Arboricultural competence and the BS 5837 survey author

Nobody needs a licence to call themselves an arboriculturist in the UK, which is why arboriculturist qualifications matter more here than in regulated fields. A tree survey to BS 5837:2012 is a technical document that drives layout, foundation design and root protection, and a council that doubts the author will either ask for it again or condition around it. Check the credentials before you commission, because a survey redone in the wrong season costs a year.

The standard itself says nothing about who may write the report. It assumes a competent person and describes what that person produces.

What a survey to BS 5837 actually contains

The survey records each tree, or each group, with species, height, stem diameter measured at 1.5 metres, branch spread at four points, crown clearance height, age class, physiological and structural condition, preliminary management recommendations, and an estimated remaining contribution expressed in bands of years.

Each tree is then categorised. Category U covers trees that should be removed regardless of the development. Categories A, B and C run from high through moderate to low quality, with subcategories recording whether the value is arboricultural, landscape or cultural. The categorisation is a judgement, and it is the part of the report that gets argued about.

From that survey come three further documents: the root protection area for each retained tree, calculated from stem diameter and plotted on plan; the impact assessment that tests the layout against those constraints; and the method statement and tree protection plan that control construction. The tree survey page sets out how the whole set fits together.

Qualifications and memberships that signal competence

There is no register you must be on. There are several that mean something.

• Registered Consultant status with the Arboricultural Association, which involves assessment of submitted work and is the strongest single signal for planning reports.
• Chartered Arboriculturist through the Institute of Chartered Foresters, which carries a professional review and continuing development requirement.
• Graded membership of the Arboricultural Association at professional member or fellow level.
• Academic and vocational qualifications: the Level 4 technician certificate, the Level 6 professional diploma, or a degree in arboriculture or a closely related subject.
• Professional Tree Inspection certification, which matters for condition assessment rather than for design work.

What none of these tells you is whether the author has done this kind of scheme before. A consultant who writes mostly for utility clients will produce a competent survey and may be unfamiliar with what a development management officer expects to see. Ask for two recent examples of reports submitted with planning applications in England, with the client's permission.

Consultant and contractor are different appointments

Tree surgery firms employ skilled people, and chainsaw and climbing certification is a genuine qualification. It is not a qualification to write a survey that recommends removals.

The distinction that councils care about is between advising and doing. An advising arboriculturist assesses, categorises and specifies. A contractor implements. Some firms do both, competently, and the problem is not competence. The problem is that a report recommending the removal of four category B trees, written by the firm that will invoice for removing them, reads differently to a case officer than the same report from an independent consultant.

Independence where the survey supports removals

Where the scheme retains everything and the report is a formality, the point is academic. Where the layout depends on losing a mature tree, independence is worth paying for.

Set it out explicitly in the report. Name the instructing party, state that the author has no financial interest in the works recommended, and record the basis of the categorisation for any tree proposed for removal. If the tree is protected by a Tree Preservation Order or stands in a conservation area, the justification has to stand on its own, because the authority is applying a statutory regime rather than a design preference. Our note on independence and conflicts of interest in planning evidence covers the wider point across disciplines.

Checking a survey before it goes in

You do not need to be an arboriculturist to find the common faults. Work through this list before the report is bound into the application.

The third party tree point catches out more schemes than any other item on that list. A neighbour's oak with a root protection area extending eight metres into your site is a design constraint you cannot negotiate away, and it needs to be on the constraints plan from the first sketch.

Illustrative example: a five dwelling infill scheme submitted with a survey carried out in January. The category assessments were sound, but the report did not plot the root protection area of a mature lime on the adjoining plot. The revised layout, produced after the case officer raised it, lost one unit. A short survey addendum at the outset would have shown the constraint before the appraisal was fixed.

Method statements need an author with site experience

The arboricultural method statement is the document that keeps trees alive through construction, and it is the one most often written by someone who has never stood on a site during a dig. It has to specify the protective fencing type and position, the ground protection where access is unavoidable, the no dig construction detail with its build up, the sequencing relative to other trades, the service routeing, and the supervision regime.

Ask who will carry out the site monitoring and how often. A method statement that says monitoring will be undertaken at appropriate intervals will be conditioned with a schedule anyway, so agree the schedule before submission and put it in the document. Guidance on scoping this properly is in writing a brief for a specialist planning report.

Records to keep during construction

Conditions attached to permission usually require the protection measures to be installed before any equipment or materials arrive, and to remain until completion. Discharging those conditions at the end needs evidence you have to gather as you go.

Keep dated photographs of fencing at installation and at each monitoring visit, the monitoring reports themselves, a record of any incursion into a protected area and what was done about it, and written approval for any variation from the method statement. Where the authority asks for a completion certificate from the arboriculturist, that certificate rests on those records. Reviewing a report prepared by someone else, whether at the outset or at the end, is covered in reviewing a specialist report you did not commission, and the professional directory is the route to a reviewer for an AI-assisted draft.

Councils usually expect a suitably qualified author for arboricultural work, and professional review of any draft is strongly advised before it is submitted.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.