Understanding the BNG Mitigation Hierarchy
The BNG mitigation hierarchy provides a clear framework for achieving measurable biodiversity net gain through responsible and sustainable design.
By applying the BNG mitigation hierarchy from the earliest planning stage, developers can avoid harm, minimise residual impacts, restore on-site habitats, and offset unavoidable losses. This structured, evidence-based process aligns with national policy and ecological best practice, ensuring every project contributes positively to nature recovery. Understanding how these four stages work together helps planners, architects, and ecologists create development proposals that deliver compliance, protect valuable habitats, and enhance long-term biodiversity outcomes across both on-site and off-site environments.
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- Off-site BNG strategy & unit sourcing advice
- Habitat Management & Monitoring Plans (HMMP)
- Pre-application BNG feasibility & risk reviews
- Planning condition discharge & post-consent support
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Introduction Why the Mitigation Hierarchy Matters
The BNG mitigation hierarchy is a fundamental framework in biodiversity design principles and sustainable land use planning. It refers to a four-stage approach Avoid, Minimise, Restore, offset that developers must follow to reduce ecological harm and achieve biodiversity net gain (BNG). By prioritising avoidance of impacts, then minimising any unavoidable damage, restoring habitats on-site, and finally offsetting residual losses, projects can meet environmental compliance requirements and contribute to conservation strategies. This sequential process is essential for environmental risk management: it ensures all possible steps are taken to prevent or mitigate harm to wildlife and habitats before resorting to compensation. Embracing this “nature first” approach helps reduce a development’s ecological footprint and delivers biodiversity net gain in a way that supports long-term environmental sustainability practices. In short, the mitigation hierarchy matters because it underpins responsible development it is the roadmap for designing projects that leave nature better off than before.
Policy and Legislative Background
The mitigation hierarchy is embedded in UK planning policy and law. The National Planning Policy Framework (NPPF 2023) explicitly requires planners and developers to apply this hierarchy. Paragraph 186(a) of NPPF states that if significant harm to biodiversity “cannot be avoided (through locating on an alternative site with less harmful impacts), adequately mitigated, or, as a last resort, compensated for,” then planning permission should be refused. In practice, this means authorities expect evidence that a project has avoided sensitive habitats where possible, minimised impacts through design, and only then offset any remaining losses. This principle is reinforced by industry guidance: for example, the Chartered Institute of Ecology and Environmental Management (CIEEM) Ecological Impact Assessment Guidelines (2018) advise following a sequential approach of avoidance, mitigation and compensation (with enhancement) for ecological effects.
Legally, mandatory BNG was introduced by the Environment Act 2021. This Act (via an amendment to the Town and Country Planning Act 1990) requires that new developments in England deliver at least a 10% net gain in biodiversity value. From November 2023 (for major projects) and April 2024 (for small sites), almost all planning permissions must include a pre-commencement Biodiversity Gain Plan showing how the 10% BNG will be achieved. This statutory requirement entrenches the mitigation hierarchy: the BNG plan must outline steps taken to avoid and minimise harm, and detail on-site habitat retention, creation or enhancement, before resorting to off-site measures. Some limited BNG exemptions apply (for example, householder extensions, small self-build projects under 0.5ha, and certain de minimis habitat impacts). However, the general rule is that the mitigation hierarchy must be followed, and biodiversity gains demonstrated, for most developments under the new BNG regulations 2024.
Stage 1 – Avoidance
Avoidance is the first and most important stage of the BNG mitigation hierarchy. It means proactively preventing biodiversity impacts before they occur, through careful site selection, layout design, and timing of works. Early in project planning, developers should undertake constraints mapping and ecological impact assessments to identify valuable habitats, protected species, or other ecological sensitivities. The aim is to shape the proposal so that significant features remain untouched for instance, developing on previously degraded land rather than biodiverse greenfield areas, or redesigning layouts to avoid ancient woodland, wetlands, or wildlife corridors.
