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Does Fixing a Chipped Windscreen Affect Your No Claims Bonus? UK Rules
A stone chip on your windscreen can quickly expand into an expensive crack. Here is how UK motor insurers treat glass claims, whether your No Claims Bonus is protected, and how windscreen damage affects MOT inspections.
TL;DR: Windscreen claims and NCB
Does a glass claim reduce your No Claims Bonus?
Your No Claims Bonus (NCB) represents your discount for driving without making at-fault claims on your policy. Under standard UK underwriting rules:
- Comprehensive policies: Glass cover is almost always a standalone benefit. Making a claim through your insurer's approved glass repair partner (such as Autoglass, Auto Windscreens, or National Windscreens) does not reduce your tally of claim-free years.
- Third Party, Fire and Theft (TPFT): TPFT policies rarely include glass cover. If you have a TPFT policy, you must pay for windscreen repairs privately out of pocket.
- Third Party Only: No glass cover is provided under basic third-party cover.
Chip resin repair vs full glass replacement
Insurers and repair technicians strongly prefer repairing small chips with specialized optical resin before they crack:
Comparison of windscreen repair vs replacement
| Factor | Resin Chip Repair | Full Windscreen Replacement |
|---|---|---|
| Damage size | Chips smaller than a £2 coin (approx 25mm). | Cracks, edge damage, or chips exceeding 25mm. |
| Repair time | 20 to 30 minutes. | 1 to 2 hours, plus 1 hour adhesive curing time. |
| Typical excess | £0 to £25 (often waived entirely). | £75 to £150. |
| Structural seal | Original factory windscreen bond preserved. | Windscreen cut out and new glass bonded in. |
| NCB impact | No impact on NCB years. | No impact on NCB years. |
ADAS sensor cameras and recalibration costs
Vehicles manufactured in recent years are equipped with Advanced Driver Assistance Systems (ADAS). These rely on forward-facing optical cameras and LIDAR sensors mounted directly behind the windscreen glass:
- Autonomous Emergency Braking (AEB): Detects pedestrians and sudden braking ahead.
- Lane Departure Warning and Lane Keep Assist: Tracks road markings.
- Traffic Sign Recognition: Reads speed limits and motorway gantries.
When a windscreen is replaced on an ADAS-equipped car, the camera must undergo dynamic or static recalibration with specialised laser target boards. If done through your insurer's approved network, this recalibration is bundled into your glass excess. Paying privately for an ADAS windscreen replacement can exceed £800 to £1,500.
CUE database records and renewal declarations
Even though a glass claim does not deduct years from your NCB, it does not disappear without a trace.
Every windscreen claim is logged by underwriters onto the central Claims and Underwriting Exchange (CUE) database.
- When switching insurers, you must declare any glass claims if the application form asks: "Have you had any accidents, claims, or losses in the last 5 years, regardless of fault?"
- Some automated pricing algorithms apply a very small risk adjustment (typically £5 to £20) at renewal, because statistical data suggests drivers who make glass claims rack up higher motorway mileage.
MOT windscreen rules: Zone A vs Zone B
A chipped windscreen can cause an immediate MOT failure if the damage falls within the driver's direct line of sight:
DVSA MOT windscreen failure criteria
| Area | Definition | Maximum allowable damage limit |
|---|---|---|
| Zone A | A 290mm-wide vertical band centered on the steering wheel within the wiper sweep. | Damage exceeding 10mm causes an MOT FAIL. |
| Zone B (Remainder of swept area) | The rest of the windscreen area swept by the windscreen wipers. | Damage exceeding 40mm causes an MOT FAIL. |
| Outside swept area | Edges and corners not touched by the wiper blades. | Allowed unless structural integrity is compromised. |
Tips for repairing a chipped windscreen
Follow these practical steps if your windscreen takes a stone impact:
- Cover the chip immediately: Place a small piece of clear tape over the chip to keep moisture, dirt, and road grime out of the glass crater.
- Avoid rapid temperature shocks: Do not blast hot air onto a frozen windscreen or pour boiling water on icy glass.
- Call your insurer's dedicated glass line: Most insurers have a 24/7 direct phone line or online portal for glass claims that avoids calling regular accident lines.
- Check replacement glass markings: If replacing glass, ensure the technician installs E-marked OEM-equivalent glass conforming to European safety standards.
Check your MOT history and advisories
Check whether a used car has had historical MOT advisories for windscreen damage, wiper defects, or vision impairment with Caroat's free search tool.
Sources
- DVSA MOT Inspection Manual: Section 3 (Visibility)Driver and Vehicle Standards Agency
- Claims and Underwriting Exchange (CUE) overviewMotor Insurers' Bureau (MIB)
- Understanding your car insurance policy and glass excessAssociation of British Insurers (ABI)
FAQ
Does claiming for a chipped windscreen affect your No Claims Bonus?
On most UK comprehensive car insurance policies, repairing a windscreen chip or replacing glass does not reduce your No Claims Bonus (NCB) years. Standalone glass cover is treated as a separate policy benefit with its own small excess.
What is the typical excess for a windscreen claim in the UK?
Most comprehensive insurers charge a small excess of £10 to £25 for resin chip repairs (and some providers offer chip repairs completely free of excess). If the glass must be completely replaced, the excess is typically between £75 and £150.
Do you have to declare a windscreen claim at insurance renewal?
Yes. When applying for new car insurance or renewing with another insurer, you must answer honestly if asked whether you have made 'any claims, incidents, or losses in the last 5 years', including glass-only claims. Glass claims are logged on the Claims and Underwriting Exchange (CUE) database.
Can a chipped windscreen cause an MOT failure in the UK?
Yes. Under DVSA MOT testing rules, a windscreen chip or crack larger than 10mm in 'Zone A' (the 290mm-wide swept area directly in front of the driver's steering wheel) results in an automatic MOT failure. Chips larger than 40mm anywhere else in the swept wiper area will also cause an MOT fail.
What is ADAS recalibration on modern windscreens?
Modern cars often have front-facing Advanced Driver Assistance Systems (ADAS) cameras mounted behind the rear-view mirror for lane assist and autonomous emergency braking. When replacing a windscreen, these optical sensors must be recalibrated by specialist equipment to ensure safety systems function correctly.