Habitats Regulations Assessment: screening and the next stage
The council is the competent authority, not you. What a shadow habitats regulations assessment has to contain, and why mitigation cannot be used to screen a project out.
A habitats regulations assessment planning duty sits with the council, not the applicant. Under the Conservation of Habitats and Species Regulations 2017, the local planning authority is the competent authority, and it cannot grant permission for a project likely to affect a protected site until it has carried out the assessment itself. Applicants routinely prepare a shadow assessment so the council has something to adopt. That shadow document is evidence, not the decision.
Get the sequence wrong and the permission is vulnerable. The assessment has to happen before consent is granted, and it cannot be deferred to a condition.
What triggers the duty
Regulation 63 applies where a plan or project is not directly connected with the management of a protected site and is likely to have a significant effect on it, alone or in combination with other plans or projects. That is the statutory trigger, usually shortened to LSE.
The sites in question are Special Areas of Conservation and Special Protection Areas, which since the 2019 EU exit amendments form the national site network. Ramsar sites are not caught by the Regulations but national policy applies the same approach to them, so in practice they are handled identically.
Distance is not the test. Air quality effects from traffic on a heathland SAC can arise from a scheme several kilometres away, recreational pressure from housing is assessed across a zone of influence that may extend to 15 kilometres for some coastal SPAs, and nutrient loading travels down a catchment. What matters is a plausible pathway from the development to a qualifying feature.
Screening for likely effects
Screening is deliberately precautionary. The threshold is low: if effects cannot be excluded on the basis of objective information, screening fails and the project proceeds to appropriate assessment. Uncertainty pushes you forward rather than letting you stop.
The single most common error is taking mitigation into account at this stage. Following the Court of Justice ruling in People Over Wind and Sweetman, measures intended to avoid or reduce harmful effects on a protected site cannot be used to screen a project out. A scheme that only avoids an effect because it includes a buffer planting strip has to go to appropriate assessment, where the buffer is then examined properly.
There is a real distinction between mitigation and design. A development that simply does not touch the pathway, because there is no hydrological connection and no traffic route through the site, is screened out on the facts. A development that would touch the pathway but for a proposed measure is not.
Write the screening matrix by qualifying feature rather than by site. A SPA designated for overwintering waders and a SAC designated for dry heath respond to entirely different pressures, and a matrix that lists the site name once produces conclusions nobody can check.
In combination effects
The in combination stage defeats more applications than the alone stage. It asks what the project adds to the effects of other plans and projects that are already consented, allocated or under consideration.
Assembling that list is laborious. It means the adopted local plan allocations, extant permissions not yet built out, applications under determination, and any relevant strategic infrastructure. Councils with a catchment-scale issue often maintain a register, and where they do not, the applicant has to build one and say what cut-off date was used.
Small schemes are not exempt. The Dutch nitrogen litigation established that a programme of individually minor effects cannot be waved through on the basis that each one is trivial, which is precisely why a four-dwelling scheme in a nutrient catchment still needs the arithmetic. An ecological appraisal that stops at the red line will not support this stage.
The appropriate assessment
Appropriate assessment is the authority's judgement on whether the project will adversely affect the integrity of the protected site, made in light of the site's conservation objectives. The standard is high. The authority may agree to the project only where it has concluded there is no reasonable scientific doubt about the absence of adverse effects.
Integrity is about the site's structure and function and its capacity to sustain the features for which it was designated. A loss of 0.2 hectares of a 900 hectare SAC may or may not affect integrity depending on where it sits and what it supports, and the assessment has to reason that through rather than present a percentage.
What the document needs is narrow and specific:
- The qualifying features and the conservation objectives taken from the published site documents.
- The pathways carried forward from screening, each one traced from source to receptor.
- The evidence relied on, including survey data, modelling and monitoring, with its limitations stated.
- The measures proposed, their delivery mechanism and their timing relative to occupation.
- The conclusion on integrity for each feature, not a single conclusion for the site.