Applying the avoid minimise restore offset sequence early helps meet environmental compliance and demonstrates sound biodiversity design principles. Effective avoidance also depends on early stakeholder engagement, including dialogue with ecologists, local planning authorities, and community groups to identify key ecological constraints and explore sustainable land use planning alternatives. Timing construction outside sensitive seasons, such as breeding or migration periods, and using low-impact methods are further examples of embedded mitigation.
By prioritising avoidance, developers significantly reduce a project’s ecological footprint and manage long-term environmental risk. It is often the most cost-effective stage: impacts prevented now mean fewer complex restoration or compensation measures later. When done well, avoidance helps eliminate irreversible losses of biodiversity and supports a sustainable model of development. It also delivers habitat fragmentation solutions, maintaining connectivity between retained areas.
Ultimately, avoidance represents more than a procedural step it is a design philosophy that places nature first. Under current BNG regulations, failure to demonstrate avoidance can result in non-compliance or planning refusal. Preventing harm is always preferable to attempting to fix it later.
Early Site Selection and Constraints Mapping
Implementing avoidance starts with early site selection and constraints mapping. Before a detailed design is drawn, the project team should identify any ecological “no-go” areas. This involves conducting preliminary ecological appraisals, reviewing local records for protected species and habitats, and checking spatial plans like Local Nature Recovery Strategies. Planners can then adjust the scheme to avoid these constraints. For instance, if a proposed development area overlaps with a priority habitat (e.g. an ancient hedgerow or a pond home to great crested newts), the layout can be redesigned to exclude or buffer that feature. GIS-based constraints mapping is a useful tool at this stage to visualise ecological sensitivities on a map. By overlaying constraints, designers can often find an alternative site configuration that sidesteps critical habitats entirely. Habitat fragmentation solutions are also considered here e.g. maintaining wildlife corridors through a site or leaving strategic green buffers to ensure connectivity. Early avoidance decisions often involve stakeholder engagement: ecologists, local planning ecologists, or Natural England might be consulted to verify where harm can be avoided. In practice, early avoidance might mean foregoing development on part of a site (sacrificing some developable land) to protect a high-value habitat patch. While this requires strategic compromises, it exemplifies the “avoid first” principle. By using constraints mapping and smart site selection at the outset, a project demonstrates adherence to the mitigation hierarchy from its very inception.
Stage 2 – Minimisation
Even with the best avoidance efforts, some biodiversity impact may still occur. The second stage of the BNG mitigation hierarchy Minimisation focuses on reducing unavoidable harm as far as possible through careful design and management. This step aims to lessen the extent, intensity, and duration of ecological effects, ensuring that any remaining impacts are temporary and controlled. Minimisation often involves mitigation by design, where biodiversity protection is embedded into the project layout and construction methods from the outset.
Practical techniques to minimise impacts include modifying building placement to retain mature trees or hedgerows, using quieter machinery or acoustic barriers to limit noise disturbance, and designing sensitive lighting to avoid disrupting bats or nocturnal wildlife. Developers can also apply water conservation and sustainable drainage systems to protect aquatic habitats, or phase works so only part of a site is disturbed at once. Creating buffer zones and habitat fragmentation solutions, such as wildlife underpasses or green bridges, helps maintain ecological connectivity while supporting sustainable land use planning.
Strong biodiversity design principles and ongoing monitoring are vital. Ecologists should oversee works to ensure measures remain effective and adjust them where necessary. These actions demonstrate robust environmental risk management and proactive compliance with planning policy. Minimisation is also cost-efficient reducing the need for extensive restoration or offsetting later.
Ultimately, effective minimisation proves that developers have done everything feasible short of complete avoidance. It reassures regulators that residual impacts are managed responsibly, aligning the project with good practice and full environmental compliance under the avoid minimise restore offset approach.
Design Adaptations and Impact Reduction Techniques
During the minimisation stage of the BNG mitigation hierarchy, developers apply a range of design adaptations and impact reduction techniques to limit ecological harm and ensure environmental compliance.
- Sensitive Site Layout: Adjust infrastructure locations to avoid key ecological features, such as routing access roads around habitat hotspots or clustering buildings in less sensitive areas.
- Construction Best Practices: Use methods like directional drilling instead of open trenching to cross sensitive zones, minimising soil disturbance, or employ bog mats to protect ground flora from heavy machinery.
