Washington window tinting laws allow side and rear windows as dark as 24 percent light transmission. Reflectivity, colors, and the windshield carry firm rules. Thrive Integrated Northwest Tint installs film for Tacoma and Puget Sound drivers. Heat and glare relief should never cost a ticket. Drivers comparing shades can start with automotive window tinting in Tacoma and then check each shade against the limits below.
What Are Washington’s Window Tint Laws at a Glance?
Washington sets its tint rules in RCW 46.37.430, the state’s safety glazing and sunscreening statute. It requires 24 percent or more light transmission and 35 percent or less reflectance on any window except the windshield. The rules assume the vehicle has left and right outside mirrors.
Trucks, motor homes and multipurpose passenger vehicles get one exception. Their windows behind the driver may go darker, while front side windows stay at 24 percent.
The table reflects the statute text and Washington State Patrol guidance as checked on October 7, 2026. Older summaries still circulate online, including a 2011 State Patrol handout that says windshields allow no tint at all. The current statute adds the six-inch strip and the UV film allowance.
What Does VLT Mean, and How Dark Is 24 Percent Tint?
VLT stands for visible light transmission. It is the share of visible light that passes through a window, so a lower number means a darker window. A 24 percent reading lets 24 percent of visible light through.
Washington’s statute uses the phrase “net film sunscreening,” which means the total sunscreening or coloring material applied to a window. It does not describe a measuring method or name a tint meter. Thrive Integrated Northwest Tint offers Union Window Films in 5, 15, 20, 35, and 50 percent shades. Matching each shade to its window matters before installation.
Industry note, not Washington law: film over factory glass usually reads darker on a meter than the box number. A 35 percent film can land near the 24 percent line once glass is counted. Asking an installer for a meter reading of the finished window removes the guesswork.
Can a Windshield Be Tinted in Washington?
A Washington windshield cannot carry general tint. The statute allows clear film that reduces or blocks ultraviolet light, and nothing else across the glass. The only dark strip allowed is a transparent band along the top.
That band cannot extend into the AS-1 portion of the windshield or more than 6 inches down from the top. AS-1 is the federal safety glazing marking on the glass, usually printed near an upper corner.
Clear ceramic or UV film marketed for windshields should be confirmed with the installer before purchase. The statute speaks to clear film that reduces ultraviolet light. A film that visibly darkens the glass falls outside that wording.
What Are the Rules for Front, Rear Side and Rear Windows?
Washington treats each window position differently only when a vehicle class changes the answer. For ordinary passenger cars, one number covers every window except the windshield.
Thrive Integrated Northwest Tint works from a Tacoma shop on S Steele Street. Mobile installs reach Pierce County and more than 30 Washington communities. These statewide limits apply at every address, from Tacoma and Puyallup to Seattle and Olympia.
Front Side Windows
Front side windows must allow 24 percent or more light transmission on every vehicle class. The truck and multipurpose exception covers only windows to the rear of the driver. A 20 percent or 5 percent film on a front door is not legal without a medical exemption.
Rear Side Windows
Passenger cars need 24 percent or more on rear side windows. A truck, motor home or multipurpose passenger vehicle, as identified by its manufacturer, may use darker film behind the driver. Reflectance must stay at 35 percent or less, and dual outside mirrors are required.
Rear Window
The rear window follows the same split. Passenger cars stay at 24 percent or more, while qualifying trucks, motor homes, and multipurpose vehicles may go darker. Whether a specific SUV or van qualifies depends on its manufacturer’s classification. Ask the installer to confirm before choosing a shade.
Is 70%, 50%, 35%, 20% or 5% Tint Legal in Washington?
Shades of 70, 50 and 35 percent sit above the 24 percent minimum. They fit the statute on side and rear windows. Shades of 20 and 5 percent fall below it. Those darker films are legal only behind the driver of a qualifying truck, motor home or multipurpose vehicle. A medical exemption is the other path.
Every shade in this table still has to meet the reflectance, color and mirror rules. None of them is legal on the windshield outside the top 6-inch strip. A 5 percent film, often called limo tint, is the most common cause of tint tickets on sedans.
For a written tint price matched to your vehicle, film, and coverage, call Thrive Integrated Northwest Tint at 253-345-0929. Share your vehicle year, make, and model to receive a clear carbon or ceramic tint quote. Appointments are available across Tacoma.
How Do Reflectivity, Banned Colors and Mirror Rules Work?
Reflectance measures how much light bounces off a window toward the outside. Washington caps it at 35 percent on every tinted window except the windshield. Films with a metallic or mirror look are the usual source of problems.
The statute bans mirror finish products and red, gold, yellow or black material. It also bans liquid film that is brushed or sprayed on. More than a single sheet of film on any window is prohibited. Film color therefore matters as much as film darkness.
Mirror rules follow the tint. Vehicles need left and right outside mirrors that reflect a view of at least 200 feet to the rear. That requirement matters most for trucks and SUVs with dark rear glass.
How Do Rules Differ for SUVs, Trucks, Vans and Special Vehicles?
