California is one of the strictest states in the country for window film: front side windows must let at least 70% of light through, and the windshield allows only a colorless, non-reflective strip above the AS-1 line. Back side windows and the rear window can be any darkness, but only if the vehicle has outside mirrors on both sides. This is set by California Vehicle Code 26708.
California VLT limits by window
- Front side windows (driver + front passenger): must allow at least 70% VLT. Because factory glass already blocks some light on its own, aftermarket film generally needs to be rated well above 70% — often 85-88%+ — to still measure 70% net on the car.
- Back side windows and rear window: any darkness is legal, but only with outside mirrors on both sides of the vehicle.
- Windshield: a non-reflective, colorless strip only, limited to the top 4 inches above the AS-1 line. Reflective or colored windshield film isn't permitted at any darkness.
- Color and reflectivity: tint must be non-reflective and colorless across all windows — no red, amber, blue, or mirrored finishes.
Medical exemptions
California allows a medical exemption under Vehicle Code 26708.2 for conditions such as photophobia, lupus, porphyria, and severe drug photosensitivity, including the rare condition xeroderma pigmentosum. The core requirement is a signed certificate from a licensed physician or optometrist describing the condition and the recommended tint; some documentation paths also reference a DMV medical exemption form. The certificate — or DMV authorization, where one is issued — has to stay in the vehicle.
Enforcement and penalties
Illegal window tint in California is an infraction with a base fine around $25, which typically runs $100-$200 once court assessments are added. Officers use a handheld meter to check VLT at a stop.
What this means when you're quoting a job
California's 70% floor means even the lightest film most other states sell as a "barely there" option can be illegal up front on a California car once you account for factory glass — a shop quoting by the film's printed rating alone, without checking the glass underneath, is the most common way an installer accidentally puts illegal tint on a customer's front windows here. A window tint shop software tool that flags a California front-window quote before it's darker than the net 70% floor protects both the shop and the customer.
Frequently asked questions
What is the darkest legal tint in California? Front side windows must allow at least 70% VLT. Back side windows and the rear window can be any darkness with outside mirrors on both sides.
Is 35% tint legal on front windows in California? No. California's front-side-window floor is 70% VLT — much stricter than the 35% common in many other states.
Can I get colored or mirrored tint in California? No. California requires non-reflective, colorless tint across all windows, including the windshield strip.
How do I get a medical tint exemption in California? A signed certificate from a licensed physician or optometrist documenting the qualifying condition, kept in the vehicle; some paths also involve a DMV medical exemption form.
What's the fine for illegal tint in California? A base infraction fine around $25, commonly $100-$200 total once court fees are added.
This is general information based on California's public statutes and reporting on Vehicle Code 26708, not legal advice — enforcement can vary and laws change over time, so confirm specifics with the California DMV or a licensed attorney before you install, buy, or contest a citation.
Related
- State-by-state window tint laws (VLT limits) - California shop market + VLT summary - Window tint percentages: what VLT, 5%, 20%, 35% mean - Ceramic vs carbon vs dyed tint: pricing each tier