Skip advert
Advertisement

Guide to car windscreen repair and car window replacement

What to do if you get a stone chip or crack in your car windscreen

Saab 9-5 windscreen

It is a huge annoyance when you get a stone chip in your windscreen, and if it’s right in your line of sight when driving, it becomes infinitely more vexxing. Even if your screen survives the chip and doesn’t crack, there is still the possibility that the damage will cause your car to fail its next MoT, especially if it is in a critical area such as in front of the driver. In short,it is worth fixing stone chips and other windscreen damage sooner rather than later.

Advertisement - Article continues below

The MoT rules say that any windscreen damage with a diameter greater than 10mm, in a 290mm wide zone directly in front of the driver will result in an immediate failure.  For the remaining area of windscreen which the wipers sweep, any damage with a diameter larger than 40mm will automatically fail your car as well.

That being said, should a chip occur outside these critical areas, don’t put off repairing the windscreen as the longer you wait to repair it, the worse it could get and the more it will cost to sort out. Simple stone chips are relatively inexpensive compared to replacing an entire slab of windscreen glass designed specifically for your car.

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

riving with a small stone chip in your car’s windscreen should not cause undue safety concerns. In theory, a chip could spread rapidly and shatter your windscreen, but in reality windscreen experts Auto Glass say this is an incredibly unlikely scenario. The laminated design of modern car windscreen glass – windscreens are typically constructed from two layers of glass sandwiched either side of a sheet of vinyl – is incredibly resilient.

Windscreen repair

What can happen though, is that moisture can seep inside a crack and cause localized delamination and discolouring, effectively extending the area of damage. Shocks from vibration, or even extremes of temperature can cause stone chips to extend into areas of localised crazing too. Again, while neither of these scenarios are immediately dangerous – unless your vision is significantly obstructed – you will need a new replacement windscreen as a chip repair kit won’t be able to deal with it.

Advertisement - Article continues below

How to demist your car windows

How to repair a chipped windscreen

You can repair a windscreen yourself using a DIY resin kit, but many drivers with comprehensive insurance cover won’t have to bother. Insurers are generally delighted to cover the relatively small charge for a commercial repairer to spruce up your screen, as it often means they won’t be faced with a much bigger bill for a replacement windscreen.

Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

You can find a windscreen repairer online, but you’re just as likely to find somebody offering insurer-approved repairs in the car park while you shop at your local superstore. Best of all, you generally only have to give the repairer your insurance company details, and they'll invoice the insurer direct on your behalf.

Tyre pressures and tread depths explained

There is a downside, of course, which is that the warranty on screen repairs is virtually non-existent, and if it doesn’t work you could still be in line for a windscreen replacement. If you’re not covered on insurance, or have a big windscreen excess, this is the risk you take. Don’t expect your repairer to do anything other than point to their disclaimer.

DIY windscreen repair kits

Peugeot 208 windscreen detail

If your windscreen isn’t covered on insurance, and if you’re confident with general DIY, you can save money repairing your windscreen with a kit bought from a car accessory shop. The kits are cheap and include a syringe and resin to force into the crack in your glass. We’ve heard good reports from people who have used the kits successfully, but of course you do need to follow the instructions to the letter – and be prepared to put it down to experience if the repair doesn’t work out.

How to replace a car windscreen

We paid a visit to Autoglass to try out some of their patented windscreen-fitting tech and had a go at changing a screen. Staff from the firm did the preparation, ensuring the car’s exterior and interior were protected and removing the car’s windscreen wipers.

windscreen replacement

The windscreen fitter's toolbox consists mainly of sophisticated clamps and lifting devices. A clever cutting tool – similar in appearance to a large fishing reel – is used to garrote the glue holding the screen in place and break it free. Most impressive is the ‘1-Tek’ that allows one technician to lift and manoeuvre a windscreen that would normally require two people.

We were amazed by just how heavy the screen was, but we were shown the correct technique to use and were eventually able to do the job without assistance.

The screen had to be cleaned before being lowered into place with new glue. Great care has to be taken to line it up correctly, but this is no problem if you use the correct technique. We were even told that our windscreen fitting was “a good job for a first attempt”.

Get more great car tips and expert advice here...

Skip advert
Advertisement
Skip advert
Advertisement

Recommended

Best pressure washers for cleaning your car
Alloy wheel being cleaned with pressure washer
Product group tests

Best pressure washers for cleaning your car

We fire up ten pressure washer rivals to discover which cleans up when it comes to washing a car
18 Jun 2024
Best fabric protectors 2024
Fabric protector test - spraying a seat
Product group tests

Best fabric protectors 2024

We reveal the best way to keep your upholstery up to scratch
17 Jun 2024
How much does a car wash cost? Automatic car wash, hand car wash and do it yourself prices compared
Auto Express contributor Tom Barnard sitting in the Mazda 3's boot
Features

How much does a car wash cost? Automatic car wash, hand car wash and do it yourself prices compared

Can cleaning your motor by hand, rather than at a car wash, save you money? We did all the calculations to find out
4 Jun 2024
Best car wash wax sprays 2024
Best car wash wax - header image
Product group tests

Best car wash wax sprays 2024

Want to just wash and go but also need protection? Here’s the answer
31 May 2024

Most Popular

No more EV! New BMW X3 gets petrol, diesel and PHEV power only
BMW X3 - front
News

No more EV! New BMW X3 gets petrol, diesel and PHEV power only

The all-new premium BMW X3 SUV has a sharp new look and cutting-edge tech, but no iX3 EV this time around
18 Jun 2024
New Citroen C3 Aircross gets seven-seats to fight Dacia Jogger, plus £25k pure-electric version
Citroen C3 Aircross - front reveal
News

New Citroen C3 Aircross gets seven-seats to fight Dacia Jogger, plus £25k pure-electric version

Citroen has somehow managed to cram seven seats into its new compact SUV, although the pure-electric e-C3 Aircross is only available with five
19 Jun 2024
Car Deal of the Day: £14,000 off a factory fresh, top-of-the-range Nissan Leaf
Nissan Leaf
News

Car Deal of the Day: £14,000 off a factory fresh, top-of-the-range Nissan Leaf

Nissan’s electric family hatchback with a huge discount is our Deal of the Day for 20 June
20 Jun 2024