Arboriculturist competence for a BS 5837 tree survey
BS 5837 assumes the survey is done by an arboriculturist with relevant education, training and experience. Councils increasingly test that assumption rather than take it on trust.
BS 5837:2012 assumes that the tree survey underpinning a planning application is carried out by an arboriculturist: someone who through education, training and experience has gained expertise in the care of trees. It does not name a qualification, and there is no statutory register. So councils fall back on validation wording requiring a suitably qualified arboriculturist, and on whether the report itself demonstrates competence.
A survey that does not show its working is the one that gets sent back, whoever signed it.
What BS 5837 asks of the surveyor
The standard sets out a sequence: survey the trees, categorise them, calculate root protection areas, assess the effect of the proposal, and specify protection and any method statement needed for works within protected areas.
Each stage needs judgement. Categorisation places trees in category U for those that should be removed regardless of the development, and categories A, B and C for retention value in descending order, with sub-categories for arboricultural, landscape and cultural value. Assigning a category means assessing condition, life expectancy, form and contribution, and defending the result.
Root protection areas are calculated from stem diameter, with an area cap for the largest trees, and adjusted in shape where soil conditions or existing structures make the default circle unrealistic. That adjustment is where inexperienced surveyors either apply the default blindly or reshape the area to suit the layout.
The standard also expects the arboriculturist to be involved in the design process rather than to report on a finished layout. That is the part clients most often skip, and it is why so many schemes carry an unresolvable tree conflict into determination.
Qualifications and registers councils recognise
There is no licence, so competence is evidenced by qualification, membership and experience together.
Vocational qualifications in arboriculture run from technician level through to professional diploma level, and the higher qualifications cover survey, assessment and report writing rather than tree work operations. A certificate in chainsaw operation is not a survey qualification, and reports written by contractors on that basis are a recurring problem.
Professional membership sits with the Arboricultural Association, which operates graded membership and a registered consultant scheme with an assessment process. Chartered status in arboriculture is available through the Institute of Chartered Foresters. Either is a reasonable filter.
Tree condition assessment methods such as those used for detailed decay evaluation are separate specialisms with their own training, and a survey for planning does not usually require them.
Ask three things before appointing: which qualifications the surveyor holds, whether they are a registered consultant or chartered, and for two recent BS 5837 reports accepted by named local planning authorities. A surveyor who cannot produce the last of those is not ready for a planning submission.
Survey scope and what a council will accept
Validation lists usually require the survey to cover trees on the site and trees on adjoining land whose root protection areas or canopies extend onto it. That second part is frequently missed, and it produces an invalid application.
A survey a council will accept includes a schedule with, for each tree: reference number, species, height, stem diameter at the standard measurement height, branch spread in four directions, crown clearance, age class, physiological and structural condition, estimated remaining contribution, category and sub-category, and the calculated root protection area.
It also includes a tree constraints plan showing the root protection areas and shade patterns over the topographical survey, and, once a layout exists, an arboricultural impact assessment, a tree protection plan and an arboricultural method statement for any works within a protection area.
The tree survey and arboricultural impact assessment page sets out what the assessment covers. A survey that stops at the schedule and omits the constraints plan is only half the document, and it will not support a design.
Where non-specialist tree reports fail
The failure patterns are consistent enough to use as a review checklist.
- Stem diameters estimated rather than measured, so every root protection area is wrong.
- No root protection areas calculated at all, only canopy spreads shown.
- Categories assigned with no condition information to support them, or every tree placed in category C to make removal easier.
- Trees on adjoining land omitted.
- The survey carried out from outside the site, over a fence, with no access.
- No tree protection plan, or a plan showing fencing that the construction sequence makes impossible.
- A method statement that says works will be carried out under arboricultural supervision without saying what the works are.
Point three is worth dwelling on. Councils read a survey where every tree is category C as advocacy rather than assessment, and once that impression forms, the whole report is discounted.
Point five is checkable from the photographs. If every image is taken from the same angle at the boundary, the surveyor did not walk the site.
Coordinating the surveyor with the designer
The efficient sequence puts the survey first and the layout second.
Commission the topographical survey and the tree survey together, so the trees are plotted accurately with their crown spreads. Have the arboriculturist produce the tree constraints plan before the architect draws anything. Then design within the constraints, and bring the arboriculturist back to test the layout and write the impact assessment.
Where a conflict is unavoidable, resolve it at design stage. Options include shifting the footprint, using a no-dig construction for hard surfaces within a protection area, cantilevering a structure over roots, or accepting the removal of a lower category tree with replacement planting.
The expensive alternative is a finished layout that requires the removal of a category A tree, discovered at validation. At that point the choice is redesign or a refusal, and both cost more than the survey would have.
For sites with a landscape requirement, coordinate the tree work with the landscape strategy so retained trees, replacement planting and canopy targets are consistent across the drawings.
Reviewing a tree report before submission
Read the report as a case officer would, with four questions.
Does the schedule contain measured stem diameters and calculated root protection areas for every tree, including those on adjoining land? Are the categories supported by the condition information in the same row? Does the tree protection plan show fencing that could actually be installed and maintained given the construction access? And does the method statement describe specific works with specific methods and a named supervisor?
Then check consistency across the pack. Tree positions on the arboricultural drawings should match the topographical survey and the site layout, and any tree shown as retained should not have a building foundation drawn through its protection area.
Councils expect a suitably qualified author for arboricultural work, and professional review is strongly advised before submission. A draft can be prepared and then sent through the professional review route for a suitably qualified reviewer to check and sign off.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
Who can carry out a BS 5837 tree survey?
An arboriculturist with relevant education, training and experience. There is no statutory register or licence, so competence is evidenced by a survey-level qualification in arboriculture, membership of the Arboricultural Association or chartered status through the Institute of Chartered Foresters, and a record of reports accepted by local planning authorities.
Is a tree surgeon qualified to write a planning tree report?
Not on the basis of chainsaw and tree work certificates alone, which cover operations rather than survey and assessment. Some tree surgeons also hold survey-level arboricultural qualifications and are perfectly capable. Ask what qualifications the person signing the report holds and for two recent reports accepted by named councils.
Do neighbouring trees have to be surveyed?
Yes, where their root protection areas or canopies extend onto the application site. Validation lists routinely require it, and omitting them is a common reason an application is not validated. Survey them from your own land or with the neighbour's permission, and plot their protection areas on the constraints plan.
When should the tree survey be done?
Before the layout is drawn. The survey and the tree constraints plan should inform the design, which is what BS 5837 assumes. Commissioning it after the drawings are complete leaves only two options where a conflict arises: redesign or a refusal, both of which cost more than the survey itself.
What makes a council reject a tree report?
Estimated rather than measured stem diameters, missing root protection area calculations, categories with no supporting condition information, omitted neighbouring trees, a survey clearly carried out from outside the site, no tree protection plan, or a method statement with no specific works or named supervisor.
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.