Property Developers’ Guide: How Biodiversity Consultancy Prevents Costly Planning Delays

Tim Hobern June 3, 2025

The Cost of Overlooking Biodiversity in Planning For property developers, navigating the planning system has never been more complex—or more dependent on ecological compliance. With the introduction of mandatory Biodiversity Net Gain (BNG) under the Environment Act, biodiversity has moved from a secondary consideration to a legal requirement. Understanding how biodiversity consultancy prevents costly planning delays is now essential knowledge for anyone involved in development projects. BNG is no longer just a box to tick at the end of the planning process; it is an integrated part of how planning permissions are granted. Local planning authorities expect developers to demonstrate how their projects will not only minimise environmental harm but also deliver net gain in biodiversity. This means working with ecological experts early on to ensure a viable biodiversity net gain plan is in place. At Civity, we specialise in managing the coordination of biodiversity consultancy—though we do not carry out ecological fieldwork in-house, we ensure the right specialists are involved at the right time, helping your project stay compliant and on track. Understanding Biodiversity Net Gain (BNG) Biodiversity Net Gain is a planning policy requirement that mandates all new developments in England to leave the natural environment in a measurably better state than it was before. Under the mandatory biodiversity net gain regulations, developers must achieve at least a 10% calculated biodiversity net gain on their development site and/or via off-site biodiversity units. Using the DEFRA biodiversity metric, ecologists assess the existing habitats and ecological features on-site to calculate their current biodiversity value. A biodiversity net gain assessment is then conducted, outlining how the proposed development will improve or replace these natural assets through habitat creation and biodiversity enhancements. Where on-site habitat gains aren’t feasible, the use of biodiversity offsetting at a separate site can balance the books and achieve a net gain for a project overall. This is where the biodiversity consultancy process becomes critical. By interpreting ecological data, applying the mitigation hierarchy, and formulating a compliant BNG strategy, specialists guide the production of a viable biodiversity net gain plan. Without this input, projects risk being stalled by local planning authorities. Early consideration is key to achieving net gain and minimising cost: ensuring a minimal impact in the first place (developing land of low biodiversity value to begin with) is usually the best and easiest way to do this. The Role of Biodiversity Consultancy in Planning Projects A professional ecological consultancy supports developers by providing timely and accurate ecological advice tailored to the planning system. Consultants assess protected species, priority habitats, and the habitats present to inform the biodiversity gain plan. They also advise on habitat strategic significance, ensuring the plan aligns with local nature recovery strategies and is acceptable to the local authority. One essential deliverable is the Preliminary Ecological Appraisal (PEA)—a baseline study that determines the need for further ecological surveys or mitigation measures. These early evaluations help identify constraints and opportunities for biodiversity improvements, reducing the risk of last-minute redesigns or rejections during the planning approval stage. Another key contribution is calculating biodiversity units using the biodiversity metric, which quantifies the net change in biodiversity value before and after development. This data forms the backbone of the net gain plan and informs decisions about whether developers must purchase biodiversity credits, use habitat banks, or deliver on-site biodiversity enhancements. Why Timing Matters: Biodiversity and the Planning System Delays in engaging a biodiversity consultancy can have significant financial consequences. If ecological surveys are not scheduled according to seasonal availability, developers may miss critical survey windows, such as for bats or great crested newts, pushing back their planning timeline by months. For BNG assessments, sites with semi-natural habitats like grassland and woodland often specifically require a survey during the growing season (April-September) or