Biodiversity Net Gain (BNG) for Local Authorities: Complete Guide & Best Practices
BNG for local authorities is a statutory requirement that places local planning authorities (LPAs) at the heart of England’s biodiversity recovery agenda.
This guide provides a clear overview of how councils must apply BNG regulations, meet LPA BNG requirements, and use planning BNG guidance to ensure development delivers measurable improvements for nature. It focuses on practical steps for validation, decision-making and long-term compliance under the Environment Act 2021.
- 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.
Understanding BNG for Local Authorities in England
Definition and statutory background
Under the Environment Act 2021, all planning permissions granted in England (with limited exceptions) must deliver at least a 10 percent biodiversity net gain compared with the site’s baseline condition. For local authorities, this means embedding BNG into every stage of the planning process from pre-application advice to post-construction monitoring. The legal mechanism is reinforced by the Biodiversity Net Gain Regulations 2024, which define how the statutory biodiversity metric must be used, how long habitats must be maintained (30 years minimum), and what constitutes acceptable off-site provision. As of February 2024, BNG became mandatory for major developments, extending to small sites in April 2024.
Why BNG matters for sustainable development
BNG strengthens sustainable development by linking ecological enhancement directly to planning approvals. It ensures that projects leave nature in a measurably better state, supporting ecosystem services such as carbon sequestration, water regulation, and recreational access. For local authorities, BNG for local authorities is also an instrument for delivering natural capital gains building resilient landscapes that serve both people and wildlife.
Relationship with natural capital and environmental stewardship
Integrating BNG into land-use decisions turns biodiversity from an afterthought into an asset. When LPAs apply BNG for local authorities consistently, they contribute to wider environmental stewardship objectives, Local Nature Recovery Strategies (LNRS), and national targets for species abundance.
LPA BNG Requirements and the Validation Process
BNG Validation Checklist
Most councils now require applications to include a BNG validation checklist confirming:
- a statement of BNG applicability (with any BNG exemptions justified).
- completed Biodiversity Metric 4.0 spreadsheet (baseline and proposed habitats).
- habitat maps identifying condition, distinctiveness, and irreplaceable habitats.
- draft Biodiversity Net Gain Plan or BNG plan setting out delivery; and
- proof of a legal mechanism securing 30 years of management (e.g., Section 106 agreement or conservation covenant).
Applications that omit this information may be deemed invalid. Adopting a consistent checklist allows planning officers to assess submissions efficiently and ensures compliance with planning BNG guidance issued by DEFRA and Natural England.
Planning BNG Guidance and Internal Procedures
Each LPA should publish clear planning BNG guidance detailing when BNG applies, the level of survey required, and the format of the metric outputs. Officers should be trained to interpret metric spreadsheets and recognise when professional ecological input is needed. Councils often integrate this into pre-application discussions to avoid delays later.
In practice, BNG for local authorities requires coordination between ecology, development management, legal and enforcement teams. Many councils have introduced internal BNG panels or validation officers dedicated to checking metric accuracy and ensuring the LPA BNG requirements are met before recommendation for approval.
Developing Local Policies and Strategic Alignment
Embedding BNG into Planning Policy
Local authorities can reinforce national obligations through local plan policies and Supplementary Planning Documents (SPDs). These policies should clarify:
- the minimum percentage gain (10 percent or higher locally).
- links to local biodiversity action plans and LNRS priorities.
- expectations for on-site delivery and acceptable use of off-site or credit options; and
- monitoring and reporting procedures.
Clear policy wording prevents ambiguity and supports robust decision-making. Councils like Cornwall, Warwickshire, and Greater Manchester have already incorporated BNG for local authorities into their local frameworks, setting examples for others.
BNG PPG and Official Guidance
The BNG PPG (Planning Practice Guidance) published by Government outlines how authorities should apply BNG in line with the National Planning Policy Framework. It confirms that LPAs must consider BNG at all stages, assess biodiversity gain plans objectively, and enforce long-term commitments. Referencing the PPG ensures decisions remain defensible at appeal.
Local Nature Recovery Strategies and Regional Context
BNG should complement local ecological priorities. By aligning development outcomes with LNRS, authorities can direct habitat creation to areas with the highest strategic value strengthening green infrastructure, restoring ecological networks, and creating wildlife corridors across boundaries.
