Arboricultural competence under BS 5837:2012
The standard names no qualification, only the arboriculturist. What councils actually look for, the three separate deliverables, and the checks that catch a weak survey.
BS 5837:2012 does not name a qualification. It refers throughout to the arboriculturist, which it treats as a person with the training and experience to give sound advice on trees, and it leaves councils to judge whether the author in front of them meets that description. In practice, when a council asks for a bs 5837 qualified arboriculturist it is looking for a recognised technical qualification, evidence of survey experience and a report that follows the standard's structure.
Most rejected tree submissions fail on the second and third of those rather than the first. A qualified author who has produced a survey without an impact assessment, or an impact assessment without a method statement, has still given the council an incomplete submission.
What the standard expects of the author
The standard is a recommendations document, not a regulation, so it does not set a licensing regime. What it does set is a method: how to record trees, how to categorise them, how to calculate a root protection area, how to assess the effect of a proposal and how to specify protection during construction.
An author working to it has to make judgements that need training. Assigning a tree to category A rather than B is an estimate of remaining contribution, usually expressed as 40 or more years for category A, 20 or more for B and 10 or more for C, with U reserved for trees that should be removed regardless of the development. Getting that wrong in either direction damages the application: over-grade the trees and the layout looks undeliverable, under-grade them and the tree officer will say so.
Root protection areas are calculated as a radius of 12 times the stem diameter, capped at an area of 707 m². That is arithmetic. Deciding whether the resulting circle should be reshaped because of soil conditions, past construction or a one-sided root system is not.
Survey, impact assessment and method statement as separate outputs
These are three deliverables, and conflating them is the commonest scoping error in a fee proposal.
The tree survey records every tree on and adjacent to the site: species, height, stem diameter, crown spread by compass direction, age class, physiological and structural condition, estimated remaining contribution and category. It exists independently of any design.
The impact assessment takes a layout and tests it against the survey. It identifies trees to be removed, trees affected by shading or level change, incursions into root protection areas and conflicts with drainage, roads and service runs. It is design-dependent, so it cannot be written before the layout is settled.
The method statement and tree protection plan say how retained trees will survive construction: barrier specification and position, no-dig surfacing build-ups, hand-dig zones, service routing, the site compound and the supervision regime.
A council asking for a tree survey will almost always want all three by the time the application is determined, with the method statement sometimes deferred to a condition to be discharged before work starts.
Registered consultants and what registration tests
The Arboricultural Association operates a registered consultant scheme, and a registration is the clearest external signal a council has. It tests the applicant's qualifications, requires sample reports to be assessed and is renewed periodically rather than held for life.
Chartered status through the Institute of Chartered Foresters is the other recognised route, and some authors hold both. Below that, the usual technical qualifications are a Level 4 arboricultural qualification or the Professional Tree Inspection certificate, with a Level 6 diploma for consultancy work.
None of these is legally required. But where a report is contested, the author's credentials go into the committee report, and an unregistered author with no stated qualification is an easy point for an objector to make. The circumstances in which a council can push back on the author are set out in when a council can reject a report because of its author.
Site supervision and the arboricultural watching brief
The method statement is worth very little if nobody checks that it is followed. BS 5837:2012 anticipates supervision, and most tree conditions now require a named arboriculturist to be appointed, to attend at specified stages and to certify compliance.
A workable watching brief specifies the trigger points rather than a vague commitment to attend. Barrier erection before any machinery arrives. The first excavation within a root protection area. Installation of any no-dig surfacing. Service trench routing. Barrier removal at the end of the build.
Records matter. Dated photographs of the barriers in position, signed site notes and a short completion statement are what discharge the condition. Authorities have refused to discharge tree conditions where the work was done properly but nothing was recorded.
Checking category assignments in a submitted survey
If you are an architect receiving a survey rather than writing one, four checks take fifteen minutes and catch most problems.
- Does the survey cover trees on adjoining land whose canopies or roots reach the site? Off-site trees constrain the layout and are frequently omitted.
