Is my window tint legal?

In Great Britain, a car first used on or after 1 April 1985 must let at least 75 per cent of light through the windscreen and at least 70 per cent through the front side windows. GOV.UK's tinted window rules, checked in 2026, state those minima. The law is regulation 32 of the Road Vehicles (Construction and Use) Regulations 1986. Highway Code Annex 6 repeats the same test and adds that factory tint applied during manufacture complies with the visual light transmittance standards.

The figure that matters is the finished glass, including any film. A roll labelled 70 per cent is not a legal result. It is a product claim. Police and DVSA examiners measure the installed screen with light measuring equipment. If the combined glass and film sit below the minimum for that position and first use date, the glass is illegal, even if the film on its own would have passed on clear glass.

Yes. First use is the date the vehicle was first used on the road, which is the date the regulations care about, not the model year on the advert. For vehicles first used on or after 1 April 1985, the windscreen minimum is 75 per cent and the front side windows are 70 per cent. For vehicles first used from 1 June 1978 to 31 March 1985, both the windscreen and the front side windows must let at least 70 per cent through.

Regulation 32 publishes no numerical transmitted light minimum for vehicles first used before 1 June 1978. That is not a licence to black out the screen. Regulation 30 still requires the glass to allow a proper view, and Annex 6 still requires windscreens and windows to be kept clean and free from obstructions to vision. A prohibition can still follow if the driver cannot see.

GOV.UK says it is illegal to fit or sell glass, or a vehicle already fitted with glass, that breaks the tinted window rules. If the windscreen or front side windows are tinted too much you could get a prohibition notice stopping you using the vehicle on the road until you have the extra tint removed, a penalty notice, or a court summons. GOV.UK does not publish a pounds figure for this offence on that page, so this page does not invent one.

A prohibition is the practical penalty. The car stays off the road until the film is removed and, if the officer requires it, rechecked. Driving in breach of the notice is a further offence. Section 42 of the Road Traffic Act 1988 is the Highway Code's cited offence for the tinting duty, alongside regulation 32. Factory tint that already meets the visual light transmittance standard is not the target of this enforcement. Aftermarket film on the front is.

Ask for a transmitted light reading of the finished glass, not the specification of the film. A reputable installer will measure after fitting. If you are buying a used car with aftermarket film, assume the front glass will be measured at the roadside and budget for removal if nobody can show a reading. Rear film is not caught by the published VLT limits, which is why so many cars have dark rears and a clear front.

Highway Code rule 94 adds a related duty: at night or in poor visibility, do not use tinted glasses, lenses or visors if they restrict your vision. That rule is about what you wear, not about the car's glass, but it is the same idea. You have to be able to see. A legal VLT reading on a dirty screen still leaves you with an obstruction offence if you cannot see out.

The MOT looks at whether you can see, and at damage to the glass, rather than repeating the police light-meter test as a numbered VLT fail in the same way. A screen so dark or so damaged that vision is affected can still fail. The roadside prohibition is the more common route for aftermarket film that fails the 75 or 70 per cent test while the driver can still just about see out.

A current MOT does not make an illegal tint legal. GOV.UK's vehicle safety page says a vehicle can be unsafe even with a current certificate. Film fitted the week after a pass is judged on the day you use the car, not on the day of the test.

The published GOV.UK figures turn on the glass position and the first use date, not on whether the vehicle is a van, a taxi, a company car or a hire car. A 2019 van still needs 75 per cent through the windscreen. A courtesy car is no exception. Disabled drivers and older drivers get no published VLT relaxation. If anything, the visibility duty in regulation 30 matters more when eyesight is already marginal, and Highway Code rule 92 is the separate eyesight test of reading a plate from 20 metres.

These percentages are Great Britain figures. Northern Ireland has its own construction and use rules. If you are preparing a car for an NI test or an NI roadside check, confirm the nidirect position. Scotland and Wales use the GB regulation 32 figures on this page. Foreign vehicles used in Great Britain are still using a GB road, so the GB glass rules are the ones a GB officer will measure.

The most expensive myth is that a 70 per cent film is always legal on a modern car. It is the front side window minimum after April 1985, not the windscreen minimum. The next is that rear limits exist and that someone on a forum knows they are 20 per cent. GOV.UK publishes no rear VLT limit. The next is that a sunstrip is always illegal, or always legal. A sunstrip is judged as part of the windscreen's transmitted light and as an obstruction. This page does not invent a sunstrip size, because the cited GOV.UK page does not publish one.

People also think a police officer has to accept the installer's certificate. The test is the meter on the glass. They think a classic car first used in 1977 can run any tint. Regulation 32 has no number for that car, but the driver still has to see. They think removing the film after a prohibition can wait until the weekend. The notice says the car cannot be used until it is removed. They think a ceramic coating or a clear stone-chip film is always outside the test. If it changes how much light the finished windscreen lets through, it is inside the test.

Take the film off the front glass, then ask how the officer wants it rechecked. Do not drive to the installer on the prohibited vehicle unless the notice allows a journey for that repair. A courtesy car, a lift, or the installer attending are the usual options. Keep a receipt for the removal. If a penalty notice or summons follows, it is a separate process from the prohibition, and ignoring the notice is how a glass job becomes a court date.

Refitting a lighter film is still a measurement. The 75 per cent windscreen minimum for a post-April 1985 car does not have a 'close enough' band. If you want any film on the front, have it measured after fitting and keep the reading with the car. Rear film can stay, because GOV.UK publishes no rear VLT limit, as long as you can still see to reverse and the mirrors still do their job.