Heavy vehicle modifications

Modified heavy vehicles may be registered in the Northern Territory (NT) provided they conform to safety standards and are approved by the MVR.

When modifying a heavy vehicle you should consider:

• the manufacturer's guidelines on vehicle modification techniques
• the Heavy Vehicle Modifications Code of Practice on the National Heavy Vehicle Regulator website.

If you have modified your heavy vehicle, it may have to be assessed by the MVR.

Before you apply

You will need to supply all of the following:

• vehicle details such as month and year of vehicle manufacture
• additional information that will help in the assessment of your vehicle such as:
• photos or sketches
• certification documents such as engineering approval.
• a signed representative authorisation form, or similar level of authorisation evidence, such as an email or letter, if applying on behalf of the vehicle owner.

Download the representative authorisation form:

Authorise a representative to modify a vehicle PDF (128.1 KB)
Authorise a representative to modify a vehicle DOCX (63.2 KB).

Apply online

You can apply online to get approval for modifications.

Go to Territory Services

Other ways to apply

To apply by email, mail or in person, you must supply the above details and a completed application to modify a vehicle PDF (245.3 KB).

You will be notified in writing about the outcome of the assessment.

By mail or email

Send to:
Vehicle standards officer
Department of Logistics and Infrastructure
GPO Box 2520
Darwin NT 0801

Email: vehiclestandards.mvr@nt.gov.au 

In person

You can submit your application at an MVR office.

More information

For more information, get the heavy vehicle modifications information bulletin PDF (1.3 MB).