even narrower seasonal windows to capture optimal botanical data. By integrating biodiversity early into the land management and design phase, developers not only comply with biodiversity net gain requirements but also streamline their overall programme. A well-prepared biodiversity net gain strategy shows planners a commitment to environmental responsibility and increases the likelihood of planning permissions being granted without protracted negotiations or costly redesigns. For instance, identifying an area of ancient woodland or discovering a protected species late in the process can result in enforced setbacks, legal challenges, or even denied planning consent. Conversely, addressing ecological factors early allows time for creative solutions that meet both conservation and commercial goals. Off-Site Options and Biodiversity Credits Not every development site has the capacity to support a full 10% net gain on location. In these cases, developers can achieve compliance through off-site biodiversity units or purchase biodiversity credits from approved schemes. These might include habitat banks, conservation covenants, or (as a last resort) working with Natural England to access statutory biodiversity credits. These options must still be reflected in the biodiversity gain plan submitted with your planning application. A qualified ecological consultant will assess the viability of these routes, ensuring that any off-site solution still enhances biodiversity value and aligns with the strategic significance of local natural habitats. The ability to boost biodiversity even when space is limited is a key advantage of a strategic, consultancy-led approach. These professionals guide developers in ensuring their contribution to reversing biodiversity loss is both measurable and meaningful. Avoiding Delays: Biodiversity Consultancy as a Planning Partner In many cases, developers encounter costly planning delays not because of opposition to their project, but because of inadequate or non-compliant ecological documentation. Even a well-designed site can be held up indefinitely if it lacks a clear biodiversity gain plan that meets biodiversity net gain requirements under the Environment Act. Through professional ecological consultancy, developers gain access to expert knowledge of the planning system, local biodiversity priorities, and biodiversity net gain assessment methods. This expertise helps you demonstrate compliance with planning authorities and prevents back-and-forth delays that can derail project timelines and inflate costs. Future Developments: Biodiversity as a Strategic Asset In today’s environmentally conscious planning landscape, biodiversity is not just a compliance issue—it is a marker of quality and resilience in future developments. From integrating green infrastructure to enhancing natural environment assets, developers who treat biodiversity as an asset rather than a constraint are better positioned for long-term success. Well-managed biodiversity enhancements not only improve outcomes for ecological features but also raise the attractiveness and market value of a site. Public support, improved planning approval rates, and alignment with sustainability goals all flow from a strong biodiversity net gain strategy. In this sense, biodiversity consultancy becomes not just a way to avoid problems but a proactive partner in building places that last, adapt to climate change, and deliver measurable benefits to the community and the environment. Invest Early to Save Later For developers, the message is clear: the earlier you engage a biodiversity consultant, the smoother your path to planning permission. Delays, redesigns, or legal complications often arise when biodiversity net gain plans are treated as a last-minute checkbox. A trusted ecological consultancy ensures you comply with biodiversity net gain requirements, avoid unforeseen complications, and show local authorities that your development supports the natural world. At Civity, we help you navigate the process efficiently by connecting you with specialists, managing deliverables, and ensuring your development project proceeds without unnecessary holdups. Biodiversity is not just a regulatory requirement—it’s an investment in the long-term success and sustainability of your site. By embedding ecological thinking into every phase, you not only protect biodiversity but also futureproof your project in an evolving planning landscape.

