Window Tint Guide: Get Tinted
How a Legal Tint Check Works Before Installation
Ask for "35% tint" at two different cars and you can get two different results: one legal, one not. South Carolina does not regulate the film number on the box. It regulates how much light gets through the film and the glass together, and it treats an SUV's rear windows differently from a pickup's.
That is why The Auto Show checks the legal shade for your vehicle before installing. This guide explains what a legal tint check involves, step by step, so you understand the shade we recommend and why.
The short answer
A legal tint check starts with the vehicle type, because South Carolina exempts windows behind the driver on multipurpose passenger vehicles but not on pickups. Then each regulated window is considered on its own: the factory glass already blocks some light, and the film plus glass must still pass at least 27% of visible light. The film must be nonreflective and not red, yellow or amber, and windshield film must stay above the AS-1 line.
Key points
- South Carolina regulates combined light transmission, film plus glass, not the number printed on the film.
- Front side windows must stay at 27% or more combined on every vehicle.
- Windows behind the driver are exempt on multipurpose passenger vehicles such as most SUVs and minivans, but not on pickups.
- Combined light is found by multiplying: 75% glass with 35% film gives about 26%, which is under the limit.
- Windshield film may only run along the top, above the AS-1 line, and none is allowed if the line is not visible.
Step 1
Identify the vehicle type
The first question is not the shade. It is what kind of vehicle you drive. South Carolina's light transmission rule applies to windows behind the driver on pickup trucks, but not on other trucks, buses, trailers, mobile homes, recreational vehicles or multipurpose passenger vehicles.
The state defines a multipurpose passenger vehicle as one designed to carry ten people or fewer that is built on a truck chassis or with special features for occasional off-road use, which closely tracks the federal definition. Most SUVs and many minivans are classified this way. Federal rules require the manufacturer's certification label, on the driver's door edge, door-latch post or hinge pillar, to state the vehicle's type classification, such as MPV or truck.
So the check starts at the door jamb. An SUV labeled MPV has more freedom behind the driver; a crew-cab pickup labeled truck does not, even though both have back seats.
If the label is missing or unclear, ask us or check with SCDPS before relying on the exemption.
Step 2
Map which windows are regulated
- WindshieldAll vehicles
- Film only along the top, not below the AS-1 line. If the AS-1 line is not visible, no film is allowed on the windshield.
- Front side windowsAll vehicles
- Combined light transmission of film and factory glass at least 27%. Film must be nonreflective.
- Rear side windowsCars and pickups
- Combined at least 27% and nonreflective. Exempt from the light rule on multipurpose passenger vehicles.
- Rear-most windowCars and pickups
- Combined at least 27% and nonreflective, and a tinted rear window requires both outside mirrors. Exempt from the light rule on multipurpose passenger vehicles.
- Every window with filmAll vehicles
- No red, yellow or amber film; nonreflective only; a certificate of compliance on the inside lower right corner. Full SC tint law guide
Step 3
Account for the factory glass
Car glass is not perfectly clear. Many front side windows carry a light tint from the factory, and the rear windows of many SUVs and vans use dark privacy glass. Every bit of light the glass already blocks counts against the 27% limit once film is added.
In practice, installers commonly measure the glass with a handheld light transmission meter and work from that reading. We confirm how we check your specific vehicle when you book. The point is the same either way: the shade is chosen for your glass, not picked from a sample book.
South Carolina's statute adds one useful detail. If no after-factory film has been added to a window, the light transmission limits do not apply to it. Factory privacy glass on its own is not a violation. The question only arises when film goes over it.
Step 4
Do the combined math
Combined light transmission is found by multiplying the glass and film percentages as decimals. Glass that passes 80% of light with a 35% film gives 0.80 x 0.35 = 0.28, or 28%, just above the limit. The same 35% film on glass that passes 75% gives about 26%, which is under it.
This is why two cars can end up with different film numbers and the same legal result, and why a film that was legal on your last car might not be on this one. Manufacturers also note that actual performance varies with glass type, and films are made to tolerances, so landing exactly on 27% leaves no margin.
