Biodiversity Accounting

The Buckinghamshire and Milton Keynes Natural Environment Partnership is working with its partners to put into place a robust and transparent scheme for ensuring that development results in net biodiversity gains across the Bucks and MK area.

We are working on:

  • producing a metric to calculate the impact of development on biodiversity which is aligned to the current Defra metric
  • ensuring that all development minimises impacts on biodiversity in the first place and only seeks offsite-offsets for biodiversity losses once all opportunities on-site have been exhausted
  • setting up the mechanisms of the scheme to ensure that any biodiversity offsets required by development are located according to biodiversity priorities and needs across Buckinghamshire and Milton Keynes.  This includes setting up a NEP-run Expert Panel to regularly review the biodiversity offset requirements and recommend to local authorities the best available match with biodiversity net gain schemes to achieve biodiversity objectives and priorities across Buckinghamshire and Milton Keynes.
  • a plain-English “how to” guide as to how the scheme works
  • liaising with land-owners to determine whether there are opportunities for net gain offset schemes on their land

In March 2020, the NEP Board approved a model “Supplementary Planning Document” (SPD) that sets out the detailed workings of the approach and is available for local authorities to use to tailor to their Local Plans and publicly consult on.

Download our model Supplementary Planning Document here.


In line with the NEP’s “model” SPD, until the Bucks & MK metric is available, we would recommend using the latest version of the Warwickshire County Council metric for biodiversity impact assessment calculations. The latest version of this metric, as well as accompanying guidance on its use and other background documents and evidence, can be found on the Warwickshire County Council website [external link].

Further details will be released when they are finalised.