Welcome to TreeAZ.com

TreeAZ for planning purposes

TreeAZ is an international method of assessing the importance of trees on development sites. It is an evolution of the Safe Useful Life Expectancy (SULE) method of assessing trees developed by Jeremy Barrell in the 1980s. It is intended to help planners assign appropriate weight to trees when determining planning applications. Its basic principles are common to good tree management around the world and it can be applied internationally, with local modifications. For example, in the UK the categories are called A, B, C and R to comply with BS 5837, but the principles behind the method remained unchanged.

This website provides guidance on the use of TreeAZ for both consultants and councils in the form of downloadable PDFs that can be accessed through the buttons below.

Consultant Council