Biodiversity Net Gain Surveys & Consultants: BNG in England
At ACP we provided consulting services for BNG in England. We specialise in biodiversity net gain (BNG) surveys with consultants based in England to provide expert guidance across the country to help projects align with the new regulatory regime for BNG in England.
Whether you’re looking to commission a full BNG assessment, deliver a Habitat Management & Monitoring Plan or integrate the latest calculations using the Statutory Biodiversity Metric (formerly Biodiversity Metric 4.0), our team delivers clarity and compliance.
From initial baseline habitat audits through to long-term monitoring, our goal is to ensure your development leaves nature in a measurably better state. Request a BNG Assessment today.
- Our Biodiversity Net Gain (BNG) Services in England:
- BNG baseline habitat surveys (Metric 4.0 compliant)
- Biodiversity unit calculations & deficit analysis
- Habitat creation, enhancement & on-site mitigation design
- Biodiversity Gain Plans (BGP) for planning submission
- Off-site BNG strategy & unit sourcing advice
- Habitat Management & Monitoring Plans (HMMP)
- Pre-application BNG feasibility & risk reviews
- Planning condition discharge & post-consent support
We follow a simple, transparent process to ensure your project runs smoothly from the very first contact to the final report. Our approach is designed to provide you with clarity at every step, so you’re fully informed and confident in moving forward.
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Step 1: Request a Quote
Fill out our quick quote form or call us, and our team will provide a free, no-obligation quote, outlining the services tailored to your needs.
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Step 2: Confirm Your Booking
Once you approve the quote, simply return the booking form. We’ll schedule your survey and ensure all the details are taken care of.
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Step 3: Receive Your Report
After your survey is completed and payment is received, we’ll promptly issue your survey report, ensuring you get the results as quickly as possible.
In the past year, we’ve delivered over 750+ audit-ready reports supporting 400+ projects for developers, planners, and architects nationwide. We put quality over quantity and build lasting relationships based on trust, ensuring your planning applications are backed by robust evidence and delivered on time.
What is Biodiversity Net Gain: BNG in England?
The concept of biodiversity net gain (BNG) refers to the requirement that development leaves the natural environment in a better condition than it was before. In England this has become a mainstream part of planning policy: new developments must consider not just avoiding and mitigating ecological harm but delivering measurable gains in habitat value and connectivity. The primary keyword “BNG in England” underpins the service we offer, full-scale ecological audits, surveys of habitat and species, and consultancy support to deliver BNG obligations.
For BNG in England, the expectation is that development proposals will adopt a more strategic, landscape-scale mindset. That Includes, considering green infrastructure planning, ecological footprint reduction and tying surveys into the wider environmental management systems of site and locality. For land-use change, residential or commercial, the assessment must account for pre-impact baseline habitat value, post-development habitat creation or enhancement, and monitoring over time. This baseline and future gain must be calculated using the approved metric tool, and the results presented to the local planning authority (LPA) via supporting documentation such as a biodiversity gain plan or habitat management plan.
In practical terms, our role as BNG consultants is to guide clients from inception (site screening and ecology scoping) through to final calculation of biodiversity units, the drafting of legal agreements (such as S106 or habitat banking arrangements) and ongoing monitoring. We ensure the surveys underpinning the BNG submission align with prevailing policy and site-specific context, for example whether the site contains priority habitats, ancient woodland or is within a sensitive corridor. This approach enables developers and landowners to meet regulatory expectations while securing planning permission and delivering long-term biodiversity benefits.
Environment Act 2021 and Local BNG Policy: BNG in England
The legislative framework for biodiversity net gain in England has been shaped significantly by the Environment Act 2021, which introduced mandatory BNG as part of the planning system. Under the Act, most developments must demonstrate a minimum 10% net gain in biodiversity value, calculate gains using the statutory metric and secure habitat management for at least 30 years.
Local planning authorities in England have adapted their validation checklists and local plans to reflect BNG requirements for example requiring submission of a biodiversity gain plan, habitat management agreement, ecology surveys (including flora and fauna surveys), and referencing green infrastructure planning in proposals. Many LPAs now include specific conditions tied to BNG in decision notices and link the assessment and monitoring arrangements to environmental management systems on site. Developers and consultants must therefore ensure that their BNG submission aligns not just with national guidance, but with local plan policy, validation checklists, and any supplementary planning documents.
