California Law on Tinted Windows: Exemptions, Certificate, and Penalties

California window tint law bans dark aftermarket film on your windshield and front side windows, allows any level of darkness on the windows behind the driver, and treats violations as fix-it tickets. The rules live in Vehicle Code Sections 26708 and 26708.5, and they turn on which window you’re modifying.¹

The starting point is a blanket prohibition on any material that obstructs or reduces your clear view through the windshield, front side windows, or rear windows, and CVC 26708.5 separately bans transparent material that alters the color or reduces the light transmittance of any window. Every legal tint option in California is a specific exception carved out of that default.¹

Windshield Tint

You can put a non-reflective transparent strip along the top of the windshield. The legal measurement is not “the top four inches,” even though that’s how most people describe it. The bottom edge of the strip must sit at least 29 inches above the driver’s seat in its lowest and rearmost position, measured from a point five inches in front of the backrest. On most sedans that lands around the top four to five inches of glass, but it varies by vehicle.²

The strip material cannot be red or amber, cannot carry opaque lettering, and cannot reflect sunlight or headlight glare into other drivers’ eyes more than the bare glass would.²

Front Side Windows

This is where California catches most drivers off guard. No dark or colored film is permitted on the driver’s or front passenger’s window. The only aftermarket film allowed is clear, colorless, and transparent material designed to block ultraviolet-A rays.²

That clear UV film has to meet two light-transmission thresholds. The film itself needs a minimum visible light transmittance (VLT) of 88 percent. Once applied over the factory glass, the combined VLT of the window still has to meet the 70-percent minimum required by Federal Motor Vehicle Safety Standard No. 205.³ Properly installed clear UV film is nearly invisible. If you can see noticeable darkening on your front side windows, the film almost certainly fails the standard.

The film also has to be removed or replaced if it tears, bubbles, or wears down enough to impair vision through the glass.²

Rear Side Windows and the Rear Window

Glass behind the driver is where California gets permissive. The side windows to the rear of the driver’s position are exempt from the general prohibition, so any level of darkness is legal on those panes.²

The rear window works the same way with one condition. Your vehicle must have functional side mirrors on both the left and right that show at least 200 feet of road behind the car. With those mirrors, any tint level on the rear window is legal. Nearly every factory passenger vehicle already meets this.²

Colors and Reflectivity

Color rules track the window. The windshield strip specifically cannot be red or amber. Front side window film has to be clear, colorless, and transparent, which rules out blue, green, and smoke shades along with everything else that isn’t clear.²

On reflectivity, the windshield strip cannot reflect more than the bare glass. Sun screening devices used under a medical exemption are capped at 35 percent reflectivity on both the inner and outer surface.⁴

Medical Exemptions

California has two separate medical pathways, and they do different things.

Removable Sun Screening Devices

You can install a removable sun screening device on the front side windows if you or a front-seat passenger carries a letter signed by a licensed physician and surgeon, for a medical condition, or by a licensed optometrist, for a visual condition, stating the person needs to be shaded from the sun.² The device must be readily removable, and if it uses transparent material, the color is limited to green, gray, or neutral smoke with at least 35 percent light transmittance.⁴

One important limit: the device cannot be used during darkness. Driving at night with a sun screening device still attached puts you in violation regardless of your paperwork.²

Clear UV-Blocking Film for UV Sensitivity

The second pathway is narrower than it sounds. With a certificate signed by a licensed dermatologist stating you should not be exposed to ultraviolet rays because of a medical condition, you can apply clear, colorless, transparent UV-blocking film to the windshield, side windows, or rear windows. The film still has to meet the 88-percent VLT and 70-percent combined transmission standards.³ This exemption does not authorize dark tint on front windows. It lets you add UV protection to glass where no film would otherwise be allowed, like the windshield below the strip line.

The Certificate You Need to Keep in the Car

If you install clear UV film on the front side windows under subdivision (d) of CVC 26708, the law requires documentation. The installing company must give you a signed certificate confirming the film meets the legal requirements, and that certificate must include the full name and street address of both the installer and the film’s manufacturer.²

If you install the film yourself, you need a manufacturer-signed certificate instead, confirming the material meets the statutory requirements when installed per instructions.³ Keep it in the vehicle. At a traffic stop, it’s the quickest way to show the film is legal.

Penalties

A tint violation is usually a fix-it ticket, formally a notice to correct a violation. You remove or replace the non-compliant film, get the correction verified by a law enforcement officer, and pay a $25 dismissal fee per violation.⁵

Ignore the ticket or fail to show proof of correction and you lose the reduced fee, owing the full bail amount, which can reach several hundred dollars. Repeated violations or continued non-compliance can escalate to a mandatory court appearance. You’re also still paying to remove the illegal film and, if you want tint at all, to reinstall something compliant, so the total cost of letting a fix-it ticket slide climbs quickly.

1
California Legislative Information. California Code VEH 26708.5 – Tinted Safety Glass
2
California Legislative Information. California Code VEH 26708 – Material Obstructing or Reducing Driver’s View
3
California Legislative Information. California Code VEH 26708 – Material Obstructing or Reducing Driver’s View
4
California Legislative Information. California Code VEH 26708.2 – Sun Screening Devices
5
California Courts. Fix-It Ticket