A windscreen chip does not automatically fail an MOT, but it can do if it is too large, too close to the driver’s line of sight or serious enough to weaken the glass. Placement matters just as much as size.

The short answer

For a quick rule of thumb:

  • small chip outside the main driver view: often passes
  • larger damage in the swept area: much more likely to fail
  • crack spreading across the screen: do not count on passing

Testers are judging whether the damage obstructs vision or leaves the screen in a poor condition.

Why it matters at MOT time

A chip in the wrong place catches the eye every few seconds, scatters headlights at night and can spread into a full crack far faster than people expect. That is why MOT rules do not just look at whether the glass is intact. They look at whether the driver can see clearly and safely.

What to check first

Before the test:

  • inspect the chip from the driver seat, not just from outside the car
  • check whether the damage sits in the main swept area of the wipers
  • look for spreading legs or star cracks
  • make sure the washer and wiper system works properly too
  • if in doubt, ask a windscreen repairer whether a resin repair is still possible

A quick repair is usually far cheaper than a full replacement.

Can you drive it?

If the chip is tiny and stable, the car is often still usable short term. If the crack is spreading, sits in your direct view or has been hit by another cold-hot temperature cycle, get it sorted quickly. Windscreens rarely improve with time.

What it usually costs to sort

A small resin repair is often the cheapest answer and can be done quickly. A full windscreen replacement costs much more, especially on cars with cameras, rain sensors or heated-glass features. That makes early action far cheaper than waiting for a chip to become a full crack.

More on Motoring Mojo

FAQ

Will a tiny windscreen chip fail an MOT?

Not always. Many small chips outside the critical driver-view area pass without issue. The risk rises when the damage is bigger, spreading or placed where it interferes with the driver’s clear view of the road.

Is a repair enough, or do I need a new windscreen?

That depends on the size, depth and location of the damage. Small early chips are often repairable. Once a crack spreads or the damage sits in a poor position, a full replacement becomes more likely.

Can bad wipers or washer issues make the situation worse?

Yes. Poor wipers and weak washers make visibility problems worse and draw more attention to any chip or crack in the swept area. Sorting the whole visibility package before test day is the smarter move.