Ten Percent Better: The Unlikely Market England Built Out of a Planning Rule
Photo: Lewis Clarke , CC BY-SA 2.0, via Wikimedia Commons
On a windy field edge somewhere in the Home Counties, a habitat bank is doing what habitat banks do: growing a hedge, counting species, and waiting for a developer to need it. Since February 2024, most major developments in England have had to show a 10% biodiversity net gain. The rule is simple to state and fiddly to deliver. On-site first, then off-site credits, then government-backed statutory credits as a last resort. That hierarchy has created a small, specialised market in something most people cannot see: measurable ecological improvement, packaged with legal security and a monitoring plan.
The Product Is a Paper Trail With Roots
Ask an ecologist what a biodiversity unit is and you will get a careful answer. It is a metric, not a magic bean. The statutory biodiversity metric compares the condition and distinctiveness of habitats before and after a development, then applies multipliers for things like difficulty of creation and time to maturity. A credit is essentially a promise that a piece of land will be managed to deliver a certain number of those units over 30 years.
That promise needs paperwork. A habitat bank operator needs a baseline survey, a management plan, a legal agreement with the local planning authority, and a monitoring regime. The developer needs certainty that the credits will be accepted. The planning authority needs confidence that the habitat will still be there long after the housebuilder has moved on. Small consultancies have found a niche not by owning thousands of acres but by doing the unglamorous work: surveys, plans, covenants, and the annual reports that keep everyone comfortable.
The product, in other words, is not really a field. It is a defensible record that a field is getting better in the way the rules require.
Pricing Is Local, Lumpy and Slightly Awkward
Credit prices are not published on a ticker. They vary by habitat type, scarcity, local demand, management cost and risk. A credit for a low-distinctiveness grassland in one planning authority area might be priced modestly. A credit for a priority habitat in a crowded market can run into five figures. Developers compare the cost of on-site habitat, off-site credits and statutory credits. Statutory credits set a ceiling, but they are deliberately expensive. Off-site credits trade below that ceiling, but only if the habitat is credible and the legal arrangements are watertight.
That makes pricing a negotiation rather than a catalogue. A small habitat bank with a good relationship with the local authority can charge for certainty. A landowner with a promising site but a thin management plan will struggle. The consultancies in the middle are effectively translators: they turn ecological ambition into something a planner can approve and a developer can budget for.
Trust Is the Real Asset
Local planning authorities are not buying a field. They are buying confidence. They want to know that the baseline survey was done properly, that the management plan is funded, that the legal agreement will survive a change of landownership, and that someone will actually report on the results. That is why small firms with local track records have an edge. They know the planners, the sites and the awkward questions.
The recurring revenue sits in the long tail. Selling a credit is a one-off transaction. Managing the habitat, monitoring it and reporting on it is a 30-year job. Habitat banks need patient capital. Landowners get a diversified income stream. Consultancies get retainers for monitoring and compliance. It is not a tech-style growth curve. It is closer to a property management business with more mud and fewer spreadsheets.
The Credibility Filter
The market has a built-in credibility filter: ecologists, lawyers and planning officers. Overclaiming is possible, but it is not a smart business model. If a habitat fails or a management plan looks thin, the credits become harder to sell and the operator's reputation suffers. The good operators are Conservative with a capital C about what they promise. They would rather sell fewer credits and keep the relationship.
That does not remove the risks. Habitat creation can fail. Policy can change. The statutory credit price acts as a cap. Larger players may consolidate the market. But the quiet opportunity for SMEs is in being boring and reliable: meticulous baselines, realistic management plans, and monitoring that is treated as a product rather than admin.
Regulation is often described as a cost. Biodiversity net gain shows it can also be a market-making machine. It has created a trade in land, evidence and long-term care that did not exist at scale a few years ago. Ten percent better is not a gold rush. It is a slow compounder, built on trust and paperwork. In this corner of England's planning system, that may be exactly the point.
