California's New Windshield Law Starts Before the Glass Goes In, Not After

Current as of November 2026.

Most shop owners figure a windshield law is about the install. California's new one isn't. Say Daniel runs a three-bay shop off Holt Boulevard in Ontario. At 5:30 on a Thursday a customer drops off a late-model crossover with a cracked windshield and a camera mounted behind the mirror. The glass goes in Friday, the calibration is booked for Monday, and the car sits on Daniel's lot all weekend. Starting January 1, 2027, the law cares about every step of that timeline. Under the Motor Vehicle Glass Act,

before starting work, a covered shop must notify the customer whether the vehicle has an advanced driver assistance system (ADAS) and, if so, whether calibration or recalibration is needed following a windshield repair or replacement and whether the shop intends to perform that calibration

. The obligations start at the counter, before anyone picks up a tool.

Does SB 988 actually apply to a body shop that also does glass?

It depends on what your business mostly does. A lot of owners have this part wrong in both directions.

As introduced, SB 988 defined a "motor vehicle glass repair shop" broadly

, and

under that language, collision repair facilities replacing vehicle glass as part of broader repairs also would have fallen within the definition.

The final version is narrower.

As amended, SB 988 applies to businesses primarily engaged in automotive glass replacement

.

That doesn't let collision shops ignore it. Trade coverage points out that

the act defines repair or replacement of damaged glass to include calibrating or recalibrating an ADAS when an incident requires damaged glass to be replaced

. If you sublet glass or calibration work, your vendor's compliance becomes part of your customer's experience. The money at stake ranges from a few thousand dollars to redo one job up to six figures if a driver gets hurt relying on a camera that was never confirmed.

Why is a windshield job different at a shop than in someone's driveway?

When a driver swaps their own wiper blades, nobody owes anybody a disclosure. A shop is a licensed business taking custody of someone else's property, and California has stacked duties on that relationship for decades. The Bureau of Automotive Repair points out that

in 1971, the Legislature adopted the Automotive Repair Act

, which already governs estimates and authorization. SB 988 adds a glass-specific layer on top of it.

The new layer has three parts that matter on a busy day. First comes the disclosure up front. Then comes the written result:

glass-focused shops have to tell customers whether ADAS recalibration is needed after windshield work and report the result in writing.

If the calibration doesn't take,

the shop must warn the customer against relying on the ADAS until a certified dealership or qualified specialist completes a successful calibration.

That warning is the line between a documented handoff and a shop that let a car leave with a lane camera nobody could vouch for.

The third part changes how glass work gets paid.

The law bans assignment of benefits on first-party glass claims, requires glass shops to disclose ADAS calibration needs before work begins and bars insurers from misleading, threatening or coercing policyholders over their choice of shop.

Shops that relied on customers signing over their claim rights will have to rebuild that workflow. According to CollisionWeek, the act

carries no urgency clause, so it takes effect Jan. 1, 2027, the same date its assignment-of-benefits ban begins voiding contracts.

Pricing has a ceiling too. Shops can't charge more than

"reasonable and customary" fees and costs for glass repairs or replacement and associated ADAS calibration or recalibration recommended by the vehicle manufacturer.

Owners who follow broader industry coverage trends will recognize this pattern of states tightening glass and ADAS rules.

What does a botched calibration actually cost a shop?

Start with the direct costs. A failed calibration that nobody catches means pulling the car back in and redoing the work, which can run into the thousands on one vehicle once you count the technician's time, a lost bay and a sublet bill. If the driver is hurt in a crash where the driver-assist system misread the road, a claim can climb into the hundreds of thousands. A larger shop with dozens of glass jobs a month carries that exposure dozens of times over.

Then there's the disruption. A disputed job ties up a bay, a manager's afternoon and sometimes a tow.

Regulators are watching documentation closely. One report found that the Bureau of Automotive Repair has disciplined nearly 2,500 dealers since July 2023, and

improper documentation, meaning estimates that were missing, incomplete, or never provided at all, was among the most common violations.

A missing calibration notice after 2027 is easy to picture as the next item on that list. Online reviews add reputation damage on top.

How do I set up the paperwork before January 1, 2027?

Do your risk assessment by job type, not by customer. Pull your last month of work orders and flag every windshield replacement on a vehicle with a forward camera or radar. That's the group the law watches. Then add two fields to your intake form: one recording the ADAS disclosure and one showing whether your shop or a named outside facility will do the calibration. The law expects that, because if a shop won't do the calibration itself, it has to direct the car to

the vehicle manufacturer's certified dealership or a qualified specialist capable of performing the calibration or recalibration.

