California’s front window tint law is strict: under Vehicle Code Section 26708, any aftermarket film on your front side windows must be clear, colorless, and transparent, and the windshield can only be tinted along a narrow strip at the very top. Traditional dark tint on the front side windows is not legal for ordinary drivers. The only route to darker front tint is a medical exemption, and that comes with its own conditions.
What You Can Put on the Front Side Windows
The baseline rule in Vehicle Code Section 26708.5 prohibits applying any material that reduces visibility or changes the color of your windows.1California Legislative Information. California Code VEH 26708.5 – Transparent Material on Windows Section 26708 then carves out a narrow exception for the front side windows: a clear, colorless, transparent film designed to block ultraviolet A rays.
That film has to clear two separate light-transmission thresholds. The film by itself must pass at least 88 percent of visible light. The finished product — film plus the factory glass underneath — must still pass at least 70 percent, matching Federal Motor Vehicle Safety Standard No. 205.2California Legislative Information. California Code VEH 26708 – Windshields and Mirrors
So when you see tint sold as “70 percent VLT” and advertised as “California legal” for front windows, read carefully. A 70 percent film fails the 88 percent film-only requirement on its own, and once laid over factory glass it will almost certainly push the combined reading below 70 percent. The only legal addition to your front side windows is a nearly invisible UV film. The law also requires you to remove or replace any film that becomes torn, bubbled, or worn in a way that blocks clear vision.
What You Can Put on the Windshield
California allows a tinted strip across the top of the windshield only. Many guides describe it as “the top four inches,” but the statute uses a different measurement. The bottom edge of the tinted strip must sit at least 29 inches above the driver’s seat in its lowest and most rearward position.3California Legislative Information. California Code VEH 26708 – Windshields and Mirrors On most vehicles that lands around the top four to five inches, but the 29-inch rule is what controls.
The strip must be transparent, and it cannot bounce sunlight or headlight glare into other drivers’ eyes any more than bare glass would. Mirror-finish and heavily metallic strips are out. Below that strip, you can apply the same clear, colorless UV film permitted on the front side windows, as long as it meets the same 88 percent and 70 percent transmittance thresholds.
Medical Exemption for Darker Front Tint
If you or a front-seat passenger has a medical condition requiring sun protection, Section 26708(b)(10) allows sun screening devices on the front side windows. These are not standard tint film. They have to be removable, held in place by a frame, temporary fasteners, or a roller shade.4California Legislative Information. California Code VEH 26708.2 – Sun Screening Devices
To qualify, you need a signed letter from a licensed physician and surgeon certifying a medical condition, or from a licensed optometrist certifying a visual condition. The statute names those two professions specifically. Keep the letter in the vehicle at all times.
The devices themselves have to meet the specifications in Section 26708.2. A transparent device must be green, gray, or neutral smoke in color, must transmit at least 35 percent of light, and cannot reflect more than 35 percent on either the inner or outer surface. Non-transparent louver devices must have at least 35 percent open area, with no individual louver exceeding 3/16 inch in projected vertical dimension.4California Legislative Information. California Code VEH 26708.2 – Sun Screening Devices
One rule catches people off guard: you cannot use these screening devices during darkness. If you’re driving at night, they have to come off. That’s part of why the law requires them to be removable rather than permanently installed film.
Certification You Need To Keep in the Vehicle
If you install clear UV film on your front side windows under Section 26708(d), a certificate has to live in the vehicle. When a shop does the installation, that certificate must be signed by the installing company and list both the company and the film’s manufacturer by full name and street address. If you installed the film yourself, the certificate must come from the manufacturer, confirming the product meets California’s requirements when applied per instructions.2California Legislative Information. California Code VEH 26708 – Windshields and Mirrors
Having the paperwork handy matters at a traffic stop. Without it, an officer measuring your front window transmittance has no way to verify that what you’ve applied is a certified, legal product.
What Happens if You Get Pulled Over
A window tint violation is typically treated as a correctable offense. An officer who suspects your front windows are too dark can stop you and use a tint meter to measure the combined light transmittance. If it fails, you’ll usually get a fix-it ticket rather than a standard moving violation.5California Courts. Fix-It Ticket
A fix-it ticket gives you time to correct the problem — remove or replace the non-compliant film — and then show proof of correction to the court. Once that proof is received, you pay a $25 administrative fee and the matter closes. Ignoring the ticket, or failing to actually correct the issue, escalates the cost: the violation converts into a standard infraction with a higher fine.
Repeat stops are where this gets expensive. Each encounter can generate a new ticket, and the $25 resolution only works if you actually peel the film, get the sign-off, and keep the windows legal going forward.
Rear Windows and Commercial Vehicles
The front-window rules don’t carry over to the back of the car. Section 26708 does not restrict tint on any side window behind the driver, so rear passenger windows can go as dark as you want. The rear windshield is also unrestricted, but only if your vehicle has outside mirrors on both sides giving a view of at least 200 feet behind. Without dual side mirrors, you cannot darken the rear windshield.
If you drive a commercial motor vehicle, federal rule 49 CFR 393.60 adds its own 70 percent light transmittance floor for the windshield and front side windows.6eCFR. 49 CFR 393.60 – Glazing in Specified Openings California’s rules still apply on top of that, and since the state already requires 88 percent transmittance for the film itself, meeting California generally means meeting the federal standard too.