Step 5
Check reflectivity and color
The law requires film to be nonreflective, defined as a product primarily designed to absorb light rather than reflect it, and bans red, yellow and amber. Mirror-finish and colored films are out regardless of how much light they pass.
The films we install are LLumar Carbon, with its charcoal color built into the film rather than dyed on the surface, and LLumar Ceramic, which uses nano-ceramic particles to reject infrared heat. Ask us how either one looks on your car.
Step 6
Recommend a shade and record it
With the vehicle type, window map and glass known, the result is a shade recommendation for each window. On a sedan or pickup, that means front and rear windows stay at or above 27% combined. On an SUV or minivan, it often means the front doors are tinted to blend as closely as the law allows with darker rear privacy glass, while the exempt rear windows can go darker if you want.
After installation, each tinted window gets South Carolina's certificate of compliance, showing the light transmission allowed by the film, our name, address and phone number, and the installation date.
If the shade you hoped for is darker than the check allows, we tell you before installing, not after. The usual options are a lighter shade of ceramic film, which keeps more heat out without relying on darkness, or, if you have a qualifying medical condition, South Carolina's physician or optometrist affidavit. Bring that paperwork and ask before you book.
| Factory glass passes | Film | Combined | On a regulated window |
|---|---|---|---|
| 85% | 35% | About 30% | At or above 27% |
| 80% | 35% | 28% | At or above 27%, little margin |
| 75% | 35% | About 26% | Below 27% |
| 75% | 50% | About 38% | At or above 27% |
| 25% (privacy glass) | Any film | Below 25% | Below 27%; allowed only where the window is exempt |
Illustrative arithmetic only. Real glass varies by vehicle, so the shade for your car is confirmed before installation. Not legal advice.
Find out what is legal on your vehicle
Send us your year, make and model and the windows you want tinted. We check the legal shade before any film goes on.
Common questions
Why can't I just get the same tint as my friend's car?
Because the legal limit is on film and glass combined. If your friend's factory glass passes more light than yours, the same film can be legal on their car and too dark on yours. Vehicle type matters too: an SUV's rear windows are exempt, a pickup's are not. The shade has to be chosen for your glass.
Can I tint over factory privacy glass on my pickup?
South Carolina applies the 27% combined rule to windows behind the driver on pickups. Factory privacy glass alone is not a violation, but once film is added, the combined result must be at least 27%. If the privacy glass already passes less than that, adding film there would not meet the rule. Ask us to look at your truck.
Is my minivan a multipurpose passenger vehicle?
Many are, but check the certification label on the driver's door edge or pillar, which federal rules require to state the vehicle type. If it says MPV, the light transmission rule does not apply to windows behind the driver under South Carolina law. Front side windows still must stay at 27% combined or more.
Does the rear window need two side mirrors if it's tinted?
Yes. South Carolina requires one right and one left outside rearview mirror on a vehicle whose rear-most window has film. Nearly every modern car has both, but it matters on some older or specialty vehicles. The statute does not list mirrors as a condition for side windows.
Sources
- S.C. Code Ann. § 56-5-5015, South Carolina Legislature (https://www.scstatehouse.gov/code/t56c005.php), accessed October 2026
- 49 CFR 571.3 Definitions (multipurpose passenger vehicle), Legal Information Institute, Cornell Law School (https://www.law.cornell.edu/cfr/text/49/571.3), accessed October 2026
- 49 CFR 567.4 Requirements for manufacturers of motor vehicles (certification label), Legal Information Institute, Cornell Law School (https://www.law.cornell.edu/cfr/text/49/567.4), accessed October 2026
- 49 CFR 571.205 Glazing materials, Legal Information Institute, Cornell Law School (https://www.law.cornell.edu/cfr/text/49/571.205), accessed October 2026
- LLumar Window Film Performance Data (LL0116NAEN, 03/26), Eastman Performance Films (https://llumar.com/content/dam/eastman/performance-films/llumar/documents/LL0116NAEN_AutoSpecs_screen.pdf), accessed October 2026
Prices on this page are The Auto Show’s published starting prices. Film ratings and warranty terms come from the manufacturer. This guide explains South Carolina law in plain words; it is not legal advice.