What is a BNG assessment in the UK?

A Biodiversity Net Gain (BNG) assessment is a mandatory calculation for most UK planning applications since February 2024, under the Environment Act 2021. It measures the biodiversity value of a development site before and after construction using the Statutory Biodiversity Metric 4.0, and the developer must deliver at least a 10% uplift in biodiversity units. BioNetGain Pro produces a legally compliant BNG report in under 30 minutes.

How much does a biodiversity net gain report cost in the UK?

A BioNetGain Pro BNG report starts at £95 for sites under 0.1 hectares (micro sites). Pricing scales with site area: small sites (0.1–0.5 ha) from £195, minor developments (0.5–1 ha) from £295, and major developments (1+ ha) from £495. This is 70–90% cheaper than a traditional ecological consultancy, which typically charges £2,000–£8,000 and takes 5–10 working days.

Is BioNetGain Pro BNG report legally compliant?

Yes. Every BioNetGain Pro report uses the DEFRA Statutory Biodiversity Metric 4.0, produces a Biodiversity Gain Plan (BGP) in the Natural England-accepted format, and includes a 30-year Habitat Management and Monitoring Plan (HMMP) alongside Section 106 or Conservation Covenant legal mechanism drafting. Reports are accepted by all 317 UK Local Planning Authorities.

Which development sites need a BNG assessment?

Since 12 February 2024 most major developments in England require a 10% BNG uplift. Since 2 April 2024 small sites (fewer than 10 dwellings, or under 0.5 hectares) also require BNG. Nationally Significant Infrastructure Projects (NSIPs) come into scope in late 2025. Exemptions include householder applications, change-of-use without development, and de minimis sites under 25 m² of habitat impact.

How does the BNG calculator work?

The BioNetGain Pro BNG calculator uses the Statutory Biodiversity Metric 4.0 formula: biodiversity units = area (ha) × habitat distinctiveness × condition × strategic significance × spatial risk × temporal risk. We automate the baseline assessment with AI-processed satellite imagery via our partnership with Gentian True Sight, then apply the developer's planned scenario to calculate post-development units and the 10% gain target.

How long does a BNG report take?

A BioNetGain Pro report is delivered within 30 minutes of boundary submission. This compares with 5–10 working days for a traditional ecological consultancy. The speed comes from our AI-driven baseline habitat mapping and the automated Metric 4.0 calculation engine.

Do I need a PEA as well as a BNG report?

In most cases, yes. A Preliminary Ecological Appraisal (PEA) covers protected species, designated sites, and construction impacts — it is a separate statutory requirement from BNG. BioNetGain Pro handles the BNG compliance layer: metric calculation, HMMP, submission pack, trading rules, off-site options, and S106 drafts. Your ecologist handles the PEA. Together, the two documents satisfy the complete ecological requirements for your planning application.

Why do LPAs reject BNG reports?

The most common reasons LPAs reject BNG submissions are: no Habitat Management and Monitoring Plan (HMMP), no committed pathway to achieving 10% net gain (just a generic statement that options exist), missing trading rules analysis, no costed off-site compensation comparison, and no mitigation hierarchy narrative. BioNetGain Pro includes all of these as standard in every submission pack, giving the LPA confidence that the biodiversity gain condition is capable of being discharged before determination.

BNG Report Cost 2026: How Much for Biodiversity Net Gain Compliance?

The True Cost of BNG Compliance

Biodiversity Net Gain compliance costs vary enormously depending on your site size, location, and chosen approach. Understanding the full picture helps you budget accurately and avoid surprises.

Traditional Ecology Consultant Costs

A typical ecology consultant will charge:

£3,200 to £8,000 for a BNG assessment and compliance report (sites under 5 ha)
£2,000 to £5,000 extra for the Habitat Management and Monitoring Plan (HMMP)
£500 to £1,500 for DEFRA metric completion
4 to 8 weeks turnaround time

Total: £5,700 to £14,500 for a complete submission pack, plus a significant time delay.

BioNetGain Pro Pricing

Our AI-powered platform delivers the complete submission pack — BNG Compliance Report, JP058 HMMP, DEFRA export, monitoring dashboard, and LPA verification link — from £295 ex VAT. Delivery time: under one hour.

Side-by-Side Comparison

For a typical small residential site under 1 hectare:

Consultant: £5,000 to £10,000 · 6+ weeks
BioNetGain Pro: £295 · under 1 hour
Saving: 94-97%

When Might You Still Need a Consultant?

For sites with irreplaceable habitats, complex protected species concerns, or sites requiring a full Phase 2 ecological survey, a specialist ecologist remains essential. BioNetGain Pro is designed for the majority of standard developments where the baseline can be established from satellite imagery.

BNG Costs in 2026: How Much Does a Biodiversity Net Gain Report Cost?

The True Cost of BNG Compliance

Traditional Ecology Consultant Costs

BioNetGain Pro Pricing

Side-by-Side Comparison

When Might You Still Need a Consultant?

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