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Consulting Arborist
specialist
When you need one
Trees near proposed construction, tree removal requests, Council tree register items.
Qualifications
AQF Level 5 Consulting Arborist (Diploma of Arboriculture).
Professional body
Arboriculture Australia
Typical cost (Arboricultural Impact Assessment Report (AS 4970))
A$700–4,500
Per-state notes
AS 4970-2009 Tree Protection on Development Sites is the national standard. SULE = Safe Useful Life Expectancy (1-40 years).
Key outputs
- ✓Tree schedule (species, DBH, height, canopy, SULE)
- ✓Tree Protection Zone (TPZ) per AS 4970
- ✓Structural Root Zone (SRZ)
- ✓Encroachment % (under 10% generally acceptable)
- ✓Retention vs removal recommendations
- ✓Tree protection measures during construction
- ✓Replacement planting schedule
What triggers engaging them
- ▸Trees with DBH > 250mm typically
- ▸Council Tree Register listed
- ▸Significant trees within TPZ of proposed building
- ▸Tree removal request
Notes
TPZ encroachment > 10% usually requires significant design revision OR engineered foundations (pier-and-beam) to avoid root damage.