The Government has announced proposed changes to Biodiversity Net Gain (BNG) rules that could significantly reduce planning requirements for smaller developments in England. Subject to the necessary legislation being introduced, a new exemption for development sites measuring 0.2 hectares or less is expected to come into force from 31 July 2026. 

For the agricultural sector, the proposed changes could remove a substantial amount of cost and complexity from smaller farm developments, including livestock buildings, machinery stores, grain stores and other operational farm infrastructure. 

Under the current system, most full planning applications require a minimum 10% biodiversity net gain, often involving ecological surveys, habitat assessments and biodiversity metric calculations. While intended to improve environmental outcomes, these requirements can be disproportionate for relatively small-scale rural developments with limited ecological impact. 

The proposed 0.2 hectare exemption forms part of wider Government plans to simplify the BNG process for smaller sites. Defra has indicated that a significant proportion of minor developments may benefit from the changes once implemented. 

However, there are important limitations and uncertainties to be aware of. The exemption is not expected to apply where priority habitats are present or affected. Features such as species-rich grassland, important hedgerows, ponds, woodland edges or open mosaic habitats may still trigger ecological assessment requirements regardless of site size. 

In addition, local planning authorities are still expected to consider wider ecological impacts, protected species and habitat constraints as part of the planning process, even where BNG itself may be exempt. 

As the detailed legislation and guidance continue to evolve, early planning and ecological advice will remain important for farmers and rural businesses considering future development projects. At Kivells, we advise farmers, landowners and rural businesses on agricultural planning applications, helping applicants navigate changing BNG requirements and the wider planning process. 

Contact our experienced team today for expert advice.