Beyond Checklists: How a Comprehensive Ecological Survey Protects Your Project and the Planet

Tim Hobern June 3, 2025

In an era defined by rapid environmental change and an escalating biodiversity crisis, going beyond basic environmental checklists is no longer optional. For developers, planners and landowners, a comprehensive ecological survey is not just a regulatory hurdle—it’s a strategic asset for safeguarding both project viability and ecological integrity. At Civity, we undertake on-site species and habitat surveys of our habitat banks ourselves; we also work with a trusted network of specialist ecologists to ensure that the data collected is both scientifically robust and tailored to each of our sites. Good data is critical when surveys feed directly into Biodiversity Net Gain (BNG) planning, compliance, and unit generation. Why Ecology Cannot Be an Afterthought The UN’s Global Assessment Report revealed that nearly one million species face extinction due to human activity. Habitat loss, land use change, invasive species and climate pressures are the driving forces. In this context, understanding biodiversity is not just a planning requirement—it’s a responsibility. Checklists can indicate constraints, but they rarely capture the true ecological character of a site. They can miss critical, less visible factors such as species richness, ecological functionality, and the way wildlife uses your land. A full ecological survey brings those dynamics into focus. How Survey Data Drives Real-World Conservation A thorough ecological survey doesn’t just catalogue species—it generates vital data on ecosystem health, invasive pressures, species interactions, and restoration potential. This data directly informs: Mitigation measures BNG planning Habitat enhancement targets Local Nature Recovery Strategies Conservation funding applications By feeding into wider datasets, well-executed surveys also support national and global biodiversity monitoring. That’s why we ensure all ecological data collection we coordinate adheres to DEFRA’s Biodiversity Metric and Natural England standards, where applicable. The Foundation for Long-Term Adaptive Management Comprehensive ecological surveys also enable adaptive management, responding to ecological change over time. This is crucial for: Delivering BNG over a minimum 30-year period Managing climate risks like drought, flooding or species migration and responding to changes over time Ensuring habitats remain functional and diverse long after project completion At Civity, we help developers embed this thinking early, turning surveys into practical management plans that unlock planning approvals and enhance long-term environmental outcomes. It’s Not Just About Protected Areas Ecological surveys reveal the value of landscapes outside designated zones—hedgerows, watercourses, field margins and buffer strips. Some of these areas may not have legal protection, but they’re vital to ecological networks and BNG unit calculations. Overlooking them can mean missed opportunities for: Habitat banking Off-site BNG delivery Enhancing ecological connectivity Ecosystem services By undertaking holistic and detailed surveys, we ensure these critical features are properly assessed and valued within your BNG strategy. From Local Surveys to Global Impact Global biodiversity goals—from the Convention on Biological Diversity to the UK’s Environmental Improvement Plan—depend on local action. Ecological surveys are where this starts. Whether you’re delivering BNG on-site or looking to register off-site units, high-quality ecological baselines are essential. Civity can help you connect local survey findings to wider environmental goals, from improving habitat quality to supporting nature recovery corridors or meeting carbon and biodiversity double-benefit objectives. Our Role at Civity: Strategy, Oversight and Delivery Confidence We act as a bridge between your project team and ecology professionals, ensuring surveys: Meet regulatory requirements Align with BNG planning. Fit within your development timeline. Contribute to long-term stewardship. We also advise on how survey results can inform Section 106 agreements, Conservation Covenants, and BNG unit generation—helping you meet legal obligations, achieve lucrative funding for your land, and secure planning permissions more efficiently. Engaging the Public, Empowering the Project Transparent ecological data and community engagement go hand-in-hand. Well-communicated survey results help: De-risk planning objections Strengthen stakeholder support Demonstrate environmental leadership Whether your project is urban, rural or mixed-use, we help you use ecological evidence to show meaningful biodiversity outcomes—and to report them credibly. Setting a New Standard for Environmental Responsibility Ecological surveys should do more than tick boxes. Done right, they shape high-integrity, climate-smart projects that deliver lasting biodiversity value. At Civity, we believe development and nature can—and must—coexist. So if you’re at the survey stage of your project, talk to us. Whether you need strategic advice or BNG planning or are looking to acquire or register biodiversity units, we’ll help you translate ecological data into action. Let’s go beyond checklists—together.

Biodiversity Net Gain: What Landowners Need to Know About the New Legal Landscape

