Arboriculturist qualifications for a BS 5837 survey

BS 5837:2012 asks for tree work at planning stage to be carried out by an arboriculturist, which the standard describes as someone who has gained expertise in trees through relevant education, training and experience. It does not name a qualification, and that vagueness is why councils end up rejecting surveys. The practical test most local planning authorities apply is whether the author holds a recognised arboricultural qualification at technician level or above, carries professional indemnity insurance, and has no financial interest in the tree works being recommended.

If you are a homeowner commissioning a tree survey for an extension, that last point matters more than the letters after anyone's name. A quote from the firm that will fell the tree is not a survey.

What the standard expects of the author

The standard sets out a sequence rather than a single document. A tree survey records each tree with its species, height, stem diameter, crown spread, age class, physiological and structural condition, estimated remaining contribution, and a category. The categories run U, A, B and C, with subcategories for arboricultural, landscape and cultural value, and the category drives everything that follows.

From the survey come the constraints: the root protection area for each retained tree, calculated from stem diameter and capped for very large trees, and the shading and future growth constraints that affect where you can put a building. Then the arboricultural impact assessment, which tests the proposed layout against those constraints. Then the method statement and tree protection plan, which say how the retained trees will survive construction.

Each stage needs judgement rather than measurement. Assigning a category to a tree is a professional opinion that the council can and does challenge, and the person forming it needs to be able to defend it.

Qualifications and registers worth looking for

There is no statutory register, so you are looking for a combination rather than a single credential.

• A Level 4 qualification in arboriculture as a minimum for survey work, with Level 6 or a degree for impact assessment and expert evidence
• Professional membership of the Arboricultural Association at technician or professional grade, or chartered status through the Institute of Chartered Foresters
• Registered Consultant status with the Arboricultural Association, which carries an assessment of competence and insurance
• Demonstrable experience of BS 5837 work in the same authority area, which usually means the officer already knows the name

Ask for examples of surveys the consultant has produced for planning applications and whether any have been challenged. A consultant who has been to appeal on a tree issue and can explain what happened is worth more than one who has never been questioned.

Insurance matters because tree advice is advice. Professional indemnity cover should be current and should explicitly cover arboricultural consultancy, and the level should be proportionate to the value of the development rather than to the fee for the survey. Public liability cover for site visits is a separate thing and does not substitute for it.

Consultant against contractor

Tree contractors are qualified in a different direction. Their competence is in climbing, cutting and rigging, evidenced by chainsaw and aerial rescue certificates, and a good contractor knows a great deal about tree condition. What they are not set up to do is produce an independent planning document that recommends retention.

The conflict is structural. A firm paid to remove trees has an interest in recommending removal. A firm quoting for protective fencing has an interest in specifying more of it. Councils know this, and a survey on a contractor's letterhead is examined harder than one from a consultancy.

The clean arrangement is to commission the survey and the impact assessment from a consultant, then tender the works separately, with the consultant checking that the protection measures have been installed. Where the consultant's appointment later moves across to the contractor, the independence question comes back, and the practical handling of that is covered in novating a consultant appointment to the contractor.

Survey against impact assessment

These are different documents and they are priced differently, which is the source of most misunderstandings about fees.

A council asking for an Arboricultural Impact Assessment expects all of the first three at least. A survey on its own, with no assessment of the proposal, gets a validation query. And the survey needs to sit on an accurate base, which is why a measured topographical survey usually comes first, as set out in specifying a topographical survey for a planning application.

Reading a survey you have paid for

You do not need to be an arboriculturist to spot the weaknesses that councils pick up.

Check that every tree on and adjacent to the site is included, including those in neighbouring gardens whose canopies or roots reach the site. Trees just over the boundary are the ones most often missed and they are fully material.

Check that the root protection areas are drawn on the layout rather than only tabulated. Check whether any of them overlap the proposed building, the drainage runs or the site access, because an overlap that is not explained is a refusal reason. Check whether the survey mentions the tree preservation order or conservation area status, and whether the council's tree officer has been consulted informally.

Then check the categories against your own eyes. A mature oak in good condition categorised as C, conveniently allowing its removal, is the kind of thing a tree officer spots in minutes.

When a council will challenge the author

Officers challenge authorship in a small number of recognisable situations. The survey comes from the firm quoting for the felling. The document carries no author name, qualifications or date. The methodology section does not mention BS 5837 at all, or cites a superseded version. The categories are inconsistent with the photographs. Or the survey is three years old and the trees have grown, been pruned or been damaged since.

The cure is usually a short addendum from a properly qualified consultant rather than a new survey, so ask the officer what specifically is not accepted. Where the dispute is about a protected tree, remember that works to a tree covered by an order need consent, and works to a tree in a conservation area need six weeks notice to the council under section 211.

If you would rather have the report reviewed by someone qualified before it goes in, PlanScope's professional directory is the route for arranging independent review and sign-off of a draft. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For a tree survey and impact assessment, councils usually expect a suitably qualified author, and professional input is strongly advised.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.