Accredited for our high standards of Health & Safety, Work Quality & Environmental Management, TreeWorks are approved contractors and professional members of the Arboricultural Association and Consulting Arborists Society, and are amongst the most qualified and experienced in the UK.

Accreditations for Work Quality, Health & Safety Management and Environmental Consideration provide you with peace of mind and give us a real sense of achievement.


The Arboricultural Association

The objectives of the Arboricultural Association are to advance the study of Arboriculture, raise the standards of practice, foster interest in trees through publications, exhibitions and the stimulation of research or experiment, and to assist in the training of students in disciplines where arboriculture is a major subject.



Constructionline is the UK's leading procurement and supply chain management service that collects, assesses and monitors standard company information through a question set that is aligned to PAS 91, the standardised pre-qualification questionnaire developed by BSI to reduce duplication within the construction industry.



Licensed by Government and supported by consumer protection groups TrustMark gives consumers confidence in their tradesman. TreeWorks has signed up to the scheme and has been independently assessed for competence and is approved to carry the TrustMark logo. TrustMark operators are audited annually, to ensure processes, standards and complaint procedures are being maintained.


The Consulting Arborist Society

CAS represents professional tree specialists, or arboricultural consultants, with extensive knowledge, experience and skills

As an ISO 9001 certified organisation TreeWorks has implemented quality management system requirements for all areas of the business including: Facilities, People, Training, Services & Equipment.

The ISO 14001 standard represents the core set of standards used by organizations to promote more effective and efficient environmental management systems.

ISO 45001 is an ISO standard for management systems of occupational health and safety (OH&S), published in March 2018. The goal of ISO 45001 is the reduction of occupational injuries and diseases.