Habitats issues at appeal: nutrient and recreational impacts

Where an appeal scheme could affect a European site, the inspector determining it becomes the competent authority under the Conservation of Habitats and Species Regulations 2017. That single procedural fact drives everything else. An inspector cannot allow the appeal unless satisfied, beyond reasonable scientific doubt, that the development will not adversely affect the integrity of the site. Not satisfied that it probably will not. Satisfied that it will not.

Which means the appellant has to put the inspector in a position to reach that conclusion, with mitigation already secured, before the decision is written.

The assessment the decision maker must carry out

The sequence in regulation 63 runs in a fixed order and inspectors follow it explicitly in their decisions.

1. Is the plan or project likely to have a significant effect on a European site, either alone or in combination with other plans or projects. This is the screening stage.
2. If so, carry out an appropriate assessment of the implications for the site in view of its conservation objectives.
3. Consult the appropriate nature conservation body, which in England is Natural England, and have regard to its representations.
4. Agree to the project only after establishing that it will not adversely affect the integrity of the site.
5. If that cannot be established, regulation 64 allows the project only where there are no alternative solutions, there are imperative reasons of overriding public interest, and compensatory measures are secured.

Step five is not a practical route for a housing appeal. Treat it as unavailable and concentrate on step four.

The screening stage has a trap. The Court of Justice held in People Over Wind that mitigation measures must not be taken into account when deciding whether an appropriate assessment is required, so screening is carried out on the unmitigated scheme. Domestic courts now have scope to depart from retained case law in certain circumstances, so check the current position, but the orthodox approach remains to screen without mitigation and then rely on it at the assessment stage.

Who acts as competent authority on appeal

The local planning authority is the competent authority while the application is with it. Once an appeal is lodged, that function transfers to the Secretary of State and in practice to the inspector.

Three consequences that change how an appeal is run.

The authority's own screening or assessment is evidence rather than a decision. An inspector can reach a different conclusion on it, in either direction.

Natural England has to be consulted afresh. Its earlier response on the application is a useful indicator and not a substitute, and a Natural England position that has moved since the refusal is worth establishing early.

And the inspector cannot delegate the conclusion to a condition. A condition requiring mitigation to be agreed later does not allow the inspector to be certain now, which is why these appeals turn on obligations rather than conditions.

Mitigation that can be relied upon

For the two issues that generate most appeals, the mitigation is well established and the question is delivery.

Nutrient impacts arise where additional wastewater would add nitrogen or phosphorus to a catchment draining to a protected site. Mitigation means removing an equivalent or greater load, through land use change, a wetland, or the purchase of credits from a scheme that has already created the mitigation.

Recreational disturbance arises where new housing within a defined zone would increase visitor pressure on heathland, coast or other sensitive habitat. Mitigation usually means a per-dwelling contribution to a strategic access management and monitoring programme, sometimes with suitable alternative natural greenspace provided or funded.

What an inspector needs in both cases is the same. A calculation specific to the scheme. Confirmation that the mitigation exists or is legally committed. Evidence that Natural England accepts the methodology and the quantum. And a mechanism that binds the land.

Baseline ecology underpins the calculation, so the Preliminary Ecological Appraisal needs to be current rather than two years old. Councils expect a suitably qualified author for ecological work, and professional review is strongly advised.

Securing mitigation through an obligation

At appeal the practical instrument is a unilateral undertaking, because the local authority often has no incentive to execute an agreement for a scheme it refused.

Get the drafting right and submit it early.

• Identify the mitigation precisely, by scheme name, provider and quantum, rather than by description.
• Tie occupation to confirmation of delivery, so the obligation bites at a point the authority can check.
• Provide for a substitute provider acceptable to the authority and Natural England, in case the named scheme fails.
• Include indexation where the contribution is a sum rather than a purchased credit.
• Attach the credit reservation or purchase documentation as an annexe.

Submit the draft with the statement of case and the executed version before the inquiry or before the written representations close. An undertaking produced in the final week forces the inspector to decide whether to accept late evidence, and the authority will object.

Where the refusal reason is itself about habitats, read it closely before deciding what to secure, in the way we describe in reading a refusal notice and turning it into a plan. A refusal citing a failure to demonstrate no adverse effect is answered by evidence. A refusal citing an absence of secured mitigation is answered by the undertaking.

Timing of credits and delivery certainty

Certainty is the whole test, so the delivery programme is evidence rather than background.

Credits from a scheme where the habitat is already created and legally secured give the highest certainty. Credits from a scheme with planning permission and a construction programme give less. Credits from a scheme that exists as a proposal give very little, and an inspector asked to be certain on that basis will usually dismiss.

Reservation periods need to run past the decision. An appeal takes months, and a reservation expiring before the decision date leaves the undertaking referring to credits you no longer hold. Negotiate a reservation covering the appeal timetable with an extension right, and tell the provider it is for an appeal rather than an application.

One honest difficulty. Where mitigation requires habitat to establish before it functions, the lag between purchase and effect is real, and inspectors have taken different views on how much weight that deserves. Address it directly in the evidence rather than hoping it is not raised.

Where the precautionary approach bites

Four places, consistently.

In-combination effects, where the scheme alone is modest but the catchment position is tight. The appellant has to engage with the other committed development rather than assert that its own contribution is small.

Data age, where a calculation uses occupancy rates, flow figures or visitor survey data that has been superseded.

Methodology disputes, where the appellant has used a different approach from the one Natural England advises for the catchment. Deviating from the published methodology is possible and needs justifying in detail.

And monitoring and adaptive management, where mitigation depends on future adjustment. Certainty is harder to establish for a mechanism that assumes problems will be fixed later.

Objectors are often well organised on these issues and entitled to be heard, and what objectors can do once a planning appeal starts sets out their position.

Evidence to prepare before lodging

Assemble this before the appeal goes in, not during it.

A shadow habitats regulations assessment, screening the unmitigated scheme and then assessing it with mitigation, written so the inspector can adopt its reasoning. The nutrient budget or visitor impact calculation with the methodology version stated. Natural England's correspondence, including anything received after the refusal. The credit reservation or purchase documentation. The draft unilateral undertaking. And an in-combination section that names the other development considered and where the data came from.

Put the planning case for the scheme in the Planning Statement and keep the habitats material in its own document, because the inspector will deal with it as a separate, sequential question before reaching the planning balance at all.

If the habitats position cannot be resolved with certainty, the appeal will fail regardless of the merits. That is worth saying out loud at the point of deciding whether to appeal.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance rather than legal advice, so check the position with a qualified professional before relying on it.