Tint Laws in Washington: Complete Guide

Tint laws in Washington generally require at least 24% visible light transmission (VLT) on vehicle windows other than the windshield and limit applicable film reflectance to 35%. Qualifying vehicles may use darker film behind the driver if they meet the statutory conditions. RCW 46.37.430 also regulates windshield film, mirror visibility, medical exemptions, and installation requirements.

Understanding Window Tint Laws in Washington State (RCW 46.37.430)

Tint laws in Washington are established primarily under RCW 46.37.430. The statute regulates aftermarket film light transmission, reflectance, placement, and installation. The general rule requires at least 24% light transmission and no more than 35% reflectance on vehicle windows other than the windshield, subject to statutory exceptions.

Washington also restricts the number and types of film layers that may be applied. The law prohibits installing more than one sheet of aftermarket sun-screening film on a window and identifies specific colors and finishes that are not permitted. Certain vehicle categories may use darker film on windows behind the driver if the statutory conditions are met.

Drivers in Everett, Seattle, and other Washington communities should check their vehicle classification and the position of each window before selecting a tint shade. A vehicle's appearance alone does not establish whether it qualifies for a rear-window exception.

The statute also defines net film screening to account for material applied by the vehicle manufacturer and aftermarket film installed later. Drivers should consider the combined characteristics of the original glass and aftermarket film rather than relying solely on the percentage printed on the film packaging.

What Is VLT (Visible Light Transmission)?

Visible light transmission (VLT) is the percentage of visible light that passes through a vehicle window. A higher VLT percentage means more light passes through the glass, while a lower percentage indicates darker glazing.

Washington law defines light transmission by reference to the visible light passing through the sunscreening or coloring material. Its definition of net film screening also accounts for manufacturer-applied material and aftermarket film. Drivers should therefore consider the finished window rather than the film's advertised rating alone.



For example, a film labeled 35% VLT does not guarantee that a window with factory-tinted glass will measure 35% VLT after installation. The original glass and aftermarket film both affect the combined result. A tint meter can help assess the finished window's light transmission.

Washington Front Side Window Tint Requirements

Washington generally requires front side windows to allow at least 24% light transmission. This requirement applies to the driver's and front passenger's windows. The exception allowing darker rear-window film does not extend to the front side windows.

The relevant measurement is the finished window's VLT. A film labeled 24% VLT may not produce a finished window that measures exactly 24% when installed over existing tinted glass. Drivers should ask how the original glass and proposed film may affect the final reading.

The following table summarizes the general requirements under RCW 46.37.430. The rear-window exception applies only to vehicles that meet the statutory criteria.

The vehicle-category exception does not automatically apply to every SUV, truck, or van. Drivers should verify the vehicle's classification and confirm that all applicable conditions are met. The applicable reflectance limit and outside rearview mirror requirements must also be considered.

Windshield Tinting Rules in Washington

Washington permits qualifying transparent film along the windshield's top edge if it does not extend into the AS-1 portion of the windshield or more than six inches from the top. A separate provision permits clear sunscreening film that reduces or eliminates ultraviolet light to be applied to windshields.



The top-edge provision does not authorize unrestricted dark tint across the entire windshield. It has specific transparency and placement conditions, while the clear UV-film provision covers a different type of product.

Can You Apply Clear UV Film Across the Windshield?

Washington tint law permits clear film that reduces or eliminates ultraviolet light to be applied to windshields. Drivers should confirm that the proposed product is genuinely clear and suitable for windshield use rather than assuming that any film marketed as heat-rejecting qualifies.



The clear UV-film allowance is separate from the restrictions on tinted film along the windshield's top edge. Before installation, check the product specifications and intended placement against the current wording of RCW 46.37.430.

Rear Window and Back Side Window Tint Laws

Washington permits qualifying vehicles to use film with less than 24% light transmission on windows behind the driver. The statutory categories include trucks, motor homes, and multipurpose passenger vehicles, as well as other specifically identified vehicle categories subject to the conditions in RCW 46.37.430. The film must still meet the applicable reflectance limit, and the vehicle must have outside rearview mirrors on both sides where required.

The statute references the federal definition of a multipurpose passenger vehicle in 49 CFR § 571.3. A vehicle's shape or marketing description alone does not establish whether it qualifies for the exception. Drivers should check the manufacturer's vehicle classification before choosing darker rear film.

Factory Tint and Aftermarket Film Considerations

Factory privacy glass and aftermarket film both affect a window's finished light transmission. Washington's definition of net film screening accounts for manufacturer-applied material and aftermarket film installed later.

A film's standalone VLT rating does not establish the final reading when it is installed over factory-tinted glass. Measuring the existing window and assessing the proposed film can help estimate the combined result.



For vehicles that qualify for the rear-window exception, film below 24% VLT may be permitted behind the driver. Other vehicles remain subject to the general minimum. The applicable reflectance limit and mirror requirements remain important in either case.

Tint Reflectivity and Color Restrictions

Washington limits applicable sunscreening film reflectance to 35% or less on windows other than the windshield. The statute also prohibits mirror-finish products, red, gold, yellow, or black sunscreening material, and film in liquid preapplication form that is brushed or sprayed onto the glass.