Where survey data for protected species overlaps with the assessment, the field work has to come from a suitably licensed ecologist under the Wildlife and Countryside Act 1981 and the 2017 Regulations, and a Protected Species Survey prepared by anyone else will not carry the assessment.
Natural England as consultee
Regulation 63(3) requires the competent authority to consult the appropriate nature conservation body, which in England is Natural England, and to have regard to any representations it makes. Councils take that seriously, and an appropriate assessment that Natural England has not agreed is a difficult foundation for a grant of permission.
Engage before submission. Natural England publishes standing advice and catchment-specific guidance on several recurring issues, and its discretionary advice service can review a draft assessment. Where a strategic solution exists, such as a mitigation scheme for recreational pressure or a nutrient credit scheme, using it is usually faster than building a bespoke case.
The consultee cannot make the decision. But an objection that is not answered on the evidence tends to end the application.
Mitigation and its limits
Measures relied on at appropriate assessment have to be certain, enforceable and in place when the effect arises. That normally means a section 106 obligation rather than a condition, because most of the measures are off-site, long-term or both.
Three limits catch people out. Measures that depend on a third party's future decision are not certain. Measures with no funded management beyond the build period do not last as long as the effect. And measures whose effectiveness is itself uncertain, such as untested habitat creation for a specialist feature, cannot support a no-adverse-effect conclusion.
If integrity cannot be protected, the only route left is the derogation in regulation 64: no alternative solutions, imperative reasons of overriding public interest, and compensatory measures secured to protect the coherence of the network. For a private housing scheme this is a remote prospect, and it is better to redesign than to argue it. Habitat works offered as compensation here are a different thing from biodiversity net gain under the Environment Act 2021, and conflating the two in a single document confuses everybody.
Recording it in the decision
The assessment has to be the authority's own and it has to be documented. In practice that means the officer report adopts the shadow assessment expressly, states the conclusion on integrity by feature, and records the Natural England response and how it was addressed. A report that simply attaches the applicant's document without adopting it leaves an obvious ground for challenge.
Where an Environmental Statement is also required, keep the two assessments separate. They have different tests and different thresholds, and merging them into a single chapter of an Environmental Impact Assessment tends to import the wrong standard of proof into the habitats work.
This is general guidance, not 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.
Enter your postcode on PlanScope to see which ecological reports a site near a protected area is likely to need.
Frequently asked questions
Who carries out a habitats regulations assessment?
The competent authority does, which for a planning application is the local planning authority. Applicants normally prepare a shadow assessment so the council has evidence to work from, but the council has to adopt it and reach its own conclusion. An officer report that attaches the applicant's document without adopting it leaves the permission open to challenge.
Can mitigation be used to screen a project out?
No. Following the Court of Justice ruling in People Over Wind and Sweetman, measures intended to avoid or reduce harmful effects on a protected site cannot be taken into account at the screening stage. A scheme that only avoids an effect because of a proposed buffer or contribution must proceed to appropriate assessment, where the measure is examined on the evidence.
Which sites are covered by the 2017 Regulations?
Special Areas of Conservation and Special Protection Areas, which together form the national site network following the 2019 EU exit amendments. Ramsar sites are not caught by the Regulations themselves, but national planning policy applies the same approach to them, so councils assess them in the same way in practice.
How far from a protected site does the duty apply?
There is no fixed distance. The test is whether a plausible pathway runs from the development to a qualifying feature. Air quality effects can arise several kilometres away, recreational pressure is assessed across zones of influence that reach well beyond a site boundary, and nutrient loading travels down a whole catchment.
What happens if adverse effects on integrity cannot be ruled out?
The only route left is the derogation in regulation 64, which requires that there are no alternative solutions, that there are imperative reasons of overriding public interest, and that compensatory measures are secured to protect the coherence of the national site network. For most private development this is a remote prospect and redesign is the better answer.
Is biodiversity net gain the same thing as habitats compensation?
No. Biodiversity net gain under the Environment Act 2021 is a separate statutory regime with its own metric and gain plan. Compensatory measures under regulation 64 exist to protect the coherence of the national site network. Presenting the two in one document tends to confuse the tests and weakens both cases.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.