Professional indemnity insurance for ecologists and arboriculturists

Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-05

An ecologist's Preliminary Ecological Appraisal or a Biodiversity Net Gain assessment, and an arboriculturist's BS 5837 tree survey, are relied on by developers, planners and landowners to make decisions worth far more than the fee charged for the report. When one of those decisions goes wrong and the client blames the survey, the exposure sits with the consultant. Professional indemnity insurance exists to meet exactly that risk.

Why this profession carries real report liability

Ecological and arboricultural work is advisory. You are paid for judgement — what species are present, whether a tree is safe or worth retaining, how a scheme achieves net gain — and that judgement is documented, submitted and acted on. The financial consequences of getting it wrong are borne by others, which is what makes the work a professional liability, not a physical one.

Common ways a claim arises in this field include:

• Missed or misidentified protected species — a bat roost, great crested newt population or badger sett not picked up in survey, leading to a stop on works, redesign, delay or enforcement under the Wildlife and Countryside Act 1981 or the Conservation of Habitats and Species Regulations 2017.
• Biodiversity Net Gain shortfalls — a BNG assessment or metric calculation that the Local Planning Authority rejects, or a habitat baseline that proves wrong, forcing the client to buy units, redesign or lose consent.
• Survey scope and timing failures — a Preliminary Ecological Appraisal that misses the appropriate survey season, so the client discovers a constraint late in the programme.
• Tree report errors — a BS 5837 constraints report, tree condition report or mortgage tree report that under-states risk or over-states retention value, leading to a failed planning application, an unexpected felling cost, or property damage attributed to a tree wrongly assessed as safe.
• Root protection and construction advice — arboricultural method statements or root protection area recommendations that a client says were inadequate.

In each case the allegation is the same: the professional owed a duty of care, the work fell below a reasonable standard, and the client suffered a financial loss as a result. PI insurance responds to defence costs and to damages if the claim is upheld.

Is professional indemnity insurance required?

There is no single UK statute forcing an ecologist or arboriculturist to hold PI. In practice, though, you will usually need it for one of three reasons:

Professional bodies and registers. The Chartered Institute of Ecology and Environmental Management (CIEEM) expects members offering consultancy to hold appropriate professional indemnity cover as part of acting competently and responsibly. The Arboricultural Association's Registered Consultant scheme requires consultants to carry PI insurance. Membership of the Institute of Chartered Foresters carries similar professional expectations. If you trade on a register, cover is effectively a condition of it.

Clients and frameworks. Developers, local authorities, utilities, engineering consultancies and public frameworks almost always set a minimum PI limit in their contract or pre-qualification. A subcontract to a larger multidisciplinary firm will typically require you to hold and evidence cover.

Sensible risk management. Even where nobody insists, a single disputed report can generate legal costs that dwarf a small consultancy's annual fee income. PI is what stops a defensible mistake — or even an unfounded allegation you still have to defend — from ending the business.

Tell us what reports you produce and we'll confirm the limit you actually need →

How much cover — choosing a limit of indemnity

PI is written with a limit of indemnity — the most the insurer will pay. The right figure is driven by the value of the schemes your reports feed into and by what your clients contractually require, not by the size of your fees. A sole ecologist advising on small residential BNG has a different exposure from an arboricultural consultant on major infrastructure.

These figures are illustrative options, not a recommendation for your business. Two further points matter as much as the headline number:

• Aggregate vs each-and-every-claim. Many PI policies apply the limit in the aggregate — a total across the policy year. If a client contract demands the limit "for each claim", the wording has to reflect that.
• Fees, costs and defence. Check whether defence costs sit inside or on top of the limit, and what the excess is. Defence is often the largest early cost even when a claim ultimately fails.

Claims-made cover and why continuity matters

PI is written on a claims-made basis. What counts is that the policy is live when the claim is made against you — not when you did the survey. A tree report or ecological appraisal can be challenged years after submission, once a development completes or a tree fails, so cover must be kept in force continuously to respond to past work.

This has two practical consequences. First, if you let cover lapse, past reports may be left unprotected. Second, when you retire or close the practice, you may need run-off cover to keep responding to claims about work already done. We flag both when we set a policy up, so there are no gaps behind you.

What a good policy should include

For this profession, the wording should reflect the specific work you do. When placing cover, look for:

• An accurate description of activities — ecological survey and assessment, protected species work, BNG assessment and metric calculation, arboricultural survey to BS 5837, tree condition and risk assessment, method statements and monitoring. Under-declaring what you do is a common cause of a claim being contested.
• Cover for sub-consultants if you bring in specialist surveyors (for example bat or newt licensed ecologists).
• Retroactive cover back to when you started trading, so historic reports are picked up.
• Appropriate limit and basis to satisfy your registers and your largest client contracts.

PI covers financial loss from professional error. It does not cover injury or property damage caused by your physical activities on site — that is the job of public liability insurance, which many field-based ecologists and arborists carry alongside PI. If you employ staff, employers' liability is a legal requirement. We can arrange these together.

How Apex places it

Apex Insurance Brokers is an FCA-authorised broker (FRN 724952) based in Bristol. We are independent, so we place your cover across insurers rather than pushing one product. For ecologists and arboriculturists that means:

• We take time to understand your report types, client base and any register or framework requirements before we quote.
• We match the limit, basis and wording to your CIEEM, Arboricultural Association or client obligations, and explain the trade-offs in plain terms.
• We keep continuity and run-off in view so past work stays protected as your practice changes.
• If a claim or a circumstance arises, you have a broker who knows your file and can help you notify correctly and on time.

Start a professional indemnity quote for your consultancy →

Common questions

Does Biodiversity Net Gain increase my PI exposure?
It can. Mandatory BNG under the Environment Act 2021 means more ecological assessments carry direct commercial consequences — if a metric calculation or baseline is challenged and the client has to buy units or redesign, the loss can be significant. Make sure your policy description explicitly covers BNG assessment work.

I only produce mortgage or homebuyer tree reports. Do I still need PI?
Yes. Those reports are relied on by lenders, buyers and homeowners for decisions about property, so an alleged error can still generate a financial-loss claim. The limit may be lower than for major development work, but the need for cover is the same.

What happens to my old reports if I stop trading?
Because PI is claims-made, a claim about past work is only met if a policy is in force when it is made. When you close or retire, run-off cover keeps responding to those historic reports. We will discuss the right run-off period when the time comes so you are not exposed on work you have already delivered.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This guide is general information, not advice on a specific policy or a substitute for your policy wording.