Guidance confirms that net gains should normally be delivered on site. However, where achieving biodiversity net gain is not possible on site whilst still delivering a viable project; developers have the option to contribute at a local or regional scale to off-site Offsetting or Compensation. This approach can often successfully result in greater gains for biodiversity than could be provided within a constrained development site. It supports delivery of Local Nature Recovery Strategies and is consistent with the central conclusion of the 2010 report ‘Making space for nature’, that we need more, bigger, better and joined up habitats.

Referring back to the Spatial Strategy Options, the medium and higher levels of growth options are much more likely to be able to deliver the biodiversity and green infrastructure improvements and contributions required, than on existing brownfield sites, as confirmed within the Integrated Impact Assessment:

“The medium and higher growth options are also noted for their potential to support the delivery of strategic green infrastructure provisions and associated biodiversity net gain. This includes improvements being explored in the green infrastructure network across the sub-region through the South Essex Green and Blue Infrastructure Study (2020), such as the Regional Parkland. The Regional Parkland has the potential to act as alternative greenspace targeted at reducing recreational pressures at designated biodiversity sites. These options thus provide a greater contribution to the principles of the Essex Coast Recreational disturbance Avoidance & Mitigation Strategy (RAMS).

The lower level of growth will mainly result in the delivery of new homes on urban and brownfield sites so has greater potential to avoid designated sites and support urban greening to some extent. The urban focus however is less likely to bring forward strategic mitigation, such as the Regional Parkland to mitigate the recreational pressures on designated biodiversity resulting from a growing population. As a result, the medium and higher growth options are considered more likely to perform better overall in relation to this IIA theme; however, the potential for a significant effect is uncertain as will be dependent on the location of growth.”

It continues:

“…the potential for larger-scale development under Options 2a and 2b is recognised for the potential for greater net gains in biodiversity.”