A key point is that the local policy context can affect matters such as off-site habitat provision, trading rules for biodiversity units and strategic delivery of mitigation or enhancement through local nature recovery networks. In some cases, local planning authorities will expect the BNG surveys and consultancy to engage with local nature recovery strategies, local habitat banks or biodiversity credit providers. As part of our service, we tailor our consultancy to reflect that local nuance ensuring that the surveys, metric calculations and subsequent habitat delivery are consistent with both national requirements and local expectations.
Using DEFRA’s Statutory Biodiversity Metric 4.0
Effective delivery of biodiversity net gain in England requires robust measurement. The statutory biodiversity metric tool superseding earlier versions such as the biodiversity metric 4.0 has been published and its use is mandatory for assessing the biodiversity gain or loss of development proposals. The tool uses habitat type, condition, distinctiveness, strategic significance, spatial risk and other multipliers to calculate biodiversity units.
For example, the metric requires that existing habitats are surveyed for condition; that the proposed enhancements or creation of habitats are quantified; and that any off-site units used (if on-site habitat creation is not feasible) are properly accounted for. The metric also embeds trading rules and guidance on irreplaceable habitats and strategic significance.
When we act as BNG consultants, we work through the metric from first principles: habitat baseline surveys (including desk study, flora and fauna surveys where required), calculation of present biodiversity units, prediction of post-development units, checking of delivery timescales and risk multipliers, and, finally, presentation of results in a format accepted by the LPA. We also advise on habitat management and monitoring, off-site options, and how to tie this into the legal agreements (which may include long-term management funds, monitoring schedules, and triggers for habitat delivery). That way, you are fully compliant with the metric requirements and local planning policy.
ACP’s Role and BNG Services: BNG in England
At ACP Consultants we provide end-to-end consultancy for biodiversity net gain across England from initial surveys through to long-term monitoring and compliance. Our team of ecologists, environmental planners and habitat specialists ensure your development meets both the letter and spirit of the BNG requirements. The broad service includes:
- Baseline ecological and habitat surveys (including flora and fauna surveys) to underpin the BNG submission.
- Full metric calculations using the statutory biodiversity metric (or earlier versions if appropriate) to show current biodiversity units and predicted gains.
- Preparation of biodiversity gain plans, habitat management and monitoring plans (HMMPs), legal agreement support (off-site credits, habitat banking, S106) and green infrastructure planning guidance.
- Delivery advice: on-site habitat creation/enhancement, selection of off-site units or biodiversity credits, linkage to local nature recovery strategies, planning submission support and post-consent monitoring.
- Liaison with local planning authorities and design teams to integrate BNG into the broader environmental management systems of your project, ensuring compliant, deliverable outcomes that reduce planning risk and deliver ecological value.
By engaging our BNG survey and consultancy services early in the development process you benefit from commercially pragmatic advice we align ecological ambition with cost-effective delivery, helping you to avoid delays and additional cost through retrospective corrections. Speak to a BNG Consultant now to discuss your project needs for BNG in England.
Biodiversity Net Gain Surveys and Consultants: BNG in England Reviews
Many developers and landowners now seek confirmation that their BNG provider has experience in delivering credible surveys and consultancy across England. Reviews consistently highlight that the best BNG consultants not only deliver robust metric calculations, but also understand how to integrate green infrastructure planning, ecological restoration services, and environmental management systems into the design process. As a specialist consultancy covering the national hub, ACP Consultants has been praised for its ability to deliver practical habitat creation plans, coherent monitoring frameworks, and clear communication with LPAs. If you are looking to engage with a consultant rated for BNG survey cost transparency, metric expertise, and full lifecycle delivery then we are here to assist.
BNG Survey Cost
When considering BNG survey cost for developments across England, clients should be aware that price is influenced by site size, habitat complexity, need for full flora and fauna surveys, degree of off-site habitat delivery and monitoring length. A simple baseline habitat survey for a greenfield site may be straightforward, but projects involving priority habitats, protected species, or off-site unit trading will require more detailed consultancy input and hence higher cost. ACP Consultants offer transparent costings early in the process, aligned to your proposed scope of works, enabling you to budget with confidence and avoid hidden budget risks.
Biodiversity Net Gain Assessment
A biodiversity net gain assessment is the formal process of establishing the initial biodiversity units, modelling the post-development scenario and confirming that the minimum 10% net gain (or higher if local policy demands) will be achieved and maintained for the required duration (commonly 30 years). Our assessments are structured in line with current guidance, referencing the statutory biodiversity metric, habitat management and monitoring plans, trading rules, and the legal framework. We work to ensure your assessment is fully defensible, accepted by the LPA and integrated into your planning delivery.
