When does mandatory BNG apply in England?

Mandatory 10% BNG applies to: most major developments from February 2024, smaller sites from April 2024. Nationally Significant Infrastructure Projects from November 2025. Exemptions include de minimis projects (<25m² habitat impact) and brownfield sites meeting criteria.

What are statutory biodiversity credits?

Statutory credits are a last resort where off-site habitat creation is not available or deliverable. Government sets their price to make in-nature delivery more attractive: £42,000 per unit for grassland, higher for woodland. Credits are purchased from Natural England and fund habitat creation elsewhere.

Biodiversity Net Gain Baseline Habitat Units ×10% Calculator

Calculate mandatory 10% biodiversity net gain (BNG) requirement under Environment Act 2021 (England): baseline habitat units × 1.1. Shows on-site/off-site/statutory credit pathway and BNG metric (Defra Biodiversity Metric 4.0).

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⚖ For informational purposes only. Not legal advice. Consult a licensed attorney for your specific situation.

How to Use

Enter the values for the scenario you are assessing. Calculate mandatory 10% biodiversity net gain (BNG) requirement under Environment Act 2021 (England): baseline habitat units × 1.1. Shows on-site/off-site/statutory credit pathway and BNG metric (Defra Biodiversity Metric 4.0). Use the biodiversity net gain result to inform your calculation.

Biodiversity Net Gain Baseline Habitat Units ×10% Calculator

Statute of Limitations

How to Use

Frequently Asked Questions

When does mandatory BNG apply in England?

What are statutory biodiversity credits?