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BNG Guide: Off-site Units and the Gain Site Register

Oliver Lewis avatar
Written by Oliver Lewis
Updated over a year ago

At its heart, Biodiversity Net Gain (BNG) requires people involved in submitting planning applications to secure Biodiversity Units (BUs) - either by creating or enhancing units onsite ("On-site units) or by purchasing BUs from other providers ("Off-site Units"). If they don't have enough BUs, they cannot commence development.

You should only purchase Off-site Units if you are unable to secure the necessary BNG uplift on your site.

In order to buy (or sell) off-site Units, those units need to be registered with the Biodiversity Gain Site Register. It is operated by Natural England on behalf of the Government. The Gain Site register allows:

  • Landowners participating in off-site BNG to apply to register their site

  • Developers to view unallocated off-site habitat enhancements

  • Local planning authorities to view allocated and unallocated habitat enhancements as part of their checks on a submitted gain plan

How do I create Off-Site units?

To create and sell off-site units, you will need to follow several steps:

  1. Work out which plot of land you want to create a biodiversity uplift on and then run an analysis on how many BUs you can create via different enhancements and creation options (you can use Joe's Blooms Explore to do this). When you have found a solution you like, and you are prepared to maintain for 30 years, you need to draw this up into a detailed plan.

  2. Produce a Biodiversity Metric Sheet and Biodiversity Gain Plan showing the intended habitats you plan to enhance and/or create on the plot of land (you can use Joe's Blooms' tools to help with this).

  3. Secure planning permission from your Local Planning Authority (LPA), stating your intent to create a Biodiversity Gain Site. You will need to - either via a section 106 agreement or a conservation covenant - agree to maintain the site for at least 30 years.

  4. Once you have permission, you will need to register the site with the Biodiversity Gain Site Register.

How do I register with the Biodiversity Gain Site Register?

The Register can be found here. Please note, you’ll need a Government Gateway account and a Defra account to sign into this service. If you do not have a Government Gateway account or a Defra account, you can set both up when you use this service for the first time.

To register an off-site units You’ll need:

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