An ecologist in this context is a consultant who surveys a site, reports what is there, and designs whatever mitigation the development needs. They are working for the applicant and writing for the planning authority, which is a particular kind of professional position and is why their independence matters to both.
What they actually do
Desk study and habitat survey, protected species surveys, biodiversity metric calculations, mitigation and enhancement design, licence applications, and supervision on site during sensitive works. Larger consultancies split those between specialists.
How to choose one
Relevant local experience, the right species licences, professional membership, insurance, and a report you can read. Ask for a redacted example and see whether it says what it means: a report that hedges every finding will generate a further request from the case officer.
What they cannot do
Guarantee an outcome, make a constraint disappear, or survey outside the season. An ecologist who promises any of the three is telling you something about the report you would receive, and a report a planning authority does not trust is worth less than no report at all.
When to appoint
Before the design is fixed. Ecology constraints are much cheaper to design around than to mitigate, the appraisal is what tells you which constraints exist, and the survey seasons mean a late appointment can cost a year rather than a fee.
Questions people ask about ecologist
What is an ecologist?
A professional who surveys and assesses habitats and species; in development work, the consultant who produces the ecology evidence a planning authority relies on.
Is an ecological consultant independent?
They are instructed by the applicant and bound by professional obligations to report accurately. A consultancy that would not report an inconvenient finding is not one to instruct.
Do small householder projects need one?
Sometimes, most often for bats where roof works are proposed on an older building. The preliminary assessment is the proportionate first step.