Washington’s window tint laws trip up more drivers than you’d expect. Whether you just bought a car with aftermarket tint, you’re shopping for a new install, or you got pulled over and aren’t sure why the rules come down to one statute and a handful of numbers. This guide breaks down exactly what RCW 46.37.430 says in plain language, so you know what’s legal before you spend a dollar or risk a ticket.
If you’re ready to get a compliant install done right, request a free quote from MC Tint we’re XPEL-certified, and every job includes the state-required compliance sticker.
How Washington Measures Window Tint Darkness
The law uses a measurement called Visible Light Transmission (VLT). VLT is the percentage of visible light that passes through your window glass and tint film combined. A higher VLT means more light gets through, resulting in a lighter-looking tint. A lower VLT means a darker window.
Washington’s baseline rule is straightforward: most windows need a net VLT of at least 24%. But the specifics vary by vehicle type and the window you’re referring to.
Legal Tint Limits by Vehicle Type and Window Position
This is where most of the confusion lives. Washington law draws a clear line between sedans (cars and coupes) and multipurpose vehicles (SUVs, trucks, and vans). Here’s what the statute allows:
Sedans (Cars and Coupes)
| Window Position | Minimum VLT | Notes |
| Windshield | No tint on the main area | Non-reflective strip on top 6 inches only; clear UV film allowed on full windshield |
| Front side windows | 24% VLT | Driver and passenger windows |
| Rear side windows | 24% VLT | Same limit as fronts on sedans |
| Rear window | 24% VLT | Dual side mirrors are required if tint is applied |
SUVs, Trucks, and Vans
| Window Position | Minimum VLT | Notes |
| Windshield | No tint on the main area | Same as sedans, top 6 inches only |
| Front side windows | 24% VLT | Same as sedans, no exception |
| Rear side windows | No minimum VLT | Can be as dark as you want (including limo tint) |
| Rear window | No minimum VLT | Dual side mirrors required; ≤35% reflectivity |
This distinction is a major advantage for truck and SUV owners. You can legally run 5% limo tint on every window behind the driver, as long as the front side windows stay at 24% or lighter and the vehicle is equipped with side mirrors on both sides. Sedan owners don’t get that flexibility 24% VLT applies to every window except the windshield.
One detail that catches people off guard: the 24% VLT measurement accounts for both the film and the factory glass combined. Most factory glass already has a VLT of around 70–75%, so when you add a 35% VLT film to stock glass, the net result is roughly 24–26% right at the legal limit. A 20% film on stock glass drops you below the line. That math matters more than most installers bother to explain.
Reflectivity, Color Restrictions, and Film Rules
Washington doesn’t just regulate darkness. RCW 46.37.430 also sets rules on how reflective your tint can be and what type of materials are allowed:
- Reflectivity: No window can exceed 35% total reflectance. That rules out mirror-finish or heavily metallic films. If your tint reflects strongly when viewed from outside, it likely exceeds this limit.
- Prohibited colors and materials: Red, gold, yellow, and black-colored films are not permitted. Neither are mirror-finish products nor any liquid tint that’s brushed or sprayed on. Standard automotive tint in charcoal, gray, or neutral tones, which is what quality ceramic and carbon films come in, is fine.
- No stacking: You’re only allowed one layer of film per window. If a previous install is already on the glass, it must be removed before a new film is applied. Layering two films will almost certainly drop the VLT below legal limits and is a separate violation.
- Clear UV film exception: The law explicitly permits clear, transparent film that filters UV light on the full windshield. This is a strong option for drivers who want UV protection without any visible darkening, and it’s an area where XPEL’s PRIME XR Plus excels. The Skin Cancer Foundation has awarded its Seal of Recommendation to multiple XPEL PRIME window film lines for blocking over 99% of UVA and UVB rays.
The Required Installer Sticker
Here’s one that surprises many people: Washington law requires any person or business that tints windows for profit to provide a certification sticker. That sticker gets placed on the driver’s side door post, near the manufacturer’s identification tag, between the film and glass.
The sticker verifies that the installed tint complies with state law. If your vehicle has aftermarket tint but no sticker, that’s a red flag during a traffic stop and could indicate the film wasn’t installed by a professional or doesn’t meet state requirements. Every installation MC Tint performs includes this compliance sticker as standard procedure.
What Happens If Your Tint Is Illegal
Driving with non-compliant window tint is a traffic infraction under Washington law. Officers can and do use portable tint meters to measure VLT during a traffic stop if your windows appear too dark. There’s no tolerance buffer built into the statute; if your front side windows measure below 24% VLT, you can be cited.
The typical fine ranges from $124 to $136 per offense, though the exact amount varies by jurisdiction. Beyond the ticket, you may receive a fix-it notice requiring you to remove or replace the illegal film before driving the vehicle again. When you factor in the cost of stripping the old tint, purchasing new film, and paying for a second installation, the total expense of an illegal tint job usually ends up well over double what a compliant install would have cost from the start.
It’s also worth knowing that under RCW 46.37.435, providing or receiving payment for installing non-compliant tint is classified as a gross misdemeanor, not just a traffic infraction. That’s a more serious charge, and it’s one of the reasons reputable shops won’t install film that violates the statute.
Washington’s Medical Exemption for Darker Tint
If you have a medical condition that requires greater protection from sunlight, such as lupus, melanoma, photosensitivity disorders, or severe migraines with photophobia, Washington law allows a darker tint than the standard limits.
