What drives the cost of an environmental statement
Two documents decide what an environmental statement costs: the screening opinion and the scoping opinion. What drives the spend after that, and the second round nobody budgets for.
Environmental statement cost drivers are mostly decided before a single survey is commissioned. Two documents fix the budget: the screening opinion that says whether you need an environmental statement at all, and the scoping opinion that says which topics it has to cover. Everything after that is the price of executing decisions already made.
Developers who treat an environmental statement as a procurement exercise, shopping a fixed brief around for quotes, tend to overpay. The money is in scope, seasonality and iteration.
Screening comes before anything else
Schedule 1 to the Town and Country Planning (Environmental Impact Assessment) Regulations 2017 lists development where an environmental statement is mandatory. Schedule 2 lists categories where it depends on the characteristics of the development, its location and the likely effects, judged against the Schedule 3 selection criteria. Most schemes that worry about EIA sit in Schedule 2.
Request a screening opinion from the local planning authority and wait for it. The request costs nothing, the authority has three weeks to respond unless it agrees a longer period, and a written negative screening opinion is the least expensive document in the whole process. Skipping it and volunteering an environmental statement because a consultant suggested it is one of the more expensive mistakes available on a mid-sized scheme.
Where screening is positive, the scale of the answer changes. A positive opinion on a 40-unit edge-of-settlement site is a different exercise from one on a strategic allocation, because the number of receptors and the number of technical disciplines both rise.
How a scoping opinion controls the budget
Scoping is voluntary in law and close to compulsory in practice. Under the 2017 Regulations the authority consults and issues a scoping opinion within five weeks of a request, and that opinion becomes the specification your consultants price against.
The lever available to you is the scoping request itself. A request that proposes a scope, gives reasons for scoping topics out, and identifies the assessment methodology for each topic in, will usually be adopted with amendments. A request that asks the authority what it would like almost always comes back longer. Statutory consultees add topics when the applicant has not explained why they are unnecessary.
Scope out with evidence, not assertion. A site with no watercourse within 500 metres and a Flood Zone 1 designation can argue flood risk down to a proportionate chapter rather than a full assessment. A site three fields from a Special Area of Conservation cannot.
The topics that dominate the cost
Environmental statement chapters are not equally expensive. Four groups account for most of the spend on a typical residential or mixed-use scheme.
| Cost group | What drives it |
|---|---|
| Ecology | Survey seasons, repeat visits, licences, and biodiversity net gain metric work |
| Transport | Traffic counts, junction modelling, and any strategic model runs the highway authority requires |
| Landscape and visual | Number of viewpoints, photomontage quality, and winter plus summer photography |
| Ground conditions and water | Intrusive investigation, laboratory scheduling, and hydrogeological risk assessment |
Ecology is the one that moves programmes as well as budgets. Bat emergence surveys run from May to September, great crested newt work is tied to a spring window, and breeding bird survey visits span March to August. Miss a season and you wait a year, which costs far more in holding charges than the surveys themselves. Air quality, noise and heritage chapters usually cost less per chapter, and they escalate where monitoring or modelling is needed rather than desk assessment.
Contaminated land is the chapter most likely to double. A Phase 1 desk study is modest in cost, and a Phase 2 intrusive investigation on a former industrial site with made ground and ground gas is a different order of cost. The cost of a contaminated land investigation programme is worth understanding separately before you set the EIA budget, and both phases must be prepared in accordance with BS 10175 by suitably qualified and experienced people.
Cumulative effects and other people's schemes
Cumulative assessment is the sleeper cost. The environmental statement has to consider effects in combination with other existing and approved development, which means somebody has to identify the relevant schemes, obtain their documents, and assess the combined effect for each topic.
On a quiet rural site that is an afternoon's work. In a growth area with three consented allocations and a live application next door, it becomes a workstream with its own coordination cost, and it is sensitive to timing: a scheme consented after your baseline date can force a topic chapter to be revisited. Agree the cumulative list with the authority at scoping and record the cut-off date in the statement.
