment in a measurably better state than before. In practice, once a project is complete, it must demonstrate at least a 10% net gain in biodiversity value - calculated using the official Defra Biodiversity Metric, which measures biodiversity in “units” based on habitat type, condition, size, and location.
If that gain can’t be achieved on site, developers must source biodiversity units elsewhere - typically through registered off-site habitat banks. A Biodiversity Gain Plan documenting how the 10% will be met must then be approved by the Local Planning Authority before development can legally commence.
Under the Environment Act 2021, this became mandatory for major developments in February 2024 and for small sites in April 2024.
What Are Biodiversity Net Gain Services?
Biodiversity net gain services are professional services that help developers, planners, and landowners meet BNG requirements - accurately, efficiently, and without unnecessary cost.
The rules are technical, the metric is detailed, and the consequences of getting things wrong are real: planning conditions can’t be discharged, development can’t start. Here’s what good BNG services typically cover:
1. Biodiversity Gain Plan Preparation
Preparing the formal Biodiversity Gain Plan — the document your LPA must approve before you break ground — requires specialist input. The plan must demonstrate how you’ll achieve 10% net gain, backed by metric calculations and supporting documentation. Errors or gaps lead directly to delays.
2. Off-Site Biodiversity Unit Sourcing
Where on-site gains aren’t sufficient, you’ll need to source units from registered habitat banks. This is more nuanced than it looks:
• Units must typically come from within the same local authority or strategic area
• Habitat types must align with your LPA’s requirements
• All units must be registered on the Natural England BNG register
Experienced providers can navigate this supply landscape quickly — identifying appropriate units, comparing suppliers, and securing the right match for your project and planning authority.
3. Planning and LPA Support
Good biodiversity net gain services go beyond calculations. They include support with planning documentation and direct liaison with Local Planning Authorities — helping to discharge BNG conditions efficiently and avoid the back-and-forth that holds projects up.
4. Market Intelligence and Pricing Transparency
Biodiversity unit prices vary considerably across habitat types, geographies, and suppliers. Without market data, you’re essentially buying blind. Biodiversity net gain services in the UK increasingly include pricing intelligence tools and reports — helping developers budget accurately from early in the project lifecycle and negotiate from a position of knowledge rather than guesswork.
5. Support for Landowners and Habitat Banks
BNG services also support the supply side. Landowners looking to create habitat banks and sell biodiversity units need help understanding the market, connecting with buyers, and navigating the Natural England registration process.
Why Biodiversity Net Gain Services in the UK Are Now Essential
Planning approval depends on getting BNG right
Without an approved Biodiversity Gain Plan, development cannot legally begin. Local Planning Authorities are applying this requirement with growing confidence — and a poorly prepared plan doesn’t just cause delays, it causes costs.
The metric is technical
The Defra Biodiversity Metric is detailed and data-driven, assessing habitat type, condition, size, and strategic significance. Small errors in assessment can lead to material miscalculations in how many units you need — and that gap tends to surface at the worst possible moment.
Off-site sourcing has real complexity
The biodiversity unit market has grown rapidly — there are now over 165 registered habitat banks across England. But supply isn’t uniform, prices vary significantly, and not every unit is eligible for every project. Expert guidance makes the difference between a smooth procurement and a frustrating one.
30-year commitments need proper legal structures
BNG obligations don’t end when units are purchased. Habitat enhancement must be maintained for a minimum of 30 years, secured through appropriate legal agreements. Getting the right structure in place from the start prevents significant complications later.
Who Needs Biodiversity Net Gain Services in the UK?
In short: anyone involved in land development that triggers the BNG requirement. That includes:
Residential developers
Commercial developers
Infrastructure project promoters
Land promoters and planning consultants
Landowners looking to create and sell biodiversity units
BNG for Nationally Significant Infrastructure Projects (NSIPs) is also due to come into force in May 2026 - expanding the requirement further.
Why It Matters Beyond Compliance
BNG isn’t just about ticking a regulatory box. The UK is one of the world’s most nature-depleted countries, and development has historically made that worse. BNG changes the equation — requiring that development actively contributes to nature recovery rather than simply compensating for what’s lost.
When delivered well, that means improved local ecosystems, better habitats for wildlife, stronger placemaking credentials, and a clearer story for ESG-conscious investors.
Professional biodiversity net gain services help make that happen in a way that’s both legally sound and commercially sensible.
Working on a BNG Project?
Biodiversity Units UK provides whole-of-market access to biodiversity net gain services in the UK - over 165 habitat banks, in-house BNG specialists, and transparent pricing data.
Whether you need to plan BNG into a new scheme or source units quickly to discharge a planning condition, we can help.
Get in touch for a tailored quote, or download our BNG Pricing Report for the latest market data.