A small chip, roughly the size of a quarter or smaller and away from the edge of the glass, can usually be filled with resin for far less than a new windshield, and fixing it early keeps it from spreading. A long crack, damage at the edge, or damage directly in the driver's line of sight usually means replacement. On a newer car with a forward camera, replacement also brings a driver-assistance calibration, which can change both the price and the shop you should pick.
Why a chip becomes a crack
Windshield glass is two layers of glass bonded around a plastic interlayer. A stone strikes the outer layer and leaves a small break, often a bull's-eye, a star, or a half-moon. Dirt and moisture get into that break. Then a hot day, a cold morning, a pothole, or a slammed door adds stress, and the break grows into a crack. Kansas City weather does this regularly, with freezing nights followed by sunny afternoons, and a defroster blasting hot air onto cold glass is a classic trigger.
Loose gravel and road-salt grit on winter roads are common sources (see our road salt guide), as is the debris left after road construction. Following a truck too closely makes strikes more likely, and a severe hailstorm can crack glass outright.
Repair or replace: rules of thumb
There is no single legal or industry cutoff, and shops differ. The figures below are common rules of thumb repeated by glass shops, not a Missouri standard. A technician has to look at the damage in person.
| Situation | Usual outcome | Why |
|---|---|---|
| Single chip smaller than a quarter, clean and fresh | Repair | Resin can fill and stabilize it |
| Two or three small chips, spread apart | Often repair | Depends on how close they are to each other |
| Short crack | Sometimes repair | Many shops set a limit of a few inches |
| Crack longer than a few inches, or running to the edge | Replace | Edge cracks weaken the whole pane |
| Damage in the driver's main field of view | Often replace | A repair can leave a faint blemish or distortion |
| Deep damage reaching the inner layer | Replace | Resin cannot restore the inner layer |
| Damage in front of the camera or sensor area | Ask the carmaker's guidance | A mark in the camera's view may matter |
A repair is mainly about strength and stopping the spread. Expect the break to stay partly visible afterward. If a shop promises that a chip will vanish, be skeptical.
Why speed matters
- Cover a fresh chip with clear tape to keep out dirt and rain until it is repaired.
- Avoid washing the car with high-pressure spray close to the chip.
- Do not blast the defroster at full heat on a frozen windshield. Warm the car gradually.
- Do not wait weeks. A clean chip is easier to fill than one that has collected dirt.
Driving with a cracked windshield
Whether a cracked windshield is a ticket depends on where the damage sits and how much it blocks the driver's view. Secondary sites quote different Missouri measurements for allowed chips and cracks, and we could not match their figures to an official source, so we are not repeating any of them. The practical rule is simple: any damage that interferes with your view, or any crack that keeps growing, is a safety problem whether or not an officer would write it up. The windshield also supports the roof in a rollover and helps the passenger airbag deploy correctly, so a large crack is not only a cosmetic issue. If you are unsure about the current law, ask a shop or check the Missouri Revised Statutes yourself.
Replacement and driver-assistance cameras
Many recent cars mount a camera behind the windshield for lane-keeping, automatic emergency braking, or adaptive cruise control. When the glass is replaced, that camera is removed and refitted, and carmakers commonly call for calibration afterward. Calibration is done with targets and a scan tool in a shop, or sometimes with a road drive at set speeds. A resin chip repair normally does not remove the glass and normally does not require calibration, though damage right in front of the camera is a special case.
Questions to ask before replacement on a newer car:
- Does my vehicle have a forward camera or other sensor behind the glass?
- Will the shop do the calibration, or send it somewhere else?
- Is the glass original-equipment or aftermarket, and does the carmaker accept it for my model?
- Is the calibration printed on the estimate and on the final paperwork?
The same concerns arise after a crash. Our bumper repair guide explains how sensor calibration is handled in body work, and the guide to choosing a shop lists questions to ask about it.
What it costs
Prices vary by vehicle, glass type, and shop. Guides from glass shops commonly cite chip repair somewhere from about $60 to $150 and replacement from a few hundred dollars to about $800 for a standard vehicle, with more once calibration is required. Treat these as typical ranges only and verify with the provider before work starts. The estimate should separate glass, labor, moldings, and calibration.
Insurance and glass claims
Glass damage generally falls under comprehensive coverage, not collision, so your comprehensive deductible usually applies. A few states, including Florida, Kentucky, and South Carolina, require insurers to waive the glass deductible. Sources we checked say Missouri has no such rule, so a windshield claim here normally means paying the deductible written in your policy. Some insurers sell optional glass coverage, and some waive the deductible for a chip repair as a way to head off a larger claim, but this is a company decision, not a legal right.
- Read your policy, or ask your agent, for the comprehensive deductible and any glass endorsement.
- Compare the replacement quote with the deductible. If the quote is close to the deductible, filing may not pay.
- Ask whether a chip repair is covered without a deductible.
- Ask whether a claim for glass affects your premium or renewal.
The general process, including estimates and your right to choose a shop, is covered in our guide to Missouri collision claims. Be careful with door-to-door glass offers after a storm. Get the work order and warranty in writing.
Choosing the repair
A good shop will inspect the damage and explain why it recommends repair or replacement. For replacement, ask about the adhesive and how long you must wait before driving. Adhesives need time to cure, and the shop should give a safe drive-away time for your conditions. After the job, check for wind noise, leaks, loose trim, and any dashboard warning light about driver-assistance systems.
Frequently Asked Questions
Can I drive with a chipped windshield?
Usually yes for a short time if it is small and outside your line of sight, but repair it soon. Temperature swings and road vibration can turn a chip into a crack.
Does a windshield claim raise my insurance rates?
It depends on the insurer and your policy. Glass claims are often treated more lightly than collision claims, but practices differ, so ask your agent before filing.
Does Missouri require zero-deductible glass coverage?
Sources we reviewed say no. Only a few states, such as Florida, Kentucky, and South Carolina, waive the glass deductible by law. In Missouri the deductible in your policy normally applies unless your insurer offers a glass endorsement.
Do I need ADAS calibration after a windshield replacement?
If your car has a camera or sensor mounted at the windshield, the carmaker commonly requires calibration after the glass is replaced. Check the manufacturer's guidance for your model and ask the shop to show the procedure on the invoice.
Can a repaired chip be seen afterward?
Often yes. Repair stops the spread and restores strength, but a faint mark usually remains. A repair that makes the view distorted in front of the driver may be a reason to replace instead.