If you sublet, ask your calibration partner three questions. Do they print a pass or fail result? Do they follow manufacturer procedures for that make? Will they send the report the same day? Autobody News put it plainly:

ask your vendor whether they are trained on and documenting ADAS calibration outcomes in writing.

Shops comparing notes at local events about networking and business protection often find those answers before a dispute forces the question.

What red flags show up when a car stays overnight?

Daniel's crossover is the classic weak spot. The glass is new, the camera isn't calibrated, and the car is sitting outside a building with the lights off. If a staff member moves it Saturday, or the customer picks it up early with a spare key, it could end up on the freeway with a system that has never been checked.

Build a short contingency plan for that gap. Put a visible tag on the dash or mirror saying calibration is pending. Lock the keys away, not on a pegboard. Write a policy that no car with pending calibration leaves without a signed acknowledgment. Watch for gaps between the glass invoice date and the calibration report date in your files, and for vendors whose reports arrive days late. Lighting and cameras on the lot help with theft and vandalism, which are the overnight risks every shop already carries.

Shops that handle rule changes well

The shops that get through a change like this smoothly usually do one dull thing: they treat paperwork as part of the repair, not something tacked on after. A pass or fail line on every glass invoice costs a technician seconds. It also gives the owner a defense, a record to show regulators and a reason for a customer to come back. Owners focused on a growing shop's protection tend to see that prevention pays for itself the first time a job gets questioned.

Something you can do this week

Print one blank copy of your current windshield work order. Sit down with your service writer and mark where the ADAS disclosure, the calibration plan, the pass or fail result and the overnight acknowledgment would go. If a box doesn't exist, draw it in by hand. That marked-up sheet becomes the draft of your 2027 form, and the job takes about an hour.

Common Questions

When does California's Motor Vehicle Glass Act take effect?

It takes effect January 1, 2027. Gov. Newsom signed SB 988 on Sept. 27, 2026, and because it has no urgency clause, it starts on the first day of the new year. The ban on assignment of benefits begins voiding contracts that same day.

Does SB 988 apply to collision repair shops?

The final version mostly applies to businesses primarily engaged in automotive glass replacement. The law's definition of glass repair still includes ADAS calibration tied to glass replacement, so collision shops that do or sublet that work should read the enrolled text closely and line up their paperwork with their vendors.

What has to be in the written ADAS calibration notice?

If a calibration is performed, the shop has to tell the customer in writing whether it was successful. If it wasn't, the shop has to warn the customer not to rely on the system until a certified dealership or qualified specialist completes a successful calibration.

Can a customer still sign over their glass claim to my shop in California?

Not after January 1, 2027. The act bars people with policies covering windshield and calibration work from assigning their policy rights or benefits to another party, before or after a loss. Shops that used assignment forms will have to change how they bill those jobs.

Protecting Your Shop and Your Customers' Cars With the Right Coverage

A new glass law doesn't change the fact that your shop holds other people's cars overnight and stands behind every calibration it signs. At Farmers Insurance - Young Douglas, our agents walk through your shop's actual workflow with you, from the intake counter to the overnight lot, and look at how general liability, commercial property, business interruption and umbrella liability may fit, depending on your policy. If you sublet calibration or keep customer vehicles after hours, we can help you see where your current insurance may or may not respond to a disputed job or a damaged car. When you're ready, we're glad to review your current coverage.

Sources:

• Autobody News. "California Enacts Motor Vehicle Glass Act." Autobody News, Sept. 2026. autobodynews.com/news/california-enacts-motor-vehicle-glass-act
• CollisionWeek. "Newsom Signs California Motor Vehicle Glass Act, Setting ADAS Calibration and Glass Claim Rules." CollisionWeek, 29 Sept. 2026. collisionweek.com/2026/09/29/newsom-signs-california-motor-vehicle-glass-act-setting-adas-calibration-glass-claim-rules/
• Bureau of Automotive Repair. "Notice of Proposed Action: Estimate Requirements for Automotive Repair Dealers." California Bureau of Automotive Repair, 2024. bar.ca.gov/pdf/regulatory-actions/tear-down-2024/notice.pdf

DISCLOSURE: This article may feature independent professionals and businesses for informational purposes. Farmers Insurance - Young Douglas collaborates with some of the professionals mentioned; however, no payment or compensation is provided for inclusion in this content.