Biodiversity Net Gain requirements involve several key components that collectively aim to ensure that development projects positively impact biodiversity and ecological systems.
Biodiversity Gain Plan
To implement Biodiversity Net Gain effectively, developers must conduct a thorough baseline assessment of the site's existing biodiversity.
This assessment serves as a reference point against which the post-development biodiversity will be measured.
Biodiversity Metric and Minimum Net Gain Percentage
The implementation of Biodiversity Net Gain hinges on accurate assessment.
A standardised biodiversity metric is employed to gauge the biodiversity value of a site before and after development. The metric uses habitats as a proxy for biodiversity value.
It does not address impacts on species, nor recognise the significance of site designations, or take account of indirect impacts, cumulative impacts, or in-combination impacts.
By comparing the pre-development baseline and post-development scenario, the metric can, therefore, assess how a development will impact the biodiversity value of a site.
The biodiversity gain objective is met if the biodiversity value attributable to the development exceeds the pre-development biodiversity value of the onsite habitat by at least 10%.
Biodiversity Offsetting
Developers are encouraged to follow a hierarchy of mitigation measures to avoid, minimise, restore, and offset impacts to biodiversity. Avoiding or minimising impacts to biodiversity should be prioritised.
In some cases, it may be challenging to achieve net gain on the development site itself.
Biodiversity offsetting enables developers to impair the habitat value of a site, provided they pay to restore another habitat site that has the potential to become at least the same quality as the habitat that will be lost.
Securing Biodiversity Net Gain
Significant increases in onsite biodiversity value can only be considered by the local planning authority as part of the post-development biodiversity value if they are secured through a suitable mechanism such as a planning condition or section 106 agreement and will be maintained for at least 30 years after the completion of development.
In order to secure off-site gain, the biodiversity gain site register is used. The core purpose of the register is to record allocations of off-site biodiversity gains to developments and make this information publicly available.
Biodiversity gain sites are sites that are bound by a planning obligation or conservation covenant, which requires habitat enhancement works to be carried out on the land and maintained for at least 30 years following completion.
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