California Window Tint Laws: What's Legal in 2026

At a glance

Short version: the front side windows need at least 70% light transmission, while the back side windows and rear window can go darker.

Window	Rule covered in this post
Front side windows (driver & front passenger)	At least 70% light transmission
Back side windows	Any darkness
Rear window	Any darkness
Tint color	No red, amber, or blue
Reflectivity	Limited (no mirror-like film)

One of the most common questions we get before a tint job is simple: “How dark can I legally go?” Here’s the short version.

Front side windows

California requires at least 70% light transmission on the front two side windows (driver and front passenger). This is the strictest rule in the state and applies to every passenger vehicle.

Back side windows and rear window

Behind the driver, the rules loosen up. Any darkness is legal on the back side windows and the rear window — which is why a lot of sedans and trucks go noticeably darker toward the back.

Reflectivity and color

Tint can’t be red, amber, or blue, and there are limits on how reflective (mirrored) the film can be.

Medical exemptions

Some drivers qualify for a darker front-window exemption for medical reasons. If that applies to you, bring your documentation when you come in and we’ll walk you through it.

Our recommendation

We only install film that’s legal for your specific vehicle and window position, and we’ll explain the numbers before anything goes on the glass. If you’re not sure what you currently have, bring the car in for a free estimate and we’ll check it for you.

Ready for legal tint?

See our window tinting service for film options (in-house, carbon, and ceramic), warranties up to 7 years, and starting prices. Every tint job starts with a free estimate at our Hammer Lane shop in Stockton.