Complex: Modifications that require engineering certification and approval
The Department of Transport and Major Infrastructure (DTMI) Vehicle Safety and Standards (VSS) is required to assess applications from people wishing to perform a modification on a vehicle that requires the approval of the Chief Executive Officer (CEO) of the DTMI.
As part of this process applicants are required to complete an online application, unless the modification is one that has been gazetted as a modification not requiring formal approval or a modification that can be assessed by an Approved Inspection Station (AIS).
Complex: Engineering or modification reports, certificates and certification
Engineering and automotive consultants
The document below provides a list of persons who are recognised by the Department as able to issue engineering or modification reports or certificates for vehicles modified by themselves or under their personal supervision.
Complex: Stage 1 - Prepare to apply online
Before you can commence any complex vehicle modifications that require approval you must complete a modification application.
DTMI's Vehicle Safety and Standards section (VSS) will assess your application and advise you whether you have been granted approval in principle to proceed.
- Read the guidelines document below before completing the online light vehicle modification form. The guidelines provide you with information in respect to your proposed modifications and refer to the relevant industry bulletins for light vehicle modifications.
- Please note that you will receive a return email copy of your application once it has been submitted. If you wish to provide photographs or drawings to support your application, please send them via the email address on your response.
Complex: Stage 2 - Online application form
The Department of Transport and Major Infrastructure (DTMI) collects personal information on this form, including your name, contact details (such as phone number and email address), driver’s licence number and vehicle identifiers (such as VIN or chassis number), to assess and process your vehicle modification application. This includes applications for modifications relating to the engine and driveline, suspension, wheels and tyres, brakes, body, chassis, seating, lighting, and other vehicle modifications.
We use your personal information to assess your application and determine whether the proposed vehicle modifications meet safety and regulatory requirements, verify your identity and your connection to the vehicle, record and manage approved vehicle modifications and administer vehicle licensing records. This collection is authorised under the Road Traffic (Vehicles) Act 2012.
Providing the requested information is necessary to process your application. If you do not provide all required information, your application may not be processed. DTMI may use or disclose your personal information to authorised officers, contracted service providers, and other government agencies where necessary to assess your application, verify information, manage approvals, undertake compliance or enforcement activities, or where permitted or required by law.
DTMI will handle your personal information in accordance with the Privacy and Responsible Information Sharing Act 2024. For more information about how we handle personal information, including how to access or correct it, please visit transport.wa.gov.au/privacy.
Complex: Stage 3 - Have your online modification application processed
- Your application will be processed by VSS as soon as possible. However, you should allow a reasonable time for processing.
- In some cases you may be asked to get engineering certification approval for your proposed modifications.
Complex: Stage 4 - Once your online application has been assessed and approved in principle
- Once your application has been assessed and approved in principle by VSS, you will be issued with a letter containing a reference number.
- Once you have received this approval in principle you can commence to undertake your modifications and an automotive consultant's certification report compiled.
- Once the automotive consultant's report has been submitted to VSS, the report will be assessed and once approved, you will be issued a written approval.
Complex: Stage 5 - Complete your modifications and a vehicle inspection
- Once your modifications have been finalised and a written approval issued, you will need to undertake a vehicle inspection. Please note an inspection fee is payable.
Before you book with AIS to have your modified vehicle inspected, the following must be completed:
- You must pre-pay for the modification permit before you present the vehicle for inspection.
- You must present your receipt at the time of the inspection.
- You must present all documents, engineering certification and approval letter at the time of the inspection.
Complex: Stage 6 - You are issued with a modification permit
- If your vehicle passes the inspection and you have paid the required fee, DTMI will issue a modification permit to show that your modification has been approved by the CEO of DTMI.
- It is a requirement that you keep these documents inside the vehicle, with copies in a safe place. When your vehicle is sold they must be given to the new owner.
- It is also recommended that you discuss any modifications you have carried out or intend to make with your insurer, including those listed as modifications not requiring approval. Failure to do this could result in a subsequent insurance claim being denied.
Applicable legislation and related documents (modify a light vehicle)
Whatever the reason for a modification, the vehicle in question must conform to the following regulations and rules.
Many minor vehicle modifications can be carried out without our approval. However, they must still comply with the relevant regulations.