Determination periods for EIA development and 16 weeks

An application accompanied by an Environmental Statement has a statutory determination period of 16 weeks, not the eight weeks for a minor application or the 13 weeks for a major. That period is set by article 34 of the Town and Country Planning (Development Management Procedure) (England) Order 2015, and it runs from the date the application is valid. For anyone programming a major scheme, the 16 weeks is the least interesting number in the sequence, because the publicity requirements, a regulation 25 request and the section 106 all sit inside or beyond it.

Treat 16 weeks as the earliest theoretical decision date and the extension of time as the real one.

Which applications attract the longer period

The 16 week period applies where the application is accompanied by an Environmental Statement under the Town and Country Planning (Environmental Impact Assessment) Regulations 2017. It is the presence of the statement that triggers it, not the size of the scheme.

Three routes lead there. A Schedule 1 project requires environmental impact assessment in every case. A Schedule 2 project exceeding the applicable threshold or sitting in a sensitive area requires screening, and the authority's screening opinion may conclude that significant environmental effects are likely. Or the applicant volunteers an Environmental Statement without a positive screening opinion, which happens where the risk of challenge is high.

If you are not yet sure which category a scheme falls into, the screening request is the step that resolves it, and how to request an EIA screening opinion sets out the information to supply. An Environmental Impact Assessment must be prepared by competent experts under the 2017 Regulations, so an AI-assisted draft is a starting point for that team rather than a substitute. Qualified professional input is legally required here.

When the period starts and what stops it starting

The clock starts on the date the authority receives a valid application. Valid means the correct form, the ownership certificate, the fee, the national information requirements and the items on the authority's local list, together with the Environmental Statement itself.

Validation failures on EIA schemes have a particular flavour. The statement is submitted as a main volume plus technical appendices plus a non-technical summary, and the non-technical summary is a statutory requirement rather than a courtesy. Figures that are illegible at the size they are printed, appendices referenced but not supplied, and a mismatch between the description of development on the form and the project assessed in the statement are the three that most often send a submission back.

That last one matters more than it looks. The Environmental Statement assesses a defined project, and if the description on the form is wider or narrower, the assessment does not cover what is being applied for. Fixing it later means amending the description of development with fresh publicity.

Consultation on the environmental statement

The 2017 Regulations set a minimum period of 30 days for representations on an application accompanied by an Environmental Statement, which is longer than the 21 days that applies to ordinary applications. The authority must publicise the application, make the statement available for inspection, and consult the bodies with environmental responsibilities.

The consultation bodies on a typical major scheme include the Environment Agency, Natural England and Historic England, together with the lead local flood authority, the local highway authority or National Highways, the sewerage undertaker and, where relevant, the Health and Safety Executive. Each has its own internal timetable, and a holding objection from any of them will stop a recommendation going forward. Working the objection out before the committee report is drafted is the only reliable approach, and clearing a statutory consultee holding objection looks at how that is done.

Regulation 25 requests and what they do to the programme

Where the authority considers the Environmental Statement incomplete, regulation 25 of the 2017 Regulations lets it require further information. This is the single most common cause of an EIA timetable slipping.

The time taken to produce the information is only part of the consequence. Further information supplied under regulation 25 has to be publicised and consulted on in the same way as the original statement, with its own period for representations. So a request made in week 10 does not add two weeks to the programme. It adds the time to do the work, plus a fresh consultation period, plus the time for consultees to respond again.

Reducing the risk comes down to scoping. A formal scoping opinion requested before submission binds nobody but tells you what the authority and its consultees expect to see, and an Environmental Statement that follows the scoping opinion chapter by chapter is much harder to call incomplete. Where a consultee's methodology preference is known, use it rather than arguing about it after submission.

Agreed extensions of time

Article 34 allows a longer period agreed in writing between the applicant and the authority, and on EIA schemes this is normal rather than exceptional. Reasons are usually a regulation 25 request, a section 106 that cannot be completed in time, a committee cycle that does not align with the expiry date, or a consultee response that arrives late.

Negotiate the extension rather than letting the period simply expire. A written extension keeps the application alive, protects the authority's performance position and preserves the working relationship, and it lets both sides fix a realistic committee date. Set it against the committee calendar, not against a round number of weeks. Allow for the report writing deadline, which on most authorities falls two to three weeks before the meeting.

One practical caution. Agreeing an extension gives up the right to appeal non-determination for that period, so if the authority is using extensions to avoid a decision rather than to reach one, stop agreeing them.

Appealing non-determination on an EIA scheme

Where the 16 weeks expires with no decision and no agreed extension, the applicant may appeal under section 78 of the Town and Country Planning Act 1990 on the ground of non-determination. The appeal must be made within six months of the expiry of the period.

It is rarely the right move on an EIA application. The Planning Inspectorate will be deciding a scheme on which the authority has reached no position, the section 106 will be unresolved, and an inspector cannot negotiate obligations in the way a case officer can. A non-determination appeal on a major EIA scheme is a tactic for breaking a stalemate, and the cost and delay of an inquiry usually exceed the delay being escaped.

Programming an EIA submission backwards from committee

Build the programme from the target committee date and work back. A workable order for a residential major with an Environmental Statement:

1. Agree the target committee meeting with the case officer, then subtract the report deadline.
2. Subtract the time to resolve the section 106 heads of terms, which on a scheme with affordable housing and highway works is rarely less than two months of parallel working.
3. Subtract a contingency for one regulation 25 request with its own 30 day consultation period.
4. Subtract the 30 day publicity period on the Environmental Statement itself.
5. Subtract the validation check, and assume one round of queries.
6. Fix the submission date from that total, then check the survey seasons for ecology, because a missed bat or newt window moves everything by a year rather than a month.

Written this way, a 16 week statutory period on a complex scheme routinely becomes a nine to twelve month programme from submission to decision. The statutory period tells you when you can start pressing. It does not tell you when you will get a permission. Planning fees also form part of the submission budget, and how the fee schedule is applied and indexed covers the current position.

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. For specialist technical reports, qualified professional input may be required. Browse all 66 PlanScope report types and start a draft.