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Biodiversity Net Gain

Biodiversity Net Gain (BNG) is a simple concept, meaning that development sites leave wildlife in a better state than it was found in, whereby developments result in a quantifiable net gain of typically 10%. This gain can be achieved through a number of ways, including enhancing biodiversity on-site alongside appropriate mitigation for any unavoidable losses. Where on-site enhancement may not be feasible, net gains can also be attained off-site.

To quantify gains and losses, the Statutory Metric can be utilised, whereby existing and proposed post-development habitats, with their associated area and condition can be inputted. A percentage denoting overall net loss of gain is then contained within the output (see below).

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Following enactment of the Environment Bill, BNG is mandatory from February 2024 for the majority of developments, whilst local authorities are requesting net gain assessments more regularly, which is also in line with their legislative and policy-related obligations to biodiversity.

Tyrer Ecological Consultants Ltd are fully trained in using the Statutory Metric and the Small Sites Metric, and previous iterations of the DEFRA Metric, and are happy to offer this service to all clients who are in need of a BNG assessment! This includes MoRPH appraisal for riverine habitats!



Would you, your company or organisation benefit from an open and honest conversation with expert Ecologists about BNG?

Are you...

  • unsure about how to begin the BNG process?

  • scoping a project that might require BNG assessment?

  • wanting to integrate nature-based solutions into your project?


  • have you encountered issues during a BNG related project?

  • are you concerned about how you are going to navigate BNG obligations / offsets?

  • are you keen to add knowledge of BNG to your CPD for 2024?

We are confident we can support you.


If you are interested in having a trained and experienced Ecologist lead a session for you and your team explaining the do's and don't's of BNG, what information you need before a BNG assessment can be undertaken, and what options are available to you following completion of the assessment, please don't hesitate to get in touch!

We can offer presentations to small groups, or host meetings to talk you through BNG on a more informal basis.

Get Your Free Quote

Tyrer Ecological Consultants
Roselands, Suite 1,

3 Cross Green, Formby

L37 4BH

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