Need Support Interpreting BNG Policy or Reviewing Submissions?
Our qualified ecologists support local authorities with independent review of biodiversity unit calculations, Biodiversity Gain Plans and Habitat Management & Monitoring Plans to help ensure statutory compliance and consistent decision-making.
BNG Regulations, Exemptions and Legal Instruments
BNG Regulations in Practice
The Biodiversity Net Gain Regulations 2024 set out the legal and procedural framework that all local planning authorities (LPAs) must follow when applying BNG for local authorities in England. These regulations operationalise the principles established in the Environment Act 2021, making BNG a mandatory material consideration in planning. They also standardise how biodiversity gains are measured, approved, and enforced, ensuring a consistent national approach.
In practice, this means LPAs must:
- Verify that all applications falling under BNG contain the required documentation including the biodiversity metric results, habitat maps, and draft Biodiversity Gain Plan.
- Approve a compliant BNG Plan before development begins, confirming that the 10% net gain threshold is achieved.
- Record any off-site biodiversity units within the national Biodiversity Gain Site Register, maintaining transparency and avoiding double counting.
- Secure the long-term delivery and 30-year habitat management through enforceable planning conditions or legal agreements.
By codifying these responsibilities, BNG regulations make the process predictable, transparent, and enforceable. For BNG for local authorities, this creates a clear audit trail of biodiversity outcomes, allowing councils to evidence compliance with both national policy and local biodiversity objectives.
BNG Exemptions
While the BNG duty applies widely, several categories of development remain exempt under the regulations. Exemptions include:
- Householder applications, such as small residential extensions or domestic outbuildings.
- Permitted development projects already authorised under separate legislation.
- Change-of-use applications that do not materially impact habitats; and
- Developments below the de minimis threshold (less than 25 m² of habitat area or 5 m of linear habitat).
For consistency and fairness, authorities should publish local planning BNG guidance that summarises these Biodiversity Net Gain exemptions and references the relevant statutory instruments. Developers should be encouraged to provide basic ecological information even when exempt, as this fosters transparency and supports long-term monitoring of cumulative impacts.
In many cases, LPAs voluntarily apply the principles of BNG for local authorities to non-mandatory developments, encouraging proportionate ecological enhancement even when the full legal duty does not apply.
Legal Mechanisms and Enforcement
Securing BNG delivery relies on robust legal instruments. Typically, LPAs use either:
- Planning conditions, which directly reference the approved Biodiversity Net Gain Plan and require its implementation before occupation or completion; or
- Section 106 obligations or conservation covenants, which formalise responsibilities for habitat creation, monitoring, and maintenance over the 30-year period.
These agreements should set out clear timelines, reporting intervals, and fallback provisions if the expected biodiversity units are not delivered. The agreements also define ownership and funding arrangements, ensuring that management responsibilities remain enforceable even if land ownership changes.
To maintain transparency, LPAs should keep centralised records of all approved BNG for local authority’s projects including the number of biodiversity units created, their locations, and the status of ongoing monitoring. This not only supports compliance audits but also contributes valuable data to local nature recovery strategies.
Failure to implement BNG as approved constitutes a breach of planning control. Authorities can issue enforcement notices, require remedial habitat works, or, in severe cases, pursue legal action. By taking enforcement seriously, councils signal that BNG for local authorities is a statutory obligation with real accountability, not a discretionary add-on to development.
Monitoring, Reporting and Long-Term Stewardship
Monitoring is integral to BNG for local authorities. LPAs should require developers to submit monitoring reports at agreed intervals typically years 1, 5, 10, 20 and 30 confirming habitat condition against the approved metric.
To facilitate oversight, councils may establish BNG registers or GIS dashboards tracking live projects and unit balances. Regular audits allow officers to spot trends, ensure sustainable land management, and initiate remedial measures where outcomes fall short.
Funding and Governance
Delivering BNG requires resourcing. Some authorities are using Bng for local authorities grants, planning performance agreements, or commuted sums to fund ecological officers and digital tools. In larger jurisdictions, cross-boundary cooperation (for instance, shared ecology services) ensures consistent quality across planning areas.
