Washington window tint laws set a 24% VLT minimum on front side windows for passenger cars. Non compliant tint installed for pay can trigger a gross misdemeanor under Code Section 46.37.435. SUVs, trucks, and vans may use unlimited darkness on rear windows if dual mirrors are fitted. This guide covers VLT limits, prohibited colors, penalties, and medical exemptions. The primary source is Washington state law.
Key Terms Defined
Visible Light Transmission, commonly called VLT, measures the percentage of light that passes through glass and film combined. A lower VLT number means a darker tint. Net VLT is the true reading a tint meter shows once film is applied to factory glass. Sunscreening material is the statute term for any film or coloring added to vehicle glazing, defined under Washington RCW 46.37.430 safety glazing and sunscreening law.
What the Law Says
Washington law sets separate VLT rules depending on the window position and the type of vehicle. The rules distinguish between the windshield, front side windows, and rear windows, and they treat passenger cars differently from SUVs, trucks, and vans. Every rule below comes directly from Washington RCW 46.37.430 safety glazing and sunscreening law, which remains the controlling statute for tint darkness and finish across the state.
Front Side Windows
Front side windows on every vehicle type must allow at least 24% VLT through the glass and film together. This limit applies equally to passenger cars, SUVs, trucks, and vans, with no separate allowance for larger vehicles on this window. A reading below 24% at this position is a violation regardless of vehicle class. This is the figure most drivers mean when asking what tint percentage is legal.
Back Side Windows and Rear Window
Back side windows and the rear window follow different rules depending on vehicle type. Passenger cars must maintain the same 24% VLT minimum used on front side windows for these rear positions. SUVs, trucks, and vans are allowed unlimited tint darkness on back side windows and the rear window, with no minimum VLT requirement, as long as dual outside mirrors are properly installed on the vehicle.
Windshield
Washington restricts tint on windshields to a narrow strip above the AS-1 line, the manufacturer marked line near the top of the glass. Tint applied below the AS-1 line onto the main windshield surface is not permitted under the statute. This visor strip allowance exists to reduce glare from direct sunlight without obstructing the driver’s primary forward field of vision through the rest of the windshield.
Prohibited Colors and Finishes
Washington law prohibits red, yellow, and gold tint colors on any vehicle window regardless of VLT percentage. Black tint is also restricted under the statute’s color provisions. Reflective or mirrored finishes are banned statewide, meaning metallic or mirror like film cannot be used even if the underlying VLT percentage would otherwise comply. These color and finish rules apply independently of the numeric VLT limits described for each window position above.
Who It Applies To
Washington’s tint rules apply differently depending on whether a vehicle is a passenger car, a larger personal vehicle, or a commercial motor vehicle governed by federal rules. Understanding which category a vehicle falls into determines which VLT standard controls. The state standard and federal standard are not interchangeable, and applying the wrong one can leave a vehicle out of compliance even if the owner believed the tint was legal.
Passenger Vehicles
Passenger vehicles, including sedans, coupes, and standard cars, must meet the 24% VLT minimum on both front and rear side windows under Code Section 46.37.430. There is no exception for rear windows on this vehicle class, unlike the allowance given to larger vehicles. The rear window itself also carries the same 24% VLT floor for passenger cars, making this the strictest vehicle category under Washington’s tint framework.
SUVs, Trucks, and Vans
SUVs, trucks, and vans receive an expanded allowance on rear side windows and the rear window, permitting any VLT darkness including fully opaque film. This exemption exists on the condition that the vehicle has dual outside mirrors mounted on both sides. Front side windows for these vehicle types still follow the standard 24% VLT minimum, so the expanded allowance applies only to the rear positions and not the front.
Commercial Motor Vehicles (Federal Standard)
Commercial motor vehicles are governed by a separate federal standard rather than Washington’s 24% state rule. Under Federal Motor Carrier glazing standard 49 CFR 393.60, windshields and windows next to the driver must allow at least 70% light transmittance. This federal minimum is stricter than the state standard, so commercial owners applying the 24% figure to these positions would violate federal law.
Requirements or Elements
Beyond the VLT percentages themselves, Washington law includes a calculation method, a mirror requirement, and a documentation framework that drivers and installers must understand. These requirements often explain why a film advertised at one percentage produces a different reading once it is actually installed on a vehicle. The following subsections cover net VLT math, the dual mirror rule, and certification expectations under the statute.
