Expert Tree Removal

Preliminary Tree Assessment Reports

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Tree Reports & Assessments Sydney

Preliminary Tree Assessment Reports

Our experienced AQF Level 5 Arborist ensure you receive the best possible advice for all your arboreal reporting requirements.
A preliminary tree assessment (or pre-development tree assessment) is a comprehensive survey or assessment of trees within a designated site or parcel of land. The first stage of a preliminary tree assessment comprises numbering, tagging and collecting data for each tree within the site. The second stage of the preliminary tree assessment includes using the data collected on site in conjunction with a site survey plan to compile a report.
General information collected for each individual tree should include: a tree number, botanical name, height, canopy spread, age class, tree significance, useful life expectancy, priority for retention, trunk diameter at breast height (DBH), tree protection zone (TPZ) and structural root zone (SRZ).

The preliminary tree assessment should also include a tree location plan prepared using CAD or ArcGIS software. The tree location plan will show the number and location of each tree, the extent of the tree protection zone and should be colour coded to show the retention value for each tree (low, medium or high priority for retention).


The information contained within a preliminary tree assessment is used by planners, architects and designers, in conjunction with any planning controls and other legislation, to develop the design layout in such a way that trees selected for retention are provided with enough space to remain viable. The tree retention value will assist in prioritising which trees should be retained and protected, while the tree protection zone will provide the necessary offsets to protect those individual trees.

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