The introduction of mandatory biodiversity net gain (BNG) under the Environment Act 2021 has reshaped the economics of land management in England. Developers must now deliver at least a 10% net gain in biodiversity for most new developments, creating a regulated BNG market for off-site biodiversity units.
For farmers and landowners, this presents a significant opportunity. By creating BNG units through habitat creation and ecological restoration, landowners can generate additional income while contributing to environmental sustainability and nature recovery.
This article explains how landowners’ BNG opportunities work in practice, the legal framework involved, and how to leverage BNG credits to generate new income streams responsibly and profitably.
The Legal Basis for Biodiversity Net Gain
Biodiversity net gain is a statutory planning requirement introduced by the Environment Act 2021. Official policy and operational guidance are published through the government’s biodiversity net gain guidance.
Under BNG requirements, developers must demonstrate measurable biodiversity improvements using the statutory biodiversity metric developed by Natural England. The metric tool and methodology are available through the statutory biodiversity metric guidance.
Where development projects cannot achieve BNG entirely on site, they must secure off-site BNG units or, as a last resort, purchase statutory biodiversity credits from the government. This requirement underpins the emerging BNG market.
Understanding Biodiversity Units and Ecological Value
Biodiversity units measure ecological value based on habitat type, condition, distinctiveness and habitat size. A baseline assessment calculates the existing biodiversity value of the land. Proposed habitat creation or habitat restoration is then modelled through the biodiversity metric to determine how many biodiversity units can be generated.
Factors such as difficulty, time to maturity and spatial location influence how many biodiversity units a site can realistically deliver. The number of BNG units available for sale depends on habitat enhancement design, ecological importance and long-term management commitments.
Sites capable of delivering high-quality habitat enhancements such as wetland creation, wildflower meadows or woodland restoration may generate stronger market demand due to their contribution to nature recovery and wider ecosystem services, including carbon sequestration.
How Landowners Generate Income from BNG Credits
To leverage BNG credits, landowners must legally secure land for biodiversity management for a minimum of 30 years. This is achieved through legally binding agreements, typically either a section 106 agreement with a local planning authority or conservation covenants entered into with a responsible body. Government guidance on conservation covenants is available through the conservation covenant framework.
Once legally secured, the land must be registered as a biodiversity gain site on the statutory register operated by Natural England. The process is outlined in the Biodiversity Gain Site Register Guidance.
Only after registration can land managers allocate BNG units to development sites requiring off-site biodiversity units to meet planning permission conditions.
Income is generated through the sale of biodiversity credits or off-site BNG units to developers seeking to achieve BNG obligations linked to property development, infrastructure schemes or nationally significant infrastructure projects.
Strategic Land Management and Market Positioning
Landowners seeking to generate income through BNG should undertake early engagement with ecologists, land agents and legal advisers. Strategic positioning within a local planning authority area can significantly influence demand. Developers are incentivised through spatial risk multipliers within the biodiversity metric to source units locally.
Enhancing habitats in proximity to development sites can therefore increase commercial attractiveness. Aligning habitat creation with local nature recovery strategies may also strengthen ecological value and marketability.
BNG credits may also complement other nature markets such as nutrient credits linked to nutrient neutrality requirements or emerging carbon credits markets focused on carbon sequestration. Integrated land management strategies can create diversified income streams grounded in environmental sustainability.
Financial Considerations and Long-Term Obligations
While BNG units can generate additional income, landowners must understand the long-term nature of the commitment. Habitat created under BNG must be maintained for at least 30 years. Ongoing management, monitoring plans and reporting obligations are enforceable under legal agreements.
Tax implications, inheritance considerations and potential impact on agricultural direct payments should be reviewed carefully. Professional advice is essential before committing land to off-site BNG.
It is also important to recognise that statutory biodiversity credits sold by the government function as a pricing backstop. These are designed to encourage private market participation rather than replace it.
Risk Management and Environmental Integrity
Successful landowners’ BNG schemes require ecological integrity. Poorly designed habitat restoration projects may fail to deliver projected biodiversity improvements, creating reputational and legal risks.
Robust biodiversity management planning, clear governance structures and collaboration with conservation organisations or conservation groups can strengthen delivery and enhance credibility within the BNG market.
The goal is not simply to create habitats for commercial purposes, but to deliver measurable biodiversity impacts that contribute to long-term nature recovery.
Integrating BNG into Sustainable Land Management
BNG aligns closely with sustainable land management principles. Habitat restoration, green spaces, ecological restoration and enhancing biodiversity all contribute to wider ecosystem services.
For farmers and landowners facing volatile commodity markets, leveraging BNG credits offers a mechanism to generate income linked directly to environmental outcomes. This shift reflects broader private investment trends within nature markets and growing regulatory emphasis on environmental sustainability.
Expert Guidance for Landowners
The regulatory framework governing biodiversity net gain is technical and evolving. Success depends on accurate metric modelling, robust legal structuring and strategic engagement with developers and local authorities.
As a specialist provider in biodiversity net gain and habitat banking, Civity NGE supports landowners in assessing land suitability, creating BNG units, securing conservation covenants and positioning sites effectively within the BNG market.
Disclaimer
This article provides general information on biodiversity net gain in England and reflects current legislation and guidance at the time of writing. It does not constitute legal, financial or ecological advice. Landowners should obtain independent professional advice tailored to their circumstances before entering into legally binding agreements or committing land to biodiversity net gain schemes. Regulations, guidance and market conditions may change.
