Car Modification Laws in Australia 2025: What’s Legal & What’s Not

Modifying your car is a cornerstone of automotive culture in Australia. From performance upgrades to aesthetic enhancements, enthusiasts continuously seek ways to personalise and improve their vehicles. However, Australian modification laws are stringent, varying significantly between states and territories. To avoid fines, defect notices, or worse—vehicle impounding—it's crucial to understand what's allowed in your region.

In this guide, we'll clarify car modification laws across Australia for 2025, breaking down what's permitted, what's prohibited, and highlighting notable differences state-by-state.

Common Car Modifications & Their Legality (Australia-wide)

First, let’s quickly review popular car modifications and their general legality:

• Coilovers & Lowering Springs: Legal with certain height restrictions.
• Lift Kits: Legal with height restrictions varying by state.
• Turbochargers & Superchargers: Legal but require engineering certification.
• Exhaust Systems: Legal with noise level compliance.
• Wheels & Tyres: Legal if within size specifications.
• Window Tint: Legal within specific transparency limits.
• LED & HID Headlights: Legal, but must comply with ADR (Australian Design Rules).
• Aftermarket Steering Wheels & Seats: Legal with ADR compliance and correct installation.
• Engine Swaps: Legal with engineering certification and emissions compliance.

State-by-State Modification Laws (Detailed)

Here's how car modification laws vary across states in Australia:

New South Wales (NSW)

• Suspension: Vehicles may be lowered or raised up to 50mm without certification. Beyond this requires an engineering certificate.
• Wheels/Tyres: Width and diameter must be within 25mm of manufacturer specifications.
• Exhaust: Noise limits strictly enforced (typically 90 dB for passenger vehicles).

Victoria (VIC)

• Lift Kits/Lowering: Maximum 50mm height variation without approval.
• Engine Modifications: Turbocharger or supercharger installations always require VASS (Vehicle Assessment Signatory Scheme) approval.
• Lighting: Aftermarket headlights must meet ADR compliance.

Queensland (QLD)

• Suspension: Up to 75mm lift permitted with certification. Up to 50mm without.
• Turbocharging: Requires certification and emissions compliance.
• Window Tint: Front side windows must allow 35% VLT (Visible Light Transmission); rear windows allow darker tints.

South Australia (SA)

• Exhaust: Modified exhausts must pass noise and emissions tests.
• Suspension: Maximum lift/lowering of 50mm without inspection; beyond requires an inspection and approval.

Western Australia (WA)

• Suspension Lift: 50mm allowed without certification; 150mm maximum with engineering approval.
• Tyres: Diameter must not exceed 50mm above original tyre specifications without approval.

Tasmania (TAS)

• Lift/Lowering: Vehicle height modifications require inspection if exceeding 50mm.
• Exhaust Systems: Compliance with ADR noise limits required; typically 90 dB limit.

Australian Capital Territory (ACT)

• Suspension: Requires certification for lifts/lowers beyond 50mm.
• Window Tint: Similar rules as NSW/QLD with 35% VLT minimum on front windows.

Northern Territory (NT)

• Lift Kits: Allowable 50mm without engineering; beyond needs inspection.
• Turbo & Engine Mods: Engineering certificate required for performance enhancements.

Understanding ADR Compliance & Engineering Certificates

ADR (Australian Design Rules) compliance means modifications must meet national safety standards. Common mods requiring ADR approval include:

• Aftermarket headlights (LED/HID)
• Steering wheels & seats
• Exhaust systems
• Brake system upgrades

For significant modifications like turbochargers or engine swaps, an engineering certificate issued by an accredited engineer is mandatory nationwide.

Illegal Modifications (Across Australia)

Regardless of state, some modifications are universally illegal, including:

• Nitrous oxide systems (NOS)
• Excessively loud exhaust systems (over 90 dB)
• Obstructive window tints (below minimum transparency)
• Unapproved tyre protrusions beyond fenders
• Unsafe ride heights (too low or high, compromising stability)

Key Takeaways for Modifying Your Car Legally in Australia

• Always check your specific state/territory rules.
• When in doubt, seek professional advice or a qualified engineer.
• Ensure any purchased parts explicitly mention ADR compliance or certifications.

Considering modifying a P-plate vehicle? Laws can differ, so check our dedicated guide to ensure you're staying legal and safe.

Conclusion

While car modification can greatly enhance your driving experience, understanding legal restrictions is crucial. Adhering to guidelines protects you from fines and ensures your vehicle remains safe and roadworthy.

Ready to modify legally? Explore DriftNDrive’s premium selection of compliant performance parts today!