Buying biodiversity units has become an essential part of the UK planning system, making it a crucial requirement for developers. With the implementation of the Environment Act 2021, new developments in England are mandated to achieve a minimum of 10% biodiversity net gain (BNG) compared to the site’s baseline conditions before development. This shift emphasises the importance of integrating biodiversity considerations in planning and development processes.
For many developers, achieving this biodiversity net gain on-site can present significant challenges. Factors such as limited available space, the existing value of land, and competing design priorities often make it difficult, if not impossible, to meet these requirements directly on the development site. Consequently, the off-site market for biodiversity units has emerged as a practical solution.
If you’re inquiring “Where can I buy BNG units?” or looking for BNG units for sale to fulfil your planning obligations, this comprehensive guide will provide you with all the necessary information. Learn how The BNG Guy can assist you in locating, securing, and registering biodiversity units swiftly and in compliance with all regulations. Don’t miss out on the opportunity to meet your biodiversity net gain requirements effectively.
What Exactly Is a BNG Unit?
A BNG unit represents a crucial currency in the realm of biodiversity, providing a standardized method to measure and account for the creation or enhancement of habitats. The Statutory Biodiversity Metric, currently in version 4.1, quantifies habitats based on several key criteria:
- Area or length measured in hectares or metres
- Distinctiveness, differentiating between types such as poor grassland and species-rich meadows
- Condition, evaluating the quality of the habitat
- Strategic significance, ensuring alignment with local priorities, including the Local Nature Recovery Strategy (LNRS)
When you create or enhance habitats, you accumulate BNG units; conversely, when habitats are destroyed or degraded, BNG units are lost.
To achieve a target of “no net loss” plus 10%, developments must offset any habitat loss with sufficient gains. If on-site gains are not feasible, you can buy BNG units from another site that has successfully generated them through habitat creation.
These units are often referred to as off-site BNG units for sale, and each unit comes with legal assurances guaranteeing that the associated habitat will be managed effectively for a minimum of 30 years.
When Do You Need to Buy BNG Units?
When considering the need to buy BNG units, it is essential to understand the circumstances that typically necessitate the purchase of off-site units:
- Your site is spatially constrained — This is often the case with urban infill projects or brownfield regeneration where space limitations hinder on-site solutions.
- Habitat creation is not feasible — There may be various reasons for this, including unsuitable soil type, design layout challenges, engineering limitations, or contamination issues that prevent effective habitat implementation.
- You need to meet a specific planning condition quickly — In instances where time is of the essence, buying BNG units can provide a fast solution when on-site mitigation is not feasible.
- Your local planning authority (LPA) may require local or regional biodiversity compensation that aligns with broader strategic priorities, thus prompting the need to purchase BNG units.
- You have already maximised on-site measures — Even after implementing all possible on-site solutions, you might still find yourself short of the required biodiversity net gain, making the acquisition of BNG units necessary.
In summary, you should consider buying BNG units when you cannot meet the biodiversity net gain (BNG) requirements on-site, or when attempting to do so would render the project economically or technically unviable.
Why Buying Through The BNG Guy Is Different
At The BNG Guy, we go beyond simply brokering units. We integrate the ecological, legal, and planning aspects of BNG delivery into a single, seamless service.
Access to Trusted Habitat Banks
We partner with registered habitat banks and landowners across England, enabling us to provide a transparent catalogue of BNG units for sale across various habitat types and Local Nature Recovery Strategy (LNRS) regions. If you’re looking to buy BNG units, our platform offers a wide selection, ensuring you can find the right biodiversity units to meet your biodiversity net gain requirements.
Expert Ecological Oversight
As experienced ecologists, we go beyond merely facilitating the sale of units. We ensure that your biodiversity metric calculations, habitat types, and geographic alignment fulfill your Local Planning Authorities (LPA) expectations, mitigating any surprises at the discharge stage. Our expertise helps developers buy biodiversity units that truly deliver biodiversity net gains.
Speed and Certainty
Delivery of BNG often plays a critical role in the planning process. We understand the importance of time; thus, our streamlined reservation process and clear documentation enable you to secure your biodiversity net gain units swiftly and avoid costly delays. Whether you need off-site biodiversity solutions or on-site units, we have you covered.
