Biodiversity Net Gain: What Commercial Property Owners in Cambridgeshire Need to Know

If you own, manage, or develop commercial property in Cambridgeshire, Biodiversity Net Gain (BNG) is no longer a box to tick further down the line. It's a legal requirement that shapes what you can build, when you can start, and what you're responsible for afterwards. For facilities managers and property owners across Cambridge's research parks, industrial estates, and retail centres, understanding BNG now avoids costly delays and non-compliance issues later.

Here's a plain-English breakdown of what BNG means for your site, and how to get ahead of it.

What Is Biodiversity Net Gain?

Biodiversity Net Gain is a planning requirement that developments must leave biodiversity in a measurably better state than before construction began, specifically a minimum 10% net gain in habitat value. It applies under the Environment Act 2021 and became mandatory for most new developments in England, replacing the old approach where biodiversity was often an afterthought bolted onto a planning application.

For most commercial developments (new builds, extensions, and site redevelopments), a BNG assessment is now a required part of the planning process, not an optional sustainability extra.

Who Does BNG Apply To?

BNG requirements apply to the vast majority of town and country planning applications, including:

• New commercial builds and extensions
• Site redevelopments and change-of-use projects
• Industrial, logistics, and retail park developments
• Education and healthcare facility expansions

Small sites have some simplified requirements, but the core 10% net gain principle still applies. If you're planning any development that needs planning permission, it's worth assuming BNG applies until an ecologist confirms otherwise.

How Is Biodiversity Net Gain Measured?

BNG is calculated using the statutory biodiversity metric, which assigns a value to habitats based on their size, type, condition, and strategic significance. A pre-development baseline is measured, then compared against the post-development habitat value, including any on-site habitat creation, enhancement, or off-site offsetting.

This isn't a rough estimate. It requires a qualified ecologist to survey the site, apply the metric correctly, and produce documentation that will stand up to scrutiny from the local planning authority.

The Three Ways to Achieve Net Gain

1. On-site biodiversity gains: creating or enhancing habitats within the development site itself, such as native planting, wildflower areas, ponds, or hedgerows.
2. Off-site biodiversity units: where on-site gains aren't sufficient or practical, developers can purchase off-site biodiversity units from habitat banks.
3. Statutory biodiversity credits: a last-resort option, purchased from the government, typically at a higher cost, used only when on-site and off-site options are exhausted.

For most commercial sites, a combination of on-site habitat creation and careful landscape design delivers the best outcome, both for compliance and for the long-term appeal of the property.

The Part That Catches Property Owners Out: The 30-Year Commitment

This is the detail that surprises a lot of commercial property owners: BNG isn't a one-off requirement satisfied at planning stage. Habitats created or enhanced to meet BNG obligations must be maintained and monitored for a minimum of 30 years, secured through a legal agreement, either a Section 106 obligation or a conservation covenant.

That means a habitat management plan needs to be built in from the start, with realistic, fundable long-term maintenance, not just an attractive landscaping scheme designed to pass planning and then left to fend for itself. Getting this wrong doesn't just risk the habitat failing; it risks breaching a legal agreement tied to the site.

What This Means for Facilities Managers and Property Owners

If your organisation already has BNG obligations attached to a site, or is about to take one on through a new development, a few practical questions are worth asking now:

• Is there an approved habitat management and monitoring plan for the site, and who is responsible for delivering it?
• Does your grounds maintenance contractor understand BNG habitat requirements, or are they maintaining the site as standard amenity landscaping?
• Are monitoring reports being submitted on the schedule required by your Section 106 agreement or conservation covenant?
• If gains were delivered off-site, is there clarity on who holds responsibility for long-term reporting?

A generic grounds maintenance approach, regular mowing and seasonal tidying, can actually work against BNG habitats. Wildflower meadows, native hedgerows, and created ponds need specialist, habitat-appropriate management, not a standard commercial cut-and-strim schedule.

How Zion Landscapes Supports BNG Compliance

We work with commercial property owners, developers, and facilities managers across Cambridgeshire on both sides of Biodiversity Net Gain: getting developments through planning, and keeping habitats compliant for the decades that follow.

Our Biodiversity Net Gain Consultancy service covers baseline surveys, metric calculations, and habitat design that satisfies planning requirements without compromising how a site looks and functions. Our Ecology Consultancy team supports the survey and reporting side, and our Grounds Maintenance teams then deliver the ongoing, habitat-specific management that keeps sites compliant across that 30-year window, not just attractive on planning submission day.

If you've got a development going through planning, or an existing BNG obligation you've inherited with a site, it's worth getting a specialist view before it becomes a compliance problem.

Get in touch with our team to talk through your site.