Consulting Arborist

The deliverable is a document: a tree risk assessment, a condition report, an inventory, a preservation plan for a development, an appraisal of value after damage, or a specification a contractor can be held to. The site visit is the input; the writing is the work.

A risk assessment follows a recognised methodology and separates three things — the likelihood of failure, the likelihood of impact, and the consequences — into a rated level of risk with recommended mitigation. That structure is what lets an owner demonstrate they assessed and acted reasonably.

A tree preservation plan for a construction site is more demanding: root protection areas, what may happen inside them, how services will be routed, and what supervision is required during works. It is written to be enforced.

Ask what methodology the assessment follows and what qualifications support it. A recognised risk-assessment qualification and membership of a consulting body are the usual markers, and for anything contentious, prior experience giving evidence matters more than either.

Independence is the asset you are buying. An assessor who also quotes for the remedial work they recommend has an obvious interest in recommending it, and that is the first thing a challenge will point at. For disputes, insurance and planning, keep the two separate.

Testing equipment — resistance drilling, tomography, aerial inspection — is charged separately and is not always warranted. A consultant who reaches for a decay detector on every tree is selling equipment time.

Hourly rates, per-report fees or a day rate plus writing time are all common. Scope is what drives the number: a single-tree condition report and a full campus inventory differ by an order of magnitude, and so does a report written for a neighbour dispute versus one written for a planning submission.

Expert witness work prices differently again, and reasonably so — it carries the obligation to defend the opinion in a formal setting.

Agree the deliverable, the deadline and the fee basis in writing before the site visit. Treelign carries no payments and holds nothing in escrow; the arrangement is entirely between you and the consultant.

You need one when someone else will scrutinise the decision: a planning authority, an insurer, a court, a buyer, or a claimant. In those situations an undocumented judgement, however sound, is worth very little.

You also need one when the duty of care is real — trees over a public footpath, a car park, a school boundary — and nobody has assessed them on a defined cycle. The report is the record that the duty was discharged.

You do not need one to decide whether a dead tree should come down. If the question has an obvious answer and nobody is going to challenge it, hiring a consultant to write it down is a cost without a benefit.

Post the job with what the report is for, how many trees, and the deadline it faces — those three facts determine the effort and therefore the quote. Consultants whose service radius covers the site are alerted immediately.

Expect a scoping conversation before anyone commits. On consulting work, the exchange that defines the deliverable is part of the service, and a consultant who quotes without it is quoting for a report they have imagined.

Reports travel further than crews do, so a consultant may cover a much wider area than a climbing outfit — including specialists who take instructions well outside their home region. Fees are agreed directly with them.