What Are High-Integrity BNG Units?
As the biodiversity net gain market develops, certain phrases are starting to appear more frequently across the industry. One of those is ‘high-integrity BNG units’. It sounds like a good thing - but is it simply just a clever marketing phrase?
High-integrity BNG units are biodiversity units backed by realistic habitat creation, long-term land management and credible ecological stewardship.
The term is not formally defined in legislation, but it is increasingly used to distinguish habitat banks designed for genuine long-term biodiversity outcomes from those focused primarily on unit sales. In practice, integrity comes down to three things:
- whether the habitat is strategy is realistic for the site
- whether there is genuine land management expertise behind delivery
- whether the management plan is designed to maintain habitat condition over a 30-year period.
For developers, planners and landowners delivering BNG, the language around habitat banks and off-site biodiversity units can quickly become filled with technical or marketing terminology. The biodiversity metric, trading rules and legal agreements are all important parts of the process, but the long-term success of a habitat bank ultimately depends on something much more fundamental: how the land is actually managed over time.
At Integrated Land Management, successful BNG delivery has always been rooted in combining ecological expertise with realistic, long-term land stewardship. That means understanding how habitats establish, how landscapes evolve, and how biodiversity gain sites can function successfully alongside farming and wider land management objectives.
Key Takeaways
‘High-integrity’ is not a regulated term - it is used widely across the BNG market but has no formal definition in legislation
The long-term success of a habitat bank depends on practical land management, not just metric calculations or marketing language
Many successful biodiversity gain sites are still actively managed farmland, integrating habitat creation into working rural landscapes
Developers buying off-site units should ask how a site will be managed over 30 years, not just what units are available today
Habitat Banks are more than numbers on a Metric
BNG units are often discussed in terms of availability, distinctiveness scores and spatial risk - and understandably so. Developers need certainty that off-site biodiversity units can be secured to satisfy planning requirements.
But behind every biodiversity unit is a real piece of land that needs to be created, managed and monitored for at least 30 years. That might involve establish species-rich grassland, restoring wetland habitats, managing hedgerows, creating woodland edges and scrub mosaics, introducing conservation grazing, controlling invasive species and adapting management plans as habitats mature.
The metric provides the framework, but long-term habitat condition is what determines whether a biodiversity gain site genuinely succeeds.
This is where the conversation around ‘high-integrity’ BNG becomes more meaningful. Integrity is not simply about the size of a habitat bank or the wording used in a brochure. It comes from realistic delivery, practical management and long-term stewardship of the land itself.
Can farmland still be used for Biodiversity Net Gain?
One of the most common concerns amongst landowners is that entering land into a BNG agreement means the land can no longer remain productive or actively managed. In many cases, that simply is not true.
At ILM, Sam Paske’s background in farm business management has heavily shaped the way the business approaches habitat delivery and landowner partnerships. That experience brings a practical understanding of how farms operate commercially, how land behaves over time, and what realistic long-term habitat management actually looks like in practice.
This matters because many landowners exploring BNG as a diversification opportunity are not looking to stop managing their land entirely. They want to integrate habitat creation into wider farming or estate management objectives.
Successful habitat creation is not just an ecological exercise. It requires an understanding of soils, water movement, grazing pressure, cutting regimes, seasonality and how land changes over time. Species-rich grasslands, for example, depend on soil conditions, carefully timed cutting and grazing regimes, hydrology and ongoing site management. Wetland habitats and ditch systems require practical water management to function effectively through changing seasonal conditions.
Some of the most successful habitat banks integrate biodiversity enhancement into working rural landscapes through lower-intensity management approaches. Depending on the habitat strategy, this can include:
conservation grazing using native breeds
wetland creation alongside productive farmland
hedgerow enhancement and restoration
rotational scrub management
Rather than removing farming from the landscape entirely, well-designed biodiversity gain sites can support more sustainable and ecologically diverse land management systems. The land changes, but it doesn’t stop being managed - and that distinction matters.
How are habitat banks being managed over 30 years?
Creating a habitat is only the beginning.
The real challenge in biodiversity net gain is maintaining habitat condition over a 30-year management period whilst responding to changing the weather patterns, evolving ecological conditions and the practical realities of managing land at scale.
