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Biodiversity Net Gain (BNG) is an approach to development that aims to leave the natural environment in a measurably better state than it was beforehand. BNG is a legal requirement introduced with The Environment Act 2021 and implemented by Schedule 7a of the Town and Country Planning Act 1990 
. BNG is in addition to any other biodiversity measures that may be required e.g. requirements to provide compensatory habitat for protected sites, habitats or species. Further information on BNG can be found on the GOV.UK website .
BNG is being introduced in two phases. From 12 February 2024 all 'larger developments' will be eligible and from 2 April 2024 'smaller' developments will become eligible. Every eligible planning permission for the development of land in England shall be deemed to have been granted subject to the following general biodiversity gain condition:
Development may not be begun unless
This general planning condition cannot be removed, modified or disapplied.
BNG requires the submission of a Biodiversity Gain Plan post-permission. However, all eligible applications will need to submit information that meets the national minimum requirements .
A minimum of 10% BNG is mandatory for all new applications which meet the following criteria:
For housing, development where 10 or more homes will be provided, or the site has an area of 0.5 hectares or more. For non-residential development it means additional floorspace of 1,000m2 or more, or a site of 1 hectare or more, or as otherwise provided in the Town and Country Planning (Development Management Procedure) (England) Order 2015.
Individual householder applications are exempt from BNG requirements, as are certain other development types. Further information on exemptions can be found on the GOV.UK website .
BNG delivery will require specialist technical input, normally from a professional ecologist. BNG can only be calculated using the Statutory Biodiversity Metric . It is strongly recommended that specialist expertise is sought and that applicants engage in pre-application discussions with Fareham Borough Council to ensure that mandatory BNG can be delivered.
The consultation on the Biodiversity Net Gain Supplementary Planning document, which took place between Monday 17th April and Tuesday 30th May 2023, is now closed.
Details of the consultation are set out in the links below. Further details of the next stages will be published here in due course.
Biodiversity Net Gain Supplementary Planning Document (SPD)
Draft Biodiversity Net Gain SPD 
(570 KB) (March 2023)
Strategic Environmental Assessment Screening Assessment for Biodiversity Net Gain SPD (401 KB)
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