Arboricultural Impact Assessments (AIA): What They Are and Why They Matter
Arboricultural Impact Assessments (AIAs) are an essential part of responsible development planning. If your project involves trees—especially in urban or environmentally sensitive areas—an AIA ensures that the proposed works do not compromise tree health or breach local council regulations.
At Arboriculture Victoria, we provide comprehensive AIA reports in line with AS 4970-2009 – Protection of Trees on Development Sites, ensuring your project remains compliant while safeguarding Melbourne’s urban forest.
📝 What Is an Arboricultural Impact Assessment?
An Arboricultural Impact Assessment is a detailed report prepared by a consulting arborist that evaluates how a proposed development will affect trees on and around a site. It forms a critical part of the planning permit process for many councils across Melbourne and greater Victoria.
The report identifies:
All trees on-site and within proximity (typically within 10–15m)
The Tree Protection Zones (TPZs) and Structural Root Zones (SRZs)
The likely impact of construction activities on tree health
Recommendations for tree retention, protection, or removal
Guidelines for ongoing site supervision and compliance
Need help with your site? Learn more about our Project Arborist Services for on-site supervision and compliance monitoring.
🛠️ Why Are AIAs Important?
AIAs are important because they:
Protect valuable trees during construction and development
Help avoid fines or delays from non-compliance with council regulations
Inform architects, builders, and planners of realistic constraints
Ensure that development works are carried out safely and sustainably
Support planning permit approval by addressing arboricultural concerns
They are particularly important in areas where vegetation is protected under planning overlays or where Tree Protection Local Laws apply, such as those in Moreland (Merri-bek), Banyule, and Boroondara councils.
If you’re unsure whether your site needs an AIA, we recommend reviewing your local regulations or contacting us directly.
🌱 What’s Included in an AIA?
A professionally prepared AIA from Arboriculture Victoria typically includes:
Tree Identification & Data Collection
We assess tree species, height, trunk diameter, health, structure, and retention value.
Mapping TPZs and SRZs
We calculate the Tree Protection Zone (TPZ) and Structural Root Zone (SRZ) for each tree and overlay them on your site plans.
Learn more about how root plates and TPZs are determined.
Impact Assessment
We determine how proposed construction, excavation, services, or access may affect tree health and stability.
Protection Measures
The report outlines specific tree protection requirements, fencing, pruning guidelines, and any design changes needed to reduce harm.
Ongoing Monitoring Recommendations
For sensitive projects, we recommend engaging a project arborist to supervise works within TPZs—see our Tree Protection Management Plans.
🏗️ When Do You Need an AIA?
You’ll typically need an AIA when:
Applying for a planning permit
Undertaking subdivision or infill development
Building within the canopy or root zone of a protected tree
Modifying land with protected vegetation overlays
Removing or pruning regulated trees
Most local councils in Melbourne now require an AIA as part of the planning application if trees may be impacted. Early engagement of a qualified consulting arborist can save you time, money, and stress.
✅ Choose Arboriculture Victoria for Your AIA
At Arboriculture Victoria, we deliver AIAs tailored to local council requirements and development needs. Our assessments are clear, compliant, and prepared by experienced, VALID-certified arborists. We serve Melbourne and regional Victoria, offering a full suite of arborist reports and support.
Ready to get started? Learn more about our full Arboricultural Impact Assessments (AIA) service, or request a quote today.
📌 Related Services
Tree Health & Risk Assessments – Comprehensive inspection of structural and biological risks.
Urban Tree Management – Long-term tree care planning across councils and developments.
Tree Protection Management Plans – Required for ongoing works within TPZs.
