BIODIVERSITY NET GAIN · COST PLANNING
Biodiversity Net Gain Costs & Pricing
Understand BNG costs and build your budget around the development’s actual habitat requirements and delivery route.
There is no universal BNG unit price or fixed project fee. Costs can include habitat surveys, metric assessment, on-site delivery, private off-site units, legal and registration work, and long-term management and monitoring.
Government statutory credits have published prices but remain a last-resort mechanism, not a private-market price guide. ACP can review the project information and help scope the technical work behind a project-specific budget.
Build the budget
What Makes Up Your BNG Costs?
Biodiversity Net Gain is not one fee. It is a chain of project costs that can appear at different stages of design, planning and long-term delivery.
For many developments, the main cost categories are:
- ecological survey and habitat baseline work;
- Statutory Biodiversity Metric assessment and design iterations;
- Biodiversity Gain Plan and supporting planning documents;
- on-site habitat creation or enhancement;
- off-site biodiversity units where a shortfall remains;
- statutory biodiversity credits only where the last-resort route is available and justified;
- legal agreements and associated professional costs;
- gain-site registration or allocation fees where relevant;
- long-term habitat management, monitoring and reporting; and
- authority monitoring charges where they apply.
The exact combination is project-specific. Some schemes may deliver most of their gain on-site. Others may need registered off-site units. A project that changes layout late can also change its unit requirement and cost position.
Key point: build the budget from the project’s actual BNG route. Do not multiply a generic “cost per unit” by the site area and treat that as the total cost.
BNG project cost-stack checklist
Use these checkpoints to structure a review. They are not a legal eligibility ruling, a metric calculation or an enquiry submission.
- Scope / baselineCheck BNG applicability, ecological survey and statutory metric.
- On-site deliveryHabitat design, creation/enhancement and site constraints.
- Off-site procurementRequired type/quantity and current supplier quotations.
- Administration and legalSite registration, allocation and agreement costs where relevant.
- Long-term deliveryHMMP, maintenance, replacement and monitoring funding.
- Regulator and professionalLPA monitoring charges and consultancy/report scope.
- Credit fallbackOnly where eligible; published government tariff and 2:1 treatment.
Next step: collect the project evidence and discuss unresolved gates with the appropriate ecologist, land agent or legal adviser.
Start with evidence
Before You Estimate BNG Cost, Establish What the Project Actually Needs
A useful BNG budget starts with evidence rather than a market average.
Confirm whether statutory BNG applies
Check the current GOV.UK exemptions and any transitional provisions before budgeting for the full statutory BNG route. The costs discussed below apply where the relevant BNG work is needed.
Establish the habitat baseline
The existing habitats determine the starting biodiversity value. Site size alone does not tell you how many units a project will need.
Run the Statutory Biodiversity Metric
The metric shows the baseline, proposed gains and any residual shortfall. That output is the foundation for deciding whether the budget needs on-site delivery, off-site units or another route.
ACP can provide a Statutory Biodiversity Metric assessment where this forms part of the agreed scope.
Test the design before fixing the cost allowance
A change in habitat loss, retained habitat, proposed enhancement or development layout can alter the metric result. Therefore, cost planning should develop alongside the ecological and design work.
Budget rule: first establish the requirement. Then price the delivery route.
Understand the market
Is There a Standard BNG Cost per Unit?
No. There is no government-set national price for private off-site biodiversity units.
Defra and Natural England state that they do not set off-site biodiversity unit prices. They also state that statutory biodiversity credit prices are not guideline prices for units sold in the private off-site market.
A private unit quote can vary because the underlying habitat delivery differs. Important factors can include:
- habitat type and target condition;
- creation or enhancement costs;
- management over at least 30 years;
- monitoring and reporting;
- remedial risk;
- professional and legal input;
- inflation assumptions;
- location and spatial-risk effects; and
- the provider’s commercial structure.
The price paid by a developer also needs to be considered alongside the metric. The number and type of units that satisfy one development may not be identical for another project.
For the terminology and calculation relationship, see BNG units and statutory credits explained.
Private units and statutory credits are different price systems
Private off-site biodiversity units are supplied through registered off-site habitat delivery. Their price is agreed commercially.
Statutory biodiversity credits are sold by government at published prices and are intended as a last resort. They follow a separate price table and spatial-risk multiplier.
That distinction is essential when comparing figures.
Compare private quotes
What Affects the Cost of Private Off-Site Biodiversity Units?