- Noise, Light and Pollution Control: Install acoustic barriers or use quieter equipment to reduce wildlife disturbance. Direct lighting downward and use timers to avoid disrupting bats and insects. Include silt traps and sustainable drainage to protect watercourses.
- Phasing and Timing: Stage works so that habitat removal is gradual, allowing wildlife to relocate. Schedule heavy activities outside breeding or nesting seasons, following ecological impact assessment recommendations.
- On-site Ecological Supervision: Appoint an Ecological Clerk of Works to oversee construction, relocate protected species if encountered, and ensure fencing protects retained trees and habitats.
By integrating these techniques, developments can significantly reduce their environmental footprint and uphold good biodiversity design principles. Effective mitigation measures should be specific, measurable, achievable, relevant, and time-bound (SMART). Planning authorities typically require detailed method statements and condition their implementation. In sum, through considered design and proactive management, projects reduce residual harm that cannot be avoided, demonstrating robust environmental risk management and advancing sustainable land use planning.
Stage 3 – Restoration
Even after avoidance and minimisation, some biodiversity loss is often unavoidable. The third stage of the BNG mitigation hierarchy Restoration focuses on repairing and enhancing on-site habitats to compensate for residual impacts. Restoration (also known as rehabilitation or on-site compensation) involves active measures to restore degraded ecosystems or improve their ecological quality once construction is complete. This phase is vital for achieving measurable biodiversity net gain on-site: it is where developers enhance habitat condition, create new ecosystems, and secure long-term ecological resilience.
On-site restoration can include diverse habitat restoration techniques such as reseeding disturbed grassland with native wildflower mixes, replanting trees lost during works, or creating new hedgerows, ponds, and wetlands. Restoring compacted soils, removing invasive non-native species, and introducing green infrastructure such as living roofs, rain gardens, or planted walls can greatly increase biodiversity value in urban projects. Additional measures, like installing bat boxes, bird bricks, or insect hotels, further strengthen wildlife networks and address habitat fragmentation solutions.
The goal of restoration is not only to replace what was lost but to enhance biodiversity beyond baseline conditions, aligning with the avoid minimise restore offset approach and biodiversity design principles. Under the BNG regulations, developers must deliver at least a 10% net gain, verified through the BNG metric and guided by a Habitat Management and Monitoring Plan (HMMP) typically following Natural England’s JP058 template. These plans secure stewardship for at least 30 years, ensuring environmental compliance, sustainable management of natural resources, and long-term ecological performance.
Restoration is therefore not a one-off activity but a lasting commitment to responsible land use planning and proactive environmental risk management that helps achieve lasting biodiversity gain.
Habitat Enhancement On-Site
Effective on-site restoration within the BNG mitigation hierarchy relies on targeted habitat enhancement measures tailored to the site’s ecological context. These interventions strengthen biodiversity value, improve landscape connectivity, and support sustainable land use planning.
- Revegetation and Tree Planting: Areas disturbed during construction can be revegetated with native plant communities. Planting local woodland species or creating species-rich grassland on former arable land not only restores lost vegetation but also sequesters carbon and enhances habitat fragmentation solutions.
- Wetland and Watercourse Rehabilitation: Creating or improving ponds, swales, or wetland scrapes boosts aquatic biodiversity. Transforming straightened channels into meandering, vegetated streams restore ecosystem services such as flood attenuation and water purification.
- Soil Restoration: Decompacting and enriching soil allows native flora to recover, promoting healthy vegetation and supporting fauna.
- Invasive Species Control: Removing invasive species (e.g. Japanese knotweed, Himalayan balsam) enables native habitats to regenerate and strengthens ecological resilience.
- Habitat Creation Features: Introducing log piles, wildflower meadows, green roofs, or pocket parks increases urban biodiversity and supports ecosystem service valuation, improving air quality, climate regulation, and recreation.
