Modified Vehicle Approval WA
Western Australia approves modified vehicles through its own Department of Transport process, typically involving an automotive consultant and a vehicle examination. Interstate engineering certificates do not remove the need for WA's own approval.
- Scheme
- Department of Transport vehicle examination and approval
- Who certifies
- Automotive consultant
- Authority
- Department of Transport
- Validity
- Vehicle examination recorded permanently
- Plate / record
- Permit or approval recorded against the vehicle after examination
WA runs its own process
Unlike states that delegate certification to licensed private signatories, Western Australia keeps approval within the Department of Transport, typically involving an automotive consultant and a physical vehicle examination.
The practical consequence: an interstate certificate is supporting evidence, not a substitute. Plan for a WA examination even if the car arrives fully engineered.
What to bring to an examination
Examinations go faster when the evidence is complete: the original interstate certificate if one exists, parts specifications and compliance documents, staged photographs of the work, and receipts identifying who performed it. Turning up with the car and nothing else is what turns one appointment into three.
Sources and verification
This page summarises the Department of Transport vehicle examination and approval as administered by Department of Transport. It is a summary, not the instrument itself. Requirements change, and they are applied at the discretion of the authority and the certifier assessing your vehicle.
- Road Traffic (Vehicles) Regulations 2014 (WA)
- Vehicle modifications and standards — Department of Transport (WA)
- Official Department of Transport information
Before you start work, confirm your specific situation with Department of Transport or a Automotive consultant. Do not rely on this page alone to decide whether a modification is legal.
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Frequently asked questions
Do I need a new approval in WA if my car is already engineered interstate?
Generally yes. WA requires its own approval process even where an interstate certificate exists, though the existing documentation helps.
Keep reading
Current as at 2026-08-24. Reviewed every 90 days; next review due 2026-11-22. This guide is general information for Australian vehicle owners, not legal or engineering advice. Requirements change and are applied at the discretion of your state authority. Always confirm with your road authority or a licensed certifier before starting work.