Which designations trigger an EIA screening opinion

A designation does not require an Environmental Impact Assessment. What it does is remove the size thresholds that would otherwise keep a project out of the regime, which is why a 30-dwelling scheme that would never be screened in open countryside has to be screened if part of it falls inside a National Park. That is the whole mechanism behind the designation eia screening trigger, and it rests on a single defined term in the Town and Country Planning (Environmental Impact Assessment) Regulations 2017: sensitive area.

The nuance that matters is this. A sensitive area removes the threshold, not the requirement that the project be of a type listed in Schedule 2. A development that does not fall within any Schedule 2 description is outside the regime however sensitive its location.

What counts as a sensitive area

The definition sits in regulation 2(1) and is a closed list. It covers land notified as a Site of Special Scientific Interest under section 28 of the Wildlife and Countryside Act 1981, a National Park, the Broads, a World Heritage site, a scheduled monument, an area of outstanding natural beauty now known as a National Landscape, and a European site within the meaning of the Habitats Regulations.

Read the list in the Regulations rather than from memory, because the wording is precise and the consequence of mistaking it is severe.

Equally important is what is absent. Conservation areas are not sensitive areas. Nor are listed buildings, the Green Belt, ancient woodland, Local Wildlife Sites, local nature reserves, registered parks and gardens, Tree Preservation Orders, Air Quality Management Areas or flood zones. Those designations all carry planning consequences and may generate specialist reports, and none of them removes a Schedule 2 threshold.

The test is also about location rather than effect. The question is whether any part of the development is to be carried out in a sensitive area, which means a site touching the boundary of an SSSI by a metre is caught, while a site 50 metres from it that will plainly affect it is not caught by this route. Boundary precision therefore matters, and the approach in our note on reading an SSSI citation and the notified features is the right starting point.

How the threshold disappears

Schedule 2 is a table. Column 1 describes the type of development, for example urban development projects, industrial estate development, or installations for the disposal of waste. Column 2 gives the applicable thresholds and criteria, usually a floorspace or site area figure.

Development falls within Schedule 2 if it is of a column 1 description and either any part of it is in a sensitive area, or it meets the column 2 threshold. So the two routes are alternatives. Inside a sensitive area the column 2 figure becomes irrelevant, and any project of the listed description, however small, is Schedule 2 development that must be screened.

That does not mean EIA follows. Screening is a judgement about whether the development is likely to have significant effects on the environment, made against the selection criteria in Schedule 3. A small scheme in a National Landscape is very often screened out, with reasons. The obligation is to carry out the screening and record it, not to reach a particular answer.

Schedule 1 development is separate and absolute. Those projects require EIA regardless of location or threshold, and no screening judgement is available.

Asking for a screening opinion

You can request a screening opinion from the local planning authority before submitting an application, and on most sensitive-area schemes you should.

The request needs a plan sufficient to identify the land, a description of the nature and purpose of the development, a description of its possible effects on the environment, and any other information you wish to provide. In practice a useful request runs to a short report: the site and its designations with a constraints plan, the development described with figures, the Schedule 2 category identified, and a reasoned assessment against the Schedule 3 criteria showing why the environmental effects fall below that test.

The authority has three weeks to respond, extendable by written agreement, and its opinion must be in writing with reasons. Where it fails to respond, or where you disagree with an opinion that the development is EIA development, you can ask the Secretary of State for a screening direction, which overrides the local opinion. That route takes time, so factor it into the programme rather than discovering it late.

If you submit an application for Schedule 2 development without a screening opinion, the authority must adopt one itself, and it will do so without your reasoning in front of it.

Cumulative development and the salami problem

Schedule 3 requires the cumulation of the proposal with other existing or approved development to be taken into account. That has two practical consequences.

The first is that a modest scheme adjoining a larger consented one may be screened differently from the same scheme in isolation. Identify the neighbouring consents in the screening request rather than leaving the authority to find them.

The second is the risk of dividing a project to stay under a threshold, which does not work in a sensitive area because there is no threshold to stay under, and does not work elsewhere either where the parts are properly one project. An authority or an objector can treat successive applications on adjoining land in common control as a single development for screening purposes. The honest approach is to screen the whole of what you intend to build.

Where a European site is involved, screening under the EIA Regulations runs alongside but separately from assessment under the Habitats Regulations, and the two ask different questions. The qualifying features matter for the second, as our note on Special Protection Area citations and qualifying features explains.

Getting it wrong

A permission granted for EIA development without an Environmental Statement is vulnerable. Judicial review of a planning decision must be brought promptly and in any event within six weeks, and a successful challenge quashes the permission rather than merely criticising the process.

The practical risks run wider than litigation. A lender's solicitor will ask for the screening opinion on any site with a designation, and its absence is a diligence problem on refinancing or sale. A development begun on a flawed permission has no secure consent. And retrofitting an Environmental Statement after a challenge means a fresh application, a fresh determination period of 16 weeks for EIA development, and a scoping and consultation exercise that could have been done at the start for a fraction of the cost.

Where EIA is required, the Environmental Impact Assessment process demands an Environmental Statement prepared by competent experts under the 2017 Regulations. That is a legal requirement, so an AI-assisted draft is a starting point for those experts and never a substitute for their work.

A workable sequence

Four steps, in order.

Establish the designations from the authoritative datasets rather than from a local plan map: the designated site layers, the heritage list and the relevant national mapping. Confirm whether any part of the red line falls inside a sensitive area, with a plan showing the overlap or the gap in metres. Identify whether the project falls within a Schedule 2 description regardless of size. Then, if both conditions are met, request a screening opinion with a reasoned Schedule 3 assessment attached.

Where the result is a screening opinion that EIA is not required, keep it with the application and reference it in the planning statement. Where the scheme later changes materially, go back and ask again, because a negative opinion is given on the scheme described in the request. A list of the other reports a designated site typically needs is worth checking against the full set of report types at the same time.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. Enter your postcode on PlanScope to see which reports your site is likely to need.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.