Window Tint Percentage: How to Pick the Right Shade for Your Ride

Looking at tint film and wondering what those numbers actually mean? Most shops talk about 35%, 20% or 5% tint, but the meaning behind the numbers can be confusing. In this guide we break down the basics, cover the legal limits in the UK, and give you practical tips so you get the right balance of privacy, heat reduction and visibility.

What the Numbers Mean

When you see a percentage on a tint label it’s the amount of visible light that can pass through the glass. A 35% tint lets 35% of outside light in and blocks the rest. The lower the number, the darker the film. Here’s a quick cheat‑sheet:

• 70%‑35%: Light tint, good for UV protection while keeping the interior bright.
• 30%‑20%: Mid‑range tint, popular for heat reduction and a sleek look.
• 15%‑5%: Dark tint, gives maximum privacy but can affect night‑time visibility.

Remember, the percentage is about visible light transmission (VLT). It doesn’t tell you how much infrared (heat) or UV light is blocked. For that you need to check the product specs – many modern films block 99% of UV and a large chunk of infrared, even at higher VLT levels.

Legal Limits and Safety Tips

The UK has clear rules on how dark you can go. Front side windows and the windshield must let at least 70% of light through. Rear side windows can be darker – many drivers go down to 35% or even 20% – but the rear window must stay above 70% unless you have a special exemption.

Why do the rules exist? Dark windows can hide a driver’s eyes, making it harder for police and other drivers to see you. They also reduce visibility in rain or at night, raising the risk of an accident. To stay safe and legal, check your local regulations before you order film.

Here are a few practical pointers:

• Ask the installer for a VLT certification. It’s a small slip that shows the exact percentage.
• Consider a film with high UV and infrared blockage even if the VLT is higher. You’ll still get heat reduction without breaking the law.
• If you drive a lot at night, avoid going below 30% on the front windows – it can make spotting pedestrians harder.
• Keep the windshield clear. Most people only tint the top 5‑6 inches to block glare, but that part still counts toward the 70% limit.

Choosing the right tint isn’t just about looking cool. It’s about protecting your interior, staying comfortable, and staying within the law. Think about where you drive most – if you’re in a hot, sunny area, a darker rear window with a high‑performance, high‑UV film will keep the cabin cooler. If you’re in a city with lots of night driving, stick to a lighter shade on the front.

Bottom line: read the VLT percentage, match it to the legal limits, and look for UV/IR specs that give you the heat protection you need. With the right info you’ll get a tint that looks good, feels comfortable, and keeps you on the right side of the law.