Net VLT Calculation Explained
Factory glass already blocks a portion of light before any film is applied, so the final VLT reading equals the glass percentage multiplied by the film percentage, not the film rating alone. For example, factory glass rated at 80% VLT combined with film rated at 35% VLT produces a net reading near 28%. This is why film marketed as 35% can measure below Washington’s 24% floor once installed.
Dual Mirror Requirement
Any SUV, truck, or van using the unlimited rear tint allowance must have dual outside mirrors mounted on both the driver and passenger sides. This requirement exists so drivers retain a clear rear field of view even when rear visibility is fully obscured by dark film. A vehicle missing one required mirror would not qualify for the expanded allowance under Washington RCW 46.37.430 safety glazing and sunscreening law.
Certification and Documentation
Washington’s statute includes a certification framework tied to sunscreening materials applied within restricted areas of a vehicle’s glazing system. Some sources online claim no sticker is required, but this claim is not clearly supported across the full statute text, so drivers should not assume documentation is unnecessary. The safest approach is confirming current certification expectations with the installer or the Washington State Patrol vehicle equipment requirements page.
Penalties or Consequences
Washington treats driving with illegal tint differently from installing or selling illegal tint, and the two carry very different levels of legal exposure. This distinction is frequently confused in general discussions of the law, so understanding which statute applies to which situation matters for both drivers and installers. The two categories are addressed separately under different sections of the Revised Code of Washington.
Traffic Infraction for Driving with Illegal Tint
A driver operating a vehicle with tint below the 24% VLT minimum, or with a prohibited color or reflective finish, may be cited for a traffic infraction. This is a non criminal citation similar to other equipment violations, and the fine is approximate since it can vary by jurisdiction. Fines are typically reported between $124 and $136, though a driver should verify current amounts with the citing court.
Gross Misdemeanor for Unlawful Installation or Sale
Installing or selling non compliant sunscreening material for pay is treated far more seriously under Washington RCW 46.37.435 unlawful tint installation penalty, which classifies this conduct as a gross misdemeanor. A person who knowingly installs illegal tint without payment may still face a misdemeanor charge under the same statute. Both the installer and the paying customer can be held responsible for the violation.
Exceptions and Limitations
Washington law recognizes a small number of exceptions to the standard VLT limits, primarily for medical necessity and for specific vehicle categories used in commercial or ceremonial service. These exceptions do not eliminate the underlying rules entirely but instead create documented pathways around them for drivers and vehicle owners who qualify. The following subsections describe how each exception functions under the statute.
Medical Exemptions
A medical exemption for window tint requires a signed statement from a licensed physician documenting the medical need for darker tint than the standard VLT allows. This exemption is not a state issued permit and does not require filing with the Department of Licensing, contrary to a common assumption. The physician statement functions as the exemption document, and drivers should keep it available for verification during a stop.
Hearses, Limousines, and Emergency Vehicles
Washington’s tint statute includes exemptions for specific vehicle categories including hearses, limousines, and certain emergency vehicles. These vehicle types are treated differently from standard passenger cars and SUVs under Washington RCW 46.37.430 safety glazing and sunscreening law, reflecting their specialized use rather than everyday personal transportation. The exemption structure recognizes that these vehicles serve functions where standard VLT limits may not be appropriate or necessary.
Common Misconceptions
Many drivers assume all tint violations lead to the same fine, but Washington law separates driving with illegal tint from installing it for pay, with the installation offense carrying criminal exposure. Another common misconception involves the sticker requirement, where some sources claim no certification is needed despite the statute’s layered framework. Drivers also frequently misunderstand net VLT, expecting a film’s advertised percentage to match the final meter reading once installed.
Laws and enforcement may change, so drivers should check official state sources for the latest rules rather than relying solely on general guides. Consulting a licensed attorney in your state remains the appropriate step for any situation involving a citation or compliance dispute. Readers can review the Disclaimer below for how Lawwalls covers legal topics without offering legal representation or personalized advice for any specific circumstance.
Disclaimer
This article is for general informational purposes only. It is not legal advice. Lawwalls publishes informational content only and does not provide legal services or legal advice.
For legal advice about your specific situation contact a licensed attorney in your state. Laws change and vary by jurisdiction. Verify current rules with official government sources or a qualified lawyer.