{"metric":{"rulebook_id":"terrachrona-sbm-england","rulebook_version":"1.0.0","metric":"Statutory Biodiversity Metric (England), area habitats module","source":{"publisher":"Department for Environment, Food & Rural Affairs (DEFRA)","collection":"https://www.gov.uk/government/publications/statutory-biodiversity-metric-tools-and-guides","calculation_tool":{"title":"Statutory biodiversity metric calculation tool (macro disabled)","version":"1.0.4","released":"2025-07-03","url":"https://assets.publishing.service.gov.uk/media/6867e62810d550c668de3b4e/The_Statutory_Metric_Macro_Disabled_1.0.4.xlsx","sha256":"ecf81786e8c6d540ae1469f8f159226ae9e437ca0cff04fdd13820b1a321d3e8","tabs_used":["G-1 All Habitats","G-3 Multipliers","G-4 Temporal multipliers","G-5 Enhancement Temporal","G-8 Condition Look up","Credits calculations","A-1..A-3 and D-1..D-3 unit formulae","Headline Results"]},"user_guide":{"title":"The Statutory Biodiversity Metric: User Guide","last_updated":"2026-06","url":"https://assets.publishing.service.gov.uk/media/6a1d98e9c7335e2ca6daadd5/The_Statutory_Biodiversity_Metric_-_User_Guide_-_June_2026.pdf","sha256":"2469eb232c2eae501f2f3ba0babcba205a8a8504ef3fbd7351fb8d44f2659d3e"},"condition_assessments":{"title":"Statutory Biodiversity Metric Condition Assessments (Technical Annex 1)","version":"1.0.2 (July 2025)","url":"https://assets.publishing.service.gov.uk/media/689c5f19d2a1b0d5d1bb1254/Statutory_Biodiversity_Metric_Condition_Assessments_-_July_2025.xlsx","sha256":"1553050c29c348b37d907730b61ce12c8ff3ee837c68f519cd80e5fb4b13d877"},"credit_prices":{"url":"https://www.gov.uk/guidance/statutory-biodiversity-credit-prices","page_last_updated":"2026-06-02"},"verified_on":"2026-10-14"},"validation_status":"VERIFIED (area habitats module) against DEFRA statutory metric calculation tool v1.0.4 and the June 2026 user guide. All 132 area habitat rows were generated directly from the tool's G-1, G-4, G-5, G-8 and Credits calculations tabs; global multipliers and unit formulae were checked cell by cell. Not covered: hedgerow and watercourse modules (not implemented), the tool's per-habitat trading-summary netting (approximated by parcel allocation), individual-tree RPA area calculation, and bespoke-compensation agreements. Outputs remain an aid to, not a substitute for, the official tool submitted to the planning authority.","net_gain_target":0.1,"temporal_discount_rate":0.035,"temporal_cap_years":30,"max_temporal_years":32,"temporal_note":"Tool tab G-4 lists 0.965^n for n = 0..31 plus a '30+' row equal to 0.965^32 (0.3198). Any final time to target above 30 years is reported as '30+'.","statutory_credits_per_unit":2,"statutory_credit_note":"Credits calculations tab: credits required = 2 x unit shortfall in each tier. Tier is set by the habitat whose loss is not compensated (V.High -> A5; High -> per-habitat tier; Medium -> by broad habitat group; Low/V.Low and any residual net gain deficit -> A1). 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