Qualified Ecologists
All on-site habitat enhancements should be guided by qualified ecologists and align with local and national biodiversity design principles. Projects should use native species of local provenance and target habitats identified in Local Nature Recovery Strategies. Monitoring ensures each enhancement contributes measurable biodiversity net gain, calculated using the Defra Biodiversity Metric 4.0. Ultimately, the restoration stage ensures ecological losses are repaired, the site’s biodiversity value exceeds its baseline, and long-term environmental compliance is achieved before any off-site compensation is considered.
Stage 4 – Offsetting
Offsetting, or biodiversity compensation, is the final stage of the BNG mitigation hierarchy. It delivers biodiversity offsets off-site at a location separate from the development to compensate for residual losses that cannot be addressed on-site. Offsetting is applied only after the first three stages (avoid, minimise, restore) have been fully implemented and the project still falls short of achieving its biodiversity net gain target. While on-site measures are always preferable, practical constraints such as site size, feasibility, or time can limit what can be achieved within a development’s boundary.
Under the BNG regulations 2024, off-site compensation can take several forms. Developers may purchase biodiversity units from an approved BNG habitat bank or offset site, where new or enhanced habitats are created specifically to generate unit credits. Alternatively, they may create or restore habitat on other land they own or manage in partnership with local landowners. If these options are not viable, statutory biodiversity credits can be purchased from government as a last resort, funding large-scale habitat projects nationally.
The offset hierarchy prioritises local over distant compensation offsets should be as close as possible to the impact site to benefit the same ecosystems and communities. Off-site habitats must demonstrate additionality (gains beyond existing obligations) and be legally secured for at least 30 years through agreements or conservation covenants.
Offsetting represents the option of last resort within the avoid minimise restore offset sequence. Its purpose is to balance unavoidable impacts while maintaining environmental compliance, supporting sustainable land use planning, and promoting long-term natural resource management. When appropriately designed, offsets can achieve meaningful landscape-scale gains and reinforce national biodiversity design principles for a truly net positive outcome.
When Off-Site Units Are Appropriate
Off-site biodiversity units or credits become appropriate in scenarios where on-site measures fall short. Typical situations include:
- Spatial Constraints: Urban or infrastructure projects may simply lack the physical space to recreate all habitats lost. If a city centre development removes a small patch of meadow, creating an equivalent meadow on-site might be impossible; purchasing off-site meadow habitat units can compensate for that loss.
- Residual Impacts on High-Value Habitat: Certain impacts (e.g. loss of an area of priority habitat) might be impossible to fully compensate on-site without undermining the project. In such cases, developers should seek off-site habitat of similar type to offset those residual impacts. For example, if a project unavoidably affects a section of ancient hedgerow, they might fund the restoration of hedgerows in the local area to an extent that outweighs the loss.
- Achieving the 10% Net Gain: A development might manage, say, 5% net gain on-site through its restoration efforts but still be short of the mandatory 10% BNG. Off-site units can make up this difference. The BNG metric calculations will show the deficit, and the developer can then acquire the necessary units from the market (many conservation organisations and private providers now offer BNG unit credits for sale).
- Special Cases & Credit Purchase: In rare instances where local off-site units are unavailable or insufficient, a developer may opt to buy government biodiversity credits. This is appropriate only after demonstrating that on-site and local off-site options have been pursued. Credits essentially fund conservation action at the national level. They are intentionally costly to encourage on-site and local solutions first.
Off-site Habitat Selection
When engaging in off-site offsetting, developers should ensure the approach is transparent and follows the “like-for-like or better” rule meaning the off-site habitat should be the same type as impacted or one of higher strategic priority. They will need to submit evidence (often via the Biodiversity Gain Plan) of how many off-site units are secured, where, and how that site will be managed. Planning authorities will look for additionality and long-term security in those arrangements (usually requiring that off-site habitat is registered on the official biodiversity gain site register and that management agreements are in place). Off-site units are appropriate only after clear adherence to avoidance, minimisation, and on-site restoration has been documented. If a project tried to shortcut to offsets without doing everything feasible on-site, it would not meet policy tests and could be refused. Used correctly, off-site offsets are a vital tool to achieve net gain for projects that truly need them they allow flexibility in meeting the 10% requirement while still upholding the integrity of the mitigation hierarchy.