Biodiversity Net Gain Survey
A biodiversity net gain assessment is the formal process of establishing the initial biodiversity units, modelling the post-development scenario and confirming that the minimum 10% net gain (or higher if local policy demands) will be achieved and maintained for the required duration (commonly 30 years). Our assessments are structured in line with current guidance, referencing the statutory biodiversity metric, habitat management and monitoring plans, trading rules, and the legal framework. We work to ensure your assessment is fully defensible, accepted by the LPA and integrated into your planning delivery.
Get a Planning-Ready Biodiversity Net Gain Assessment for BNG in England
We deliver fully compliant BNG assessments aligned with local authority validation requirements, supporting smooth determination and reduced planning delays.
BNG Ecologist in England
BNG ecologists in England play a critical role in delivering compliant and measurable Biodiversity Net Gain (BNG) outcomes across a wide range of development projects. With the introduction of the Environment Act 2021 and the mandatory use of the Statutory Biodiversity Metric (formerly Biodiversity Metric 4.0), the role of a specialist BNG ecologist has evolved beyond traditional ecological surveying to include metric calculations, strategic habitat planning, and long-term monitoring.
Across England, ecological requirements vary significantly by region. In the South East and London, pressure on land means that achieving on-site biodiversity net gain can be challenging, often requiring off-site units or habitat banking solutions. In contrast, regions such as the Midlands and North of England may offer greater opportunities for on-site habitat creation, although local planning authorities still expect strong alignment with Local Nature Recovery Strategies (LNRS). Coastal regions, including the South West and East Anglia, often involve sensitive habitats such as wetlands, saltmarsh, and chalk grassland, requiring careful condition assessment and habitat-specific expertise.
A competent BNG ecologist must therefore understand not only the DEFRA metric and Natural England guidance, but also regional ecological priorities, local planning policies, and habitat constraints. This includes identifying priority habitats, assessing condition accurately, applying spatial and temporal risk multipliers, and ensuring that biodiversity units are deliverable over the required 30-year management period.
At ACP Consultants, our BNG ecologists operate across England, providing consistent yet locally tailored support. From baseline habitat surveys and biodiversity metric calculations to habitat management plans and off-site unit sourcing, we ensure that each project meets both national requirements and regional expectations—delivering robust, policy-compliant, and ecologically meaningful outcomes.
Biodiversity Net Gain Criticism
While the BNG regime represents a major step forward, some criticism has emerged: concerns that metrics may oversimplify biodiversity value by focusing on habitat ‘units’ rather than species richness, that off-site trading might reduce local ecological benefit, or that the minimum 10% net gain may be insufficient for highly sensitive sites. In our role, we address such issues by recommending higher net gain margins where local context demands, ensuring enhancement quality is high, and ensuring off-site solutions are genuinely deliverable and ecologically coherent. Engaging a competent consultant helps you not just tick a box but deliver meaningful ecological improvement.
Biodiversity Net Gain Report
The preparation of your biodiversity net gain report is the culmination of survey work, metric calculation, habitat management plan and monitoring schedule. It becomes a core part of your planning submission, guides your on-site or off-site delivery and forms the basis for S106 or other legal agreement compliance. ACP Consultants produce report packages that are clear, concise, referenced to statutory guidance and structured for planning officer review saving you time and avoiding unnecessary iterations.
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
- Defra & Natural England – Biodiversity Metric: Calculate the biodiversity net gain of a project or development.
- Department for Environment, Food & Rural Affairs (Defra) – Calculate biodiversity value with the statutory biodiversity metric guidance.
- Natural England – Statutory Biodiversity Metric User Guide, providing technical instruction on applying the metric correctly.
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Frequently Asked Questions
Understanding Biodiversity Net Gain (BNG) in England is essential for developers, landowners, and planning professionals working under the Environment Act 2021.
BNG is now a statutory requirement across England. Most developments must achieve a minimum 10% biodiversity net gain, calculated using the statutory Biodiversity Metric 4.0. The process can appear complex, particularly when navigating national rules and local planning requirements.
This FAQ section answers common questions about BNG in England, including how biodiversity units are calculated, what the 10% net gain requirement means, and how compliance is demonstrated through the planning system.
