The Statutory Requirement
In 74 local planning authorities across the UK (as of 2024), housing developments cannot proceed unless they can prove "nutrient neutrality" regarding phosphorus and nitrogen runoff into protected catchments (e.g., the Solent, River Wye).
| Development Size | Est. Phosphorus (kg/yr) | Offset Land Required (Wetland) |
|---|---|---|
| 10 Houses | 8.0 kg | ~1 Hectare |
| 100 Houses | 80.0 kg | ~10 Hectares |
Common Mistakes
Assuming agricultural land reversion is an instant fix. Highly fertilised land leaks phosphorus for years after farming ceases. Constructed wetlands are often required to actively strip the nutrients.
FAQ
Can I sell nutrient credits and BNG on the same land?
Yes, "stacking" is generally permitted for nutrient neutrality and BNG, as they solve two different statutory problems (water quality vs habitat loss).
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