Mandatory biodiversity compliance for planning applications
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Biodiversity Net Gain (BNG) is now a legal requirement for most planning applications in England. It ensures that any development results in a measurable improvement to biodiversity compared to the pre‑development baseline.
Planning World prepares fully compliant BNG assessments, habitat calculations, mitigation strategies, and biodiversity plans to support planning applications for extensions, new builds, conversions, and multi‑unit developments.
When you need Biodiversity Net Gain
BNG is required for:
New build houses and flats
Large extensions that impact gardens or green space
Conversions that alter external areas
Developments affecting habitats, trees, or vegetation
Sites within sensitive ecological areas
Any project where the council requests a BNG plan
Major developments (mandatory 10% BNG)
Small sites (mandatory BNG from 2024 onwards)
If your project affects land, vegetation, or habitat, BNG is likely required.
For Biodiversity Net Gain (BNG)
What your BNG package includes
A complete BNG assessment typically includes:
Baseline habitat survey
Habitat classification using DEFRA metrics
Biodiversity unit calculations
On‑site and off‑site mitigation strategy
Habitat enhancement proposals
Planting and landscaping recommendations
Long‑term management plan
Full BNG report for planning submission
Coordination with ecologists (if required)
All reports follow DEFRA’s statutory BNG metric and local authority requirements.
Our process
A structured, planning‑ready workflow:
Site review We assess existing habitats, vegetation, and ecological constraints.
Baseline biodiversity calculation We calculate current biodiversity units using DEFRA metrics.
Mitigation and enhancement strategy We propose habitat improvements to achieve required net gain.
BNG report preparation A full planning‑ready report is produced with all calculations.
Submission & liaison We provide the BNG report to your architect or submit it with your planning application.
Fees
Typical fees start from:
£495–£995 for small residential sites
£995–£1895 for new builds or multi‑unit developments
£1895+ for complex or ecologically sensitive sites
A fixed quote is provided after reviewing your site and drawings.
Borough‑specific considerations
BNG requirements vary between councils. We specialise in:
London boroughs — strict urban greening and habitat enhancement policies
Kensington & Chelsea — limited green space, high scrutiny on planting
Most new developments require BNG, including small sites from 2024 onwards.
If they impact gardens or habitats, BNG may be required.
Yes — if on‑site improvements cannot achieve the required net gain.
For complex sites, yes. For simple residential sites, we can often complete the assessment without one.
It significantly improves your chances by meeting statutory requirements.
Ready to get compliant?
Book a consultation and we’ll assess your site, confirm BNG requirements, and prepare a fully compliant biodiversity report for your planning application.
Ready to get compliant?
Book a consultation and we’ll assess your site, confirm BNG requirements, and prepare a fully compliant biodiversity report for your planning application.
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