Washington Window Tint Laws (2026): Legal VLT Limits
Washington Window Tint Laws (2026): Legal VLT Limits
Washington requires all windows except the windshield to allow at least 24% visible light transmission (VLT). That single 24% minimum applies to front side windows, back side windows, and the rear window alike, making Washington one of the more permissive tint states in the country. Certain special vehicles may go darker behind the driver.
What is the legal tint limit in Washington?
Washington State sets a single VLT floor for almost every window on the vehicle: 24%. That means the tint film, combined with the factory glass, must allow at least 24 out of every 100 units of visible light to pass through. Because a higher VLT percentage means lighter tint and a lower percentage means darker tint, 24% is noticeably dark to the eye but still legal.
The 24% minimum covers the front side windows, the back side windows, and the rear window. There is no sedan-versus-SUV split for the front windows. The distinction arises only behind the driver's seat: hearses, limousines, ambulances, collector vehicles, and multipurpose vehicles (SUVs, vans, and trucks) may legally run any darkness on their back side and rear windows, provided dual outside mirrors give an unobstructed rearward view.
| Window | Sedans | Special/Multipurpose Vehicles |
|---|---|---|
| Front side | 24% VLT minimum | 24% VLT minimum |
| Back side | 24% VLT minimum | Any darkness (dual mirrors required) |
| Rear window | 24% VLT minimum | Any darkness (dual mirrors required) |
If you are shopping for tint and trying to figure out how dark 24% looks, think of a medium charcoal shade. Films sold as "25% tint" will meet the standard; anything marketed as "20%" or darker on the front or back side windows of a standard sedan would be illegal.
Washington's 24% limit has been in place for several years with no recent legislative changes. The law covers all passenger vehicles registered and driven in Washington, regardless of where the vehicle was originally purchased or where the tint was installed.
Windshield tint rules in Washington
Washington does not allow tint film on the windshield below the AS-1 line. The only exception for the general public is a completely transparent UV-blocking film applied across the entire windshield; as long as the film adds no visible color or significant reflectivity it does not count as a "tinting device" under RCW 46.37.430.
Medical exemptions create a narrow additional path: a person with a qualifying photosensitivity condition may receive written physician verification that allows a non-reflective strip at the top 6 inches of the windshield for sun protection. Outside of that medical carve-out, no colored or darkening film is permitted on the windshield.
Reflectivity across all windows is capped at 35%. Mirror-finish films that reflect more than 35% of light are prohibited regardless of which window they are applied to. Films in red, gold, yellow, or black are also banned outright; these colors either reduce visibility for other drivers or distort the perceived color of traffic signals.
Medical exemptions
Washington allows a medical exemption from the standard 24% VLT minimum. A person with a qualifying medical condition (typically involving sensitivity to sunlight or UV radiation) may obtain written verification from a licensed physician. That documentation permits darker tint on any window, including the front side windows and, under certain circumstances, the windshield.
The documentation must be carried in the vehicle at all times. If you are pulled over, you will need to produce the physician's written verification to avoid an infraction. The exemption does not override the color bans; even under a medical exemption, red, gold, yellow, and black films remain prohibited.
There is no state-issued permit or registration number to obtain. The process is between you and your physician. A letter on the physician's letterhead describing the condition and the specific windows covered is the standard form of documentation.
How tint is measured and certified
Washington State Patrol and local law enforcement use calibrated VLT meters (photometers) to measure the combined light transmission of the glass and any film applied to it. The meter reads the actual light passing through the installed tint; the film's label specification is not the deciding measurement.
Washington requires installers to affix a sticker to each tinted window. The sticker must list the business name and tax ID of the installer and confirm the tint complies with RCW 46.37.430. This label serves as the first evidence that a professionally installed film is legal; it also protects you if the tint was done by a licensed shop and you were not aware of any compliance issue.
No official measurement tolerance is specified in the statute. Because meters can vary slightly between devices, choosing a VLT that sits comfortably above 24% (for example, a 28% film) gives a useful margin of safety against borderline readings. Installers who work frequently with law enforcement understand this margin and will typically recommend it.
Penalties for illegal tint in Washington
Operating a vehicle with window tint that does not meet the 24% VLT minimum is a traffic infraction in Washington. The fine amount is set under Washington's standard infraction schedule and is not a criminal charge. You will typically receive a notice requiring correction of the equipment violation, and you may face a fine.
Installing non-compliant tint is treated more seriously. Under RCW 46.37.430, a person who installs illegal window tint on another's vehicle commits a misdemeanor. This distinction matters if you had work done by a shop: the installer bears the heavier legal burden, while the driver faces the infraction-level ticket.
Law enforcement may stop a vehicle when the tint appears visually darker than 24%. The stop is not classified as a pretextual stop under Washington law when the officer has a genuine belief the tint is non-compliant. Getting a citation corrected generally requires a reinspection showing the film was removed or replaced with a legal alternative.
If you want to tint your windows in Washington
Start by choosing a film that is rated at 24% VLT or higher on the specification sheet. Because meters measure the combined glass-and-film system, and factory glass already absorbs a small amount of light, many installers recommend selecting a film rated at 28% to 30% to be sure the final reading stays above 24%.
Choose an installer familiar with Washington's rules. A reputable shop will confirm the specific VLT, install the required compliance sticker on each window, and issue a receipt showing the product used. Keep that paperwork in your vehicle along with the sticker in place, since those two items are your first line of defense at a traffic stop.
Do not choose films in red, gold, yellow, or black regardless of VLT rating; those colors are banned. Mirror-finish or highly reflective films are also off the table. If you have a qualifying medical condition, get the physician's written verification before the tint is installed so the installer knows which windows the exemption covers.
If you are buying a vehicle with existing tint, verify the VLT with a meter before purchase or get a written warranty from the seller. Tint installed in another state may not meet Washington's 24% standard, and you become responsible for compliance once you register the vehicle in Washington.
This article is general legal information, not legal advice. Window tint limits vary by state and change, and enforcement depends on local practice and your specific vehicle. For a definitive answer, check your state DMV or consult a local attorney.
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Sources
- RCW 46.37.430 - Window tinting devices, Washington State Legislature
Related pages
For an overview of window tint rules across all 50 states, see the Window Tint Laws by State hub.
Washington drivers may also want to review Washington Windshield Mounting Restrictions, which covers rules on objects placed on or near the windshield.