ISO 17620:2025

The Biodiversity Net Gain (BNG) standard will provide guidance on the design and delivery of gains for biodiversity through the lifecycle of a project. The standard will set out the requirements for delivering BNG at each stage of a project, from preparation through design and implementation and into maintenance and monitoring. It will be applicable to all scales of development or conservation projects. The standard will draw together and build on existing work providing one version of BNG, enabling organisations to check when gains are delivered and clearly state when the standard has been met. The standard will enable greater transparency on delivery and contribute to demonstrating biodiversity net positive commitments. It will apply to a broad range of potential users including auditors, developers, conservation organisations, land managers, consenting organisations and investors. The BNG standard will link to existing work and examples to assist understanding and facilitate implementation of the guidance.