Case Examples and Implementation Models
On-Site vs Off-Site balance
Authorities should encourage on-site enhancement wherever feasible woodland planting, wetland restoration, or urban ecology interventions like green roofs. When on-site delivery is limited, developers may purchase registered biodiversity offsets or units from a nearby habitat bank. LPAs must verify that off-site locations meet the hierarchy of proximity and additionality.
Biodiversity Net Gain examples
Practical Biodiversity Net Gain examples include restoring riparian corridors, creating wildflower meadows, planting native hedgerows for species protection, and incorporating SuDS basins that double as wildlife habitats. Each example can be measured through the statutory metric, providing transparency for decision-makers.
Internal Coordination and Cross-Disciplinary Links
BNG rarely operates in isolation. Effective BNG for local authorities integrates with flood-risk management, landscape design, air-quality assessments, noise surveys, and transport planning. Cross-disciplinary coordination ensures that environmental objectives are not duplicated or contradicted.
Authorities should establish internal working groups bringing together planning, ecology, legal, enforcement and communications teams to share templates such as BNG validation checklists, Habitat Management and Monitoring Plan (HMMP) formats, and condition wording.
Reporting, Transparency and Public Engagement
Transparency improves accountability. Many councils now publish online registers showing approved BNG projects, unit gains, and off-site allocations. This enables public scrutiny and fosters community engagement. Encouraging citizen science or “friends-of” groups to assist in monitoring promotes shared responsibility for biodiversity outcomes.
Where councils consult on BNG policy updates, engaging local stakeholders developers, environmental NGOs, parish councils help refine planning BNG guidance and identify barriers to implementation.
Reporting, Transparency and Public Engagement
Once planning permission is granted, the developer must prepare and submit a Biodiversity Net Gain Plan commonly referred to as the BNG plan for approval before starting any works. This document forms the legal evidence that the approved development will deliver the required biodiversity uplift. For BNG for local authorities, assessing these plans carefully is essential, as they bridge the gap between planning permission and on-the-ground delivery.
A well-prepared BNG plan should do more than summarise numbers; it must clearly demonstrate how the net gain will be achieved, managed, and verified over time. It should include:
- a summary of the baseline and post-development results from the statutory biodiversity metric, including habitat types, distinctiveness, and condition.
- a transparent explanation of how the mitigation hierarchy (avoid, minimise, restore, then compensate) has been applied in the project design.
- maps and plans showing the location of habitat creation or enhancement, linked to target condition and long-term management actions; and
- details of any off-site units or statutory credits, including evidence of registration within the national Biodiversity Gain Site Register.
When reviewing submissions, planning officers should test the BNG plan against local policy, BNG regulations, and the national BNG PPG. They should confirm that habitat types and timescales align with what was conditioned at permission stage, that the 10% minimum net gain is achieved (or exceeded), and that management measures are realistic and funded. Ideally, the BNG plan should be co-signed by both the developer and the land manager responsible for implementation, ensuring accountability throughout the 30-year period.
In short, the BNG plan serves as the operational blueprint for achieving measurable biodiversity improvements. When properly scrutinised and approved, it gives the LPA the confidence that the legal and ecological outcomes of BNG will be delivered in practice not merely on paper.
Compliance Note: Environment Act 2021 and Natural England Guidance
All local planning authorities must demonstrate that their procedures align with the statutory framework established under the Environment Act 2021. The Act formally embeds Biodiversity Net Gain within the English planning system. Part 6, Chapter 1 establishes the requirement for a minimum 10% biodiversity uplift. The uplift must be secured and maintained for at least 30 years.
The Biodiversity Gain (Planning and Reporting) Regulations 2024 provide further implementation guidance. These regulations define what must be submitted, recorded and monitored. They also make use of the statutory biodiversity metric mandatory. In addition, they introduce national reporting requirements for local planning authorities.
Authorities should also apply Natural England guidance, including template JP058 for Habitat Monitoring and Management Plans. This template standardises how long-term habitat management should be described and evidenced. Professional guidance from CIEEM, CIRIA and IEMA further supports good practice. Together, these documents help ensure BNG procedures remain technically robust and legally defensible.
For local authorities, compliance extends beyond administrative requirements. It also demonstrates effective governance and due diligence. By embedding these frameworks within validation, approval and enforcement processes, councils can demonstrate compliance with statutory expectations. This approach also helps decisions withstand scrutiny from inspectors, auditors and potential appeals.
