Biodiversity Net Gain
Biodiversity Net Gain is a mandatory element of the planning system, and a general approach to development and land management that aims to leave the natural world in a measurably better state than it was beforehand, and create opportunities for important ecological features associated to the proposed works.
Biodiversity net gain involves a metric, which allocates quantifiable numerical values ('biodiversity units') to the relative biodiversity value of baseline (pre-development) on-site habitats, and compares them to those anticipated post-development. The biodiversity net gain or loss is then calculated, based on the difference between the pre-development and post-development habitat data. It is used to inform the emerging scheme design, enabling significant ecological effects within the zone of influence to be avoided, mitigated, or compensated for, where necessary, ensuring compliance with nature conservation legislation and planning policy.
​
The assessment entails an initial field survey, to collect baseline habitat data. Post-development habitat data is derived from landscaping plans. Both sets of data are then converted into biodiversity units using a metric. The resultant calculation is presented as a percentage of net gain or loss.
Biodiversity net gain relies on the application of the traditional mitigation hierarchy (to avoid, mitigate, compensate for biodiversity losses), though it expands on this by compelling developers to demonstrate a 10% net gain for most new developments. Where such a score cannot be achieved on site, off-site compensation may be incorporated into the metric - 'biodiversity offsetting'. The off-site biodiversity units (or credits) must be allocated or purchased in advance of the commencement of works. Each biodiversity net gain assessment is accompanied by a thirty year management plan, specifying management compartments, objectives, and prescriptions, and detailing resourcing (including financial budgeting) and monitoring, thereby ensuring that the stipulated measures are implemented effectively.
The earlier biodiversity net gain is incorporated into the design scheme, the greater the scope to influence proposals, and the easier it is to deliver efficiently, without abating other project requirements or ambitions. This makes it prudent to plan ahead and consider ecological issues early on in the planning process. A biodiversity net gain assessment at an early stage in project planning and design can therefore deliver significant benefits, avoiding potentially costly and time-consuming delays.​
When
Biodiversity net gain assessments can be undertaken throughout the year, though the optimal season (when habitats can be most accurately appraised) lies between April-September inclusive.
Why Us
With over fifteen years' experience in undertaking ecological surveys, mitigation design, licensing, site supervision, and monitoring, our team of expert ecologists can help guide your project through the planning process.
We can appraise your site in accordance with either Phase 1 Habitat Survey, or UK Habitat Classification methodology, depending on project requirements.
​
By working closely with our clients, we ensure that their developments progress smoothly and in full compliance with the law, orchestrating the best possible outcome for them and the natural world.
