Legal Window Tint in Washington State: What Drivers Need to Know

Window tint is one of the most popular vehicle upgrades — it reduces glare, blocks UV rays, and adds privacy. But Washington State has specific rules about how dark and reflective that tint can be, and those rules vary depending on which window you're tinting and what type of vehicle you drive. Getting it wrong can mean a fix-it ticket, a failed inspection, or being asked to remove the film entirely.

Here's how Washington's tint law works and what shapes your outcome.

How Window Tint Law Works in Washington State

Washington regulates window tint under RCW 46.37.430, which sets limits on visible light transmittance (VLT) — the percentage of light that passes through your window and film combined. A higher VLT percentage means more light gets through (lighter tint). A lower percentage means less light passes (darker tint).

The law distinguishes between sedans (passenger cars) and SUVs/vans/trucks, and it treats each window differently.

Washington Tint Rules by Vehicle Type and Window

Sedans (Passenger Cars)

SUVs, Vans, and Trucks

The critical difference: SUVs, vans, and trucks have more flexibility on rear-seat and cargo-area windows. Once you're behind the driver, darkness restrictions largely disappear for those vehicle types.

Reflectivity Rules

Washington also limits how reflective tint can be. Metallic or mirrored films that reflect light away are subject to a separate standard — tint on any window cannot be more than 35% reflective. This applies to both front and rear windows across all vehicle types.

Highly reflective tint creates visibility problems for other drivers and law enforcement, which is why many states, including Washington, treat reflectivity as a separate measurement from darkness.

The Windshield: A Hard Limit 🪟

No matter what vehicle you drive, you cannot tint your entire windshield in Washington. The only permitted windshield tint is a non-reflective strip along the top 6 inches — sometimes called an "eyebrow" or visor strip. This rule is firm and applies universally.

Some vehicles come from the factory with a slight tint already built into the glass. That factory tint counts toward your VLT measurement if you add aftermarket film on top of it.

What the 24% Rule Actually Means in Practice

When Washington says front side windows must allow "more than 24% VLT," it's talking about the combined VLT of your glass and film together.

Most factory automotive glass already transmits around 70–80% of light. If you apply a film rated at 35% VLT on top of glass that transmits 75%, the combined result is roughly 26% — just above the legal threshold. Go darker with the film and you may slip below it.

This is why it's important to:

• Know your factory glass's existing VLT
• Choose film that accounts for that starting point
• Work with an installer who measures the combined result, not just the film spec

Tint Certificates and Sticker Requirements

Washington does not require a sticker identifying legal tint (unlike some states that mandate a sticker between the film and glass on the driver's side door jamb). However, some installers provide a certificate of compliance, which can be useful if you're ever pulled over and need to demonstrate your tint is within legal limits.

Keeping documentation from your installer — including the film's VLT rating and installation date — is a practical step, especially if you're adding tint near the legal edge.

Medical Exemptions

Washington does allow medical exemptions for darker tint. If a driver or regular passenger has a medical condition that requires reduced sun exposure — certain photosensitivity disorders, lupus, or other documented conditions — they may apply for a waiver through the Washington State Patrol that permits darker film than the standard limits allow.

The exemption process requires documentation from a licensed physician and approval before installation. Driving with unapproved dark tint and claiming a medical need after the fact does not satisfy the law.

Enforcement and Penalties

Window tint violations in Washington are typically treated as equipment violations — meaning an officer can pull you over and issue a citation or a fix-it ticket requiring you to bring the vehicle into compliance. In some cases, particularly with severely dark front windows, citations can carry fines.

Law enforcement typically uses a tint meter to measure VLT on the spot. Officers cannot judge a percentage by eye alone, but they can initiate a stop if tint appears excessive.

What Shapes Your Actual Outcome

Whether your tint is legal in Washington — and whether you'll have problems with it — depends on several factors:

• Vehicle type: SUV/van/truck owners have more rear-window flexibility than sedan drivers
• Which windows you're tinting and in what combination
• Your factory glass's existing VLT, which affects the combined measurement
• Film quality and accuracy: cheap film may not match its labeled VLT rating
• Installer calibration: whether combined VLT is measured after installation
• Whether you have a medical exemption and proper documentation

The rules are consistent statewide — Washington doesn't have county-level tint variations — but how they apply to your vehicle depends entirely on the glass you're starting with and the film you're putting on it.