Biodiversity Net Gain

Biodiversity Net Gain

What is Biodiversity Net Gain?

In England, the Environment Act (2021) stipulates that a minimum of 10% Biodiversity Net Gain (BNG) is required under a statutory framework introduced by Schedule 7A of the Town and Country Planning Act (1990). This was implemented for large sites on the 12th February 2024, with smaller developments to follow on the 2nd April 2024. Developers will be required to work with local governments and wildlife groups in addition to landowners and other stakeholders to support priorities for nature conservation.

How is it Assessed?

The following key processes are involved:·

  • Baseline Assessment: Habitat survey and condition assessment through site visits and digital mapping, checking of local policies and input into the Biodiversity Metric.
  • Comparison of pre-development habitats with post-development habitats, using a landscaping plan.
  • Delivery of 10% (or more) BNG through habitat creation or enhancement on-site, habitat creation or enhancement off-site or through the purchase of ‘Biodiversity Credits’ from local or central government schemes. 

What do I need to do?

Early engagement with experienced ecologists will be key to meeting relevant targets and ensuring commercial viability of developments. Mortimer Environmental and our partners use CIEEM, CIRIA and IEMA key principals to undertake BNG assessments and deliver BNG targets. We provide complete solutions for delivery of BNG, from consultation with planners and input into design plans, initial habitat surveys, liaising with relevant stakeholders on your behalf as well as providing any on-site landscaping and ecological supervision required during the delivery phase, complete with ecological management plans and future habitat assessments.


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