Biodiversity Net Gain is development that leaves biodiversity in a better state than before. In partnership with both CIRIA and CIEEM, we have developed principles and guidance to help professionals and UK industry address this challenge. An important part of delivering good practice in Biodiversity Net Gain is to know what it looks like. A project group of professionals from each member organisation worked in 2016 to develop good practice principles to guide developers. Draft principles were refined following consultation with stakeholders including government, NGOs and industry and also from testing through workshops and webinars with over 450 professionals. Our principles sit at the core of achieving Biodiversity Net Gain and are freely available below, along with a new series of case studies.

Detailed guidance for professionals is also now available, free to IEMA members for download and with an option to purchase in a printed fomat.

Biodiversity Net Gain – Principles and Guidance for UK Construction and Developments

Biodiversity Net Gain- Good Practice Principles for Development. A Practical Guide

Biodiversity Net Gain- Good Practice Principles for Development. Case Studies

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Biodiversity Net Gain- Good Practice Principles for Development. A Practical Guide is available to purchase in hard copy from our online shop- CLICK HERE

This guide is also available on our project partners websites- CIRIA, CIEEM


  • Introducing the Guidance 2019- Click here
  • Watch our *Biodiversity Net Gain Principles webinar for members of IEMA, CIEEM and CIRIA - click here.
  • Watch our Biodiversity Net Gain Guidance in Construction and Development – Have Your Say- click here

*This webinar was attended by over 450 professionals. A document responding to questions submitted is also available here

  • Biodiversity Net Gain: Introduction to Principles & Challenges for Developing Guidance Workshop, view the presentations and the December 9th workshop write up here

We continue to share the Principles with professionals, stakeholders and industry. Our ongoing objective is to inform and develop good practice, we welcome comments and feedback from stakeholders. Feedback on the Principles can be submitted to

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