Tim Hobern June 3, 2025

Understanding Biodiversity Net Gain Biodiversity Net Gain (BNG) is now a legal requirement across England, transforming how development and land use are approached. For landowners, especially those in rural and peri-urban areas, the BNG framework opens new opportunities and responsibilities. The core principle is simple: any property development must leave biodiversity in a measurably better state than it was before. This is calculated using a statutory biodiversity metric that assesses the pre-development biodiversity value and the proposed post-development enhancements. As part of the Environment Act, mandatory biodiversity net gain applies to most major developments. Local planning authorities require a biodiversity gain plan, which details how projects will achieve at least a 10% net gain in biodiversity. The biodiversity baseline is crucial, determined by measuring the existing habitat and ecological value of the development site before any work begins. The Role of Landowners in the New Legal Landscape Landowners now play a pivotal role in helping developers meet BNG requirements. This often involves offering land for off-site biodiversity units where on-site gains cannot be fully achieved. Land that provides suitable habitat creation and management can be registered as a biodiversity gain site on the National Biodiversity Gain Site register. This is where landowners can directly contribute to sustainable development practices while establishing long-term revenue streams. Providing biodiversity units through habitat banks or individual agreements allows landowners to sell units to developers in need of off-site gains. These units are calculated using standardised biodiversity metrics, ensuring consistency in how biodiversity value is assessed across different sites. This helps developers comply with the mitigation hierarchy while ensuring that real ecological value is delivered. Off-Site Biodiversity Units and Credits Off-site biodiversity is a key aspect of the BNG strategy, particularly for projects with limited space or ecological capacity on site. In such cases, developers must seek off-site biodiversity gains to meet their net gain obligations. Landowners offering off-site BNG options must enter into legal agreements, such as conservation covenants with a responsible body. These ensure long-term habitat management and protection. In circumstances where neither on-site nor off-site gains are feasible and no private marketplace BNG options are available, statutory biodiversity credits may be purchased by developers from Natural England. However, this is intended as a last resort in the biodiversity gain hierarchy. Off-site habitat creation led by private landowners remains a preferred option because it often delivers more targeted and locally beneficial outcomes. Legal Framework and Key Considerations The legal framework underpinning BNG includes several key components that landowners should be aware of. The Environment Act, biodiversity gain site register, and statutory biodiversity metric provide the foundation. Any biodiversity enhancements offered as part of a gain plan must be secured by a legal agreement (e.g. Conservation Covenant) that demonstrates a long-term commitment to habitat enhancements and maintenance. A responsible body, such as a local authority or conservation organisation, oversees compliance with conservation covenants. For landowners, this means a clear and enforceable obligation to manage and maintain the habitat to the agreed standard. These measures provide developers and planning authorities with the assurance they need to approve projects with confidence. Developers purchasing biodiversity units must provide full details of the purchase agreement in a Biodiversity Gain Plan. Local planning authorities will scrutinise all biodiversity gain plans during the planning permission process. This includes evaluating whether the unit provider has satisfied all the necessary legal requirements and due diligence checks to operate as such. Opportunities for Landowners and Land Managers For landowners and land managers, BNG can offer a valuable and sustainable income stream. Habitat banks and direct provision of biodiversity units can become a central part of a land management strategy. By considering BNG habitats on their land, landowners can market their sites to developers undertaking major developments, including nationally significant infrastructure projects. This allows landowners to secure lucrative and guaranteed long-term income on their land; this income is well in excess of usual yield-based incomes and completely independent of the impacts of variables like weather that usually add uncertainty to yield-based income streams. Engaging with BNG on your land also aligns with broader goals of enhancing habitats and improving ecological services. Off-site habitat creation not only meets the requirements of biodiversity net gain but also contributes to improved soil health, water retention, and climate resilience. These benefits enhance the long-term health of the land while supporting the natural environment. Investing in suitable habitat creation is a tangible way to support wildlife habitats and protect the ecological value of rural and semi-rural areas. Whether restoring hedgerows, rewilding wetland corridors, or reinstating grassland, landowners can tailor their biodiversity gain strategies to local environmental needs and conditions. Navigating the Planning System and Gaining Approval To participate effectively in the BNG framework, landowners must understand how to work within the planning system and/or with a responsible body. Local authorities and responsible bodies are looking for clarity, accountability, and long-term ecological viability in any proposed off-site biodiversity unit. Civity guides landowners and land managers through this process from start to finish. Civity are experts at producing site-specific and robust Habitat Management and Monitoring Plans (HMMP). An effective HMMP is vital to clearly demonstrate how the site will deliver net gain through habitat management. It must reference the biodiversity baseline, specify habitat types, and detail long-term management and monitoring plans. This document is essential to achieving registration on the BNG register and ensuring the responsible delivery of biodiversity gain. The integration of BNG into the planning process means that all stakeholders—developers, landowners, local authorities, and conservation bodies—must collaborate more closely. By aligning the goals of development with nature conservation, the system aims to create more resilient and biodiverse landscapes. Conclusion: The Future of Land Use and Biodiversity Net Gain The introduction of mandatory biodiversity net gain is reshaping the way land is managed, developed, and protected in England. Landowners are no longer on the periphery of the planning system but are now essential partners in delivering ecological improvements. The new legal landscape offers not only regulatory challenges but also exciting opportunities to enhance biodiversity, support sustainable development practices, and create lasting environmental and economic value. By providing biodiversity units, engaging in suitable habitat creation, and managing land for ecological value, landowners are helping to meet the goals set out in the Environment Act and the wider environmental agenda. As the system matures, the biodiversity gain site register, statutory biodiversity credits, and conservation covenants will continue to evolve, offering new mechanisms for landowners to contribute to and benefit from the biodiversity net gain system. For landowners committed to sustainable and responsible land management, this is a pivotal moment. Civity is a specialist biodiversity consultancy helping developers and landowners navigate Biodiversity Net Gain requirements with expert guidance and strategic support. With careful planning, expert advice, and a commitment to ecological value, BNG can become a central part of your land management strategy and a legacy for the natural environment.

