Biodiversity Net Gain (BNG %) quantifies the positive impact a property development has on local ecosystems, expressed as a percentage increase in biodiversity compared to pre-development conditions. In UK property development finance, BNG % plays a crucial role in securing planning permission, meeting ESG reporting standards, and supporting sustainable project valuation. Developers achieve BNG through habitat creation, restoration, or enhancement. Lenders and investors use BNG % to assess environmental risk and alignment with corporate responsibility objectives. Calculations are based on ecological surveys and recognised metrics, integrating ecological performance into financing decisions and regulatory compliance.
This sits beneath Environmental Performance, introducing a more specific variant of the measure without changing its core interpretation. It is commonly considered alongside Urban Biodiversity Index (Pre vs Post Development), as both are closely related measures used to assess similar aspects of performance or risk.
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