California Window Tint Law — What You Can Actually Put on Your Glass
· Updated
Most tint questions in Sacramento are really one question: how dark can I go without getting a ticket. Here is the answer, without the hedging.
On a California passenger vehicle, aftermarket film on the front side windows must let at least 70% of light through. The windshield may carry a tint strip on the top four inches. Rear side windows and the rear window can be any darkness. Red and amber film is prohibited, and mirrored or metallic-looking film is restricted on the front sides.
The limits, glass by glass
| Glass | What California allows |
|---|---|
| Windshield | A tint strip on the top four inches. Nothing across the driver's field of view. |
| Front side windows | At least 70% VLT — light film only. |
| Rear side windows | Any darkness. |
| Rear window | Any darkness, provided the vehicle has both side mirrors. |
Two rules people miss:
- No red or amber tint anywhere. The color itself is prohibited, regardless of darkness.
- Mirrored and metallic-looking film is restricted on the front sides. The chrome look that is legal in some states is not a safe bet here.
And the mirror rule cuts both ways: if the view through your rear window is obstructed — by dark film, a perforated window graphic, or cargo — California requires the vehicle to have both a left and a right side mirror. Most trucks and vans already do. Check before you cover the back glass.
What "70% VLT" actually means on your car
VLT is visible light transmission — the share of light that gets through. Lower number, darker glass.
The catch is that it applies to the finished window, not to the film. Factory glass is not perfectly clear; most cars leave the plant with front side glass somewhere in the high 70s or low 80s. Put a 70% film on 80% glass and the combined result lands below the legal line.
This is the single most common way a well-intentioned tint job becomes a ticket. A shop that tints to the legal number measures the glass first. Ask whether they do.
What a ticket actually costs
An illegal-tint stop in California is usually written as a fix-it ticket — a correctable violation. You remove the film, get the correction signed off, pay the dismissal fee, and it goes away. That is the good case, and it still costs you the removal, the fee, and a morning.
The worse case is that it is not your only citation, or the film is on a vehicle that gets stopped often. Repeat correction notices on the same equipment stop being cheap.
It is worth being precise here: fine amounts vary by county and by how the citation is written, so anyone quoting you an exact dollar figure for the whole state is guessing. Treat the removal cost and the wasted time as the real price.
The medical exemption
California allows darker front-window film for a documented medical reason. The mechanism is a signed letter from a licensed physician, surgeon, or optometrist stating that the driver needs to be shielded from the sun, kept in the vehicle and produced on request.
Two things to know before you count on it. It covers conditions like lupus, photosensitivity, and certain skin disorders — it is not a workaround for wanting darker glass. And the exemption does not extend to the windshield beyond the normal strip.
If sun exposure is genuinely the reason you are tinting, talk to your doctor first, then bring the letter to the shop. We will install to what the letter supports.
The part that changes the whole decision
If you are tinting to stay cool — and in Sacramento almost everyone is — the legal limit matters much less than people assume.
Darkness and heat rejection are two different numbers. VLT is how dark it looks; TSER, total solar energy rejected, is how much of the sun's energy the film keeps out. A quality ceramic film at a legal 70% shade can reject far more heat than a cheap dyed film at an illegal 20%.
So the honest advice is: stop shopping for darkness. Shop for the film's TSER, keep the front glass legal, and go as dark as you like on the rear where the law does not care. You get a cooler car and no fix-it ticket.
Frequently asked questions
Is 20% tint legal in California?
Not on the front side windows — those must transmit at least 70% of light. On the rear side windows and rear window, 20% is fine. This is why so many California cars run light front glass and dark rear glass.
Is limo tint legal in California?
On the back glass and rear side windows, yes. On the front sides, no. Ordinary passenger vehicles get no exemption for it, regardless of what the vehicle is used for.
Does factory-tinted glass count against the limit?
Factory privacy glass in the rear is fine at any darkness, since the rear has no limit. Up front, the factory glass is part of the measurement — the finished window has to hit 70%, glass and film combined.
Can I tint the whole windshield?
No. Only a strip on the top four inches. Full-windshield film, including the nearly clear heat-rejecting kind sold in other states, is not legal on a California passenger vehicle.
What happens if I move to California with legal tint from another state?
The vehicle has to meet California law once it is registered here. Arizona and Nevada allow much darker front glass, so cars coming from either state very often need the front film removed.
Will you install tint that is not legal?
No. We install to the legal shade, and we would rather explain why than hand you a ticket. The good news is that with ceramic film you do not need illegal darkness to get a cool cabin — see ceramic window tint.
This guide describes California vehicle tint rules as we apply them in our shop. Enforcement details and fine amounts vary by county, and the law can change — confirm current limits with the DMV or CHP if you need certainty for a specific situation.
Want tint that is both legal and genuinely cool? Get a free estimate or call (916) 532-1891.