UK Window Tint Laws
A practical guide to UK window tint laws
If you are thinking about tinting your car windows in the UK, it is important to understand which windows are legally restricted and which are not.
In the UK, the rules apply to the front windscreen and front side windows, and the legal limits depend on when the vehicle was first used. There are no specific tint limits for rear side windows or the rear windscreen under these rules.
This guide explains the UK window tint laws in simple terms, including light transmission limits, penalties, and what the rules mean if you are considering Solarplexius for your vehicle.
Quick summary of UK window tint laws
- Front windscreen: legal minimum depends on the age of the vehicle
- Front side windows: must meet a minimum visible light transmission level
- Rear side windows: no specific tint limit under UK window tint rules
- Rear windscreen: no specific tint limit under UK window tint rules
If you are only tinting the rear windows, the legal position is different from the front of the vehicle.
Legal tint limits for car windows in the UK
In the UK, tinted window rules are based on Visible Light Transmission (VLT). This means the percentage of light that passes through the glass.
The legal limits for the front windscreen and front side windows depend on when the vehicle was first used.
Vehicles first used on 1 April 1985 or later
Front windscreen: must let at least 75% of light through
Front side windows: must let at least 70% of light through
Vehicles first used before 1 April 1985
Front windscreen: must let at least 70% of light through
Front side windows: must let at least 70% of light through
Rear windows
UK window tint laws do not set the same tint limits for the rear side windows or the rear windscreen. That is why rear-window solutions are treated differently from front-window tinting.
UK window tint law reference table
| Windows | Vehicle first used before 1 Apr 1985 | Vehicle first used on 1 Apr 1985 or later |
| Front Windscreen | 70% VLT | 75% VLT |
| Front side windows | 70% VLT | 70% VLT |
| Rear side windows | No specific tint limit | No specific tint limit |
| Rear windscreen | No specific tint limit | No specific tint limit |
Important: Factory glass may already have some tint. If additional film or shading is added to the front windows, the total light transmission could fall below the legal minimum.
What does VLT mean?
VLT stands for Visible Light Transmission. It tells you how much light passes through a window.
- A higher VLT means the glass is lighter
- A lower VLT means the glass is darker
For example, if a window has 70% VLT, that means 70% of visible light passes through it. UK tint rules for front windows are based on this measurement.
How tinted windows are checked in the UK
The police and DVSA vehicle examiners can check tinted windows using light-measuring equipment.
If the front windscreen or front side windows are too dark, the vehicle may be treated as non-compliant with UK window tint laws.
What do these laws mean for Solarplexius?
Solarplexius is designed for rear side windows and the rear windscreen, depending on the vehicle model.
That means the product is intended for the part of the vehicle where UK tint rules are different from the front windscreen and front side windows.
If you want a rear-window solution for privacy, shade, and comfort, you can explore our car window tinting range here.
Why do front window tint laws exist?
The rules for the front windscreen and front side windows are there for road safety.
Drivers need enough visible light through the front of the vehicle to maintain clear vision, especially in poor weather, low light, and changing road conditions. If the front windows are too dark, visibility can be reduced and that may increase safety risks.
What is the penalty for illegal window tint in the UK?
f your front windscreen or front side windows are tinted beyond the legal limit, you could face enforcement action.
According to GOV.UK, this can include:
- a prohibition notice preventing you from using the vehicle on the road until the extra tint is removed
- a penalty notice
- or a court summons
It is also illegal to fit or sell glass, or a vehicle with glass, that does not comply with the rules on tinted windows.
Looking for window tint prices?
The cost of tinting car windows in the UK depends on the vehicle, the number of windows covered, and the type of solution you choose.
If you want a full pricing guide, read our article on how much it costs to tint car windows.
Frequently asked questions about UK tint laws
Can I tint my front windows in the UK?
Only if the front windscreen and front side windows still meet the legal minimum light transmission limits. The rules depend on when the vehicle was first used.
Are rear window tints legal in the UK?
UK window tint laws do not set the same specific tint limits for the rear side windows and rear windscreen as they do for the front windows.
Does factory-tinted glass matter?
Yes. Factory glass may already reduce light transmission, so adding more tint to the front windows could take the total below the legal limit.
Can Solarplexius be used on the front side windows?
No. Solarplexius is intended for rear side windows and the rear windscreen, depending on the vehicle model.
How can I check if my window tint is legal?
The legal test is based on how much light passes through the glass. Police and DVSA examiners can measure this using light-testing equipment.
Source
This guide is based on official UK government guidance about tinted vehicle windows.
Source: GOV.UK – Tinted vehicle windows: the law
