Window tinting is one of the most popular car modifications in the UK, but it is also one of the most frequently misunderstood. The rules around window tint are precise, and driving with illegal window tint can result in fines, points on your licence and a requirement to remove the tint before the car can be driven again. In 2026, here is the complete guide to legal window tint limits in the UK.

UK Window Tint Law — The Basic Rule

UK window tint law regulates the amount of light that can pass through the glass, measured as the Visible Light Transmission percentage — VLT. The lower the VLT, the darker the tint. The law sets maximum tint limits for specific windows on the car.

VLT Limits by Window

Windscreen

The law is strictest for the windscreen. A light band at the top of the windscreen is permitted, but it must not extend below the upper 10 percent of the windscreen. Any tint below this line on the windscreen is illegal. Some factories apply a light green tint to the top of the windscreen as standard — this is legal.

Front Side Windows

Front side windows — the windows either side of the driver's and passenger's seats — must allow at least 70 percent of light to pass through. This means the maximum legal tint on front side windows is 30 percent. Any darker than 30 percent VLT is illegal for road use on the front windows.

Rear Side Windows

Rear side windows — those behind the front seats — have no minimum VLT requirement under UK law. You can apply any level of tint to rear side windows. However, if you are driving into Northern Ireland from Great Britain, Northern Irish rules require rear windows to allow at least 75 percent light through.

Rear Window

There is no minimum VLT requirement for the rear windscreen under UK law. Any level of tint can be applied to the rear window.

What About Aftermarket Tint Film?

Aftermarket tint film applied over existing glass reduces the VLT further. If your car already has factory tint, adding film on top can quickly push the front side windows below the 70 percent legal minimum. Always check the combined VLT of factory tint plus aftermarket film before applying any additional tint to front windows.

Police and VOSA Enforcement

Police officers can use a light meter to test window tint on the spot. If a window is found to be below the legal VLT limit, the officer can:

  • Issue a Vehicle Defect Rectification Scheme notice, giving you 14 days to remove the tint
  • Issue a Fixed Penalty Notice for the offence — typically GBP 100
  • Prohibit the vehicle from being driven until the tint is removed

In practice, police tend to use the Rectification Scheme notice for first offences, giving the driver time to remove the tint. Repeated offences or non-compliance result in stronger enforcement.

Why 70 Percent VLT Matters

The 70 percent VLT requirement for front windows exists for road safety reasons. The primary concern is driver visibility — particularly at night, in poor weather and in low sun conditions. Excessive tint on front windows significantly reduces the driver's ability to see pedestrians, cyclists and other road users, particularly in the peripheral vision areas where the most critical hazard detection occurs.

Legal Tint Options for Front Windows

If you want some tint on your front windows but want to stay legal, here are your options:

  • 70 percent VLT: The maximum legal limit. This provides minimal privacy but some UV protection and reduced glare.
  • 65-70 percent VLT: Most legal tints available from reputable installers offer around 70 percent VLT
  • Privacy glass (factory tint): Some cars come from the factory with privacy glass on the rear windows only — this is fine for the rear but adding film to front windows may push the total below 70 percent

Medically Exempt Drivers

Drivers with certain medical conditions that cause photosensitivity — making them sensitive to bright light — can apply to DVLA for a medical exemption certificate. This allows the use of darker front window tints for medical reasons. The exemption must be applied for and approved by DVLA — a GP letter alone is not sufficient.

Supplier and Installer Requirements

Any window tint film installed must be:

  • Certificate ofRoadworthiness: Must not have bubbles, creases or peeling edges
  • Non-reflective: Reflective tints are not permitted on any car windows
  • Manufacturer-approved: Must be a type-approved product for automotive use

Removing Illegal Tint

If you have illegal tint on your front windows, removal is the only legal option. The cost of professional tint removal and replacement ranges from GBP 100 to GBP 400 depending on the car and the complexity of the windows. Many mobile tinters offer same-day removal and can apply a legal replacement film if desired.