Washington does not write separate rules for sedans, coupes or crossovers by body style. It writes them by how the manufacturer identifies the vehicle. A truck, motor home or multipurpose passenger vehicle may carry darker film on windows to the rear of the driver.
Many SUVs and vans are sold as multipurpose passenger vehicles, but body style alone does not decide it. The classification comes from the manufacturer. A Tacoma driver with a crossover should confirm it before buying 20 or 5 percent film for the back glass.
The statute also lists separate provisions for hearses, limousines, passenger buses, ambulances, emergency medical vehicles and collector vehicles. Commercial vehicles face a federal rule, 49 CFR 393.60, which Washington State Patrol guidance points to.
Is Factory Privacy Glass the Same as Aftermarket Window Tint?
Factory privacy glass is dyed into the glass during manufacturing. RCW 46.37.430 permits shaded or heat-absorbing safety glazing applied at the factory, provided it meets federal standards. That glass is not film, so it does not count as net film sunscreening.
Aftermarket tint is a film applied after the vehicle is built, and every film rule above applies to it. A vehicle with dark factory glass in the back can therefore be legal as delivered. Adding film on top can push the combined reading below the limit.
This is why a shop should ask whether the glass is already tinted. A meter reading before and after installation shows how much light the glass and film let through together.
How Does a Medical Tint Exemption Work in Washington?
Washington allows greater light reduction when a driver or passenger must be shielded from sunlight for physical or medical reasons. The statute requires written verification from a licensed physician. It extends the exemption to all windows and to the top 6 inches of the windshield.
The statute does not create a state permit or a specific form. A letter from the physician is the document. Washington State Patrol guidance tells drivers to carry that verification in the vehicle. The statute text does not spell out a carrying rule.
The exemption does not make the full windshield tintable. It speaks to light reduction only. Drivers should confirm color and reflectance questions with the installer before film goes on.
What Are the Penalties and Installer Sticker Rules?
Operating a vehicle with illegal tint is a traffic infraction under RCW 46.37.430. Washington law caps a base infraction penalty at $250 unless another law authorizes more. Courts set actual amounts through a penalty schedule. The full statute appears as RCW 46.37.430 on the Washington State Legislature site.
Installers face stricter rules. RCW 46.37.435 makes knowingly installing illegal tint a misdemeanor, and knowingly buying or selling an illegal installation a gross misdemeanor. Anyone tinting windows for profit must apply a sticker showing the installer’s business name and state tax identification number. The sticker certifies that the film meets the statute’s standards for light transmission, reflectance, and placement.
Drivers should keep the installation receipt, the film shade, and the sticker details together. The statute describes no tint inspection program and names no measuring tool. Those details are not covered here.
What Should Washington Drivers Remember Before Choosing a Tint Shade?
Washington window tinting laws come down to a few numbers. Passenger car side and rear windows need 24 percent or more light transmission. Reflectance stays at 35 percent or less, and the windshield allows only clear UV film plus a top strip. Qualifying trucks, motor homes and multipurpose vehicles may go darker behind the driver, and physician-verified need allows more.
Thrive Integrated Northwest Tint can match film shades to these limits for Tacoma and Puget Sound vehicles. Drivers planning a budget can also read the guide to Tacoma window tint pricing in 2026 before requesting a quote.
Thrive Integrated Northwest Tint can recommend a legal shade for each window on a car, truck or SUV. Call 253-345-0929 to book a Tacoma shop visit or mobile install in Pierce County. Get a tint plan that fits Washington’s limits before any film goes on.
Frequently Asked Questions
Is 20% tint legal on front windows in Washington?
No. Washington requires 24 percent or more light transmission on front side windows for every vehicle class, so 20 percent film is darker than the statute allows. Only a physician-verified medical exemption permits darker front film, so most drivers choose 35 or 50 percent film instead.
Is 5% limo tint legal anywhere on a Washington vehicle?
Only in limited cases. A qualifying truck, motor home or multipurpose passenger vehicle may use 5 percent film behind the driver if reflectance stays at 35 percent or less and dual outside mirrors are present. It is not legal on sedan windows or on any front side window in Washington.
How far down can a windshield tint strip go in Washington?
A transparent strip may reach 6 inches down from the top of the windshield but cannot extend into the AS-1 portion of the glass. Below that, only clear film that reduces ultraviolet light is allowed. A physician-verified medical exemption also covers only the top 6 inches of the windshield.
Does a doctor’s note let a driver go darker than 24 percent in Washington?
Yes. Written verification from a licensed physician, stating a physical or medical need for sun protection, allows greater light reduction on all windows and the top 6 inches of the windshield. Washington State Patrol guidance advises carrying that letter in the vehicle while driving.
Does Washington require a sticker on tinted windows?
Yes, for professional installs. Anyone tinting windows for profit must apply a sticker showing the installer’s business name and state tax identification number. It certifies that the film meets the statute’s light transmission, reflectance, and placement standards. Keep the installation receipt too.
What happens if a Tacoma driver is cited for illegal window tint?
Illegal tint is a traffic infraction in Washington. The base penalty is capped at $250 unless another law authorizes more, and courts set actual amounts by schedule. A cited driver should compare the invoice shade and installer sticker details with RCW 46.37.430 before responding.
