Ecological Clerk of Works Role

An Ecological Clerk of Works (ECoW) monitors construction activities to ensure ecological mitigation is implemented.
The ECoW role is often required as a planning condition on projects affecting sensitive ecological habitats.
They supervise protected species mitigation including reptile translocation, newt fencing, and bat exclusions.
The ECoW has authority to stop work if protected species or habitats are being harmed by construction.
They advise the construction team on seasonal restrictions including bird nesting and hibernation periods.
Pre-commencement checks by the ECoW may be required before vegetation clearance or demolition begins.
The ECoW records compliance evidence including photographs, surveys, and daily monitoring logs.
They liaise between the construction team, the local planning authority, and Natural England.
Not all projects need a full-time ECoW — the requirement depends on ecological sensitivity and planning conditions.
Site workers should know who the ECoW is and how to report ecological concerns to them.

Planning compliance	The ECoW ensures ecological conditions attached to planning permission are met, preventing enforcement action.
Species protection	Protected species legislation carries criminal penalties — the ECoW prevents accidental offences during construction.
Expert guidance	Construction teams are not ecologists — the ECoW provides specialist advice that prevents costly mistakes.

Do

Don't

Introduce the ECoW to the construction team and explain their role and authority
Follow the ECoW instructions on ecological mitigation measures without exception
Stop work immediately if the ECoW directs you to halt for ecological reasons
Report any wildlife sightings, nesting birds, or ecological concerns to the ECoW
Allow the ECoW to carry out pre-commencement checks before clearing vegetation
Include the ECoW in project planning meetings to coordinate seasonal constraints
Support the ECoW with access, plant, and personnel when they need site assistance
Provide the ECoW with copies of method statements affecting ecological areas
Respect ecological exclusion zones and fencing installed under ECoW supervision
Retain all ecological monitoring records and compliance evidence for the project file

DON'T ignore the ECoW's stop-work instruction — they have authority to halt activities
DON'T clear vegetation, fell trees, or demolish structures without ECoW clearance
DON'T remove or damage ecological fencing, barriers, or translocation sites
DON'T treat ecological requirements as obstacles — they are legal planning conditions
DON'T carry out work in ecological exclusion zones without ECoW authorisation
DON'T handle or move protected species without the ECoW present and a valid licence
DON'T start work in sensitive areas outside the agreed seasonal working windows
DON'T dismiss wildlife sightings as unimportant — report them to the ECoW always
DON'T bypass the ECoW to speed up the programme — the penalties outweigh any gain
DON'T assume the ECoW role is advisory only — on many projects it carries stop-work power

See also: Protected Species Awareness | Nesting Birds and Seasonal Restrictions

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