Local Nature Recovery Strategies and strategic significance

A local nature recovery strategy planning question usually arrives as an arithmetic problem. The same habitat, created to the same condition, on two sites a mile apart, produces different numbers of biodiversity units. The reason is the strategic significance multiplier inside the statutory metric, and what drives that multiplier is whether the location appears on the relevant strategy's local habitat map.

That is an unusual mechanism. A document that is not part of the development plan, not examined and not subject to any appeal, feeds directly into a calculation that determines whether a scheme meets a statutory requirement.

What a strategy contains

The Environment Act 2021 requires a Local Nature Recovery Strategy for each area of England, prepared by a responsible authority appointed by government. In practice that authority is usually a county council, a unitary authority or a combined authority, and it prepares the strategy with the district authorities, Natural England and local partners.

Each strategy has two components.

A statement of biodiversity priorities, describing the area's habitats and species, the pressures on them and the priorities for recovery.

A local habitat map, showing areas of particular importance for biodiversity and areas that could become of particular importance if habitat were created or improved there. The second category is what makes the map useful to development, because it identifies where new habitat is wanted rather than only where existing habitat sits.

How the map reaches the metric

The statutory biodiversity metric applies a strategic significance factor to each habitat parcel, both in the baseline and in the post-development position.

The multiplier is modest per parcel and it compounds across a site. On a scheme where the gain is finely balanced, reading the habitat map correctly can be the difference between meeting the ten per cent requirement on site and having to buy units.

It cuts both ways. A baseline habitat sitting in a priority area is worth more at the outset, so losing it costs more. Ecologists who apply the high multiplier to the proposed habitats and the low one to the baseline produce a flattering answer that will not survive checking, and it is among the errors councils find in the metric.

Reading the habitat map for a site

Three practical points.

First, the map is spatial and the priorities are thematic, so both have to be read together. A parcel may sit inside a mapped area whose priority is species-rich grassland, and creating a pond there does not automatically attract the uplift. The habitat created has to match what the strategy wants in that place.

Second, the mapping resolution varies. Some strategies map at a fine grain, others show broad opportunity zones. Where a boundary is ambiguous, record the interpretation taken and the evidence for it in the assessment rather than leaving it implicit.

Third, check the publication status. Strategies were prepared on different timetables across the country, and some areas were consulting while others had published. A draft strategy is not nothing, and it is not the same as a published one. Say which version was used and give its date.

A Preliminary Ecological Appraisal done early should record the strategy position alongside the habitat survey, because it affects the layout decisions that follow.

Effect on off-site gain and unit purchasing

For anyone buying units, the habitat map changes the comparison.

Two providers offering grassland creation at similar prices are not offering the same product if one sits inside a mapped priority area and the other does not. The first generates more units per hectare through the multiplier. Comparing headline prices without checking the location is how schemes end up short.

The same logic applies to a developer choosing between parcels of their own land for off-site delivery. Where a landholding spans a mapped boundary, putting the habitat creation on the right side of it produces more units for the same expenditure.

Delivery risk still matters more than either. Units only count if the habitat establishes and is maintained for thirty years, so the questions around planting seasons and habitat establishment and around receptor site selection come before the multiplier arithmetic.

What weight a strategy carries in decisions

This is where practitioners overreach.

A strategy is not a development plan document. It was not examined, it carries no statutory presumption, and it cannot be cited as though it were policy. Its weight comes from three places. The strengthened biodiversity duty on public authorities requires them to have regard to relevant strategies. National policy directs decision makers towards networks for nature recovery. And local plans increasingly reference the strategy directly, which gives it a route into the development plan through the policy that cites it.

So the honest framing in a planning statement is that the strategy is a material consideration, identified in the relevant local plan policy where that is true, and that the scheme responds to it. Overstating it invites a correction in the officer report, which is a poor way to spend credibility.

The metric position is different again and is not discretionary. A Biodiversity Net Gain Assessment has to apply the strategic significance factors the metric requires, and the statutory metric must be completed by a competent person under the Environment Act 2021 regime, with the biodiversity gain plan approved by the local planning authority before development begins.

There is a wider use for the map that has nothing to do with the metric. A strategy states what the area is trying to achieve for nature, in terms an officer and a planning committee can follow. A scheme whose landscape proposals happen to align with those priorities has an argument worth making in plain words, quite apart from the unit arithmetic. Hedgerow connectivity, wet grassland, chalk stream buffers, whatever the local priority happens to be. That is the kind of point that reads well in a committee report.

Keeping up with adoption

Strategies are living documents and are expected to be reviewed and republished. A scheme designed against one version and determined against another can find its unit total has moved.

Record the version, the date and the map extract used in the assessment. Where a review is under way and likely to conclude before determination, say so and indicate what would change. Authorities are far more comfortable with an assessment that names its own sensitivity than with one that presents a single number as settled.

For specialist technical reports, qualified professional input may be required. This is general guidance rather than legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.