BNG Credits Explained: What Developers Need to Know About Achieving 10% Net Gain

Tim Hobern May 29, 2025

As mandatory Biodiversity Net Gain (BNG) is in planning law across England, developers face increasing pressure to understand and comply with its core components. One of the most crucial—and often misunderstood—aspects is how to meet the required 10% net gain in biodiversity. This blog demystifies the role of BNG credits, off-site solutions, BNG units and the full spectrum of options available to achieve compliance. This is your definitive guide to “BNG Credits Explained: What Developers Need to Know About Achieving 10% Net Gain“, covering the tools, terminology, legal routes, and best practices that developers must understand to deliver biodiversity gains both on site and off site. The Goal: Achieve 10% Biodiversity Net Gain Under the Environment Act, all eligible development projects must demonstrate a minimum 10% uplift in biodiversity value compared to the pre-development biodiversity baseline. This uplift can be achieved through on-site habitat creation and off-site biodiversity gains either via purchase of BNG units or delivery of habitat off-site, or—when no other options exist—statutory biodiversity credits. This requirement applies to: Major developments (from February 2024) Small sites (from April 2024) Nationally Significant Infrastructure Projects (expected implementation from November 2025) What Are BNG Credits? BNG credits refer to statutory biodiversity credits offered by the UK government. These are a last-resort mechanism developers can purchase when they cannot secure sufficient biodiversity units through on-site or off-site measures. But BNG credits are just one part of a broader solution that also includes: Site biodiversity gains (created within the red line boundary) Off-site habitat creation/enhancement to deliver units (secured on other land) Biodiversity units purchased from a registered biodiversity gain site (listed on Natural England’s Biodiversity Gain Sites Register) Understanding Biodiversity Units and Metrics The basis for any BNG calculation is the statutory biodiversity metric, which uses habitat type, size, condition, and location to assess the biodiversity value of a site. The latest statutory biodiversity metric tool calculates how many biodiversity units a site starts with and how many it delivers after development. Using the standardised biodiversity metric, developers can: Measure existing habitat and any habitat lost Assess the impact of the proposed development on existing biodiversity Quantify planned habitat creation or enhance habitat interventions Determine any shortfall between gains and the mandatory 10% The Biodiversity Gain Hierarchy Meeting BNG obligations must follow the biodiversity gain hierarchy, a structured process that prioritises sustainable and ecologically beneficial outcomes: Avoid biodiversity loss where possible Minimise unavoidable losses Restore biodiversity on site Secure off-site biodiversity gains Buy statutory biodiversity credits (only as a last resort) Following this hierarchy is not optional. Local Planning Authorities (LPAS) expect to see evidence that developers have pursued significant on-site gains and suitable off-site units before purchasing statutory credits. On-Site vs. Off-Site Gains Achieving BNG On Site On-site solutions are often preferred, especially for developments with adequate space for suitable habitat creation or biodiversity enhancements. Benefits include: Direct control over habitat management Alignment with the site’s design and post-development landscape Stronger connection with local communities and the site’s biodiversity However, on-site gains are not always viable, especially where: Development density is high High-scoring habitats are impacted The red line boundary limits the available space Securing Off-Site Gains When biodiversity cannot be fully addressed on site, developers may: Enhance biodiversity on your own land outside the red line Purchase off-site biodiversity units from land managers, brokers, registered habitat banks, or BNG sites listed on the official register or purchase Statutory Biodiversity Credits from the government (as a last resort). To be valid, these off-site gains must: Be registered on the Biodiversity Gain Sites Register Be secured via a legal agreement (such as a conservation covenant or Section 106) Deliver gains calculated using the statutory biodiversity metric formula. You