Arboricultural qualifications and the BS 5837 author
There is no protected title in arboriculture, so anyone can put BS 5837 on a cover. Here is what the qualification levels mean and how to read a report for competence.
Who can do a BS 5837 survey is a question the standard answers loosely and the market answers badly. BS 5837:2012 asks for an arboriculturist, meaning a person who has gained expertise in trees in relation to construction through relevant education, training and experience. There is no statutory register, no protected title and no legal barrier to anyone producing a document with BS 5837 on the cover. A chainsaw certificate is a qualification to fell a tree, not to advise on whether one can be retained beside a new foundation.
The consequence is a wide spread of quality in what councils receive, and a tree officer who has read a few hundred of these documents can usually tell within a page.
What the standard expects of the surveyor
BS 5837:2012 sets out a sequence rather than a single deliverable. Survey the trees and record them to a defined schedule. Categorise them by quality and value. Calculate root protection areas. Produce a tree constraints plan. Then, once a layout exists, assess the impact of the proposal, specify protection and write a method statement for the construction interface.
Those are different skills. Recording stem diameter, crown spread and physiological condition is a technician's task done to a standard. Deciding whether a category B oak can be retained 4 metres from a new terrace, and what that requires of the foundation design, drainage layout and construction access, is a judgement that needs experience of buildings as well as trees.
The standard's own language reflects that. It refers to the arboriculturist working with the design team from the earliest stage, which is only possible for someone who can read a drainage drawing and hold a conversation about level changes.
Qualification levels in arboriculture
The qualification framework runs from operational certificates through technician-level awards to degree-level study, and the levels carry real weight here.
| Level | What it typically covers |
|---|---|
| Level 2 and 3 certificates and diplomas | Tree biology, identification, basic inspection, operational practice |
| Level 4 Technician's Certificate in Arboriculture | Inspection, hazard assessment, tree management, the standard's survey methodology |
| Level 6 Professional Diploma in Arboriculture | Consultancy practice, planning and legal context, impact assessment, report writing |
| Level 7 and degree-level study | Research methods, specialist subjects such as soil science or tree biomechanics |
For a straightforward survey and constraints plan, a Level 4 technician qualification with site experience is a reasonable expectation. For an impact assessment and method statement on a constrained site, the Level 6 diploma or an equivalent degree with consultancy experience is what a tree officer will look for, because that is where the planning and legal context is taught.
Operational certificates for chainsaw use, aerial rescue and climbing are separate and they are not consultancy qualifications. A contractor with both sets is useful. A contractor with only the operational set, writing a method statement, is a risk.
Registration routes and what each signals
Membership of the Arboricultural Association at Technician or Professional grade tells you the qualification and experience have been assessed by someone other than the person's own website. The Association also runs a registered consultant scheme, which involves a submission of work for peer assessment and is the strongest single signal available in this field.
Chartered status through the Institute of Chartered Foresters, with arboriculture as the chosen route, is the other recognised professional endorsement, and it carries a continuing professional development requirement and a code of conduct.
None of these is a legal requirement. What they give you is a complaints route, an indemnity expectation and evidence you can put in front of a case officer who asks about the author's competence. Our note on comparing fee quotes for the same specialist report covers how to compare submissions when one bidder holds a registration and another does not.
Survey competence against impact assessment competence
This is the distinction that matters most in practice, and it is where fee comparisons mislead.
A tree survey prepared to BS 5837 is a recording exercise with a defined output. Tree number, species, stem diameter at 1.5 m, height, crown spread by cardinal point, height of crown clearance, age class, physiological and structural condition, preliminary management recommendations, estimated remaining contribution in years, and a category of U, A, B or C with subcategories. It is repeatable, and two competent surveyors should broadly agree.
An arboricultural impact assessment is an argument. It takes the layout and says which trees are lost, which are affected, whether the losses are acceptable in policy terms, what mitigation is proposed and how construction will be managed. Two competent arboriculturists can reach different conclusions on the same site, and the quality of the reasoning is what carries the case.
So do not buy them as one commodity. Where a scheme has a mature tree close to the development footprint, pay for the judgement rather than for the schedule.