Guidance is provided on preparing a compliant Biodiversity Gain Plan and understanding how BNG applies in practice across England. All answers are written in clear, plain language.
What is the difference between a biodiversity net gain survey and a biodiversity net gain assessment?
A biodiversity net gain survey refers to the site appraisal work mapping habitats, conducting desk studies and surveys of flora and fauna, assessing baseline conditions, strategic significance and constraints. A biodiversity net gain assessment takes the survey data and models how the development will change habitats, calculates pre- and post-development biodiversity units using the metric tool, assesses whether the 10% (or higher) net gain target is met, and sets out habitat creation/enhancement and monitoring plans. Engaging a consultant for both ensures consistency and compliance.
When does BNG apply and how does local policy affect it?
The BNG requirement in England applies under the Environment Act 2021 for most developments, subject to thresholds and exemptions. Local planning authorities may have validation checklist requirements, expect off-site units or habitat banking, or require a higher net gain percentage depending on ecological sensitivity. Consultants must therefore interpret both the national framework and local policy. Early community engagement and scoping will help you understand if any additional local nature recovery or green infrastructure planning issues apply.
What happens if the biodiversity Net Gain target is not met?
If your calculation shows that the post-development biodiversity units fall short of the required net gain (minimum 10% as per the statutory metric), you may need to revise your design, increase on-site habitat creation, source off-site credits or purchase biodiversity units via a habitat bank. Under the metric rules, you cannot simply offset irreparable habitats you must follow trading rules, address strategic significance, and ensure habitat management. A consultant will advise on remedial options and ensure your planning submission remains viable.
How long must the habitats created or enhanced as part of BNG be secured for?
The national guidance states that habitat created or enhanced to deliver BNG must be secured for a minimum of 30 years, typically via a legal agreement, management plan and monitoring schedule. The habitat management and monitoring plan (HMMP) forms part of the delivery and the BNG consultant should prepare this and advise on mechanisms to secure funding and responsibilities over the long-term.
Is biodiversity offsetting still allowed under BNG?
Under the regime in England, biodiversity offsetting is controlled by the statutory lifecycle of the metric, and off-site habitat units (sometimes termed biodiversity credits) may be used where on-site gains are not possible. However, the offsetting must comply with the trading rules within the metric, maintain habitat like-for-like or better, and integrate with local nature recovery strategies. Simply paying a sum without credible ecological delivery is not sufficient. A competent BNG consultant will help structure the arrangements properly.
How does the habitat management and monitoring plan (HMMP) feature in a BNG submission?
The HMMP addresses how the habitats that deliver the net gain will be managed, monitored and secured over the 30-year period. It links the survey/assessment to practical delivery and LPA compliance. The plan will set out objectives, responsibilities, timelines, monitoring indicators, contingency measures, and trigger points (for example if habitat fails to establish). Without a credible HMMP, the BNG calculation may not be accepted by the LPA. As such, engaging an experienced consultancy is critical to ensure the HMMP aligns with both national and local planning requirements.
What national BNG guidance applies in England and where do I find it?
England follows national BNG guidance published by DEFRA and Natural England, including the Statutory Biodiversity Metric user guide, biodiversity gain plan requirements, and HMMP expectations. Local planning authorities also issue validation checklists that sit beneath this national framework. If you need a single point of reference for biodiversity net gain England, we’ll signpost the core national documents and any relevant local SPD so your submission aligns with both.
How do I choose BNG consultants England, wide for complex schemes?
Look for demonstrable experience with the Statutory Metric, trading rules, off-site units, and long-term management. As BNG consultants England developers trust, we integrate survey, metric, legal pathways, and delivery so your biodiversity net gain plan is robust, defensible and practical to implement across regions.
How do environmental management systems support BNG and sustainable development planning?
An environmental management system (EMS) provides the structure for monitoring targets, roles, data and corrective actions over 30 years. Coupled with sustainable development planning, it hard-wires BNG objectives into procurement, landscape maintenance and reporting reducing risk of non-compliance and ensuring your habitats establish as predicted.
Do I need ecological impact assessments alongside BNG and how does green infrastructure planning fit in?
Many projects benefit from ecological impact assessments (EcIA) to understand effects on species and designated sites, while BNG addresses quantified habitat change. Green infrastructure planning then translates both into deliverable designs linking habitat creation, drainage, access and long-term management so your statutory BNG and wider ecology objectives reinforce each other.
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- Last Updated:
- April 2026
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.