End-to-End Support
From calculating your biodiversity shortfall to preparing allocation agreements, registering on the Biodiversity Gain Sites Register, and coordinating with legal teams, we manage the complete process. If you are looking to buy biodiversity net gain units, our team ensures that you have the necessary bng solutions to effectively implement your biodiversity gain plan.
Long-Term Partnership
Our support continues long after your purchase. We offer assistance with Habitat Management and Monitoring Plans (HMMPs) and provide ecological oversight throughout project delivery. By partnering with us, you can ensure that your biodiversity improvements are maintained and that you are meeting your bng obligations for at least 30 years, in line with the Environment Act 2021.
The Process: How to Buy BNG Units (Step by Step)
Buying off-site units through The BNG Guy is simple, transparent, and fully compliant.
Calculate Your BNG Requirement
Begin by conducting a Biodiversity Metric assessment. This crucial step helps to identify:
- Your site’s baseline habitat value
- Your post-development habitat value
- The net gain or deficit in biodiversity units
If your site delivers less than a 10% uplift, you will need to source additional units to meet your biodiversity net gain (BNG) requirements.
(Need assistance? The BNG Guy can perform your complete BNG Metric 4.1 calculation and provide a detailed report.)
Explore On-Site Options
Local planning authorities expect developers to prioritize on-site enhancements. Ensure that you demonstrate efforts such as retention of existing habitats, installation of green roofs, landscaping enhancements, or creation of habitat corridors before considering off-site solutions.
Identify Suitable Off-Site Units
Once you confirm the shortfall in BNG units, we will assist you in identifying BNG units for sale that are compatible with your habitat type, distinctiveness, and geographic location. Our considerations will include:
- Alignment with Local Nature Recovery Strategies (LNRS)
- Habitat type and its distinctiveness
- Strategic proximity to your development site
- Local Planning Authority (LPA) preferences and policies
Reserve and Secure Units
Upon finding a suitable match, you will receive a BNG Unit Reservation Agreement that details:
- Unit ID numbers
- Habitat types and their respective quantities
- Price breakdown for the units
- Reservation period and payment terms
This agreement secures your allocation while the necessary legal documentation is finalized.
Legal Agreement & Registration
The purchase of the biodiversity units is formalized through either:
- a Section 106 agreement with the Local Planning Authority (LPA); or
- a Conservation Covenant with a Responsible Body.
After signing, the units are registered in the Biodiversity Gain Sites Register managed by Natural England, ensuring official traceability and compliance for your project.
Submit Evidence to LPA
Provide your Local Planning Authority with your biodiversity metric, BNG statement, unit allocation confirmation, and the legal agreement. This completes your biodiversity condition at the planning stage.
Monitoring & Reporting
Habitat banks will be responsible for ongoing management and monitoring, typically every five years for a duration of 30 years. You should retain evidence for your planning file to demonstrate compliance.
What to Look For When Buying BNG Units
When comparing BNG units for sale, consider these seven essentials:
| Factor | Why It Matters | What to Check |
|---|---|---|
| 1. Locality Local Planning Authorities (LPAs) favor biodiversity units located within the same Local Nature Recovery Strategy (LNRS) or district to ensure local ecological coherence. Is the habitat bank you are considering local to your development site? This can enhance the ecological benefits and compliance with local regulations. 2. Habitat Type & Distinctiveness It is essential to ensure that the habitat types offered match the requirements outlined in your biodiversity metric. This alignment is crucial for the success of your ecological plans. Do the biodiversity units available for purchase align with the specific habitat types you need? Confirming this will aid in ecological restoration efforts. 3. Condition & Quality The condition and quality of biodiversity units directly influence their value and cost. Higher quality units typically demand a higher investment. Before making a purchase, check both the baseline and target condition ratings of the units to ensure they meet your project standards. 4. Legal Security It is vital that biodiversity units are secured by a legally binding agreement. This protects your investment and ensures compliance with environmental regulations. Confirm that a Section 106 agreement or conservation covenant is in place to safeguard the biodiversity units you plan to buy. 5. Management Plan A comprehensive management plan is critical for ensuring the ongoing delivery and maintenance of biodiversity benefits over a period of 30 years. Review the Habitat Management and Monitoring Plan (HMMP) along with the monitoring schedule to ensure long-term sustainability of the units. 