Defra has announced that biodiversity net gain will go live on 12 February 2024. From this date major development (unless otherwise exempt) will have to deliver net gains for biodiversity leading to positive outcomes for nature, better places for local communities and more consistent and transparent requirements for developers.

Which types of development will BNG apply to?

From 12 February 2024, BNG will be mandatory for new planning applications for major development made under the Town and Country Planning Act (TCPA) 1990, subject to the confirmed exemptions. Major development includes residential developments with 10 or more dwellings, or where the site area is greater than 0.5 hectares.

BNG for small sites will have an extended transition period and will apply from 2 April 2024. The definition of small sites is summarised below. Small site development includes:

• Residential development where the number of dwellings is between 1 and 9, or if unknown the site area is less than 0.5 hectares
• Commercial development where floor space created is less than 1,000 square metres or the total site area is less than 1 hectare

What types of planning permission will BNG apply to?

We have prioritised the introduction of BNG for planning applications – which is the predominant route to securing planning permission. From 12 February, BNG will apply to new applications for planning permission, except for applications for retrospective permission, the exemptions and transitional arrangements set out below.

Applications made under any other route, for example deemed permissions under section 90 TCPA 1990 or permission granted by a Local Development Order, will not be subject to mandatory BNG yet. Further regulations will be required to modify the procedure for these other routes to planning permission. We will release further information on this in due course.

Developers may still deliver voluntary BNG on these developments under existing planning policy.

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