Equipment, access and the limits of a ground inspection
Most BS 5837 surveys are ground-based visual assessments, and that is appropriate for the purpose. Say so in the report. Where decay is suspected, further investigation may involve decay detection equipment or a climbing inspection, and a climbing inspection brings work at height obligations that a sole practitioner may not be equipped for.
Access limitations are worth recording honestly. Trees on third-party land measured from over a fence, crowns estimated rather than measured, stems obscured by ivy, and root protection areas drawn without the ability to confirm ground conditions are all common and all acceptable if stated. A report that presents estimated data as measured data is a problem, because the root protection area calculated from an estimated stem diameter is an estimate too.
Season matters less than people assume for survey purposes, since stem diameter and structural condition can be assessed in winter. It matters for physiological condition, foliage assessment and for identifying some species, so a winter survey should say what it could not assess and whether a summer check is recommended.
Reading a report for competence signals
A quick review of an incoming report. Does the schedule carry every field the standard asks for, or has the author dropped crown clearance and remaining contribution? Are root protection areas shown as modified shapes where buildings and roads clearly exclude rooting, or as unmodified circles everywhere? Is there a tree constraints plan distinct from the tree protection plan, and does it show shade patterns as well as canopy? Are category U trees identified as such, rather than every tree being a B to avoid argument?
Then the ones that reveal most. Does the method statement name actual construction operations on this site, or is it generic text that would suit any plot? Does the author state the date of the survey and its validity period, since a survey more than about two years old will usually be challenged? And has anyone signed it, with a qualification after their name?
Our note on briefing a specialist when the site data is incomplete covers what to send at instruction, which has a direct bearing on how useful the output is.
Instructing to the right scope
Break the instruction into stages and price them separately.
- Survey, categorisation, root protection areas and tree constraints plan, before the layout is drawn.
- Design input during layout development, charged as time rather than as a deliverable.
- Arboricultural impact assessment against the submission layout, with mitigation and replacement planting proposals.
- Tree protection plan and arboricultural method statement for the pre-commencement condition.
- Site supervision at defined hold points during construction, with written records.
The mistake is commissioning stage one and stage three together, after the layout is fixed, then discovering that the layout cannot be protected. Stage two is the least costly stage in the sequence and the one most often omitted.
Where the arboriculturist is appointed through the architect rather than directly, settle the liability position in writing. Our note on sub-consultants and who carries the liability sets out the questions to ask. If you want a reviewer to sign off a draft rather than to produce the whole document, the professional review route is the mechanism.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified arboriculturist 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. An Arboricultural Impact Assessment is a report type where councils expect a suitably qualified author, so professional review is strongly advised.
Browse the report types on PlanScope to see where the tree documents sit in a submission.
Frequently asked questions
Does BS 5837 say who can carry out the survey?
Only loosely. The standard asks for an arboriculturist, meaning someone who has gained expertise in trees in relation to construction through relevant education, training and experience. There is no statutory register and no protected title, so the competence question falls to the client and the local planning authority to judge from the qualifications and the work.
Is a chainsaw certificate enough to write a tree report?
No. Operational certificates for chainsaw use, climbing and aerial rescue qualify someone to carry out tree work safely. They do not cover survey methodology, planning policy, impact assessment or construction interfaces. A contractor holding both operational and consultancy qualifications is useful; one holding only the operational set is a risk on a method statement.
What qualification level should the author hold?
For a survey, categorisation and constraints plan, a Level 4 Technician's Certificate in Arboriculture with site experience is a reasonable expectation. For an impact assessment and method statement on a constrained site, look for the Level 6 Professional Diploma or an equivalent degree, because that is where planning and legal context is taught.
What is the difference between a tree survey and an impact assessment?
A survey is a recording exercise with a defined schedule, and two competent surveyors should broadly agree on the output. An impact assessment is an argument about which trees are lost, whether that is acceptable in policy terms and how construction will be managed. Two competent arboriculturists can reach different conclusions on the same site.
How old can a tree survey be before it is challenged?
A survey more than about two years old will usually be questioned, because condition, crown spread and management needs change. The report should state the survey date and a validity period. A winter survey should also say what it could not assess, such as foliage condition and some species identification, and whether a summer check is recommended.
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.