will need to discuss with a provider to check when their site will be registered and ensure this timeline aligns with when you require the units. When to Buy Statutory Biodiversity Credits Buying statutory biodiversity credits is a viable option only when: You can’t secure or manage gains on your own land On-site options have been exhausted per the biodiversity gain hierarchy There are no suitable off-site biodiversity gains available Natural England is selling statutory credits on behalf of the Department for Environment, Food and Rural Affairs (DEFRA). Funds from the sale of statutory credits will be invested in habitat creation or enhancement. That said, credits: More expensive than market-based biodiversity units Do not generate site-specific ecological value as they are not necessarily to be delivered close to the development site Considered less favourable by LPAs Legal Requirements for BNG Credits and Off-Site Units Whether you’re securing off-site units or purchasing BNG credits, the arrangements must be legally binding and fully documented. This includes: A clear biodiversity gain plan Confirmation that the site or credits are registered Alignment with the mandatory biodiversity net gain standards The Role of Local Planning Authorities Local authorities play a critical role in verifying BNG compliance. They will: Review your planning permission application for BNG completeness Evaluate your biodiversity gain site or off-site BNG source Check that your use of statutory credits follows the rules Early engagement with the relevant planning authority helps streamline the process and avoids costly delays. How to Demonstrate BNG in Practice To support your application, your BNG documentation should include: A baseline biodiversity assessment using the statutory biodiversity metric tool Details of proposed habitat creation or enhancements Identification of any habitat lost Explanation of on-site and off-site delivery options Confirmation of any BNG units purchased or credits used All figures must be grounded in measuring biodiversity using standardised tools. Choosing the Right Off-Site Provider Not all off-site providers are created equal. Choose a partner who can: Offer legally compliant, registered biodiversity gain sites . If not yet registered, ensure they can provide a timeline for when full unit sales will be available Provide clear information on how many biodiversity units are available Align their sites with the biodiversity metric and habitat types needed for your offset (i.e. your trading requirements are met) Deliver habitat creation projects with robust long-term land management Key Considerations When Buying BNG Credits Credits typically come at a premium cost compared to equivalent off-site units You need to demonstrate you’ve thoroughly explored all alternative options first Local Planning Authorities and Natural England require robust justification for pursuing the credit purchase route While credits support broad habitat creation at a landscape scale, they may not directly benefit or connect with the biodiversity specific to your development area FAQS: BNG Credits and Units How many biodiversity units do I need? This depends on your pre-development biodiversity value and the calculated loss vs. gain. The statutory biodiversity metric provides exact figures. If buying BNG units, the number of units you need to buy will depend on the location of your development in relation to the location of the habitat bank. For every 1 biodiversity unit you require, you will need to buy 2 biodiversity credits! Can I split gains between on-site and off-site? Yes. Many developers use a combined on-site/off-site approach to balance feasibility and compliance. Are statutory credits always accepted? Only if you’ve met the conditions of the biodiversity gain hierarchy can you show there are no practical alternatives. Final Thoughts Delivering 10% biodiversity net gain is not just a planning hurdle—it’s an opportunity to make development projects more resilient, responsible, and nature-positive. Understanding when and how to use BNG credits and when to pursue off-site biodiversity units is essential for both legal compliance and ecological credibility. At Civity, our role is to review the metric and provide the right types and numbers of units. Need help assessing your site or sourcing BNG units? Contact the Civity team or explore our landbank for reliable, register-ready off-site biodiversity gains.