6. Cost Transparency When purchasing biodiversity units, it is crucial to avoid unexpected fees or monitoring surcharges that can inflate costs. Request a detailed breakdown of all costs upfront to ensure complete transparency and avoid any surprises later. 7. Registration Status Local Planning Authorities require that biodiversity units have official registration to ensure compliance with environmental standards. Make sure that the units you intend to purchase are either currently listed or will be listed on the Biodiversity Gain Sites Register, which is crucial for regulatory approval. | LPAs prefer units within the same LNRS or district. | Is the habitat bank local to your development? |
| 2. Habitat Type & Distinctiveness | You must match habitat types in the metric. | Do the offered units align with your required types? |
| 3. Condition & Quality | Higher condition = higher value & cost. | Check the baseline and target condition ratings. |
| 4. Legal Security | Units must be backed by a binding agreement. | Confirm Section 106 or conservation covenant is in place. |
| 5. Management Plan | Ensures delivery over 30 years. | Review the HMMP and monitoring schedule. |
| 6. Cost Transparency | Avoid hidden fees or monitoring surcharges. | Request a full breakdown of costs upfront. |
| 7. Registration Status | LPAs require official registration. | Ensure the units are (or will be) listed on the Biodiversity Gain Sites Register. |
Typical Costs of BNG Units
Prices vary across England depending on habitat type, distinctiveness, and local supply. Read our complete guide on BNG Unit costs here.
Typical market ranges (based on current 2025 data):
Let’s get to the point. As of 2025, the cost of BNG units in England generally falls within the following ranges:
| BNG Unit Type | Low-End Cost (per unit) | High-End Cost (per unit) |
|---|---|---|
| Habitat Units | £20,000 | £35,000+ |
| Hedgerow Units | £30,000 | £45,000+ |
| River Units | £40,000 | £100,000+ |
Cost drivers include:
- Land availability and value in your LPA
- Type and condition of habitat
- Market demand and supply (some LNRS areas sell out fast)
- Legal and monitoring costs
- Whether you buy through a private bank or the Statutory Credit Scheme (which is designed to be more expensive as a last resort)
(The BNG Guy always prioritises private habitat banks first to ensure best value for clients.)
Legal & Regulatory Framework
When you buy BNG units, it is essential to ensure that your purchase aligns with the Environment Act 2021 and the associated BNG Regulations 2024. Adhering to these legal frameworks not only promotes sustainable practices but also guarantees that your investment contributes positively to environmental conservation efforts. Understanding these regulations is crucial for anyone looking to buy BNG units, as compliance can enhance the value of your purchase and ensure that it meets all necessary environmental standards.
Key legal requirements
- Enjoy a minimum 10% net gain uplift when you buy BNG units, ensuring a profitable investment.
- Commit to a minimum 30-year habitat management term, promoting long-term ecological sustainability.
- Secure your investment through a Section 106 Agreement or a Conservation Covenant, guaranteeing environmental compliance.
- Register on the Biodiversity Gain Sites Register before project commencement to enhance credibility and visibility.
- Ensure that your delivery aligns with Local Nature Recovery Strategies, contributing positively to local ecosystems.
Alternatives to Buying BNG Units
If you are searching for ways to achieve compliance and cannot locate suitable off-site units, there are three effective routes you can take:
- On-site creation/enhancement – This option involves delivering Biodiversity Net Gain (BNG) initiatives within your project’s red-line boundary, ensuring that you enhance the local environment while meeting regulatory requirements.
- Off-site delivery – A preferred alternative is to buy BNG units from a registered habitat bank. This method allows you to support biodiversity efforts while fulfilling compliance obligations effectively.
- Statutory Biodiversity Credits – As a last resort, you may consider purchasing statutory biodiversity credits from the government. However, be aware that this option is typically 40–100% more expensive than other alternatives.
Why Acting Early Matters
BNG: The Essential Planning Gatekeeper
In today’s development landscape, many Local Planning Authorities (LPAs) will not validate or make determinations on applications without a comprehensive BNG (Biodiversity Net Gain) strategy. Failing to address this requirement early on can significantly delay entire projects, making it crucial for developers to prioritize BNG considerations from the outset.
