Hawaii Window Tint: 35 Per Cent Plus or Minus Six, Metered at Inspection

Hawaii writes its tint rule as a prohibition with a closed list of exceptions rather than as a permission. HRS §291-21.5(a) makes it an offense to operate, permit the operation of, cause to be operated, or even park a motor vehicle on a public highway if the glazing material fails Federal Motor Vehicle Safety Standard 205 as it stood when the glass was made, or if it is used with a sun screening device that subsection (e) does not exempt. Subsection (b) separately bars anyone from installing or using a device with "mirrored or high reflective finishes that produce a red, yellow, amber, or blue appearances as viewed from the exterior of the motor vehicle," and makes that person liable for removing the film.

The numbers live in the exemption list. Paragraph (e)(7) exempts film on front side wing vents and windows with a combined light transmittance of no less than thirty-five per cent plus or minus six per cent, and (e)(8) repeats that figure for front side windows and wing windows adjacent to the driver and necessary for driving visibility. HRS §291-21.3 defines light transmittance as the ratio of total visible light passing through the product and the glazing to the light falling on it, so the reading is always film plus factory glass, never the film alone. Paragraph (e)(9) then removes the rear windshield and the side windows to the rear of the driver on sedans, vans, minivans, trucks and buses from the rule altogether, conditioned on the vehicle carrying rearview mirrors on both sides. The windshield gets its own allowances: a strip of transparent film along the top edge that does not encroach on the AS-1 portion, or no lower than four inches below the top of the windshield measured from the middle of the bottom edge of the top moulding where no AS-1 marking can be found, plus a seven-inch square in the lower corner farthest from the driver and a five-inch square in the corner nearest the driver for signs and stickers. Motor homes may use interior privacy drapes, curtains or blinds under (e)(10).

Enforcement is what distinguishes Hawaii. The tint check is not tucked away in an inspection regulation; the tint statute itself imposes it. Subsection (c) says a safety inspection required under HRS §286-26 "shall include a test to ensure that the glazing material and any sun screening devices meet the requirements specified in this section." Under §286-26(b) most vehicles are certified every twelve months, and a new vehicle is not due for its first inspection until two years after it was first sold, so a Hawaii car meets a light meter roughly once a year for its whole life after year two. Section 286-26(g) obliges the director of transportation only to write rules covering mufflers and headlamps as a minimum, which means the tint test at the lane comes from §291-21.5(c) rather than from the inspection statute.

Act 129, Session Laws of Hawaii 2025, signed on 29 May 2025 and effective on approval, rewrote the section. It added subsection (d), the roll-down rule; it lifted the owner fine from the previous band to $300 to $550 and the installer fine to $700 to $1,200; it added the mirrored and high-reflective color prohibition in (b); and it made an installer's failure to issue the compliance certificate a violation in its own right. Section 3 of the Act required the Department of Transportation to notify every licensed motor vehicle inspection station of the changes within ninety days of the effective date. Subsection (g) also lets the department adopt chapter 91 rules setting standard criteria or visual references for enforcing the color and reflectivity prohibitions.

Two paper trails decide most Hawaii tint cases. The installer must issue the vehicle owner a certificate at the time of installation certifying that the device complies with the law, the certificate "shall be stored in the motor vehicle at all times," and its absence at the moment of citation is prima facie evidence that the installer was not compliant. The receipt from the installer, if it is in the possession of the person in the vehicle when the citation issues, is prima facie evidence of who the installer was, which is how the $700 to $1,200 installer penalty gets attached to a named business.

An installer who is fined must also reinstall compliant film free of charge or reimburse the owner for having another installer do it. 5(c) glazing test will not receive a certificate of inspection under §286-26, which in practice blocks the annual sticker until the film comes off. Subsection (d) carries a lighter consequence than the tint offense itself: a driver's or passenger's failure to fully roll the windows down at a traffic stop "may be cited as a noncriminal traffic infraction," and the subsection does not apply to someone who cannot comply because of physical disability or mechanical failure so long as the driver communicates or cooperates through other means reasonably available.