What is a Windscreen Chip and Why Does it Matter for Your MOT?
A chip in your car's windscreen is a common form of damage, typically caused by impacts from road debris like gravel or small stones. While many drivers might consider a small chip a minor inconvenience, it can have significant implications for your vehicle's roadworthiness, particularly when it comes to passing its Ministry of Transport (MOT) test. The MOT test is an annual inspection in the UK designed to ensure vehicles are safe to drive and meet environmental standards. A critical aspect of this test relates to your windscreen's condition, as it directly impacts visibility and structural integrity.
The Driver and Vehicle Standards Agency (DVSA) has specific guidelines regarding windscreen damage. They are not merely concerned with the aesthetic appearance of your glass but with its ability to provide a clear and unobstructed view of the road for the driver. Furthermore, the windscreen contributes to the structural strength of the vehicle, especially in the event of a rollover. Therefore, damage that compromises these functions can, and often does, result in an MOT failure.
Understanding precisely what constitutes a failure point is key. It's not just about the size of the chip; its location and the extent to which it affects the driver's field of vision are paramount. This article delves into the specific criteria used during an MOT inspection, the potential consequences of a failing windscreen, and the options available to rectify the situation before your test.
The MOT test assesses your windscreen for specific defects that could impair driving safety.
The DVSA's Rules: Where Chips Cause MOT Failure
The Driver and Vehicle Standards Agency (DVSA) provides clear guidelines on windscreen damage that will cause an MOT failure. The core principle is that the damage must not significantly impair the driver's vision or compromise the structural integrity of the vehicle. This translates into specific rules regarding the size, location, and type of damage.
The primary area of concern is the driver's direct line of sight. According to MOT test guidelines, a chip or crack in the windscreen within the area swept by the driver's windscreen wipers will cause an immediate failure if it is larger than 10mm in diameter. This is often referred to as the 'windscreen wiper zone'. For damage outside this primary viewing area, the rules are slightly more lenient but still critical.
Windscreen Wiper Zone Criteria
If the damage (chip or crack) is in the area swept by the driver’s side wiper, it will fail the MOT if it is larger than 10mm. This is a strict limit, and even a small chip in this critical zone can be enough to fail the test.
Direct Line of Sight Rules
For damage located outside the wiper sweep area but still within the driver's direct line of sight, the acceptable limit is larger. A chip or crack that is larger than 40mm in diameter in this zone will result in a failure. The DVSA defines the direct line of sight as the area swept by the wipers and the area directly in front of the driver, extending to the extremities of the windscreen.
Cracks and Multiple Chips
It's not only the size of an individual chip that matters. The length of any crack is also assessed. A crack extending to the edge of the windscreen, or one that significantly weakens the glass structure, can lead to failure. Similarly, while a single small chip might be acceptable, multiple chips, even if individually small, could collectively impair vision or weaken the glass to a point where it fails the test. The MOT tester will consider the overall condition of the windscreen.
A chip exceeding 10mm within the driver's wiper sweep area will cause an MOT failure.
It is important to note that an MOT tester will also look for any damage that could lead to a further crack or compromise the windscreen's structural integrity. Even if a chip is currently within the acceptable limits, if it appears likely to spread or worsen, it might be noted as an advisory, or potentially a failure if the tester deems it a safety risk.
Is a Windscreen Chip an MOT Advisory or Failure?
The distinction between an MOT advisory and an outright failure for windscreen damage is crucial for vehicle owners. An advisory indicates that a component is showing signs of wear or minor defects that are not significant enough to cause an immediate failure but could become a problem in the future. It serves as a warning to the driver to get it checked or repaired sooner rather than later to avoid future MOT failures or safety issues.
If your windscreen has a chip or crack that does not meet the failure criteria, the MOT tester will likely record it as an advisory. For instance, a chip smaller than 10mm in the driver's wiper zone, or a chip smaller than 40mm outside that zone, might be noted. The tester might also issue an advisory for a small crack that is not in the driver's direct line of sight and does not compromise structural integrity. This advisory will appear on your MOT certificate, alerting you to the issue.
When it Becomes a Failure
However, if the damage falls foul of the DVSA's specific measurements and location requirements, it will result in an immediate MOT failure. This happens when:
- A chip or crack is larger than 10mm in diameter within the area swept by the driver’s windscreen wipers.
- A chip or crack is larger than 40mm in diameter in the rest of the windscreen that is in the driver's direct line of sight.
- The damage obstructs the driver’s view of the road in any way, regardless of size or location, as judged by the tester.
- The damage is deemed to have compromised the structural integrity of the glass or the vehicle body.
The MOT tester's judgment is final regarding whether damage impairs the driver's view.
It is also worth remembering that while the specific dimensions are key, the MOT tester has the final say based on their professional judgment. If they believe the damage, regardless of its exact size, poses a safety risk, they are within their rights to fail the vehicle. Therefore, it is always advisable to have any significant windscreen damage inspected and repaired proactively.