If a project cannot meet its required position through the chosen on-site route, it may need off-site biodiversity units.
The price is not set nationally. Instead, a live quote should relate to the units the project actually needs and the provider’s delivery costs.
Habitat type and delivery difficulty
Some habitat outcomes require more complex establishment, specialist management or greater remedial contingency. These factors can affect the provider’s cost base.
Long-term management and monitoring
Off-site habitat gains must be secured and maintained for at least 30 years. Government guidance tells land managers to consider creation, management, monitoring, reporting, expert input, insurance, remedial work and inflation when pricing units.
Location and the metric
Location can affect how an off-site gain contributes to the development’s metric result. A cheaper headline unit quote should therefore not be compared in isolation from the metric outcome.
What the price includes
Two quotes are not necessarily equivalent. Confirm whether the quoted sum includes the full habitat-delivery obligation, monitoring, registration-related administration and other provider costs.
If you need the wider process, read our guide to off-site biodiversity units.
If you are ready to investigate supply, see our page on buying biodiversity units and BNG credits.
Cost-planning rule: obtain current project-specific quotes after the metric identifies the type and quantity of off-site units required.
Government credit tariff
Current Statutory Biodiversity Credit Prices
Statutory biodiversity credits are a government last-resort option. They are not the same as private off-site biodiversity units.
The current GOV.UK price table was last updated on 2 June 2026. Government guidance says the prices are reviewed every six months. The published statutory credit prices are:
| Tier | Current price per credit |
|---|---|
| A1 | £42,000 |
| A2 | £48,000 |
| A3 | £66,000 |
| A4 | £125,000 |
| A5 | £650,000 |
| H — hedgerow | £44,000 |
| W — watercourse | £230,000 |
Worked example — one A2 unit shortfall
If the metric shows a residual shortfall equivalent to 1 biodiversity unit and the applicable statutory credit tier is A2:
- metric credit requirement: 2 statutory credits;
- A2 price per credit: £48,000;
- illustrative credit purchase cost: 2 × £48,000 = £96,000
This example demonstrates the arithmetic only. It does not establish that a project is eligible to use statutory credits, that A2 is the correct tier, or that one unit is the actual shortfall.
VAT and price checks
GOV.UK states that VAT is not payable on statutory biodiversity credits.
However, the credit table can be reviewed and changed. Check the current GOV.UK price page and use the project’s actual metric output before putting a statutory-credit allowance into a live budget.
Important: government statutory credit prices must not be used as a guideline price for private off-site biodiversity units.
Professional scope
Professional and Planning BNG Costs to Allow For
A BNG budget often starts before any habitat work or unit purchase. The project team first needs enough evidence to establish the biodiversity position and support planning.
The professional scope may include:
Baseline habitat survey
The site’s habitat types, extent and condition need to be understood before the baseline can be calculated.
Statutory Biodiversity Metric
The metric converts habitat information and design proposals into the biodiversity-unit position used for BNG decision-making.
Design review and metric iterations
Early layouts can change. Where habitat loss, retention or enhancement changes, the metric and cost position may need to be updated.
Biodiversity Gain Plan
Where required, the Biodiversity Gain Plan explains how the development will meet its BNG objective and supplies the supporting evidence.
Habitat Management and Monitoring Plan
Long-term habitat delivery may need a Habitat Management and Monitoring Plan, especially where significant on-site or off-site gains need a clear management and monitoring framework.
Planning and project coordination
A scheme may also need ecological input to respond to design changes, authority comments, unit sourcing information or legal-delivery requirements.
Professional assessment fees depend on the site, available ecological information and agreed deliverables. Request a project-specific scope and quotation rather than relying on a universal assessment rate.
Whole-life delivery
On-Site Habitat Delivery Can Create Long-Term Cost Commitments
Delivering BNG on-site can reduce or avoid an off-site unit purchase. However, on-site delivery is not “free biodiversity”. The budget needs to reflect the habitat outcome being promised.
Depending on the scheme, on-site costs can include:
- habitat creation or enhancement works;
- landscape establishment and replacement planting;
- specialist materials or site preparation;
- land taken out of another development or management use;
- ongoing habitat management;
- ecological monitoring and reporting;
- remedial work if a habitat is not progressing as planned; and
- the professional input needed to review and adapt management.
Current government guidance requires relevant significant on-site gains to be maintained for at least 30 years. The securing route and management responsibilities are project-specific.