- Are stem diameters recorded at 1.5 metres above ground level, with multi-stem trees calculated by the standard's method rather than by the largest stem?
- Do the category gradings match the condition text? A tree described as having extensive decay and a failed union should not be category B.
- Is there a tree constraints plan showing root protection areas and shade patterns, so the design team can see the buildable area?
Where hedgerows or groups have been recorded as single entries, check that the group boundary is drawn rather than described. A group recorded as a line on a schedule with no plan is not much use to a designer.
When a council requires a second opinion
Tree officers occasionally commission their own assessment, usually where a survey supports removal of a tree the council values, or where categories look optimistic. That is not an accusation of bad faith, and arguing about it rarely helps.
The practical response is to make the original report defensible: state the survey date and the weather, describe the inspection method as a visual assessment from ground level, say what was not inspected and why, and record any decay detection equipment used. An author who has documented their method has something to stand on. Peer review before submission costs less than the argument that follows, and what a reviewer takes on at sign-off explains what that involves.
Briefing the survey so it covers the whole red line
Most scope gaps come from the brief, not the surveyor.
Give the arboriculturist the red line boundary, the access arrangements including any temporary construction access, the drainage strategy in outline and the likely compound location. Say whether adjoining owners have given permission for access, because otherwise off-site trees will be assessed from your side of the fence and recorded with that limitation.
Ask explicitly for the tree constraints plan as a CAD layer, not just a PDF. Designers need the root protection areas in the model, and a survey delivered as a flat drawing gets redrawn badly.
An illustrative example: an architect commissioned a survey for a backland plot in April, received a schedule of 14 trees and started the layout. The survey had excluded a mature lime in the neighbouring garden whose root protection area extended 6 metres into the site, because access had not been arranged. The layout had to move the driveway and lose a parking space. Arranging neighbour access at the briefing stage would have cost nothing. This example is illustrative rather than a real case.
Councils usually expect a suitably qualified author for arboricultural work, and professional review before submission is strongly advised. If you want a reviewer to check a draft, the professional directory is the route, and understanding a consultant's scope and exclusions before signing is covered in reading a consultant fee proposal.
You can see what the tree survey and arboricultural impact assessment cover on the PlanScope tree survey page.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Who is qualified to carry out a BS 5837 tree survey?
The standard refers only to an arboriculturist with appropriate training and experience. Councils in practice look for a Level 4 arboricultural qualification or the Professional Tree Inspection certificate as a minimum, with registration through the Arboricultural Association consultant scheme or chartered status carrying most weight. None of these is a legal requirement, but an unqualified author is an easy target for objectors.
What is the difference between a tree survey and an arboricultural impact assessment?
The survey records the trees and exists independently of any design: species, dimensions, condition, remaining contribution and category. The impact assessment tests a specific layout against that survey, identifying removals, root protection area incursions and conflicts with drainage and levels. You cannot write the assessment until the layout is settled.
How is a root protection area calculated?
BS 5837:2012 uses a radius of 12 times the stem diameter measured at 1.5 metres above ground level, capped at an area of 707 square metres. Multi-stem trees are calculated by the method the standard sets out rather than from the largest stem. The resulting circle can be reshaped where soil conditions or past construction justify it, with the reasoning stated.
Do I need an arboricultural method statement?
If any retained tree is close enough to construction to be at risk, yes. It specifies barrier positions and specification, no-dig surfacing, hand-dig zones, service routing and the supervision regime. Councils often secure it by a condition to be discharged before work starts rather than requiring it with the application, but writing it early avoids a redesign at discharge stage.
What does an arboricultural watching brief involve?
A named arboriculturist attends at stated trigger points: barrier erection before machinery arrives, the first excavation inside a root protection area, no-dig surfacing installation, service trenching and barrier removal. Dated photographs, signed site notes and a completion statement are what discharge the condition, and authorities have refused discharge where the work was done but not recorded.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.