Have any windscreen damage assessed by a professional repairer before your MOT appointment; they can advise if it's likely to pass or require attention.
Repair vs. Replacement: What's Your Best Option?
When faced with windscreen damage that risks an MOT failure, the immediate question is whether it can be repaired or if a full replacement is necessary. The decision often hinges on the nature, size, and location of the damage, as well as cost-effectiveness and long-term safety considerations. Fortunately, modern automotive glass repair technology offers viable solutions for many types of chips and small cracks.
When Repair is Viable
Windscreen repair is typically possible for chips that are not too large and are not located in critical areas. The DVSA's guidelines for failure are often based on damage within the driver's primary field of vision. If a chip is smaller than a 40mm diameter, and not in the 10mm critical zone directly in front of the driver, it is often repairable. Repair involves injecting a special resin into the damaged area, which then hardens and restores the structural integrity of the glass. This process can prevent the chip from spreading and significantly improve its appearance, often making it invisible to the MOT tester.
Key Indicators for Repairability:
- Chip size: Generally, chips smaller than a £1 coin are good candidates for repair.
- Location: Damage in the 'windscreen wiper zone' or directly in the driver's line of sight is less likely to be repairable to MOT standards.
- Type of damage: Punctured chips are often repairable, whereas long, deep cracks are not.
- Number of chips: Multiple small chips might be repairable, but a combination of chips and cracks is often too extensive.
When Replacement is Necessary
If the damage is too extensive for repair, or if it's located in a critical area that cannot be fully restored, a windscreen replacement becomes the only option. This is typically the case for:
- Cracks longer than 40mm.
- Damage within the driver's direct line of sight that is larger than 40mm (or larger than 10mm in the wiper zone).
- Damage that extends to the edge of the windscreen.
- Multiple chips or cracks that collectively compromise the glass's integrity.
- Damage that has caused delamination (separation of the glass layers).
For MOT purposes, a repaired chip must effectively restore the windscreen's integrity and clarity.
Many insurance policies include windscreen cover, which may cover the cost of repair or replacement with no excess fee. It is advisable to check your policy details. If not covered, professional repair services can provide quotes for both repair and replacement, allowing you to weigh the costs and benefits. A professional assessment before your MOT is the most pragmatic approach.
Finding a Reliable Windscreen Repair Service
Choosing the right service for windscreen repair or replacement is vital, especially when preparing for an MOT test. The quality of the repair can directly impact whether your vehicle passes the inspection and how long the repair lasts. A professional repair service will not only fix the damage but also ensure it meets the required safety and legal standards for UK roads.
What to Look For in a Repairer
When searching for a reputable windscreen specialist, consider a few key factors. Firstly, look for accredited technicians or companies that are members of industry bodies. While not always mandatory, it can offer an extra layer of assurance regarding their expertise and adherence to standards. Many national chains and local garages offer windscreen services, but it's wise to check reviews and testimonials.
Key Criteria for Selecting a Service:
- Experience: Opt for a service with a proven track record in windscreen repair and replacement.
- Quality of Materials: Ensure they use high-quality resins for repairs and OEM (Original Equipment Manufacturer) or equivalent quality glass for replacements.
- Warranty: A good service will offer a warranty on their work, protecting you against future issues like the repair failing or a new windscreen developing defects.
- Speed and Convenience: Mobile repair services can come to your home or workplace, saving you time and hassle.
- MOT Compliance: Ask if they specifically cater to MOT standards and can guarantee their repair will pass.
A professional repair can often save you the cost and hassle of a full windscreen replacement.
Do not hesitate to ask potential service providers questions about their process, the materials they use, and their guarantee. For example, you might ask about the typical lifespan of a repair or what happens if the chip spreads after the repair. A confident and knowledgeable response from the service provider is a good sign.
Always ask for a written quotation detailing the work to be done and the warranty provided before authorising any repair or replacement.
Proactive Steps: Preventing Chips and Preparing for Your MOT
While dealing with a windscreen chip after it happens is necessary, taking proactive steps can prevent further damage and help ensure your vehicle sails through its MOT test. Prevention is often simpler and more cost-effective than repair or replacement, and a little vigilance can go a long way in maintaining your car's condition.
Preventing Windscreen Chips
The most common cause of windscreen chips is impact from road debris. This is particularly prevalent on motorways and roads where there is a lot of construction or heavy traffic. While you cannot entirely eliminate the risk, you can take measures to minimise it:
- Maintain a Safe Distance: Always keep a good distance from the vehicle in front, especially large trucks or vans that may kick up more debris.
- Avoid Following Too Closely: This is a fundamental rule of safe driving and helps you avoid potential hazards.
- Be Cautious in Certain Conditions: Drive more slowly and carefully in areas known for loose gravel or during roadworks.
