California Tint Law
California is stricter on front windows than almost anyone expects, and a lot of the tint on the road here would not pass. Here is where the line sits.
The short answer. In California, rear side windows and the back window can be as dark as you like. The front side windows are the strict part: aftermarket film there must be clear or very light, and the combined result of glass plus film has to let through at least 70 percent of visible light. The windshield gets a strip along the top four inches and nothing more. If a shop offers to put 20 percent film on your front doors, they are offering to install something that does not comply.
Window by window
The rules live in California Vehicle Code section 26708 and the sections around it. Broken down by glass, it works out like this.
| Glass | What is allowed |
|---|---|
| Windshield | A strip along the top four inches only. It must not be red, amber or blue. |
| Front side windows | Clear or very light film only. Glass and film combined must transmit 70 percent or more of visible light. |
| Rear side windows | Any darkness. |
| Rear window | Any darkness, provided the car has working mirrors on both sides. |
| Reflectivity | Film must not be more reflective than standard window glass. |
| Colours | Red, amber and blue are not permitted on the windshield or front side windows. |
This is a plain-language summary for drivers, not legal advice. Vehicle codes are amended, and enforcement varies. Check the current text of California Vehicle Code 26708 or ask us to show you where your car sits before you commit to a shade.
The part people get wrong
This is the single most misunderstood number in California tinting, and it costs people money.
The requirement is that light transmission through the finished window, glass and film together, is at least 70 percent. Factory automotive glass is not perfectly clear. Most front door glass already transmits somewhere in the high seventies to around eighty percent before anything is applied to it.
So the film itself has to be considerably lighter than 70 percent to leave you compliant once it is on the glass. A film sold as “70 percent” applied to glass that already sits at 78 percent does not give you 70 percent. It gives you the two multiplied together, which lands you under the limit.
The practical consequence is that legal front window film in California is nearly invisible. If you can look at a car and clearly see that the front doors are tinted, there is a good chance those windows are not compliant.
Why anyone bothers
If legal front film is almost invisible, the obvious question is why bother at all. The answer is that darkness and heat rejection are different properties, which we covered in detail in ceramic versus carbon window tint.
A high transmission ceramic film lets through the visible light the law cares about while still rejecting a large share of the infrared that carries heat, and blocking essentially all of the UV. You get the cooler cabin and the protection for your interior and your skin, and you stay on the right side of the code, because the film is not doing its work by being dark.
That is the honest route for anyone who wants their front windows to help with an inland Orange County summer without collecting tickets. It costs more per square foot than dark carbon film. It is also the only version of front window tint that is both useful and legal here.
Exceptions
California does provide for a medical exemption, for conditions where sunlight exposure is a genuine problem. Lupus, certain photosensitivity disorders and some skin conditions are the usual grounds.
It is not informal. You need signed documentation from a licensed physician, surgeon, optometrist or dermatologist, and you have to keep it in the vehicle so it can be produced if you are stopped. The exemption attaches to the person and the documentation, not to the car, and it does not extend to the windshield below the permitted strip.
If you think you qualify, get the paperwork before the film goes on rather than after. We will fit to whatever your documentation supports, but the documentation has to exist first.
If you get pulled over
Illegal tint in California is normally written as a correctable violation, the kind people call a fix-it ticket. You remove the film, get the correction signed off, pay the administrative fee and it goes away.
The part worth knowing is that the correction means removing the film, not darkening it slightly less. If you paid for dark front film and then have to strip it, you have paid twice and ended up with clear glass. That is the actual cost of going too dark, and it is why we would rather tell you where the line is before we start than sell you something you take off in six months.
Enforcement is also not uniform. Some drivers run illegal front tint for years without being stopped. Others get written up in the first month. That variability is exactly why it is a gamble rather than a plan.
Before you book
Front side windows must transmit at least 70 percent of visible light with the film applied, which in practice means clear or near-clear film. Rear side windows and the rear window have no darkness limit. The windshield is limited to a strip along the top four inches.
Yes, but only with high transmission film. A quality clear or near-clear ceramic film can reject a lot of heat and essentially all UV while still meeting the 70 percent requirement. What you cannot legally do is put a visibly dark film on the front doors.
As dark as you want, including limo tint, provided the vehicle has functioning mirrors on both sides. The restrictions in California are aimed at the front of the car, not the back.
On the rear side windows and rear window, yes. On the front side windows, no. Neither comes close to the 70 percent transmission requirement that applies to the front doors.
Yes, if there is existing film. New film has to bond to clean glass, and old dyed film that has gone purple or started bubbling has to come off first. It takes time and we will tell you up front if your car needs it.
Bring the car by the shop in Westminster and we will fit it to the legal limit and tell you exactly what that looks like before anything goes on the glass.
OC Tint & Detail · 14191 Beach Blvd Suite #A, Westminster, CA 92683
(657) 400-9300
