Do Tinted Windows Fail an MOT? What’s Legal in the UK?

Tinted windows can enhance your car’s appearance and offer privacy, but they must comply with UK road safety standards. If your tints are too dark, they may cause your vehicle to fail its MOT test. So, how do tinted windows affect your MOT, and what are the legal requirements?

Are Tinted Windows Checked During an MOT?

Yes, MOT testers examine the level of light passing through your car’s front windscreen and front side windows. This is because excessively dark tints reduce visibility, which can pose a risk to both the driver and other road users.

What Are the Legal Tint Limits in the UK?

The UK law specifies the minimum amount of light that must pass through your windows:

• Front windscreen: Must let at least 75% of light through.
• Front side windows: Must let at least 70% of light through.
• Rear windows and rear windscreen: No legal limit – you can tint them as much as you like.

If your tint is darker than these limits on the front windows, your vehicle could fail its MOT.

How Do Testers Measure Tint Levels?

During an MOT, testers may use a light transmission meter to check how much light passes through your glass. If the tint appears overly dark to the naked eye, they are likely to investigate further.

Will Tinted Windows Always Cause an MOT Failure?

No. If your tints comply with UK regulations, your car will pass the MOT without issue. However, if the tint significantly reduces visibility, particularly in poor weather or at night, it can result in a failure or advisory note.

What to Do If Your Tints Are Too Dark

If you suspect your window tints might not meet the legal requirements:

1. Test them before your MOT using a light meter if possible.
2. Remove or replace the tints if they are too dark.
3. Consult a professional to ensure compliance with regulations.

Conclusion

Tinted windows are allowed in the UK, but they must meet strict light transmission rules to pass an MOT. As long as your front windows let in enough light, your tints will not cause a problem. Rear windows have no restrictions, so you can customise them freely.