- Consider Protective Films: For some vehicles, particularly those used frequently on exposed roads, protective films can be applied to the windscreen, though this is less common than for body paint.
Preparing for Your MOT
Beyond the windscreen, a thorough pre-MOT check can identify other potential issues before they become costly failures. This includes checking tyre tread depth and condition, ensuring all lights are working, testing brakes, and verifying the condition of your wipers and wash system.
Windscreen Preparation Checklist:
- Inspect for damage: Regularly check your windscreen for any new chips or cracks.
- Cleanliness: Ensure the windscreen is clean, both inside and out, for optimal visibility.
- Wiper Function: Make sure your wipers clear the screen effectively without smearing or juddering.
- Washers: Confirm the windscreen washer jets are working and the fluid level is adequate.
Regular visual checks of your windscreen can catch minor damage before it becomes a major problem.
If you discover a chip, the best course of action is to address it immediately. Small chips can often be repaired relatively inexpensively, preventing them from spreading and potentially saving you from a failed MOT and the cost of a replacement. Many mobile repair services can attend to chips quickly, often while you wait.
Understanding MOT Costs and Reminders
When preparing for your vehicle's annual MOT test, understanding the associated costs and how to stay informed about when your test is due can prevent unexpected expenses and legal issues. While the MOT itself has a maximum fee set by the government, the cost of any necessary repairs, such as for a damaged windscreen, can vary significantly.
Maximum MOT Test Fees
The maximum price a garage can charge for an MOT test is regulated. For cars, the current maximum fee is £54.85. Motorcycles have different maximum fees. These prices apply to standard tests. If your vehicle requires a Class 7 MOT (for goods vehicles between 3,000kg and 3,500kg), the maximum fee is higher, currently £74.90.
It is important to remember that these are maximums. Many garages offer MOT tests at a lower price, sometimes even as a promotional offer, especially if you also book a service with them. However, if your vehicle fails its MOT, you will usually have to pay for any repairs needed. If the vehicle is presented for a retest after repairs are completed, the retest fee is often lower or free, depending on when the retest is conducted and the nature of the repairs.
When is My MOT Due?
Knowing when your MOT is due is crucial to avoid driving a vehicle with an expired MOT certificate, which is illegal and can result in fines. For a new car, the first MOT is typically due three years after its registration date. Subsequent MOTs are then due annually. For vehicles older than three years, the MOT is due annually from the date of the previous test.
You can check your vehicle's MOT status and expiry date online via the government's official website.
You can check when your MOT is due using the government's MOT status checker tool, which requires your vehicle's registration number. This tool also allows you to see past MOT test results and any advisories. Many garages also offer an MOT reminder service, where they will contact you a few weeks before your MOT is due, either by email or post. Signing up for an MOT reminder can be a convenient way to ensure you don't miss your test date, allowing ample time for any necessary repairs, such as those for windscreen chips, to be completed.
Can You Tax a Car Without a Valid MOT?
Driving on public roads in the UK requires your vehicle to be taxed, and having a valid MOT certificate is a fundamental prerequisite for this. The Driver and Vehicle Licensing Agency (DVLA) uses the MOT status as a key indicator of a vehicle's roadworthiness before it can be taxed. Therefore, if your vehicle has failed its MOT, you will not be able to tax it until it has passed the test or has had the necessary repairs made and passed a retest.
The Link Between MOT and Car Tax
The process is straightforward: when you declare your vehicle for taxation, the DVLA system checks its MOT status. If the MOT certificate has expired, or if the vehicle has a record of failing its most recent MOT and has not yet passed a retest, the DVLA's system will prevent you from completing the tax disc application. This rule is in place to ensure that only safe and legally compliant vehicles are on the road.
Driving with an Expired MOT
Driving a vehicle that has an expired MOT certificate is illegal. The only exception is if you are driving the vehicle to a pre-booked MOT test appointment. If you are stopped by the police, you could face a fine of up to £1,000, and your car could be impounded. Furthermore, driving without a valid MOT could also invalidate your car insurance, leaving you liable for all costs in the event of an accident.
Exceptions and Considerations:
- New Vehicles: As mentioned, new cars are exempt from their first MOT for three years.
- Pre-booked MOT: You can drive to a pre-booked MOT appointment even if your MOT has expired.
- Repairs: You can drive your vehicle to a place of repair if it has failed its MOT, but only if it is for repair work and not for general use.
A valid MOT is a mandatory requirement for taxing your vehicle and driving legally.
Therefore, if your vehicle has failed its MOT due to a windscreen chip or any other reason, it is essential to arrange for repairs and a retest as soon as possible. Once your vehicle has passed its MOT, you can then proceed to tax it. You can check your MOT status and tax your vehicle online through the GOV.UK website, which will confirm if your vehicle is eligible for taxation.