Biodiversity Net Gain

Mandatory biodiversity net gain as set out in the Environment Act 2021 requires all new developments (unless exempt) under the Town and Country Planning Act 1990 to deliver at least 10% biodiversity net gain from 12 February 2024, with small sites requiring BNG from 2 April 2024.

The first step in delivering BNG is to undertake a BNG Feasibility Assessment, normally as part of a Preliminary Ecological Appraisal. As development plans progress, including measures to deliver BNG, a full BNG Assessment can be undertaken.

Here's where to find all the information you need:

For planners:
Draft BNG Planning Practice Guidance -

For Ecologists:
Calculating biodiversity value -
Statutory Biodiversity Metric -
Habitat Management and Monitoring Plan -

For developers:
Meeting BNG requirements for developers -
On-site BNG for developers -
Off-site BNG for developers -
Statutory Biodiversity Credits -
Statutory Credit Prices -

For Land Mangers:
Meeting BNG requirements -
Selling biodiversity units -

For Legal Minds:
Biodiversity Gain -
Biodiversity Gain Site Register -
Irreplaceable Habitat -
Exemptions -
Modifications and amendments -

Tyne Ecology can help:

  • Ecological surveying of development and potential offset sites
  • Calculating biodiversity metrics (BNG Assessment)
  • Professional guidance on the creation and enhancing of habitats
  • Biodiversity Offset Management Plans
  • Long-term monitoring of offset sites
To discuss biodiversity net gain please call us on 0191 7160275 or email