Welcome to CAS

Consulting Arborist Society members are here to help with tree problems and reports.

Meet the

The Consulting Arborist Society represents tree specialists (sometimes called arboricultural consultants) from a range of backgrounds. Some have decades of practical experience as arborists undertaking tree work. Some are Arboricultural Association Registered Consultants. Many are Professional Members of the Arboricultural Association. All are tree specialists who practice tree care and have been accredited for the specific skills they are promoted for under in our directory.

who we are

The Consulting Arborist Societies was formed in 2023 from the Arboriculture Mortgage Insurance Users Group (AMIUG) as a vehicle by which consultants accredited to this could promote their services.

Since then, it has expanded to recognise eight areas of Professional Competency.

join us


£80.00 + VAT

Payment Options


£125.00 + VAT

Payment Options

Your Questions Answered

Yes! Providing the accreditation is comparable to the CAS course, it is transferable.

Prospective members are required to have a minimum of four years of relevant industry experience, of which at least one year needs to be in a role providing advice. This could be working as a tree officer, or leading tree works operations where you are advising clients. If in doubt, please ask. We also require that you hold a recognised qualification in arboriculture to QCF level four or above. This can include the AA Technician’s Certificate, or a Foundation degree. If you do not have such a qualification, we simply ask that you be willing take this within five years of joining.

CAS recognises eight Areas of Professional Competency. You need to be accredited to at least one of these. You also need to have Professional Indemnity Insurance to at least £500,000 (and preferably £1,000,000).

Yes. Whilst industry experience is valuable and important, the accreditation means that you can demonstrate you have been independently assessed to the relevant industry standard.


  • Mortgage & Insurance Reports (both courses run by CASand by Myerscough College are recognised)
  • BS5837:2012 Trees in Relation to Design, Demolition and Construction: Recommendations. By peer review
  • Lantra Professional Tree Inspector
  • Tree Preservation Orders: Effectively Administration.
  • Amenity Tree Valuations
  • Expert Witness
  • Quantified Tree Risk Assessment
  • Young Trees: Achieving Longevity in the Landscape

Yes! It is not the value of the commission but the potential scale of the claim that you are insuring against. It is important that all CASProfessional Members are properly insured.


You get to use the CAS logo, a listing on the CAS site for each of the APCs you are accredited for, the member discount for all CAScourses and, of course, full access to the CAS magazine site.


No. You as an individual are the member, not your company or employer.

Yes! We include a strong search engine optimised link to your website from the CAS directory.

No! As you will not be practicing as a consultant under the CAS banner, these are not requirements.

There can be a great variation in the standard of these reports, and many do not meet the requirements of the British Standard. By submitting a sample report for peer review, when it is successful, you can demonstrate that you have an acceptable template.


No. Indeed, CAS recognises that whilst some consultants provide a wide range of services, others specialise.

You can pay by annual cheque (£125 + VAT), annual standing order (£115 + VAT) or monthly standing order (£10 + VAT).

Trusted Partnerships