Applying the Hierarchy in Project Design
Applying the BNG mitigation hierarchy is not a one-off task, but a continuous process embedded throughout project design, construction, and long-term management. It begins at concept stage and continues through post-construction monitoring, ensuring environmental compliance at every phase. Early Ecological Impact Assessment (EcIA) is essential to establish baseline conditions, identify potential effects, and guide decisions that avoid and minimise harm from the outset. Many developers now prepare a BNG Strategy during feasibility, outlining how the project will apply the avoid minimise restore offset sequence to achieve measurable biodiversity net gain. Iterative risk assessment models are often used to test design options, comparing impacts and refining layouts to reduce ecological damage. This adaptive approach demonstrates proactive environmental risk management and responsible sustainable land use planning.
During the planning stage, developers must document the hierarchy’s application clearly. The Biodiversity Gain Plan, a key requirement under the BNG regulations 2024, must evidence each step how impacts were avoided, mitigated, restored, and compensated and quantify outcomes using the BNG metric. Many authorities now expect a dedicated Mitigation Hierarchy Statement within the EcIA or Design and Access Statement to show the project’s compliance and biodiversity design principles in action.
On-site, contractors and environmental managers must uphold these measures through the Construction Environmental Management Plan (CEMP). Protected habitats should be fenced and monitored, and mitigation commitments such as seasonal restrictions or lighting controls must be enforced. If monitoring reveals higher-than-expected impacts, further mitigation must be implemented.
By integrating the hierarchy across design and delivery, projects demonstrate accountability, achieve nature-positive design, and deliver sustainable biodiversity outcomes that satisfy regulators and benefit local ecosystems.
Apply the BNG Mitigation Hierarchy to Your Scheme Early
We help developers and planning teams apply the BNG mitigation hierarchy at design stage avoiding and minimising impacts first, then restoring and compensating where necessary to reduce biodiversity unit shortfalls and planning risk.
How ACP Consultants Can Help
At ACP Consultants, we apply the BNG mitigation hierarchy across every stage of project delivery from early feasibility through to construction and long-term monitoring. Our multidisciplinary team of ecologists, planners, and environmental specialists ensures that biodiversity is embedded into design, helping clients achieve measurable biodiversity net gain and full environmental compliance under the BNG regulations 2024.
We begin by identifying ecological constraints through detailed Ecological Impact Assessments (EcIA) and constraints mapping, ensuring impacts are avoided or minimised wherever possible. When on-site enhancement is needed, we design and implement habitat restoration techniques that deliver long-term gains, supported by robust Biodiversity Gain Plans and monitoring frameworks. If residual impacts remain, our consultants can also assist in sourcing off-site biodiversity units or advising on statutory credits, ensuring each project follows the avoid minimise restore offset sequence transparently and effectively.
ACP’s approach combines technical precision with practical design insight. We work closely with developers, architects, and planning authorities to prepare compliant documentation, demonstrate biodiversity design principles, and satisfy policy requirements within tight planning timelines. Our experience across urban, rural, and infrastructure projects ensures that clients not only meet but exceed regulatory expectations delivering developments that are resilient, sustainable, and demonstrably nature positive.
Whether you need help with an early-stage BNG Strategy, a detailed Biodiversity Gain Plan, or ongoing site management advice, ACP can guide you through every step of the BNG mitigation hierarchy to achieve a lasting, measurable legacy for biodiversity.
References and Useful Resources
- Defra & Natural England – Biodiversity Metric: Calculate the biodiversity net gain of a project or development
- Lichfield District Council – Biodiversity Net Gain (BNG) Guidance for Planning Applications
- East Devon District Council – How is Biodiversity Net Gain Measured?
