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MOT Windscreen Failure Cost: Chip & Crack Rules
A windscreen chip or crack fails the MOT only when it crosses a size limit that depends on where it sits. In the driver's zone the limit is small; a chip bigger than a 5p can fail. Get it wrong and you pay to fix it twice: once for the fail, once for the retest. This page covers the exact DVSA rules and what a repair or replacement costs in 2026.
Does a windscreen chip fail the MOT?
It fails if it is over 10mm in zone A, the 290mm-wide strip of the swept area centred on the steering wheel, or over 40mm anywhere else the wipers clear. A small chip outside zone A usually passes, but repairing it early (£40-70, often free on insurance) beats a full replacement (£250-450, or £400-1,000 if the car has a camera behind the glass) once it spreads.
Source: DVSA MOT inspection manual, section 3 "Driver's view of the road" on gov.uk. Repair and replacement prices are 2026 market estimates.
Cheapest fix
£10
Wiper blade swap
Chip repair
£40-70
Often free on insurance
Replacement
£250-450
No camera fitted
ADAS screen
£400-1,000
Glass + recalibration
The DVSA Windscreen Damage Rules
| Area of the glass | What it means | Fail limit |
|---|---|---|
| Zone A (driver's view) | A 290mm-wide vertical strip in the swept area, centred on the steering wheel | Damage over 10mm fails |
| Rest of the swept area | Everywhere else the wiper blades clear the glass | Damage over 40mm fails |
| Outside the swept area | Corners and edges the wipers never touch | Not size-limited |
The catch most drivers miss is that zone A is narrow but strict. It is only 290mm wide, roughly the width of the steering wheel, but inside it the limit drops to 10mm, about the size of a 5p coin. A chip you would happily ignore fails the moment it lands in that strip. Everywhere else you have a 40mm tolerance, but a crack rarely stays put: thermal stress and vibration spread it, and once it reaches zone A or 40mm it fails.
Windscreen and Visibility Repair Costs 2026
| Fix | Typical cost |
|---|---|
| Chip repair (single stone chip) | £40-70 |
| Standard windscreen replacement (no camera) | £250-450 |
| ADAS windscreen replacement (post-2018 with camera) | £400-1,000 |
| ADAS camera recalibration (on its own) | £150-400 |
| Wiper blades (front pair) | £10-25 |
| Washer pump or jets | £40-150 |
Why Newer Windscreens Cost So Much More
A windscreen used to be a piece of glass. On most cars built from around 2018 it is now a sensor mount. Behind the glass sits a forward-facing camera that runs lane-keep assist, automatic emergency braking, traffic-sign recognition and adaptive cruise control, collectively known as ADAS (advanced driver-assistance systems).
When that glass is replaced, the camera moves by a fraction of a degree, and a fraction of a degree at the front of the car is metres of error at 100 metres down the road. So it has to be recalibrated: a static calibration against a target board in the workshop, a dynamic calibration on a road drive, or both. That step alone adds £150-400, which is why an ADAS windscreen replacement (£400-1,000) can cost twice what the same job costs on an older car (£250-450).
It is not a step you can skip. An uncalibrated camera can brake or steer at the wrong moment, and a driver-assistance warning light left on can itself be an MOT concern. If you are quoted for a replacement, always ask whether recalibration is included in the price.
It Is Not Just the Glass
The "driver's view of the road" category covers everything that affects what the driver can see, not only the windscreen. The common, and usually cheap, failures are:
- Wiper blades. Split, perished or smearing blades fail. A front pair is £10-25 and takes five minutes.
- Washers. No fluid reaching the glass is a fail. Top up the bottle, and clear or replace blocked jets (free to £150 for a dead pump).
- Mirrors. A required mirror that is missing, insecure or too damaged to give a clear view fails. A replacement glass is £10-40; a full wing-mirror unit more.
- View obstructions. Large stickers, dash-cams, air fresheners, phone mounts or sat-navs placed in the swept area can fail. Move them out of zone A before the test; it costs nothing.
Because so many of these are free or near-free to put right, the driver's-view category is one of the easiest to clear in a pre-MOT check.
Related MOT failure costs
A failed MOT usually records more than one defect. These are the other most common failure categories and what they cost to put right, plus the full top-10 failure list.
Blown bulbs, indicators and headlight aim.
Suspension failure costShock absorbers, springs, ball joints and bushes.
Brake failure costPads, discs, corroded lines and sticking calipers.
Tyre failure costTread below 1.6mm, sidewall damage, uneven wear.
Body corrosion failure costStructural rust on sills, arches and subframe.
Emissions failure costHigh emissions, blocked DPF, failed catalytic converter.
Average MOT repair costWhat a typical failed-MOT bill actually comes to.
Frequently Asked Questions
Does a windscreen chip fail the MOT?
It depends on where the chip is and how big it is. In zone A, the 290mm-wide strip of the swept area centred on the steering wheel, damage over 10mm in diameter is a fail. Anywhere else in the area the wipers sweep, the limit is 40mm. A small chip outside zone A usually passes but is worth repairing before it spreads, because a repair costs £40-70 while a replacement runs into the hundreds.
What size crack fails an MOT?
A crack fails if it is larger than 10mm anywhere in zone A (the 290mm driver's strip) or larger than 40mm in the rest of the swept area. In practice most cracks fail, because a crack long enough to see is almost always longer than 40mm and cracks tend to run into zone A. The tester also fails any damage, of any size, that significantly affects the driver's view of the road.
What percentage of MOT fails are for the driver's view?
The DVSA "driver's view of the road" category accounts for 8.54% of all recorded MOT defects on Class 3 and 4 vehicles (DVSA data for April to June 2025). It is the fifth most common defect category, ahead of both exhaust/emissions and body/structure. Most of these defects are cheap to fix: wiper blades, a chip, or an obstructed view.
How much does it cost to fix an MOT windscreen failure?
The cheapest fix in the category is a set of wiper blades at £10-25. A repairable chip is £40-70, and is often free on comprehensive insurance with a glass excess of £0 for repairs. A full windscreen replacement is £250-450 on a car with no camera, rising to £400-1,000 on a post-2018 car whose driver-assistance camera has to be recalibrated after fitting.
Why is an ADAS windscreen so much more expensive to replace?
Cars built roughly from 2018 onward carry a forward-facing camera behind the windscreen that runs lane-keeping, automatic emergency braking and adaptive cruise control. When the glass is replaced, that camera must be recalibrated so it points where the car's computer expects. The recalibration adds £150-400 on most cars and is not optional: an uncalibrated camera can misjudge distances and is itself an MOT and safety concern.
Can I drive to the MOT with a cracked windscreen?
You can, but a windscreen that obstructs your view can also be a separate offence (driving with a defective windscreen), carrying a fine and points, and your insurer may query a claim. If the crack is in zone A it will fail the MOT anyway, so it is usually cheaper to get it repaired or replaced before the test than to pay for a fail and a retest.
Do wipers and washers form part of the MOT?
Yes. The driver's view section checks that the wipers clear the screen well enough to give a clear view, that the washers deliver fluid to the glass, and that mirrors are secure and give an adequate view. A torn or smearing wiper blade, an empty or non-working washer, or a missing required mirror are all failures, and all are cheap to put right before the test.
See every failure category and what it costs
The driver's view is the fifth most common MOT defect. See the full DVSA top-10 with repair costs.
All MOT Failures & Repair Costs