Secure Your Investment: Buy BNG Units Early
As demand for BNG units increases and supply diminishes, prices are on the rise. By choosing to buy BNG units early, you can lock in lower rates and achieve substantial savings. This proactive approach not only mitigates financial risks but also positions your project favourably in a competitive market.
Enhance Your Approval Chances with Locality
Acting swiftly to buy BNG units allows you to secure units that are closer to your development site. This strategic advantage can strengthen your case for LPA approval, demonstrating a commitment to local biodiversity and sustainability, which is increasingly valued in planning decisions.
Streamline Your Process with Early Documentation
Legal agreements and documentation related to BNG can take several weeks to finalize. Engaging early in the process to buy BNG units helps prevent unnecessary delays in registering these units and fulfilling any conditions set forth by LPAs. Early action ensures a smoother, more efficient project timeline.
Frequently Asked Questions
Q: Can I buy BNG units anywhere in England?
A: Technically yes, but local planning authorities (LPAs) prefer biodiversity net gain (BNG) units local to the project. To meet statutory biodiversity requirements, The BNG Guy assists in aligning with the Local Nature Recovery Strategy, ensuring compliance with local regulations.
Q: How many units do I need?
A: Your ecologist will determine the number of biodiversity units required using the statutory Biodiversity Metric (e.g., Metric 4.1). This calculation is based on habitat losses and the necessary 10% uplift to achieve biodiversity enhancements.
Q: How long do units last?
A: All off-site BNG units must be managed and monitored for at least 30 years to ensure long-term biodiversity gains.
Q: Who manages the habitat once I buy the units?
A: The registered habitat bank takes full responsibility for the creation, management, and reporting of the habitat. Your role is to retain evidence of your allocation, ensuring you meet BNG obligations.
Q: What if my planning permission is refused?
A: Our reservation agreements contain clauses that address refund or reallocation options if planning permission is not granted, protecting your investment in biodiversity units.
Q: Can The BNG Guy also do my metric calculation?
A: Yes – we offer comprehensive BNG services, including biodiversity metric calculations, Habitat Management and Monitoring Plans (HMMPs), monitoring plans, and liaison with local planning authorities (LPAs).
Case Study Example
Project: Residential Development, Staffordshire
BNG Shortfall: 2.8 habitat units + 120 m hedgerow
Solution: The BNG Guy secured local grassland and hedgerow units from a nearby registered bank within 14 days.
Outcome: Planning condition discharged ahead of schedule; cost saving of £12,000 compared to statutory credits.
The BNG Guy Checklist: How to Buy BNG Units
1. Calculate your baseline using BNG Metric 4.1.
2. Determine your shortfall – what units are needed?
3. Maximise on-site options before going off-site.
4. Contact The BNG Guy for available units and quotations.
5. Reserve units through a Reservation Agreement.
6. Finalise legal documentation (Section 106 or Conservation Covenant).
7. Register allocation on the Biodiversity Gain Sites Register.
8. Submit BNG Statement and Allocation Certificate to your LPA.
9. Retain audit trail & record of compliance for planning file.
10. Maintain ongoing contact with The BNG Guy for support and future projects.
Conclusion
Buying BNG units, or biodiversity net gain units, is a crucial step for developers looking to enhance biodiversity in their projects. By partnering with The BNG Guy, you can streamline the process and ensure compliance with statutory biodiversity requirements. Our services include:
- Direct access to a wide range of biodiversity units for sale across England, including offsite units and bng habitat banks.
- Expert guidance from ecologists and legal professionals to navigate the complexities of bng obligations.
- Transparent pricing for buying biodiversity net gain units and quick delivery to meet your project timelines.
- Confidence that your development site meets all local planning authorities (LPA) requirements and planning conditions.
At The BNG Guy, we support developers, planners, and land agents in buying BNG units efficiently, ensuring your projects contribute to an increase in biodiversity and fulfil the Environment Act 2021 mandates. By purchasing biodiversity credits, including off-site biodiversity options like grassland and hedgerows, you can enhance the ecological value of your development, creating sustainable habitats for future generations.