The competent expert requirement
The 2017 Regulations require the environmental statement to be prepared by competent experts, and the authority must be satisfied it was. That is a legal requirement rather than a preference, and it shapes the cost in two ways.
Each technical chapter needs an author whose competence is demonstrable through membership of the relevant institute and comparable project experience. A statement of competence naming the authors and their qualifications now appears in most environmental statements as a matter of routine. And the coordination role, the person who makes the chapters consistent, sits above the technical fees rather than inside them.
An Environmental Impact Assessment draft that structures the chapters, sets out the policy framework, lists the methodology and flags where site data is missing does real work at the start of that process. It is a starting point for the competent experts who must prepare and sign the statement, never a substitute for them, and no drafted document satisfies the competence requirement on its own.
Addenda, further information and re-consultation
The cost line nobody budgets is the second round. Regulation 25 allows the authority to require further information where it considers the statement inadequate, and the response is usually an addendum that has to be published and consulted on again.
Three things reduce the risk. Front-load the mitigation so consultees see the answer rather than only the problem. Circulate draft chapters to the consultees who commented at scoping, particularly the lead local flood authority and the highway authority, before submission. And keep the non-technical summary honest, because a summary that understates a residual effect invites a challenge to the whole document.
Determination for EIA development runs to 16 weeks rather than 13, and an addendum with a fresh 30-day consultation period extends that well beyond. Holding costs over those months usually exceed the fee for the addendum itself.
Controlling scope without weakening the statement
There is a difference between a lean statement and a thin one. A lean statement assesses fewer topics in appropriate depth because the irrelevant ones were argued out at scoping with evidence. A thin one assesses everything briefly and gets a Regulation 25 request.
Practical controls that work:
- Commission the ecology walkover and the Phase 1 desk study before scoping, so the request is written with real baseline information.
- Propose the assessment methodology for every topic in the scoping request and name the guidance you will follow.
- Fix the design earlier than feels comfortable, because every layout change after baseline collection ripples through several chapters.
- Appoint one coordinator with authority over the chapter authors.
- Agree the cumulative schemes list and the baseline cut-off in writing.
One honest uncertainty: authorities differ in how readily they accept topics being scoped out, and a scoping opinion from a well-resourced authority with an in-house ecologist will look different from one issued by a small district relying on county advice. Ask at pre-application which consultees the authority will send the request to, because that list predicts the length of the opinion better than the site does.
PlanScope pricing is published as one free report, £50 per report, or £150 per month for unlimited reports on the Professional tier, and you can see pricing before you commit. 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.
Frequently asked questions
Is there a fee for a screening or scoping opinion?
No fee is payable for either request under the EIA Regulations 2017. The authority has three weeks to issue a screening opinion unless a longer period is agreed, and five weeks for a scoping opinion. A written negative screening opinion is the least expensive document in the process and worth requesting before any consultant is appointed.
Which environmental statement chapters cost the most?
Ecology, transport, landscape and visual, and ground conditions and water usually account for most of the spend. Ecology drives programme as well as cost because survey seasons cannot be compressed. Contaminated land can move by an order of magnitude between a desk study and an intrusive investigation on a former industrial site with made ground.
Can I scope topics out of an environmental statement?
Yes, with evidence. A scoping request that proposes a scope, gives reasons for excluding topics and names the methodology for each topic retained will usually be accepted with amendments. A request that asks the authority what it wants comes back longer, because statutory consultees add topics where the applicant has not explained why they are unnecessary.
Who has to prepare an environmental statement?
The EIA Regulations 2017 require preparation by competent experts, and the local planning authority must be satisfied that was the case. Each chapter needs an author whose competence is demonstrable through institute membership and comparable project experience. Most statements now include a statement of competence naming the authors and their qualifications.
How long does determination take for EIA development?
The statutory period is 16 weeks rather than the 13 weeks for other major development. Where the authority requires further information under Regulation 25, the addendum has to be published and consulted on again, which extends the timetable well beyond that. Holding costs over those additional months often exceed the fee for the addendum.
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.