When a planning condition requires an ecological clerk of works
An ecological clerk of works condition puts a named ecologist on site during clearance and construction. Here is what the role covers, who is competent to hold it, and what it costs.
An ecological clerk of works condition means a suitably qualified ecologist has to be appointed before you start, and has to be on site at defined points during clearance and construction. The role is usually shortened to ECoW. It is not a box-ticking appointment, and councils increasingly want the name, the qualifications and the visit schedule submitted for written approval before any vegetation comes down.
The condition appears on more schemes than people expect. Any site with a bat roost, a badger sett, nesting bird habitat, a watercourse or a large area of scrub clearance is a candidate.
What the role covers on site
The ecological clerk of works is the person who stops the machine. That is the blunt version, and it is the part that matters when a contractor finds something unexpected in a soffit.
The wider job covers pre-commencement checks of features due to be removed, supervision of sensitive operations such as soft-stripping a roof or hand-digging near a sett, delivery of toolbox talks to site staff, marking out exclusion zones and root protection areas, checking that installed mitigation matches the approved drawings, and keeping a written record of every visit.
On a site with a European protected species licence, the ECoW also holds the practical responsibility for making sure the method statement submitted to Natural England is actually followed. That has legal consequences rather than just contractual ones.
Conditions and licences that require one
Three routes bring an ECoW onto a site.
The first is a planning condition, usually worded so that no development shall take place until details of the appointment have been submitted to and approved in writing by the authority. These conditions follow from the duty on authorities under section 40 of the Natural Environment and Rural Communities Act 2006 to have regard to conserving biodiversity, and from the survey findings in a Preliminary Ecological Appraisal or a follow-up survey.
The second is a European protected species mitigation licence from Natural England, granted under the Conservation of Habitats and Species Regulations 2017. Bat licences in particular name a licensed ecologist and set out supervision requirements for the works. The licence conditions bind whether or not the planning condition exists.
The third is a biodiversity gain plan. Where habitat creation or enhancement is secured to deliver the statutory 10 per cent uplift under the Environment Act 2021 regime, supervision during the works protects the retained habitat that the metric depends on. Damage a retained hedgerow during construction and the Biodiversity Net Gain Assessment baseline you were assessed against no longer describes the site.
Competency and who councils accept
There is no statutory register of ecological clerks of works. Authorities fall back on membership of the Chartered Institute of Ecology and Environmental Management at an appropriate grade, relevant species licences held in the person's own name, and demonstrable site experience on comparable schemes.
Where bats, great crested newts, dormice or otters are involved, the person supervising licensable operations must hold or work under the relevant Natural England licence. A Protected Species Survey and any resulting mitigation licence require a suitably licensed ecologist, and an AI-drafted document is a starting point for that professional rather than a substitute for them.
Submit a short curriculum vitae with the discharge application. Two sides, listing qualifications, memberships, licence numbers and three comparable projects, is normally enough. Submitting nothing and naming a consultancy rather than a person is the most common reason these discharges bounce back.
Supervision levels and what they mean in practice
Not every visit is the same thing, and pricing a programme means knowing which is which.
| Supervision level | What happens | Typical trigger |
|---|---|---|
| Pre-commencement check | Walkover to confirm conditions match the survey, features marked out | Before any clearance |
| Toolbox talk | Briefing to site staff on what to look for and who to call | At mobilisation and on crew changes |
| Watching brief | Ecologist present while a specific operation proceeds | Scrub clearance, soft-strip, hand-digging |
| Full supervision | Ecologist directs the operation and can halt it | Licensed works on a roost or sett |
| Post-works check | Confirms mitigation installed as approved | Before sign-off or occupation |
A watching brief and full supervision are often confused in method statements, and the difference shows up when something is found. Under a watching brief the ecologist advises. Under full supervision the ecologist controls the sequence.
Records that evidence compliance
The council will not discharge the condition on a promise. What discharges it is a written record, so build the paperwork into the programme from the start.
- Dated site visit reports with photographs, naming who attended and what was inspected
- Signed toolbox talk registers listing attendees
- A log of any protected species encountered, the action taken and any reporting to Natural England
- As-built records or photographs of installed bat boxes, hibernacula, hedgehog gaps and fencing
- Copies of any licence returns submitted
Keep these on the site file rather than in an ecologist's inbox, and name a person in the site team who is responsible for collecting them after each visit. Conditions are discharged months after the works, by which time the ecologist may have moved on. Where a tree protection condition runs alongside, the same discipline applies to the arboricultural supervision set out in the Tree Survey and its protection plan, and the two sets of records are usually submitted together.
Cost, visit frequency and programme
Fee levels depend on the species involved, travel distance and how many discrete operations need cover. A small residential site with a single soft-strip under a bat licence might need a handful of attendances. A large site with phased clearance across a bird nesting season can need weekly presence for months.
Two programme risks catch developers out. The first is that survey seasons are fixed by biology, so a bat emergence survey cannot be run in January and the works that depend on it cannot be brought forward. The second is that discharging a condition of this kind takes time to determine, and starting work before written approval breaches it regardless of whether an ecologist was present.
Budget the ECoW as a construction cost rather than a consultancy afterthought, and get the appointment agreed at the same time as the principal contractor.
One honest uncertainty runs through all of this. Nobody can tell you in advance how many attendances a site will need, because that depends on what is found once the vegetation comes off. Agree a day rate and a provisional number of visits rather than a fixed fee, and review it after the first walkover.
What happens when the role is skipped
Clearing habitat without the supervision the condition requires is a breach of condition, and the authority can serve a breach of condition notice under section 187A of the Town and Country Planning Act 1990. That is the planning consequence.
The wildlife law consequence is separate and more serious. Deliberately disturbing a bat roost or damaging a badger sett is a criminal offence under the Conservation of Habitats and Species Regulations 2017, the Wildlife and Countryside Act 1981 and the Protection of Badgers Act 1992, whatever the planning position. Contractors and site managers can be liable personally, alongside the developer.
The practical damage is usually delay. Work stops, Natural England is notified, a fresh survey is commissioned at the next available window, and the programme slips to the following season.
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. Draft the ecology documents your scheme needs on PlanScope, then send them for professional review.
Frequently asked questions
What qualifications does an ecological clerk of works need?
There is no statutory qualification. Councils normally look for membership of the Chartered Institute of Ecology and Environmental Management at a suitable grade, a relevant degree, site experience on comparable schemes, and any Natural England species licence the works require in the person's own name. Submit a short curriculum vitae naming the individual rather than the consultancy.
Can the same ecologist who wrote the survey act as clerk of works?
Usually yes, and there are practical advantages because they already know the site and the mitigation design. The council may still ask for the appointment to be confirmed in writing, and where licensable works are involved the person supervising must hold or work under the correct Natural England licence.
Is an ecological clerk of works the same as a watching brief?
No. A watching brief is one supervision level the clerk of works may provide, where the ecologist is present while an operation proceeds and advises. Full supervision goes further, with the ecologist directing the sequence and able to halt work. A method statement should say which level applies to which operation.
When does the condition have to be discharged?
Most are worded to bite before development starts, so the details have to be submitted and approved in writing before anything happens on site, including clearance. Allow eight weeks for determination of the discharge application, and do not rely on starting while it is pending, because that is a breach of condition in itself.
What happens if a protected species is found after work starts?
Work in that area stops immediately. The ecologist assesses the situation, and if a European protected species is involved Natural England is contacted about whether a licence or a variation is needed. Resuming before that is resolved risks a criminal offence under wildlife legislation, separate from any planning breach.
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.