Arboricultural Impact Assessment (AIA)
An arboricultural impact assessment is often a mandatory requirement before a development application can be approved. Whether you are a builder, developer, architect or private landowner, getting the right report prepared by a qualified arborist early in the process can save significant time and cost down the track.
At Asset Tree Care, we prepare professional AIA reports for development applications across Mandurah, Perth and surrounding local government areas. Our assessments are compliant with AS 4970-2025 and are prepared to meet the requirements of councils and planning authorities throughout the region.
What Is an Arboricultural Impact Assessment?
An arboricultural impact assessment is a formal report prepared by a qualified arborist that evaluates the potential impact of a proposed development on trees located on or adjacent to a development site. It is commonly required as part of a development application where regulated, significant or other protected trees are present.
The assessment considers which trees will be directly or indirectly affected by the proposed works, and sets out measures to minimise impacts and protect trees during construction. Where removal is proposed, the report provides the arboricultural justification councils need to assess the application.
At Asset Tree Care, we prepare arboricultural impact assessments for residential developments, commercial projects and subdivisions throughout Mandurah, Perth and surrounding local government areas. Our reports are designed to meet council requirements while providing practical guidance that supports the planning process.
Working With Designers and Architects
The earlier an arborist is involved in the design process, the better the outcome for everyone involved. We regularly work alongside architects, builders, developers, draftspeople and project managers to identify tree constraints before plans are finalised, helping reduce redesigns, delays and unnecessary costs later in the approval process.
Tree Protection Zones (TPZs), Structural Root Zones (SRZs) and other site constraints can significantly influence where buildings, services, footings and hardstand areas can be located. Identifying these constraints early allows design teams to develop practical solutions that protect important trees while supporting the project’s planning objectives.
We can engage directly with your design team throughout the planning process, providing clear arboricultural advice that integrates with site plans and development documentation. Where designs change, we can reassess the proposal and update the report to reflect revised plans.
Formal assessments for trees meeting regulated size thresholds under local council planning policy.
Safe, efficient removal of unwanted or hazardous trees using modern climbing and rigging methods.
“Hamish and his team did a fabulous job removing some trees in our yard, including a very large and challenging tree. They were friendly, helpful, and thorough. Communication was always very prompt. We were very pleased with what a great job they did and how tidy they left the yard after they had completed the job. We would highly recommend them to anyone needing tree pruning or removal.”
Sydney Roberts
Tree Removal
Frequently Asked Questions
An arboricultural impact assessment is a report prepared by a qualified arborist that evaluates how a proposed development will affect trees on or near a site. It is commonly required as part of a development application and sets out measures to protect trees during construction or justification for their removal.
You will generally need an AIA report when your development application involves works near regulated, significant or protected trees.
This includes
- new builds
- extensions
- subdivisions
- commercial developments
Trees on or adjacent to the site may be affected by excavation, building footprints, service trenching or changes to ground levels.
The Structural Root Zone (SRZ) is the area around the base of a tree that must be protected to maintain its structural stability. The No Root Zone (NRZ) is a smaller inner zone where root disturbance would cause unacceptable damage to the tree. These calculations are a standard part of any AIA prepared under AS 4970-2025 and are used to determine where construction activity can and cannot occur near retained trees.
AS 4970-2025 is the Australian Standard for the protection of trees on development sites. It sets out the methodology arborists must follow when assessing tree impacts during development, including how to calculate protection zones and what tree protection measures should be implemented on site. Our reports are prepared in compliance with this standard.
Yes. We regularly collaborate with architects, draftspeople, builders and project managers throughout the assessment and design process. Early arborist involvement helps avoid design conflicts and keeps development applications on track.
We prepare arboricultural impact assessment reports across Mandurah, Rockingham, Kwinana, Murray, Waroona and surrounding areas throughout the Peel region and Perth metropolitan area.
Ready To Get Started?
Need a compliant arborist report for your development application? Contact Asset Tree Care today for professional, accurate arboricultural impact assessments across Mandurah, Perth and surrounding LGAs.
Call Hamish on 0490 762 201
Or Request Your Free Consultation
Asset Tree Care | Mandurah’s trusted arboricultural specialists.
Fully qualified. Fully insured. Always reliable.