Insurance, Qualifications & Accreditation

Qualifications and training

We take our work very seriously and continual professional development is fundamental to our ethos. As the lead climber Mark has the following NPTC chainsaw qualifications:

  • Certified Arborist
  • CS30 Basic chainsaw maintenance and cross cutting.
  • CS31 Felling small trees.
  • CS32 Felling medium Trees.
  • CS34 Dealing with windblown trees.
  • CS38 Climbing with a rope and harness and aerial rescue.
  • CS39 Use of a chainsaw from a rope and harness.
  • CS41 Rigging and sectional felling.
  • CS40 Carry out aerial pruning of a tree.
  • CS47 Use of chainsaw from a MEWP (cherry picker).
  • CS50 Dealing with storm damaged trees.
  • Professional Tree Inspection


ISA certified arborist
ARB approved contractor


As Arboricultural Association Approved Contractors, we can assure that our customers will receive a first class service carried out by fully qualified and insured arborists trained to work to the highest safety levels. This is crucial when carrying out any tree work as poor arboriculture can lead to property damage, serious injury or, indeed, death and ultimately serious damage to the health and life span of your tree(s). Information can be found at:

Unfortunately, the tree surgery industry has its fair share of rogues who are neither qualified nor insured. TrunkArb is fully insured to cover all tree surgery operations and associated operations to £5m. We are also NPTC qualified for the operations that we offer.

As a progressive company that believe in continual improvement, Mark ensures that he can offer you the best service by academic study as well practical skills qualifications. Mark is an ISA ‘Certified Arborist’. Below is an extract from the ISA’s press release:

“Mark Harris of Woolaston, Lydney recently demonstrated professional competency by successfully completing the CERTIFIED ARBORIST examination administered through the International Society of Arboriculture (ISA) and the UK and Ireland Chapter of the ISA.

The purpose of the Certification Program is to improve the level of knowledge and standard of practice within the tree care profession. It is designed to assist the public in identifying those professionals in arboriculture who have demonstrated, through a professionally developed examination and education program, a thorough knowledge of tree care practices.

The ISA is a scientific and educational organisation devoted to the dissemination of information in the care and preservation of trees. The ISA’s certification Program is designed to promote the professional development of those involved in the field of arboriculture or tree care.”

Leaving you safe in the knowledge that you will get work of the highest standard and that your property will be covered if the unlikely or unexpected happens

BS3998. – All our work is conduct in accordance with the British Standard Tree Work Recommendations and industry best practice.

TPOs, Conservation areas and planning applications. – In the event that your trees are in a conservation area or have a tree preservation order on them, we will confirm the tree status with the local authority, and if required, undertake the planning application to conduct the works. Should you choose to undertake your own planning application we can offer advice and guidance as you complete your application.

TrunkArb understands that having any work done in your garden is a large undertaking and that tree work has many risks associated with it. We therefore recommend that you only consider using contractors that are fully insured. We have Public liability insurance to cover to £5,000,000, and we will ensure that our insurance certificate is available for you to check on request, if you have not had the opportunity to see it during the quoting process. So you can use TrunkArb, safe in the knowledge that if the unexpected happens, we have it covered.