Reflectance measures the proportion of light reflected outward by the material. It differs from VLT, which measures light transmission. A film must meet the applicable requirements for both properties rather than relying on its shade or appearance alone.



Drivers in Everett, Lynnwood, Bothell, and nearby communities should check a product's specifications before installation. A film that looks dark from outside is not necessarily compliant, and a film that appears relatively light is not automatically compliant either. The relevant measurements and statutory restrictions must be considered together.

Side Mirror Requirements for Tinted Vehicles

Washington requires outside rearview mirrors on both the left and right sides when the applicable tint provisions require them. Each mirror must provide the driver with a view of the roadway at least 200 feet behind the vehicle, as specified in RCW 46.37.430(5)(f).

Medical Exemptions for Window Tint in Washington

Washington permits darker window tint when the vehicle operator or a passenger has written verification from a licensed physician confirming the need for sunlight protection for physical or medical reasons. Under RCW 46.37.430(5)(d), this exception covers all windows and the top six inches of the windshield.

The law does not specify qualifying medical diagnoses, so drivers should consult a licensed physician about their individual circumstances. The written verification must be kept in the vehicle and presented to law enforcement upon request, according to the Washington State Patrol.

Certification, Stickers, and Installation Requirements

Washington regulates window film installation as well as the types of film permitted. Under RCW 46.37.430(5)(c), businesses and individuals who tint windows for profit must provide an identification sticker when tint is applied within restricted areas of the vehicle's glazing.

The sticker must be placed on the driver's door post near the manufacturer's identification tag. It must measure between ¾ × 1½ inches and 2 × 2½ inches, withstand harsh weather conditions, and clearly display the installer's business name and state tax identification number.

Washington also prohibits applying more than one sheet of aftermarket tint film to any window. Drivers should check the film's light-transmission and reflectance specifications before installation, as a product warranty does not exempt the vehicle from state tint requirements.

Practical Tips for Choosing Window Film

Choosing window film is about more than selecting a shade. Drivers should consider the finished window's VLT, the film's reflectance, and the placement restrictions that apply to their vehicle. Checking these details before installation helps customers make an informed choice and avoid selecting a film that does not meet Washington's requirements.

Penalties and Enforcement for Illegal Window Tint

Operating a vehicle on Washington public highways with film that violates RCW 46.37.430 is a traffic infraction under subsection (7). The statute establishes the violation, but the total amount payable may depend on the applicable court assessments and current fee schedule.

RCW 46.37.435 also addresses unlawful installation. Knowingly installing noncompliant safety glazing or film is a misdemeanor, while knowingly purchasing or selling installation services for unlawful installation is a gross misdemeanor.

Because ticket totals and court assessments can change, drivers should check the relevant court or official schedule for current amounts rather than rely on an unverified estimate. Drivers who suspect their film is noncompliant should review the current statute and seek qualified guidance on correcting the installation.



Checking the finished-window VLT, reflectance, and applicable placement restrictions before installation can help reduce the risk of noncompliance and the inconvenience of replacing film later.

Benefits of Legal Window Tinting

Legally compliant window film can help reduce solar heat, glare, and ultraviolet (UV) exposure while providing additional privacy. The level of protection and comfort depends on the film's construction, the vehicle's existing glass, and the product's performance specifications.



To choose the right film, drivers should compare factors such as heat rejection, UV protection, visible light transmission (VLT), and reflectance. A darker shade does not automatically provide better heat rejection or UV protection, so understanding these differences can help drivers select a film that meets their needs and Washington's legal requirements.

Ceramic Window Film and Performance

Ceramic window film is one option for drivers seeking heat rejection and UV protection without a highly reflective, mirror-like appearance. However, performance varies by product, so drivers should review manufacturer specifications rather than assume all ceramic films offer the same benefits.



When comparing ceramic films with other window tint options, drivers should evaluate heat rejection, UV performance, VLT, and reflectance alongside their comfort and privacy preferences. The selected film must also meet Washington's applicable tint restrictions, since performance benefits do not guarantee legal compliance.

Choosing a Professional Window Tint Installer in Everett & Seattle

When choosing a window tint installer in Everett or Seattle, drivers should look for clear product documentation, accurate finished-window VLT measurements, and an understanding of Washington's tint restrictions.

Before approving an installation, ask the shop to:

• Measure the existing glass when factory tint may affect the finished VLT.
• Explain how the proposed film meets applicable light-transmission and reflectance limits.
• Confirm that the film is suitable for the intended window and complies with placement restrictions.
• Explain whether the installation requires an identification sticker under window tint laws in Washington.
• Provide the product's technical specifications and written warranty terms.

A qualified installer should explain how the film's advertised VLT differs from the expected VLT of the finished window. Reviewing these details before installation helps drivers evaluate the film's performance, legal compliance, and warranty coverage.

Need Help Choosing Window Tint?

Choosing window film involves more than selecting a shade. Drivers should consider VLT, reflectance, heat rejection, and Washington's legal requirements before installation. L&M Pro Car Detailing offers STEK window films, including options designed for different performance and appearance preferences. If you're in Everett or the surrounding area, contact the team at (425) 272-5358 to find the right option for your vehicle.

Frequently Asked Questions About Washington Window Tint Laws