This is why a low upfront construction allowance can give a misleading picture. The project team should consider the whole management period and the practical route to the target habitat condition.
For the delivery framework, see our Habitat Management and Monitoring Plan service.
Budget question: who will fund, manage, monitor and remedy the habitat throughout the secured period?
Legal & administration
Legal, Registration and Allocation BNG Costs
BNG can create legal and administrative costs as well as ecological and habitat-delivery costs.
Legal agreements
Off-site gains need a legal agreement. Depending on the project, significant on-site gains can also need a legal agreement or planning condition.
For BNG, the two main legal-agreement routes are a Section 106 planning obligation and a conservation covenant. Government guidance advises parties to obtain legal advice and states that legal and other agreement-related costs must be paid.
For the dedicated comparison, see Conservation Covenant vs Section 106.
Biodiversity gain site registration
Where land is being registered as a biodiversity gain site, the current government application fee is £639
Registration is a land/gain-site process. A developer buying units from an existing provider should not automatically add a second £639 fee without understanding the transaction structure.
For the process, see our Biodiversity Gain Site guide.
Recording an allocation to a development
The current government application fee to record an allocation of off-site gains to a development is £45
Who pays or administers this may depend on the commercial arrangement. Confirm the responsibility rather than assuming it sits with one party.
The £639 registration fee and £45 allocation fee were checked against GOV.UK on 14 October 2026. Confirm current fees with the official service before including them in a live budget.
Monitoring & oversight
Monitoring and LPA Fees Are a Separate Cost Category
Long-term BNG delivery may involve ecological monitoring, reporting and authority oversight. These costs are separate from the price of buying private off-site units or statutory credits.
A project budget may need to distinguish between:
- professional ecological monitoring and reporting;
- habitat management and remedial works;
- an LPA monitoring fee where one applies;
- legal or agreement-administration costs; and
- additional surveys triggered by a project-specific requirement.
There is no single national LPA BNG monitoring-fee schedule. Local authorities can use different methods and charging structures.
For published authority examples and an early-stage professional monitoring budget tool, use ACP’s BNG Monitoring Fee Calculator.
Key point: do not add an LPA monitoring charge and an ecological monitoring budget as though they are the same cost.
Plan with confidence
How to Control BNG Cost Without Weakening Delivery
The most useful cost savings normally come from better information and earlier decisions, not from applying a lower arbitrary unit price.
Confirm whether BNG applies before commissioning the full process
Check the current exemption position first. Do not budget for a full statutory BNG route on an exempt proposal.
Survey early enough to inform the layout
A late habitat baseline can reveal constraints after the site plan has already been fixed. Early evidence gives the design team more room to avoid unnecessary habitat loss.
Use the metric to compare design options
The cost question should follow the metric. Test whether reasonable design changes reduce the residual shortfall before sourcing off-site units.
Separate unavoidable habitat costs from optional specification choices
Do not hide BNG habitat costs inside a general landscape allowance. Identify what is required to establish, manage and monitor the committed habitat outcome.
Obtain like-for-like off-site unit quotes
Check that the unit type, quantity, metric contribution and provider scope are comparable. A cheaper headline rate may not deliver the same metric outcome or included services.
Budget for the full delivery period
Include management, monitoring, reporting, remedial risk and relevant legal/admin costs. A low upfront habitat-creation figure may understate the real commitment.
Reconfirm live figures before a financial decision
Private unit prices, authority fees and government charges can change. Record the quote date, source, assumptions and validity period in the project budget.
Need a clearer BNG cost position before the design is fixed?
ACP can review the available habitat information, metric position and project stage, then identify the cost drivers that need current quotes or further technical work.
Prepare your enquiry
What We Need to Review Your BNG Cost Position
You do not need every BNG document before contacting ACP. However, the more of the following information you can provide, the more precisely the next steps can be scoped.
Useful starting information
- site address or location;
- red-line site boundary;
- current development layout;
- planning stage and application reference, if available;
- existing habitat survey or UKHab mapping;
- current Statutory Biodiversity Metric calculation;
- known residual off-site unit requirement;
- Biodiversity Gain Plan or draft BNG strategy;
- Habitat Management and Monitoring Plan, if prepared;
- current off-site unit quote, if one has been obtained; and
- any local authority BNG or monitoring requirements already identified.
If you only have a site plan
Send the site location, red-line boundary and current layout. We can identify which information is missing before a reliable cost position can be developed.
