Biodiversity Net Gain Calculator -- calculate habitat units, assess net gain against the mandatory 10% target, and get habitat creation recommendations.
Since February 2024, all major English planning applications must demonstrate a minimum 10% Biodiversity Net Gain. This tool provides a simplified Defra Metric 4.0 calculation — comparing baseline habitats against post-development proposals to determine if the 10% threshold is met.
Enter existing habitats on site before development (Defra Metric 4.0 methodology)
Enter proposed habitats after development, including retained, enhanced, and created habitats