Understanding Statutory Biodiversity Metrics: Tools and Resources Explained

Tim Hobern May 28, 2025

Understanding how to measure biodiversity accurately is fundamental to achieving compliance with the Biodiversity Net Gain (BNG) requirements set out under the Environment Act. At the centre of this process is the statutory biodiversity metric—a tool that helps assess the biodiversity value of a development site, evaluate potential biodiversity loss, and calculate the biodiversity gain required to meet the legal threshold. In this guide to “Understanding Statutory Biodiversity Metrics: Tools and Resources Explained,” we demystify the tools, terminology, and processes involved in BNG measurement—and highlight where developers, landowners, and planners can find the support they need. What Is the Statutory Biodiversity Metric? The statutory biodiversity metric is the government-approved method for calculating changes in biodiversity caused by a development. It is a requirement for all planning applications subject to BNG and is managed by DEFRA. The metric assesses both pre- and post-development habitat conditions based on: Habitat type (e.g., grassland, woodland, wetland) Habitat distinctiveness Habitat condition Size (in hectares or kilometres for linear habitats) Strategic significance (e.g., local biodiversity importance) Each component feeds into a metric calculation tool, producing results in biodiversity units—the standard currency for net gain. Why Biodiversity Metrics Matter The biodiversity net gain metric is more than just a calculation—it’s the bridge between policy and practical outcomes. Using the statutory metric ensures that: Habitat losses are properly accounted for by equivalent or better gains Biodiversity enhancements are measurable and trackable over time Local planning authorities (LPAs) can fairly assess the value of development sites BNG targets are consistent across all development projects The Key Tools Available A developer may own additional land (off-site) which can be used to deliver the biodiversity units upon. This land will need to be managed and monitored for 30 years. The landowner/developer will be responsible for the delivery of these units. 1. Statutory Biodiversity Metric Tool This is the core tool for all major developments. It calculates biodiversity units for: Area habitats (e.g., meadows, arable fields, woodland, scrub, etc.) Linear habitats (e.g., hedgerows, treelines) River units (rivers and streams) 2. Small Sites Metric Tailored for small sites, i.e., not applications which qualify as major development or are discounted from the use of this metric (e.g. priority habitats, protected species or protected sites on the site). A small site/non-major development is defined as residential development where the number of dwellings is between 1 and 9 on a site of an area 1 hectare or less, or if the number of dwellings is unknown, the site area is less than 0.5 hectares. Or Commercial development where floor space created is less than 1,000 squares metres or total site area is less than 1 hectare. 3. Habitat Assessment On all sites where the Statutory Biodiversity Metric needs to be used, habitats will need to be assessed using UKHab Classification. Surveyors use this classification system to identify and classify the habitats on site. This translates to the ‘habitat type’ in the metric. The relevant condition assessment sheet will need to be used to determine how good/poor this example of a habitat type is. For example, it is degraded,species-poor, or riddled with invasive or undesirable species. These resources support the accurate evaluation of a habitat’s distinctiveness and condition, which are essential for determining the overall biodiversity value. Rivers, if impacted, will require their own bespoke River Condition Assessment, which will need to be undertaken by an RCA-accredited surveyor. How the Biodiversity Metric Calculation Tool Works The biodiversity metric calculation tool uses a habitat-based approach to evaluate biodiversity net gain (BNG). It then generates the number of biodiversity units lost and gained, accounting for time delays in habitat maturation and the difficulty of certain enhancements. To pass BNG requirements, the biodiversity gain must exceed the net loss by at least 10%. Data Collection and Assessment Accurate