Biodiversity Net Gain
Guides & Resources

Everything developers, landowners, and ecologists need to know about BNG compliance in England.

What Is Biodiversity Net Gain? A Developer's Complete Guide

Since February 2024, every planning application in England must demonstrate a 10% biodiversity net gain. Here's what that means for your development — costs, timelines, what you actually need to submit, and how to avoid the most common mistakes.

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Small Sites Metric Explained: Do You Need an Ecologist?

The Small Sites Metric (SSM) is the simplified version of the statutory biodiversity metric for sites under 1 hectare with no priority habitats. A "competent person" can complete it — no ecologist required. We break down exactly when you can use it and how it works.

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Free BNG Screening Report: Know Your Site in 60 Seconds

Draw a boundary on our satellite map and get an instant biodiversity screening report. Seven government data layers, statutory biodiversity metric scoring, and a downloadable PDF. Here's how it works and what you'll get.

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BNG for Ecologists: Auto-Populated Baselines from Open Data

Stop starting from scratch. BioGain pre-fills your baseline from Natural England's Priority Habitat Inventory, ancient woodland data, SSSIs, BGS soil data, EA flood maps, LIDAR, and NBN Atlas species records. Edit what needs editing. Skip the data gathering.

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How Much Does a BNG Assessment Cost in 2026?

Ecologist fees range from £2,000 to £10,000+ per site. Statutory biodiversity credits cost £42,000+ per unit. We compare the costs of manual surveys, automated tools, and off-site credits — and explain when each makes sense.

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