Schedule 1 against Schedule 2 EIA development

Schedule 1 development always needs an Environmental Impact Assessment. Schedule 2 development needs one only where the local planning authority, or the Secretary of State, decides it is likely to have effects on the environment of a scale that requires assessment. That is the whole of the schedule 1 vs schedule 2 EIA distinction, and everything else follows from it: the thresholds, the selection criteria, the screening request and the consequences of putting a project in the wrong box.

Schedule 1 is a short list of large projects. Schedule 2 is a much longer list with thresholds in a second column, and it is where almost every contested screening argument happens.

Mandatory assessment against a case by case test

The Schedule 1 list in the EIA Regulations 2017 covers projects whose effects are presumed, by their nature and scale, to require assessment. Crude oil refineries, thermal power stations of 300 megawatts or more, nuclear installations, integrated chemical works, motorways and express roads, long-distance railway lines, airports with a runway of 2,100 metres or more, major waste disposal installations, large dams and reservoirs, long large-diameter pipelines, quarries and open-cast mining over 25 hectares, peat extraction over 150 hectares, wastewater treatment plants serving 150,000 population equivalent, and intensive livestock units above stated bird and pig numbers.

Those figures are thresholds of definition rather than screening thresholds. Meet them and the project is EIA development. There is no discretion and no screening judgement to make.

Schedule 2 works differently. The schedule pairs a description of development with an applicable threshold or criterion, and development meeting the description and exceeding the threshold is Schedule 2 development that must be screened. Screening then asks whether the development is likely to have significant effects on the environment.

Thresholds and how they are applied

The Schedule 2 thresholds do not decide whether assessment is required. They decide whether the screening duty arises at all.

For urban development projects, the applicable thresholds are more than one hectare of urban development that is not dwellinghouse development, more than 150 dwellings, or an overall development area of more than five hectares. Industrial estate development has its own area threshold. Each of the other categories, from agriculture and aquaculture through extractive industry, energy, infrastructure and tourism, carries its own.

There is one important override. Where the development is in a sensitive area, the thresholds fall away and any development within the Schedule 2 description must be screened however small it is. Sensitive areas include sites of special scientific interest, National Parks, National Landscapes, World Heritage Sites, scheduled monuments and European sites.

The selection criteria that decide screening

Schedule 3 sets out what the authority must take into account: the characteristics of the development, its location, and the type and characteristics of the potential impact.

Characteristics of development covers size and design, cumulation with other development, use of natural resources, waste production, pollution and nuisances, risk of major accidents and risks to human health. Location covers the existing and approved land use, the abundance and regenerative capacity of natural resources, and the absorption capacity of the natural environment, with particular attention to wetlands, coastal zones, mountain and forest areas, nature reserves, densely populated areas and landscapes of historical importance.

Impact characteristics cover the magnitude and spatial extent of effects, their nature, their transboundary character, their intensity and complexity, their probability, and their expected onset, duration, frequency and reversibility.

Write the screening request against those headings. An officer working through Schedule 3 with your document open in the same order is far more likely to reach a negative opinion than one hunting for the relevant facts.

Cumulative effects and other development

Cumulation is where screening decisions most often come apart. The assessment has to consider the project together with other existing and approved development, and applicants routinely assess their scheme in isolation.

Identify the committed schemes yourself and list them: consented but unbuilt applications nearby, allocations with resolutions to grant, and any live application likely to be determined first. Then say why the combined effect does or does not change the answer.

Splitting a project to keep each part below a threshold does not work. Where the phases are functionally connected, the authority is entitled to screen the project as a whole, and a permission obtained by presenting a fragment of a larger scheme is vulnerable. A similar logic applies to the staged approach to ground investigation described in the note on contamination Phase 1 or Phase 2, where the trigger for the next stage depends on what the first one found.

Sensitive areas and lowered thresholds

The sensitive area rule catches small schemes. A modest development inside a National Park, or a small extraction operation adjoining a site of special scientific interest, can be Schedule 2 development requiring screening when the same proposal elsewhere would not be.

That does not mean an environmental statement follows. Most such screenings end negative, because a small scheme in a sensitive area often has no effect of the scale that triggers assessment. It does mean the screening step has to happen and be documented, and that the validation officer will look for it.

Where a scheme sits near rather than within a sensitive area, the threshold applies as normal but the location feeds into the Schedule 3 judgement. Proximity to a designated site is a location factor, not a trigger.

An illustrative case. A minerals operator proposes a two hectare sand extraction on land immediately adjoining a river site of special scientific interest. Two hectares would be well under the ordinary threshold, but the sensitive area rule means the proposal has to be screened, and the hydrological connection to the river is the factor the officer weighs. The scheme and the figures are illustrative rather than drawn from a real application.

Consequences of getting the category wrong

Granting permission for EIA development without an environmental statement leaves the permission open to challenge, and the courts have quashed permissions on that basis. That risk sits with the developer as much as the authority, because the quashed permission is yours.

The reverse error costs money rather than validity. Preparing an environmental statement for a project that never needed one adds cost and months to a programme, and the chapters rarely persuade anyone of anything the supporting documents would not have covered.

So screen deliberately. Ask for a formal opinion where the answer is arguable, keep the request proportionate where it is not, and record the reasoning either way. Where the answer is positive, remember that an Environmental Impact Assessment must be prepared by competent experts under the 2017 Regulations, and that an AI-assisted draft is a starting point for those experts rather than a replacement for them. Browse the full list of report types to see how the technical chapters map onto individual supporting documents, or enter your postcode on PlanScope to check what a site is likely to need.

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.