data collection is critical to the effective use of the biodiversity metric tool. This typically involves: An assessment of the habitats on site and the condition (e.g. UKHabs survey and condition assessment) Soil sampling may be relevant to guide habitat proposals GIS mapping to account for the areas of habitats retained, lost and enhanced This information will then be assimilated into the Statutory Biodiversity Metric A qualified ecologist should complete or validate the inputs to ensure the statutory biodiversity metric calculation is robust and acceptable to the relevant planning authority. If a Small Sites Metric can be used, it can be undertaken by a ‘competent person’. Legal Requirements and the Planning Process The BNG requirement is now a legal requirement under the Environment Act and affects all eligible planning applications in England. Developers must submit a biodiversity statement to say if the BNG requirement applies to their project. If so, upon receipt of permission and a requirement to discharge the BNG condition, a biodiversity gain plan will need to be submitted. This will need to be accompanied by all other relevant documents, e.g., the completed metric, habitat management, and monitoring plan. The biodiversity gain plan must demonstrate a measurable net gain using the appropriate metric. LPAs must verify the outcome and ensure it aligns with statutory guidelines. On-Site, Off-Site, and Last Resort Options If net gain cannot be delivered on site, developers can: Secure gains on other land under their control Work with an off-site provider to purchase units As a last resort, buy statutory credits from the UK Government The biodiversity metric helps evaluate all options consistently and transparently. Civity’s Role in Biodiversity Metric Support At Civity, we help clients: Understand the metric trading rules and apply metric trading to ensure we provide you with the right types and numbers of units Review your biodiversity gain plan Work with LPAs and your consultant ecologist One of our key roles is to supply off-site units for developers who cannot meet the net gain on site. Key Considerations for Developers and Land Managers Use the correct metric version for your site size Engage with ecologists and local authorities early in the planning process Base your inputs on verified ecological surveys Remember that enhancing biodiversity involves long-term land management Keep accurate records to comply with post-development monitoring Looking Ahead The UK Government has committed to embedding BNG in the planning system, and the statutory metric is a critical part of that process. As pressure grows to respond and reverse biodiversity decline, using the metric correctly can: Accurately account for the habitats on site Help restore natural habitats Deliver better outcomes for local biodiversity Support resilient, nature-positive development across England Final Thoughts The statutory biodiversity metric is a powerful, evidence-based tool that translates ecological knowledge into practical planning outcomes. Understanding how to use it—and where to find guidance—puts developers and landowners in a stronger position to succeed in the evolving world of biodiversity net gain (BNG). The responsibility of undertaking this assessment is often the role of a consultant ecologist, but it’s great to get ahead of the game and understand how it works! At Civity, we’re here to help you navigate the tools, avoid the pitfalls, and build the ecological and planning confidence needed to deliver measurable biodiversity enhancements. Contact the Civity team for expert help with the biodiversity metric calculation tool, preparing a BNG plan, or sourcing biodiversity units. Learn more or contact us directly for tailored guidance.

hello@civitynge.com

0208 050 6076

hello@civitynge.com

0208 050 6076

CIVITY NGE Blog

Property Developers’ Guide: How Biodiversity Consultancy Prevents Costly Planning Delays

Beyond Checklists: How a Comprehensive Ecological Survey Protects Your Project and the Planet

Biodiversity Net Gain: What Landowners Need to Know About the New Legal Landscape

BNG Credits Explained: What Developers Need to Know About Achieving 10% Net Gain

Understanding Statutory Biodiversity Metrics: Tools and Resources Explained

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