There are several types of arborist reports and the type you need depends on your circumstances.
Tree inventories are reports that identify trees, usually protected trees, on or near a specific lot. Typically such trees are identified on a survey. Tree inventories identify a tree by number, and include species, size, and condition. Various municipalities may require additional information such as the by-law under which a tree may be protected, or a tree’s value.
Tree assessments are reports that detail the species, size, health and structure of a tree. Tree assessments are typically required by municipalities as part of an application for a permit to injure or remove a protected tree.
Tree valuations are reports that detail the approximate dollar value of a tree. Tree valuations are normally required in insurance or court cases where trees have been injured or removed without the owner’s consent. Tree valuation reports may also be required by a municipality for construction areas where protected trees are located.
Tree preservation plans are reports usually required by municipalities and created by arborists for the purpose of preserving trees during development or construction activities. Tree preservation plans include tree inventories, assessments and sometimes valuations. Tree preservation plans identify all protected trees on the affected site, outline trees to be removed and trees to be retained, and detail the measures to be implemented during the construction process that will ensure the preservation of appropriate trees.