BNG Calculatorv4.0 / JP039
Statutory Biodiversity Metric v4.0 (JP039)· Defra GOV.UK guidance, last updated 2 June 2026· NSIP extension live 2 November 2026· Reviewed 21 June 2026

BNG calculator sources: primary citation index

Every numeric claim on this site is back-referenced to a primary source. The list below indexes the sources, what they support, and when each was last verified.

Awaiting MCIEEM peer review · CIEEM (Chartered Institute of Ecology and Environmental Management)
IDSourceUsed byVerified
S1Statutory Biodiversity Metric Calculation Tool, User Guides and Technical Annexes (JP039)
Natural England
6 pages2026-06-21
S2Statutory biodiversity metric tools and guides
Defra (GOV.UK)
5 pages2026-06-21
S3Statutory biodiversity credit prices
Defra (GOV.UK)
3 pages2026-06-21
S4Biodiversity net gain exempt developments
Defra (GOV.UK)
3 pages2026-06-21
S5Biodiversity gain sites register
Defra (GOV.UK)
9 pages2026-06-21
S6Professional Guidance and Standards
CIEEM
3 pages2026-06-21
S7Conservation covenant agreements and designated responsible bodies
Defra (GOV.UK)
2 pages2026-06-21
S8Off-site BNG Unit Market Report (February 2026)
Biodiversity Units UK
2 pages2026-06-21
S9Biodiversity net gain and nationally significant infrastructure projects (NSIP)
Defra (GOV.UK)
2 pages2026-06-21
S10Biodiversity net gain post-implementation review
Defra (GOV.UK)
2 pages2026-06-21
S11Local Nature Recovery Strategies
Defra (GOV.UK)
2 pages2026-06-21
S12PAS: Biodiversity Net Gain
Local Government Association
2 pages2026-06-21
S13Biodiversity Net Gain data portal
Environment Agency / Defra
4 pages2026-06-21
S14Biodiversity net gain frequently asked questions
Defra (GOV.UK)
3 pages2026-06-21
S15Woodland Carbon Code standards
Woodland Carbon Code
1 pages2026-06-21
Related pages
ReviewerChangelogFormulaCost per unitStatutory credits