Ecological clerk of works: when a site needs one

An ecological clerk of works is the ecologist who attends site during construction to make sure the mitigation promised in the planning documents actually happens. The appointment is normally secured by a planning condition on schemes where protected species, retained habitat or a licence are involved, and the condition usually requires the name and qualifications of the appointee to be submitted and approved before development begins. An ecological clerk of works condition is not a formality: the role carries the authority to stop work, and a developer who treats it as a tick-box exercise discovers that at the worst moment.

The cost is modest. The cost of getting it wrong is a stopped site and, in the worst case, an offence.

What the role covers on site

Five things, in descending order of how often they matter.

Pre-works checks: walking the site before clearance to confirm that nothing has moved in since the survey, which it frequently has. Toolbox talks: briefing the groundworkers and machine operators on what is protected, what the fencing means and what to do if an animal is found. Supervision of sensitive operations such as hedgerow removal, demolition of a building with bat potential, soft-strip of a roof, or excavation near a badger sett. Inspection of retained features, which means checking that protective fencing is where the plan says and has not been moved for access. And recording, because the condition will require a report.

The role is not design and it is not a survey. An ecological clerk of works implements a method statement somebody else wrote. If the method statement is wrong, they say so, and that conversation is far better at the start than halfway through.

Conditions that require supervision

The conditions that bring the role in are predictable, and reading them carefully tells you the scope.

Where a licence is in place for a European protected species, the licence itself usually names a supervising ecologist and specifies what they must do, and that requirement sits above the planning condition. Where a Protected Species Survey has identified badgers, nesting birds, reptiles or amphibians, a condition will require the mitigation in the approved method statement to be implemented under ecological supervision. Where a biodiversity net gain plan has been approved, habitat creation and translocation works are often conditioned for supervision because establishment failure is the usual reason gains are not delivered. And where retained trees or hedgerows have ecological value, the arboricultural and ecological supervision conditions overlap.

Read whether the condition requires supervision or merely requires a watching role. Supervision implies attendance at the operation. A watching brief implies attendance at intervals.

Qualifications and licence requirements

There is no single qualification called ecological clerk of works, so judge the person by three things.

Chartered or full membership of the Chartered Institute of Ecology and Environmental Management, which carries a code of professional conduct and a competency framework. Species-specific licences where the work needs them, because handling or disturbing a European protected species requires a licensed ecologist under the Conservation of Habitats and Species Regulations 2017 and the Wildlife and Countryside Act 1981, and a clerk of works who is not licensed cannot carry out the licensable activity even if they can supervise around it. And construction site experience, which is a separate competence from survey work: reading a drawing, dealing with a site manager, and understanding why the crane is where it is.

Confirm which licence class the person holds and whether they are named on the project licence. A registered consultant on one species group is not automatically competent on another, and the mismatch between the species on site and the licence held is the most common appointment error.

Surveys and mitigation licences for European protected species legally require a suitably licensed ecologist, and a drafted method statement is a starting point for that professional rather than a substitute.

Frequency of attendance and reporting

Set this out in the method statement so the condition can be discharged against it, and so the fee is predictable.

A reasonable pattern on a small to medium site: one pre-commencement walkover, one toolbox talk at mobilisation and repeat talks when a new gang arrives, attendance for each specific sensitive operation, monthly inspections during the main construction period, and a final inspection at completion of habitat works. Larger or more sensitive sites need more, and licensed works often specify the frequency.

Reporting should be short and dated. A site visit record naming the date, who was present, what was inspected, what was found, any non-compliance and the action required, issued within a few days. Those records are the evidence that discharges the condition at the end, and assembling them retrospectively from memory is both difficult and unconvincing.

Powers to stop work and how they are agreed

The clerk of works has no legal power to stop a site. The contract gives them one, or it does not.

So the stop-work authority has to be written into the appointment and into the construction contract, with a named person who can be reached immediately and an agreed escalation route. The practical arrangement that works is a standing instruction that the site manager halts the relevant operation on the ecologist's instruction, logs it, and the two of them resolve it with the client informed within the day.

Without that arrangement, the ecologist who finds a nesting bird in a hedge that is being flailed has two options: persuade the operator, or report a potential offence. Neither is a good position to put a consultant in, and neither protects the developer.

Illustrative example: a soft-strip of a barn roof with a bat roost recorded under licence. The ecologist attends, the tiles come off by hand in the agreed sequence, and a bat is found in a location the method statement did not anticipate. Work stops on that elevation, the bat is dealt with under the licence, the method statement is varied with the licensing body, and the rest of the site carries on. That is the system working. Without the stop authority, the roof comes off and the offence is committed.

Records that satisfy the condition

The discharge submission at the end is a compliance report, and it is the same material every time.

What to include: the appointment details and qualifications of the ecologist, the approved method statement being implemented, every site visit record in date order, the toolbox talk records with attendance, photographs of protective fencing and of each sensitive operation, records of any animals found and how they were handled, any non-compliance with the corrective action taken, the licence return where a licence was in force, and a closing statement confirming whether the approved mitigation was delivered in full.

Where habitat creation is involved, add the as-built habitat plan and the first monitoring record, because the biodiversity gain regime runs for 30 years and the baseline for that monitoring starts here. The Biodiversity Net Gain Assessment and the gain plan set what has to be evidenced.

Budgeting for the appointment

Price it as a day rate against a stated number of visits, with a mechanism for additional attendance.

The variables that move the cost are the number of sensitive operations, the duration of the construction programme, travel distance, whether licensed handling is required, and whether the site is phased, since a three-phase site means the pre-works checks happen three times. Put a contingency against unexpected finds, because the one thing certain about ecology on site is that something will be found that the survey did not record.

The saving is in sequencing. Clearance outside the bird nesting season from March to August removes a whole category of supervision. Demolition outside the bat activity season reduces another. Programme the sensitive operations into the right windows and the clerk of works attends fewer times for less money. How the authorship of these documents is checked is covered in who can sign a construction management plan, and the reviewer side of the appointment sits in the professional directory.

Surveys and mitigation licences for protected species legally require a suitably licensed ecologist, and PlanScope's draft is a starting point for that professional rather than a substitute. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.