The key requirement: you must have written verification from a licensed physician stating that you or a regular passenger needs protection from sunlight for physical or medical reasons. That letter must be kept in the vehicle at all times and presented to law enforcement if requested.
There are a few things to understand about this process. MC Tint does not issue medical exemptions; only a licensed physician can provide that documentation. What we do is handle the compliant installation once you have your physician’s letter in hand. We’ve worked with exempt vehicles before and can help ensure the film meets your medical needs while staying within the exemption.
For a full walkthrough of qualifying conditions, the physician letter requirements, and how to carry your documentation, read our guide to Washington’s window tint medical exemption process.
How Washington’s Tint Laws Compare to Neighboring States
If you drive across state lines or you bought a vehicle in Oregon or Idaho, it helps to know where Washington stands relative to its neighbors:
| State | Front Side Min VLT | Rear (SUV/Truck) | Medical Exemption? |
| Washington | 24% | No minimum | Yes physician letter |
| Oregon | 35% | 35% | Yes physician letter |
| Idaho | 35% (driver) / 20% (pass.) | 20% | Yes physician certificate |
| California | 70% | Any darkness | Yes, varies by county |
Washington is notably more permissive than Oregon regarding front-side windows and rear windows for SUVs and trucks. A vehicle that’s legal in Washington may not be legal in Oregon, and vice versa. If you’re regularly crossing I-90 from Ellensburg toward Idaho or heading west over the Cascades, this is worth keeping in mind.
Central Washington Enforcement: What to Expect Locally
Enforcement intensity varies across the state. In urban areas like Seattle and Tacoma, officers tend to focus on significantly illegal tint rather than marginal cases. But here in Central Washington across Kittitas County, Yakima, and the I-90 corridor, window tint can attract attention, especially during routine traffic stops.
The Yakima Police Department has publicly posted the state’s tint requirements as a community reminder, which tells you it’s on their radar. If you’re driving through Ellensburg, Cle Elum, or out toward Wenatchee and Issaquah, you’re better off being at or above the 24% VLT line than trying to push it.
Central Washington’s driving conditions also make a strong case for quality tint that stays within legal limits. The high-desert sun in Kittitas Valley is intense in summer, and the low-angle winter sun crossing the valley or through the Cascade passes creates significant glare. A well-installed ceramic film at 25–30% VLT gives you meaningful heat rejection and UV protection without putting you on the wrong side of the law.
Choosing the Right Tint to Stay Legal and Get Real Performance
Not all window films deliver the same performance at the same VLT level. This is where film type matters far more than darkness:
- Ceramic film (like XPEL PRIME XR Plus) uses nano-ceramic particle technology to block up to 98% of infrared heat while maintaining higher VLT. That means you can run a lighter, legal tint and still get better heat rejection than a cheap, darker dyed film that’s actually illegal. Ceramic film also won’t interfere with radio, cellular, GPS, or Bluetooth signals, unlike metallic films.
- Carbon film offers solid heat rejection and color stability at a mid-range price point, without the signal interference issues of metallic options.
- Dyed film is the least expensive option and can look good initially, but it fades faster, rejects less heat, and provides minimal IR blocking. It’s a case where saving money up front usually costs more in the long run.
- As an XPEL-authorized installer, MC Tint uses films engineered to deliver maximum performance within legal VLT limits. That’s not a compromise, it’s what premium ceramic technology was designed for.
Frequently Asked Questions About Washington Tint Laws
Is 20% tint legal in Washington?
Not on front-side windows; 20% VLT is darker than the 24% minimum required by law for all vehicles. However, 20% tint is legal on rear side windows and the rear window of SUVs, trucks, and vans, since those windows have no minimum VLT requirement on multipurpose vehicles.
What’s the darkest legal tint in Washington state?
For sedans, the darkest legal tint is 24% VLT on all sides and rear windows. For SUVs, trucks, and vans, the darkest legal tint on front side windows is 24% VLT, but rear side and rear windows can be any darkness, including 5% limo tint, as long as the vehicle has dual side mirrors and the film doesn’t exceed 35% reflectivity.
Can I tint my entire windshield in Washington?
No. Aftermarket tint is only allowed on the top 6 inches of the windshield (or above the AS-1 line), and it must be non-reflective. The one exception is clear, transparent UV-filtering film, which can be applied to the full windshield because it doesn’t reduce visible light transmission.
Does ceramic tint count differently under the law?
No, the law regulates VLT percentage and reflectivity, not the type of film. Ceramic, carbon, and dyed films are all legal as long as they meet the VLT and reflectivity requirements. Ceramic is generally the best choice because it blocks more heat at a given VLT level, so you get superior performance without needing to go darker.
What if I bought a car with illegal tint already on it?
You’re still responsible. Washington law applies to the vehicle’s current condition, not when the tint was installed. If you buy a car from out of state or from a private seller and the tint doesn’t meet WA standards, you’ll need to have the film removed or replaced to avoid a citation.
Get Legal, High-Performance Tint Installed Right
Knowing Washington’s tint laws is the first step. The second is choosing a shop that installs compliant film, includes the required certification sticker, and uses products that actually perform within legal limits.
MC Tint is an XPEL-authorized installer based in Ellensburg, serving drivers across Central Washington, including window tinting in Ellensburg, window tinting near Cle Elum, and window tinting in Issaquah, as well as the greater Kittitas County and Yakima Valley areas. Whether you drive a sedan, a Tesla, a work truck, or an SUV, every install comes with our 100% money-back guarantee and the state-required compliance sticker.
Get a free quote and let’s make sure your tint is legal, looks great, and does what it’s supposed to do.
