Make certain they follow ANSI A300 pruning requirements and Z133 safety requirements, indicating industry best practices.

https://charlie-wiki.win/index.php/What_to_Try_to_find_in_a_Tree_Business:_Pricing_Openness,_Equipment,_and_Tree_Trimming_Proficiency

Make sure they follow ANSI A300 pruning standards and Z133 security standards, showing market best practices.