If you already have a metric shortfall
Send the latest metric workbook and the relevant habitat information. This helps distinguish a commercial unit-sourcing question from a wider design or assessment issue.
Do not send confidential financial information that is not needed to scope the ecological work.
Your questions answered
Frequently Asked Questions About BNG Costs
How much does Biodiversity Net Gain cost?
There is no single standard cost. A project may need to budget for survey and assessment, habitat delivery, off-site units, legal work, management, monitoring and administration.
The most reliable estimate starts with the site baseline and Statutory Biodiversity Metric. Once the delivery route and any residual shortfall are known, current project-specific quotes can be obtained.
How much does one private biodiversity unit cost?
There is no government-set national price for private off-site biodiversity units.
Defra and Natural England say private unit prices are not set by government. Prices can vary with habitat delivery, management, monitoring, risk, location and the commercial provider. Obtain a current quote for the actual unit type and quantity required by the metric.
Are statutory credit prices a guide to private BNG unit prices?
No. GOV.UK explicitly states that statutory biodiversity credit prices are not guideline prices for off-site units sold in the private market.
Statutory credits are a separate government last-resort mechanism with published prices.
What are the current statutory biodiversity credit prices?
The current published prices range from £42,000 per credit at tier A1 to £650,000 per credit at tier A5. Hedgerow credits are £44,000 per credit and watercourse credits are £230,000 per credit.
The applicable price depends on the habitat tier. The government page was last updated on 2 June 2026 and says prices are reviewed every six months, so the live table should always be checked.
Why can one biodiversity unit require two statutory credits?
The statutory-credit spatial-risk multiplier doubles the number of government credits needed. GOV.UK states that 2 statutory credits are required for every 1 biodiversity unit compensated through this route.
The Statutory Biodiversity Metric applies this multiplier automatically. The published credit table is priced per credit, not per biodiversity unit shortfall.
Is VAT charged on statutory biodiversity credits?
No. Current GOV.UK guidance states that VAT is not payable on statutory biodiversity credits.
That VAT position applies to the government statutory-credit purchase. It should not be assumed to determine the VAT treatment of separate private services, habitat works or commercial unit transactions.
What other costs should I budget for if I buy off-site units?
Check the transaction scope rather than assuming the unit price is the only cost.
Depending on the arrangement, the wider project may still incur ecological assessment, design updates, planning documentation, legal costs, authority monitoring charges and internal project-management costs. Registration or allocation administration also needs to be understood where relevant.
Does on-site BNG avoid long-term costs?
Not necessarily. On-site habitat creation or enhancement can require establishment, management, monitoring, reporting and remedial work.
Relevant significant on-site gains are normally secured for at least 30 years. The cost should therefore be considered across the delivery period, not only at construction stage.
Is there a national BNG monitoring fee?
No. Local authorities can use different charging methods where monitoring fees apply.
Use ACP’s BNG Monitoring Fee Calculator for selected published authority examples and a separate professional monitoring-budget planner.
What information does ACP need to quote BNG work?
Start with the site location, red-line boundary, current layout and planning stage.
If available, also provide the habitat survey, current Statutory Biodiversity Metric, Biodiversity Gain Plan, HMMP or known off-site unit shortfall. ACP can then scope the technical work required before any project-specific fee is confirmed.
Discuss Your BNG Budget
Tell us the site location, planning stage, habitat baseline and any draft metric or off-site quotations so we can scope a useful cost review.
You do not need every document before contacting us. Please summarise what you have; we can discuss how to share supporting information securely if a review is appropriate.
Your project, site location and contact details can be provided through the enquiry form.
Prefer to talk? 0330 236 7329 · hello@acp-consultants.com.
Sources and scope
The following official guidance was checked for this research on 14 October 2026. Guidance, government fees, legal requirements and statutory-metric tools may change.
Understanding BNG · Statutory biodiversity credit prices · Sell biodiversity units as a land manager · Register a biodiversity gain site · Record allocation of off-site gains.
Scope of this guide. This is a project-budgeting guide, not a quotation or a private-market tariff. Habitat delivery, consultancy, legal, management and monitoring costs require project-specific scopes and prices. Illustrative statutory-credit calculations are not a substitute for a current official price check or the project metric.
This information supports initial ecological and planning discussions in England. It does not determine a planning outcome or replace project-specific ecological, planning, legal or commercial advice.
Disclaimer date: October 2026.