Screening opinion: when a scheme needs an EIA
A screening opinion decides whether a proposal needs an Environmental Statement. It is free, takes three weeks and settles the largest unknown in a major application budget.
A screening opinion is the local planning authority's formal determination of whether a proposal is EIA development, meaning it cannot be granted permission until an Environmental Statement has been submitted and taken into account. It is made under the Town and Country Planning (Environmental Impact Assessment) Regulations 2017. For anyone scoping a 150-unit scheme or a six-hectare urban extension, this is the decision that sets the evidence budget, because a positive opinion brings a 16-week determination period, a longer publicity period and a coordinated suite of technical work that has to be pulled together by competent experts.
Get the screening opinion early. It is free, it takes three weeks, and it converts the biggest single uncertainty in a major application programme into a written answer you can plan around.
Schedule 1 and Schedule 2 development
The Regulations split development into two lists. Schedule 1 development always requires EIA. The list is short and industrial: crude oil refineries, large thermal power stations, nuclear installations, certain hazardous waste incinerators, motorways and express roads, airports with a runway of 2,100 metres or more. Most residential and commercial promoters will never touch it.
Schedule 2 is where the arguments happen. A proposal falls within Schedule 2 if it belongs to one of the listed descriptions and either exceeds the threshold in column 2 or sits in a sensitive area. Being within Schedule 2 does not mean EIA is required. It means the authority has to decide whether the development is likely to have effects on the environment that count as significant, judged by factors such as its nature, size or location.
The category that catches most developers is 10(b), urban development projects.
| Schedule 2 category 10(b) trigger | Threshold in column 2 |
|---|---|
| Non-dwellinghouse urban development | Development area of more than 1 hectare |
| Residential development | More than 150 dwellings |
| Any urban development project | Overall site area of more than 5 hectares |
A sensitive area removes the thresholds altogether. The Regulations define these as sites of special scientific interest, National Parks, the Broads, National Landscapes (still drafted as areas of outstanding natural beauty), World Heritage Sites, scheduled monuments and European sites. A modest scheme inside any of those can be Schedule 2 development on a fraction of a hectare, which is why a constraints check belongs at the front of the process rather than after the layout is fixed. Where a European site is engaged, screening under the Habitats Regulations runs separately and to a different test, and the two are often confused. Our note on habitats regulations assessment sets out where the two regimes diverge.
Requesting an opinion and what to send
A request is made in writing to the authority before an application is submitted. Regulation 6 sets out the minimum content, and authorities do refuse to start the clock on incomplete requests.
- A plan sufficient to identify the land.
- A description of the development, covering its physical characteristics, its location and the whole of the site, not just the built area.
- A description of the aspects of the environment likely to be significantly affected.
- Optionally, a description of any features of the proposal or measures envisaged to avoid or prevent what would otherwise have been significant adverse effects.
There is no fee. Keep the request to a short covering letter, a location plan, an indicative layout or parameter plan and a constraints plan. Overloading it with draft technical chapters invites the authority to find effects you have not yet assessed.
Be honest about the red line. Screening looks at the project as a whole, and splitting a site into phases to duck a threshold is the most common way a negative opinion gets unpicked later. If the scheme is the first phase of something larger, say so and explain how cumulative effects have been considered.
The selection criteria the authority applies
Schedule 3 sets out the criteria the authority must take into account. They fall into three groups, and a well-argued request addresses each in a paragraph or two rather than asserting that effects will be modest.
Characteristics of the development covers size and design, cumulation with other existing or approved development, use of natural resources including land, soil, water and biodiversity, waste production, pollution and nuisances, risk of major accidents and risks to human health. Location of the development covers the existing and approved land use, the abundance and quality of natural resources in the area, and the absorption capacity of the natural environment, with particular attention to wetlands, coastal zones, densely populated areas and landscapes of historic or cultural significance. The third group is the type and characteristics of the potential impact, judged by magnitude, geographical extent, intensity, duration, frequency, reversibility and the possibility of reducing the impact effectively.
Significance is a matter of judgement, and inspectors have consistently treated it as one. Two sites of the same size can screen differently because one drains to a designated watercourse and the other does not.
Mitigation offered at screening and its limits
The 2017 Regulations expressly allow a request to describe measures that would avoid or prevent those adverse effects, and authorities may take those into account. The limit is that the mitigation has to be certain, straightforward and capable of being secured. A bund, a relocated access or a retained hedgerow with a defined buffer is the sort of measure that screens out an effect. A promise to agree a construction environmental management plan with the council at some later date is not, because the effect is still uncertain at the point of the decision.