Next Steps and Practical Advice
For local authorities, the successful delivery of BNG depends on strong policy foundations, competent staff, and clear processes that endure beyond individual planning officers. To embed BNG for local authorities effectively:
- Publish an authoritative BNG validation checklist – ensuring every application consistently provides metric data, maps, and management details before validation.
- Provide regular officer training – planners and ecologists should understand how to interpret the statutory metric, read BNG plans, and spot calculation errors early.
- Align policies with LNRS and local biodiversity action plans – linking planning outcomes to strategic nature recovery priorities helps direct habitat creation where it matters most.
- Establish a structured monitoring framework – integrate digital registers, GIS dashboards, and periodic audits so progress against BNG targets can be tracked transparently.
- Secure funding and governance models – use Bng for local authorities grants, Section 106 commuted sums, or service charges to fund long-term oversight.
- Engage communities and partnerships – collaboration with local wildlife trusts, “friends of” groups and parish councils builds long-term stewardship and social value.
When applied systematically, these measures elevate BNG for local authorities from a planning condition into a cornerstone of sustainable place-making. They ensure that every development not only complies with the law but actively contributes to England’s wider vision for biodiversity recovery and climate resilience.
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
This FAQ section answers common questions about Biodiversity Net Gain (BNG) for local authorities, including validation requirements, exemptions, Biodiversity Gain Plans, off-site units, monitoring and long-term compliance. It is designed to help local planning authorities, planning officers, council ecologists and development management teams understand their responsibilities, apply BNG consistently and support robust decision-making through the planning process.
What is the role of local authorities in Biodiversity Net Gain?
Local planning authorities are responsible for applying Biodiversity Net Gain requirements through the planning process. This includes validating submissions, reviewing biodiversity metric calculations, assessing whether exemptions apply, securing habitat delivery and ensuring long-term management and monitoring arrangements are in place.
When did Biodiversity Net Gain become mandatory for local authorities in England?
Biodiversity Net Gain became mandatory in England for most major developments on 12 February 2024 and for small sites on 2 April 2024, subject to specified exemptions. Local planning authorities must apply these requirements when determining relevant planning applications.
What documents should local authorities expect in a BNG submission?
A BNG submission will often include a completed biodiversity metric, habitat plans, baseline survey information, a statement explaining whether the development is exempt or subject to BNG, and details of how the required gain will be delivered on-site, off-site or through statutory credits where justified.
What is a Biodiversity Gain Plan and when is it required?
A Biodiversity Gain Plan sets out how the development will achieve the required biodiversity uplift. It is usually submitted after planning permission is granted but before development begins, and must be approved before the pre-commencement condition can be discharged.
Are some developments exempt from BNG requirements?
Yes. Some developments may be exempt, including certain householder applications, some change-of-use proposals, development with only de minimis habitat impacts and other categories defined in legislation and guidance. Each case should be checked carefully against the current exemption criteria.
Can local authorities accept off-site biodiversity units?
Yes. Where on-site habitat creation or enhancement is insufficient, registered off-site biodiversity units may be used to address the shortfall. Statutory biodiversity credits are generally intended only as a last resort where suitable on-site and off-site options are not available.
How long must BNG habitat delivery be maintained?
Habitats created or enhanced for Biodiversity Net Gain must normally be maintained for at least 30 years. This is usually secured through planning conditions, Section 106 obligations or conservation covenants, together with a Habitat Management and Monitoring Plan.
How should local authorities monitor BNG delivery over time?
Local authorities should require monitoring reports at agreed intervals and maintain clear records of approved projects, habitat delivery, unit allocation and condition assessments. Effective monitoring helps ensure that promised biodiversity gains are actually delivered and maintained.
Why should BNG be aligned with Local Nature Recovery Strategies?
Aligning Biodiversity Net Gain with Local Nature Recovery Strategies can help direct habitat creation and enhancement towards strategically important areas. This supports wider ecological networks, improves landscape-scale outcomes and helps councils deliver broader environmental objectives.
What support can local authorities use to implement BNG effectively?
Local authorities can strengthen implementation through validation checklists, officer guidance notes, standard condition wording, internal review procedures, GIS-based monitoring, ecological input on complex schemes and training for planning and enforcement teams.
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- Last Updated:
- September 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.