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Dark tinted windows look sleek and provide privacy, UV protection, and heat reduction — but if they’re too dark, they can quickly put you on the wrong side of New Zealand’s vehicle regulations.
At HLWrap, we often get asked, “How dark can I legally tint my car windows in NZ? or are dark tinted windows iellgal?” The answer depends on where the tint is applied (front, rear, or windscreen) and whether it’s factory-tinted glass or aftermarket film.
Let’s break down the legal standards and help you stay compliant while enjoying all the benefits of window tinting.
Summary: Are Dark Tinted Windows illegal?
In New Zealand, dark tinted windows are not fully illegal, but they must comply with NZTA visibility laws. The minimum visible light transmission (VLT) for front side windows is 35%, and windscreens cannot be tinted below the manufacturer’s tint strip. Rear and back windows can be darker in some cases, especially on SUVs and vans. Non-compliance can lead to Warrant of Fitness (WOF) failure, fines, or orders to remove the film.
Understanding NZ’s Window Tint Laws
The NZTA (New Zealand Transport Agency) regulates window tinting through the Land Transport Rule: Glazing 2006. This law defines how much light must pass through your car’s windows — a measure known as Visible Light Transmission (VLT)
What is Visible Light Transmission VLT?
VLT (%) means the amount of light that can pass through your window.
- A 70% VLT = very light tint (70% of light passes through).
- A 35% VLT = moderate tint (only 35% of light passes through).
- A 20% VLT = very dark tint.
Legal VLT Requirements in NZ?
For most sedans, hatchback, compact cars usually dark tinted windows such as 5% or 20% are illegal to have, the legal limit is when the glass with tinted film on has a reading of >35% VLT.
For vans, utes, SUVs, and commercial vehicles, darker rear tints are generally accepted as long as the driver has two side mirrors for rear visibility.
We have a full in-depth guide on legality of window tint.
Why NZ Law Restricts Dark Tints
Tint laws aren’t just about aesthetics — they exist for safety reasons:
- Driver Visibility: Extremely dark tint reduces vision at night or in bad weather.
- Road Safety: Police and WOF inspectors must see inside the car for safety and enforcement.
- Accident Prevention: Clearer windows help ensure drivers can make eye contact with pedestrians or other drivers.
Penalties for Illegal Window Tint in NZ
If your tint is darker than the legal VLT limit, you risk:
- Failing your Warrant of Fitness (WOF)
- Potentially receiving a defect notice or fine from NZ Police
- Being required to remove the tint before driving again
How to Check if Your Tint is Legal
You can test the darkness of your tint using a VLT meter, available at most testing stations and professional installers like HLWrap.
At HLWrap East Tāmaki, we always use certified films that meet NZ WOF standards, ensuring your tint is stylish yet 100% compliant.
If you’re unsure, visit our workshop for a free tint inspection and we’ll measure your current VLT on the spot.
Factory vs Aftermarket Tint: What’s the Difference?
- Factory Tint: Applied during glass manufacturing — usually green or grey tint with about 70–80% VLT.
- Aftermarket Tint: Film applied to the inside of the glass after purchase — this reduces VLT further.
For example, if your factory glass already has 70% VLT and you add a 35% film, the combined VLT could drop below 35% — making it illegal.
That’s why it’s essential to work with a professional installer who knows how to measure final VLT accurately.
If you would like to get a quotation for your car, contact us now!
What About Rear Window Tinting?
Rear windows (including the rear windscreen) are treated more flexibly.
As long as your vehicle has side mirrors for rear visibility, you can legally apply darker tints — even down to 20% or lower only only for Non-MA cars.
That’s why many SUVs, utes, and family vans feature dark rear privacy glass from the factory or dark film added later.
Final Thoughts:
Dark window tints can absolutely transform your car’s look and comfort — but it’s vital to keep them within legal limits.
By following NZTA rules and choosing a professional installer like HLWrap East Tāmaki, you get the perfect balance of style, comfort, and compliance.
Book your car tint appointment with HLWrap Auckland today — where we combine precision, quality, and NZ-compliant films for peace of mind and style.
FAQ:
Is 20% tint illegal in NZ?
Yes for front side windows. They must be at least 35% VLT. You can use 20% for rear windows if your vehicle is classified as non MA vehicle.
Will I fail my WOF for tinted windows?
Only if the film is darker than 35% on front windows or the installer has used non-compliant film.
Does factory tint count towards VLT limits?
Yes. Your factory glass already reduces light transmission, so the final VLT after film must still be at least 35%.
