Free BNG Marketplace, Calculator, Gain Plan & Survey Tool

Buy biodiversity units, draw your redline, map existing and proposed habitats, auto-complete the BNG metric, detect priority habitats, and download planning-ready biodiversity reports — for landowners or developers.

View BNG Calculator

Free BNG tools — built for UK planning

Everything is designed to help you meet — and show — the 10% Biodiversity Net Gain requirement with minimal effort.

Free BNG Marketplace

Buy biodiversity units directly from providers or list your land to sell units with 0% commission fees. Take ownership of your Natural England registered sites.

  • 0% transaction & ad fees
  • Direct buyer/seller contact
  • Filter by NCA, LPA, & Habitat
Browse Marketplace →

Biodiversity Net Gain Calculator

Trace habitats on the interactive map, tell the system which habitats you're creating or enhancing, and Naturefy auto-completes the biodiversity metric for you — small site or large site.

  • Auto-calculates biodiversity units
  • Experiment with habitat mixes to reach 10%
  • Create biodiversity units for landowners
Open BNG Calculator →

Biodiversity Gain Plan Tool

Pulls in your habitats, unit calculations and trading-rule checks from the calculator to generate a planning-ready BNG Gain Plan PDF — ready for LPAs.

  • Auto-completes BNG plan template
  • Exports PDF for submission
  • Creates planning ready documents
Create a Gain Plan →

Biodiversity Survey Tool

Instantly checks priority habitats and designated sites on or near your redline boundary, and feeds that into your BNG documents.

  • Scans Natural England datasets
  • Gives source IDs for planning
  • Exports survey outputs
Run a survey →

What you can do with Naturefy

From redline sketch to planning-ready BNG paperwork — made simple.

Purchase Biodiversity Units

Find the Biodiversity Units for sale in your area.

Manage BNG Projects

Keep your calculator runs, gain plans, and survey outputs in one account.

Automated Biodiversity Survey
Identify priority habitats within your site

Draft habitat scenarios

Test alternative habitat creations and enhancements to see which maximize BNG unit creation.

Planning-ready reports

Download the completed biodiversity metric (Excel) and BNG plan (PDF) directly from the tool.

Built-in checks

Flag habitat trading-rule issues and priority habitats pulled from the survey tool.

Who Naturefy is for

Small site developers

Automatically complete the Small Site Metric by just drawing habitats. Test “what if” scenarios to hit 10% BNG without spreadsheet work.

Use the calculator →

Landowners & habitat providers

See which habitats on your land are low value, draw improvements, and estimate how many biodiversity units you could generate to sell.

Model habitat gains →

Large/complex developments

Map baselines and proposed habitats, flag trading-rule issues, and generate a planning-ready Biodiversity Gain Plan to share with your LPA.

Generate a BNG plan →

Buy & Sell BNG Units

Use our free BNG Marketplace map to find the exact habitats you need. All unit providers are verified. Developers can securely buy BNG units, and landowners can list their land to sell biodiversity units.

Explore the BNG Marketplace →

Landowners & habitat providers

Model how many biodiversity units you could generate, then list your land on our marketplace to sell units directly to developers with 0% advertising or transaction fees. You can also claim your existing Natural England registered sites.

Sell BNG Units →

Purchasing Units

Use our map to filter available units by NCA, LPA, or Habitat Type. View provider contact details to negotiate and buy BNG units directly, with zero middleman fees.

Buy BNG Units →

Built for real UK planning workflows

Naturefy combines BNG compliance — metric, gain plan, survey — and a 0% fee marketplace into one simple web experience. No spreadsheet wrangling, and no middleman fees when buying or selling units.

Use it to submit to your Local Planning Authority, understand if you can deliver BNG on-site, or explore and claim off-site unit options directly.

BNG – common questions

What is Biodiversity Net Gain (BNG)?
Biodiversity Net Gain (BNG) is a UK requirement that most developments deliver at least a 10% measurable improvement in biodiversity compared to the pre-development state. Naturefy's tools help you calculate and plan your BNG strategy in line with the Environment Act 2021 and Defra's biodiversity metric.
Can I use Naturefy to create Biodiversity Units?
Yes. Naturefy makes it easy for Landowners to convert their land into Biodiversity Units. Using our tool, landowners and farmers can experiment to see how many units their land can create and then we'll provide you with the necessary documents for free, then walk you through the steps to create these units.
Can I do the Small Site Metric here?
Yes. If your development is under 1 hectare or 1–9 dwellings and has no priority habitats, you can map your site and Naturefy will auto-populate the Small Site Metric for you — and you can download it for planning.
How do I create the Biodiversity Gain Plan?
After you map habitats and run the calculator, open the Biodiversity Gain Plan Tool. It will pull in your habitats, unit calculations and survey results, then generate a compliant, planning-ready PDF.
Can I check priority habitats and designated sites automatically?
Yes. Use the Biodiversity Survey Tool to scan your redline and nearby area for priority habitats and designated sites. Naturefy will show sources and IDs you can reference in your planning documents.
Does Naturefy charge fees for buying or selling BNG units?
No. Naturefy charges a 0% fee on buying and selling BNG units. Advertising your available biodiversity units on our marketplace is completely free.
Can buyers and sellers communicate directly?
Yes. Naturefy allows providers to add their website and contact details directly to their listings. You can negotiate and communicate directly with the buyer or seller without having to go through us.
How do I manage a site that is already registered with Natural England?
Naturefy automatically imports sites registered with Natural England. You can claim ownership of your registered site on our platform to manage the listing, add your direct contact details, and advertise your units.
How can I find specific BNG units for my development?
Use the free interactive map on our Provider Map page. You can easily search and filter available units by price, National Character Area (NCA), Local Planning Authority (LPA), and specific Habitat Types.
Is Naturefy free?
Yes. The online tools — calculator, gain plan, survey, and marketplace — are free to use.

Ready to Start Your BNG Journey?

Need help with a specific site?

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