NZ Window Tint Rules At A Glance
Windscreen: at least 70% of light must get through. The only tint allowed is an anti-glare strip at the top, which can't come lower than the bottom of your sun visors when they're folded down.
Front side windows: at least 35% of light must get through.
Rear side and rear windows on passenger cars: 35% or lighter.
Rear windows on vans, utes and some other vehicles: can be darker, as long as the vehicle has mirrors on both sides.
Reflective tint: windows can't have a mirrored effect that could dazzle other road users.
What Does "35% Tint" Actually Mean?
Tint is measured by visible light transmission (VLT): the percentage of light that passes through the window. A 70% film is very light. A 5% film is almost black.
Here's the part many people miss. NZ's rules apply to the overall light coming through the window, glass and film together. Factory glass already blocks some light, so putting a 35% film on it can take the window below 35% overall. That's why we check your glass and your vehicle type before recommending a shade.
Do The Rules Change By Vehicle Type?
Yes. Most hatchbacks, sedans, wagons and passenger SUVs must stay at 35% or lighter on every side and rear window. Vans, utes and some other vehicle types can have darker tint on the windows behind the driver, as long as they have mirrors on both sides.
If you're not sure which rules apply to your vehicle, ask us. We check every vehicle before we tint it.
Which Tint Film Should You Choose?
The shade decides how dark your windows look. The film type decides how much heat it keeps out. We fit three types of film, all available in legal shades:
Carbon tint: great value, a matte non-reflective finish and good heat and glare reduction. It won't fade purple.
Ceramic tint: our most popular film. It rejects more heat without needing to go darker, with excellent clarity day and night.
IR ceramic tint: our top film, with maximum infrared heat rejection for the coolest possible cabin, even in lighter shades.
All three are non-metallic, so they won't interfere with GPS, phone signals or keyless entry.
Window Tint Mistakes To Avoid
Going as dark as possible on the front windows. It's illegal below 35% and makes night driving harder.
Cheap dyed film. It can fade purple, bubble and peel within a few years.
DIY kits. Bubbles, dust and peeling edges are common, and a failed WoF means paying to remove it.
Ammonia-based glass cleaners. They can damage tint film over time. Use a tint-safe cleaner and a soft microfibre.
Is Window Tint Worth It?
For most drivers, yes. Quality tint keeps your car cooler on Waikato summer days, blocks UV that fades your dashboard and seats, cuts glare from low sun and keeps valuables out of sight. It's less worthwhile if you only want very dark tint on a passenger car. You can't legally go below 35%, so choose a ceramic film for heat control instead of a darker shade.
Legal Window Tint FAQs
Is 20% tint legal in NZ? Not on front side windows, and not on passenger cars. A 20% tint can only go on the rear windows of vehicles allowed darker tint behind the driver, such as many vans and utes, and only if they have mirrors on both sides.
Can I tint my windscreen? Only with an anti-glare strip across the top. It can't come lower than the bottom of your sun visors when they're folded down.
Is reflective or mirror tint legal? Windows can't have a mirrored effect that could dazzle other road users, so highly reflective film isn't an option.
Can I keep factory-tinted rear windows? Yes. Factory privacy glass is normally fitted to meet the rules for that vehicle. If you add film on top, the overall light coming through still has to meet the limit for your vehicle.
How long before I can wind my windows down? Tint needs a few days to cure. We'll tell you exactly how long when you collect your car.
Do you tint EVs? Yes. Our carbon and ceramic films are non-metallic, so they won't interfere with keyless entry, phone signals or in-car tech.
Get A Legal Tint Quote
Tell us your car's make and model and the look you're after. We'll recommend a legal shade and the right film, with a clear quote. We tint cars, utes, SUVs and vans for drivers across Hamilton, Cambridge, Te Awamutu and the wider Waikato at our Riverlea workshop. Get a quote online or call Mat on 027 352 6667.
About The Author
Mat is the founder of Mats Detailing in Hamilton. A former automotive painter, he has worked on more than 1,000 vehicles and has run Mats Detailing since 2019, specialising in paint correction, coatings, paint protection film and window tinting.
