How to Tint Your Windows Legally in the UK

Tinted windows can give your car a sleek, modern look while offering practical benefits like UV protection, glare reduction, and added privacy. But if you're based in the UK, there's one crucial thing you can’t afford to overlook: the law. Car window tinting is tightly regulated, and falling foul of these rules could land you with a fine, penalty points or worse, your vehicle taken off the road.

In this guide, we’ll walk you through everything you need to know about tinting your windows legally in the UK, including regulations, tips for choosing the right film, and common mistakes to avoid. Let’s give your motor that sharp edge legally.

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Why Tint at All?

Before we dive into legality, let’s talk about why tinting is such a popular mod. Beyond the aesthetics, window tints can:

• Block up to 99% of harmful UV rays

• Keep interiors cooler during summer

• Protect upholstery from sun damage

• Deter theft by concealing valuables

• Reduce glare from headlights and sun

  
  

When done properly, tints offer a polished finish that elevates the whole look of your car.

What Does the UK Law Say?

In the UK, tinting laws vary depending on which windows you’re modifying. The rules are clear for front facing glass:

Legal Limits:

• Front windscreen must let at least 75% of light through.

• Front side windows (driver and passenger) must allow at least 70% of light through.

  
  

This means very light tints are allowed on the front, but anything darker is illegal.

There are no restrictions on how dark you tint:

• Rear side windows

• Rear windscreen

  
  

So if you want that privacy glass look at the back, go wild.

What Happens If You Break the Law?

If your front window tints are too dark, you could face:

• A ‘prohibition notice’ (banning the car from the road until fixed)

• A Penalty Notice or court summons

• Points on your licence or a fine

  
  

The police can use a light transmission meter on the spot to check compliance. If you’ve had your car tinted by a garage or purchased it used, it's worth double checking.

Tips for Legal Tinting in the UK

1. Choose a Reputable Installer: Professional window tinting shops will know the legal limits and have meters to test visible light transmission (VLT). They’ll also offer warranties and clean, bubble free finishes.

2. Don’t DIY Unless You’re Confident: While there are many DIY kits online, it’s easy to get it wrong especially with the legal margins being so tight. Even a slight miscalculation can push you over the 70% VLT limit on front windows.

3. Check the Factory Tint: Some cars already come with a factory tint (especially on rear windows). Adding film to that can reduce VLT too far. Ask your installer to measure before applying any new tint.

4. Keep Your Certificate: If your tint is checked and deemed borderline, having a certificate of compliance from a licensed installer can help you out.

What’s the Best Tint Shade?

If you're tinting your rear windows, you have far more flexibility. Here’s a breakdown:

• 70%+ light transmission barely noticeable; legal for front windows

• 50% light smoke; still quite subtle

• 35% medium smoke; a balanced look

• 20% factory style privacy glass

• 5% (Limo Tint) maximum privacy; very dark; illegal on front windows

  
  

Many drivers opt for a 35% rear tint for a clean, classy aesthetic that offers privacy without going overboard.

Can You Get Medical Exemptions?

Yes, but they’re rare. The DVSA allows exemptions in special medical cases, e.g., people with extreme light sensitivity. You’d need documentation and approval before applying an extra dark film legally.

What About Vans, SUVs and MPVs?

The rules still apply to front facing windows of any passenger vehicle, no matter its class. So even if you're driving an SUV with heavy factory tint at the rear, the front glass still needs to meet the 70%/75% light threshold.

Will Tinted Windows Affect My MOT?

Yes, if your front tints are too dark, your car will fail its MOT. This is especially true as testers are becoming more aware of tinting laws, and many garages now carry tint meters.

Final Thoughts

There’s no denying it a well tinted car just looks sharper. But cutting corners or going too dark on your front glass isn’t worth the hassle. Stick to the legal limits, use a trusted installer, and double check your light transmission before you hit the road.

Done right, tints can protect your interior, improve driving comfort, and elevate your car’s style all without earning you a ticket.

Sade Okoro

Detailing & Aesthetics Lead, Style & Detail Column