Every habitat bank is secured through a legal agreement (either a Conservation Covenant or a Section 106 Agreement) and registered on the Biodiversity Gain Site Register. Those legal mechanisms provide the framework. But the day-to-day reality of maintaining habitat quality over three decades comes down to the people managing the land and the decisions they make.
Successful habitat banks require:
realistic management plans
ongoing ecological oversight and monitoring
practical delivery partners who understand the landscape
adaptive management approaches
and landowners or managers who know the site well enough to make informed decisions
For developers and consultants purchasing off-site biodiversity units, long-term management may not always be the first consideration during procurement. Immediate priorities are often availability, location and whether the units satisfy the metric.
But understanding how a biodiversity gain site will actually be managed can provide greater confidence that he habitat strategy is realistic, deliverable and designed to succeed beyond the initial calculation. As the BNG market continues to develop - with NSIP BNG deadlines approaching in November 2026 and spatial risk frameworks shifting to LNRS boundaries - the sites that stand up over time will be the ones where long-term management was taken seriously from the start.
What makes a good habitat bank to buy BNG units from?
When purchasing off-site BNG units, developers and consultants understandably need confidence that a habitat bank is realistic, deliverable and capable of being successfully managed over the long term.
Whilst unit availability and location are often the immediate priorities, asking a few extra questions about how a site will function over time can help reduce delivery risk and provide reassurance around long-term habitat outcomes
Questions to ask before buying offsite BNG units:
How resilient is the habitat bank likely to be over a 30-year period?
How will the habitat be managed over the long term, and by whom?
Does the management approach reflect the practical realities of the site?
Does the site appear to have a realistic and deliverable long-term management strategy?
Is there genuine land management experience behind the delivery, or is it primarily a financial arrangement?
These are the kind of practical considerations that help distinguish habitat banks designed for long-term success from those assessed primarily through headline unit availability alone.
ILM’s experience across both sides of the BNG market gives the team a practical understanding of what successful long-term habitat delivery actually requires. ILM works with habitat banks and landowners who have a genuine vested interest in long-term management and stewardship, giving developers greater confidence in the off-site biodiversity units they are purchasing.
As the BNG market continues to develop, the conversation around habitat quality, spatial risk and long-term delivery is only going to grow. The strongest habitat banks will be the ones that combine ecological expertise, practical land management and genuine long-term stewardship.
That is where the real integrity of a habitat bank is proven - not in a brochure, but in the field.
Frequently Asked Questions
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‘High-integrity'‘ BNG units generally refer to biodiversity units delivered through realistic habitat creation, long-term land management and credible ecological stewardship. Whilst the term is not formally defined within BNG legislation, it is often used to describe habitat banks designed to deliver sustainable, long-term biodiversity outcomes rather than simply satisfying a metric calculation.
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Successful habitat banks combine ecological expertise, practical land management and realistic long-term monitoring to maintain habitat condition over a 30-year period.
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Yes. Many biodiversity gain sites remain actively managed landscapes. Depending on the habitat strategy, farmland can still support activities such as conservation grazing, hedgerow enhancement and wetland management whilst delivering off-site biodiversity units.
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Conservation grazing involves using livestock, often native cattle or sheep breeds, to help maintain habitat condition. Within biodiversity net gain projects, conservation grazing can support species-rich grasslands by controlling dominant grasses, encouraging floral diversity and creating structural variation within habitats.
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Habitat banks are managed through legally secured management plans, typically supported by ongoing monitoring and ecological oversight. Management activities may include grazing, cutting, invasive species control, water management and habitat monitoring to ensure sites establish and maintain their target condition over time.
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Beyond unit availability and location, developers should consider how a site will be managed over the long term, whether the habitat strategy is realistic for the landscape, and whether there is genuine land management expertise behind the habitat bank.
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Yes. Biodiversity gain sites require ongoing management and monitoring throughout the legal agreement period, which is a minimum of 30 years. Long-term management is essential to maintaining habitat condition and achieving the intended biodiversity outcomes.
Looking for off-site units?
Looking to understand how off-site biodiversity units work in practice or explore habitat banks across England? Browse ILM’s BNG Sites Directory to search their registered biodiversity gain sites by LPA, NCA, LNRS area or habitat type.
You can also learn more about ILM’s BNG services or get in touch with the team directly to discuss your project requirements.
