BNG §1:100 · units
BNG unit cost calculator
Direct answer · 53 words
BNG cost equals the number of biodiversity units needed at 10% net gain multiplied by the per-unit cost at the chosen delivery route. On-site habitat creation is cheapest per unit but constrained by red line. Off-site market units range widely by region. Statutory credits carry a deliberate multiplier to keep them as a last resort.
BNG §1:100 · unit costBCIS rebase 2026 Q2 · SPDs hand-verified
Headline £/dwelling
£15,370
above median £14,500/dwelling
S106 sub-total
£768,500
Combined total
£768,500
Birmingham City Council · SPD: 2021
Affordable housing commuted sum
15% shortfall x 8 dwellings @ £38,000/dwelling
£304,000
Education
50 dwellings @ £5,400/dwelling
£270,000
Open space + play
50 dwellings @ £1,900/dwelling
£95,000
Healthcare (primary care)
50 dwellings @ £700/dwelling
£35,000
Transport (urban-brownfield x1)
50 dwellings @ £1,200/dwelling
£60,000
Monitoring fee
6 obligations @ £750/obligation
£4,500
BNG §1:50 · price tiers
Delivery-route price stack
| Route | Typical £/unit range | Notes |
|---|---|---|
| On-site habitat | £10,000 to £35,000 | Constrained by red line; cheapest where land is available. |
| Off-site market unit | £20,000 to £80,000 | Habitat bank or landowner agreement; regional variation. |
| Statutory credit (tier 1) | £42,000 baseline | Government-sold; last resort. |
| Statutory credit (last resort) | 2x baseline | Doubled multiplier to discourage routine use. |
Pricing per Statutory Biodiversity Credits guidance[Statutory Biodiversity Credits guidance]. The exact tier structure is published by Defra and re-priced periodically.
BNG §1:50 · monitoring
30-year monitoring cost
The 30-year monitoring cost is typically included in the off-site unit price (the habitat bank holds the obligation). On-site delivery requires a separate monitoring contribution covering LPA officer time and corrective management triggers.
BNG §1:50 · related