California Window Tint Law 2026: Legal VLT, AS-1 Line, Exemptions

We get asked about California window tint law every single week at our Belmont shop. There's a lot of bad information online, including wrong percentages and outdated rules. Here's the real 2026 version — in plain English, from a shop that has to install tint that passes inspection across San Mateo County, Santa Clara County, and the rest of the Bay Area.

Note: this is an informational guide, not legal advice. California Vehicle Code §26708 is the authoritative source. If you're doing anything unusual — commercial plate, medical exemption, out-of-state vehicle — confirm with your installer and the CHP.

The core rule: what VLT even means

VLT = Visible Light Transmission, measured as a percentage. A 70% VLT tint lets 70% of visible light through. A 5% ("limo") tint lets only 5% through. Higher percentage = lighter tint = more visibility. Lower = darker.

The California Vehicle Code puts different limits on different windows. Most tint tickets come from people applying limo tint to front side windows, which has been illegal statewide for decades.

California VLT limits — by window, in plain English

Windshield

• No aftermarket tint is permitted on the windshield itself below the AS-1 line (see below).
• A narrow strip of tint at the top, down to the AS-1 line or 4 inches (whichever is shorter), is legal.
• Clear ceramic films that are 88%+ VLT and reject UV/IR can be used on the full windshield — these are technically "tint-like" but fall under a different CVC exception. We install this on Teslas and EVs constantly.

Front side windows (driver + front passenger)

• Must allow more than 70% VLT combined (factory glass + aftermarket film).
• Most OEM front glass is roughly 85–88% VLT, which means an installer has a very narrow window to play in. We typically recommend 70% ceramic film, which lands just legal when measured combined with the factory glass.

Rear side windows and rear windshield

• No VLT limit as long as the vehicle has functional side mirrors on both sides.
• Most SUVs and trucks come from the factory with "privacy glass" on the rear that's already ~20% VLT. Any film added over that goes darker.
• 5%, 15%, 20%, 35% — all legal on the rear in California.

The AS-1 line

Every factory-installed windshield in the US has a small marking etched near the top that reads "AS-1." This is the line below which you can't put dark tint. Only a strip from the top of the windshield down to the AS-1 line (or 4 inches, whichever is shorter) can be tinted darker than 70% VLT.

Medical exemption

California allows a medical exemption for darker front-window tint if you have a qualifying medical condition (lupus, melanoma history, light sensitivity, etc.). To qualify you need:

• A signed letter on a licensed physician's letterhead stating the condition and recommending UV/light protection beyond standard VLT
• Proof of the letter carried in the vehicle — this is what gets shown to an officer
• Installation by a shop that can document the film's VLT

At Auto Xpert we install medical-exemption tint regularly. We keep your paperwork on file and provide a copy for your glovebox.

Commercial vehicles and fleet

Commercial vehicles — vans, service trucks, fleet cars — follow the same VLT rules as passenger vehicles on the front two windows. Commercial glass tinting on a building is a completely different category with different regulations, which we cover on our commercial tinting page.

What actually gets ticketed on Peninsula roads

In our experience working with customers who've been cited, three situations account for ~90% of tint tickets in the Bay Area:

• Limo-dark front windows (5–20% VLT). Almost always the cause. CHP pulls cars over for this constantly on 280 and 101.
• Tint that covers the entire windshield (below the AS-1 line), even if it's not very dark.
• Out-of-state cars with legal-in-their-state tint that fails California's 70% VLT front-window rule. If you drove in from Nevada or Arizona and got your tint there, it's probably too dark for California.

Fine is typically a "fix-it" ticket the first time — $25–$197 depending on the county — with an order to remove the film. Repeat offenses escalate. A non-correctable ticket in some jurisdictions is upwards of $490.

Ceramic vs dyed vs metallic film

The VLT rules above apply regardless of film type. But the film type matters for how much heat and UV you actually block at a given VLT:

• Dyed film — cheapest, blocks the least heat, fades over 3-5 years. Legal if VLT is correct; we rarely install this anymore.
• Carbon film — mid-range, doesn't fade, blocks more heat than dyed.
• Ceramic film — premium. Blocks 50-70% of infrared heat and 99% UV at any VLT. Doesn't interfere with cell signals (metallic film does). Our default at Auto Xpert.

For Bay Area drivers dealing with summer heat on 101 and 280, ceramic film at 70% VLT on the front windows gives you legal darkness plus genuine heat rejection — the same interior temperature benefit as a darker film, but road-legal.

The rules for minors

California does not currently have special VLT rules for drivers under 18 like some other states. Standard CVC §26708 limits apply to every passenger vehicle.

Legal tint installation at Auto Xpert Belmont

We install only CVC-compliant tint unless you provide valid medical exemption paperwork. Every install includes a manufacturer warranty and a sticker placed on the inside of the driver's door jamb that documents the VLT — this is what officers look at when they measure your tint with a photometer. See our window tinting service page or request a quote.

Frequently asked questions

What is the legal tint percentage in California?

Front side windows must allow more than 70% of visible light through (film + factory glass combined). Rear side windows and rear windshield have no VLT limit. The windshield can only be tinted above the AS-1 line.

Can I get a 20% tint on the front windows in California?

No — 20% VLT on the front side windows is illegal under CVC §26708 without a valid medical exemption. You will be ticketed.

Is ceramic tint legal in California?

Yes, as long as the VLT of the installed film meets the legal percentage for each window. Film type (ceramic vs dyed vs carbon) doesn't change the legality.

How do I get a medical exemption for darker tint?

You need a signed letter on a licensed California physician's letterhead stating your qualifying medical condition and recommending UV/light reduction. Keep a copy in the glovebox at all times.

What's the fine for illegal tint in California?

First offense is typically a fix-it ticket ($25–$197) that requires you to remove the film. Subsequent or non-correctable citations can run up to $490 in some counties.

Can I tint my whole windshield?

No. Aftermarket tint below the AS-1 line on the windshield is illegal. The only exception is a clear UV/IR-rejecting ceramic film at 88%+ VLT, which is common on EVs.

Will CHP actually pull me over for tint?

Yes — tint enforcement is active on Bay Area roads, especially 101, 280, and Skyline. Most citations happen during stops for other reasons but we see primary tint stops regularly.