Where there is genuine doubt about whether mitigation will work, the precautionary position favours a positive opinion. That is not a disaster. An Environmental Statement scoped tightly around three or four topics costs less and moves faster than a negative opinion that is challenged eight months later.
Worked illustration, and this is illustrative only: a 180-dwelling scheme on former arable land 400 metres from a site of special scientific interest is Schedule 2 development on the dwelling count alone. If the request shows a 30-metre buffer, no surface water discharge towards the designation and a habitat mitigation package, the authority may reasonably conclude there is no likely effect of that order. If the drainage strategy is undecided, the honest answer is that the effect cannot yet be ruled out.
Timescales and the effect of a positive opinion
The authority must adopt and send its opinion within three weeks of the request, or a longer period agreed in writing. If it does not, the applicant can ask the Secretary of State for a screening direction, which overrides the authority's position. The same route is available if you disagree with a positive opinion, though a direction takes considerably longer than three weeks and a promoter with a board deadline rarely waits for one.
A positive opinion changes the application in four ways. The application must be accompanied by an Environmental Statement prepared by competent experts. The statutory determination period becomes 16 weeks. Publicity requirements lengthen, and the authority must consult the statutory consultees on the Statement. And the decision notice must record that the environmental information has been taken into account.
An authority also has to screen at the point of validation if an application arrives without a Statement and it considers the proposal may be EIA development. Discovering that at week two of an eight-week minor application is an expensive way to find out.
Reasons must be given either way. A negative opinion has to explain, by reference to the Schedule 3 criteria, why effects of that order are not likely. Thin reasoning is the weakness most often exposed in a legal challenge by a third party, so it is worth reading the opinion carefully when it arrives rather than filing it.
Revisiting an opinion
A screening opinion attaches to the proposal described in the request. Material change to the red line, the unit count, the access arrangements or the phasing can take the scheme outside it, and a fresh request costs less than arguing the point at committee. Authorities can and do adopt a second opinion where the facts have moved.
Third parties cannot appeal a screening opinion, but they can apply for judicial review of the decision that relies on it, usually on the ground that the reasons do not engage with the Schedule 3 criteria or that mitigation was treated as certain when it was not. Where an authority fails to determine the application at all, the route is the deemed refusal appeal, and screening status travels with the appeal. Central government intervention in an application, including a holding direction, is a separate matter and does not reopen screening by itself.
An Environmental Impact Assessment must be prepared by competent experts under the 2017 Regulations, so treat any AI-assisted draft as a structured starting point for that team rather than a substitute for it. This is general guidance, not legal advice, and the position should be checked with your local planning authority or a qualified professional before you rely on it.
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Frequently asked questions
How long does a screening opinion take?
The local planning authority must adopt and send its opinion within three weeks of receiving a valid request, or within a longer period agreed with you in writing. If it misses that deadline you can ask the Secretary of State for a screening direction instead. A direction takes longer, so most promoters chase the authority first and agree a short extension if the case officer asks for one.
Is there a fee for requesting a screening opinion?
No. A request under regulation 6 of the 2017 Regulations carries no application fee, which is why it is worth doing before the layout is fixed. The cost is the time spent preparing the location plan, the description of the development and the short assessment of the aspects of the environment likely to be affected.
Does being in Schedule 2 mean I need an EIA?
No. Schedule 2 only means the proposal is capable of requiring assessment. The authority must then judge whether the development is likely to have significant effects on the environment, applying the Schedule 3 selection criteria. Many Schedule 2 schemes receive a negative opinion because the effects, while real, are not significant in EIA terms.
Can mitigation be taken into account at screening?
Yes, the Regulations allow a request to describe features or measures that would avoid or prevent adverse effects of that order. The measure has to be certain and capable of being secured rather than a promise to agree something later. Where there is real doubt about whether it will work, the cautious answer is a positive opinion and a tightly scoped Environmental Statement.
What happens to the timetable after a positive screening opinion?
The statutory determination period becomes 16 weeks rather than 13 for a major application, publicity requirements lengthen, and the application cannot be validated without an Environmental Statement prepared by competent experts. Consultation with statutory consultees on the Statement is also required, so the realistic programme extends well beyond the formal period.
Can a screening opinion be challenged?
There is no appeal against a screening opinion itself. An applicant unhappy with a positive opinion can request a screening direction from the Secretary of State. Third parties usually challenge the eventual planning decision by judicial review, arguing that the reasons failed to engage with the Schedule 3 criteria or that uncertain mitigation was treated as certain.
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.