Biodiversity Net Gain

An approach to development that leaves biodiversity in a better state than before

Biodiversity Net Gain

The principle of BNG has been part of national and local planning policy for some years. However, the forthcoming Environment Bill (2019-21) will make BNG a requirement of planning permissions in England. A two-year implementation period is anticipated, with mandatory BNG likely to come into force around 2023. The requirements for delivering BNG is already present in some emerging and adopted local plans and is clearly something which will need to be accommodated in all new developments.

Biodiversity Gain Objective.

Under the forthcoming bill, planning permission will be subject to a condition to secure the ‘biodiversity gain objective’. This objective is met when the biodiversity value of the proposal exceeds the pre-development value of the site. This is currently set at 10%, but subject to review by the Secretary of State. This Biodiversity Value is calculated as:

  • The post-development biodiversity value of the onsite habitat;
  • The biodiversity value, in relation to the development, of any registered offsite biodiversity gain allocated to the development, and
  • The biodiversity value of any biodiversity credits purchased for the development.

A Biodiversity Metric is how biodiversity value, and any gains, will be measured. This metric is currently in Beta testing phase and is due to be published in Autumn 2020.

A Biodiversity Gain Plan will need to be approved by the Local Planning Authority. Importantly, a Biodiversity Gain Plan will need to include “…information of how steps taken or to be taken to minimise the adverse effect of the development on the biodiversity of the onsite habitat and any other habitat”. This requirement reinforces the need for good design and adoption of the “Mitigation Hierarchy”.

How CSA can help:

  • At the Due Diligence stage CSA can provide you with an early assessment of the likely implications of BNG requirements for a project to input into your budgetary and contractual decisions.
  • We can provide expert advice for Land Promotion to help guide your site through the development plan process, ensuring allocations are robust and deliverable in respect of BNG.
  • With planning applications CSA can draw upon their wealth of experience to ensure your application is compliant with the relevant BNG policy and legal requirements to avoid unnecessary delays or costs. We do this by drawing on our core disciplines to provide a ‘one-stop-shop’ for your BNG requirements:
    • Our Ecologists have the expertise and experience to manage the BNG process – surveying, mapping and establishing baselines, running biodiversity metric calculation, advising on scheme design and identifying off-site solution.
    • Our Urban Design team can optimise your scheme to minimise biodiversity losses on-site alongside other design considerations.
    • Our Landscape Architects can maximise the biodiversity value of landscaping on-site.

For more information contact our dedicated teams in email hidden; JavaScript is required, email hidden; JavaScript is required or email hidden; JavaScript is required.