- Defra (July 2025) – The Statutory Biodiversity Metric: User Guide
- North Hertfordshire District Council – How to Measure Biodiversity Net Gain
- Chartered Institute of Ecology and Environmental Management (CIEEM) – Biodiversity Net Gain Case Studies & Good Practice
- CIEEM – Biodiversity Net Gain Report and Audit Templates
- UK Statutory Instruments – The Biodiversity Gain Requirements (Exemptions) Regulations 2024
- Natural England – Habitat Management and Monitoring Plan (HMMP) Template (JP058)
- Defra – Biodiversity Gain Plan: Template and Guidance
- Defra – Guidance: Understanding Biodiversity Net Gain
- Natural England – Biodiversity Net Gain: Where to Start
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Frequently Asked Questions
Applying the BNG mitigation hierarchy often raises detailed questions about how it works in planning, assessment, and design. The following frequently asked questions explain key concepts such as the avoid minimise restore offset sequence, BNG regulations 2024, and related requirements like the Biodiversity Gain Plan and BNG metric. These concise answers provide clarity on policy expectations, technical definitions, and best practice for achieving measurable biodiversity net gain and maintaining full environmental compliance under current UK legislation.
What is included in a BNG Mitigation Hierarchy PDF or Map?
A BNG mitigation hierarchy PDF or map is often required to visually demonstrate how the avoid, minimise, restore, and offset stages have been applied. It should show site boundaries, retained habitats, enhancement areas, and any off-site units, providing transparent evidence of environmental compliance within the planning process.
How does the 2022 update influence the BNG Mitigation Hierarchy?
Since 2022, updates to national guidance have aligned the BNG mitigation hierarchy with the mandatory 10% net gain requirement. Developers must now evidence each stage within the Biodiversity Gain Plan, ensuring early avoidance and measurable biodiversity offsets under the BNG regulations 2024.
What is a BNG Planning Condition?
A BNG planning condition requires approval of a Biodiversity Gain Plan before works begin. It sets out how the hierarchy avoid, minimise, restore, offset will be followed and secured for at least 30 years, ensuring measurable biodiversity net gain.
What does BNG Degradation mean?
BNG degradation occurs when biodiversity value decreases due to poor management or inadequate mitigation. Following the BNG mitigation hierarchy and maintaining long-term monitoring under a Habitat Management and Monitoring Plan (HMMP) prevents degradation and ensures environmental risk management.
What is the Offset Hierarchy?
The offset hierarchy prioritises compensation measures close to the development site, promoting sustainable land use planning and local ecological recovery. Off-site biodiversity units must demonstrate additionality, long-term security, and alignment with biodiversity design principles.
What are BNG Exemptions under the 2024 Regulations?
BNG exemptions include minor works with negligible habitat loss, small self-build homes under 0.5ha, and householder extensions. However, all developments are still encouraged to apply the BNG mitigation hierarchy voluntarily to demonstrate best practice and achieve environmental compliance.
How does the BNG Metric support the Mitigation Hierarchy?
The BNG metric quantifies habitat losses and gains, ensuring that avoidance, minimisation, and restoration measures deliver measurable biodiversity net gain. It also identifies any residual deficit requiring off-site units or credits.
What role does the BNG PPG (Planning Practice Guidance) play?
The BNG PPG provides practical direction for applying the BNG mitigation hierarchy within planning decisions. It explains how to present avoidance, mitigation, restoration, and offset evidence in ecological reports and Biodiversity Gain Plans.
What is the difference between On-Site Restoration and Off-Site Offsetting?
On-site restoration improves biodiversity within the development boundary, while off-site offsetting delivers enhancements elsewhere when space or feasibility is limited. Both are integral to the avoid minimise restore offset sequence and essential to the BNG mitigation hierarchy.
Why is the Mitigation Hierarchy essential for Environmental Compliance?
Following the BNG mitigation hierarchy ensures full environmental compliance with the Environment Act 2021 and BNG regulations 2024. It embeds biodiversity considerations into project design and prevents avoidable ecological harm, demonstrating commitment to nature-positive development.
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- Last Updated:
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Disclaimer: Our content is prepared by ACP Consultants’ in-house specialists and is based on current guidance, standards, and best practice in environmental consultancy. While we make every effort to keep information accurate and up to date, it is provided for general guidance only and should not be relied upon as a substitute for professional advice on specific projects. Planning authorities retain final decision-making powers, and requirements may vary between local authorities and over time. ACP Consultants accepts no liability for any loss arising from reliance on this content without obtaining tailored advice for your project.