Car Modification Laws & Window Tinting Rules in New Zealand (2025 Update)

 

Modifying your car in New Zealand? Whether you're into window tinting, wheels, exhausts, or wraps – it's important to know what’s legal (and what could fail your WOF). Here's an updated 2025 guide on NZ car modification rules, especially for Auckland drivers.


🚗 1. Window Tinting Rules (WOF Legal Limits)

  • Front side windows: Must let in at least 35% visible light (VLT)

  • Rear side & back window: No VLT limit – can be darker

  • Front windscreen: Tint strip only allowed at top, max 100mm
    👉 Illegal tint may result in WOF failure or fines


🎨 2. Car Wrapping & Paint

  • Vinyl wraps are legal – even colour-changing wraps

  • If your car colour significantly changes, you must update your registration with NZTA

  • Reflective wraps not allowed on certain areas for safety


🔊 3. Exhaust & Noise Limits

  • Must meet NZTA noise regulations

  • Loud aftermarket exhausts (over 95dB) may require LVV certification

  • WOF testers can fail your car if noise is excessive


🛞 4. Wheels, Tyres & Suspension

  • Custom wheels must not extend beyond the guards

  • Lowering your car? Check for minimum ground clearance: 100mm

  • Coilovers or airbags may require LVV certification


💡 5. WOF & Certification

  • Basic mods (tint, wheels, wraps) = WOF okay if within rules

  • Advanced mods (engine swap, chassis cut, airbags) = Need LVV Cert

  • Always check with an authorised certifier or garage


📍 FM7 Tip for Auckland Drivers:

At FM7 Wairau & FM7 Albany, we specialise in WOF-legal window tinting and custom wraps. Need advice or testing? Pop in for a free consultation – no obligation!

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