Window tint laws
Window tint laws. Window tint laws are state-by-state regulations that set the minimum legal VLT (darkness) for each window position on a vehicle, and often limit reflectivity and tint color. Limits differ for windshield, front sides, rear sides, and rear window, and many states measure the combined film-plus-glass value.
Definition
There is no national U.S. tint law — every state sets its own, and they vary widely. A film that is legal on front sides in one state is illegal across the border. Reputable shops confirm the customer's state limits before quoting, because the shop, not just the driver, can be liable for an illegal install. Tint laws typically also restrict mirrored/metallic reflectivity and certain colors (red, amber, blue are commonly banned).
Limits are per window position
Windshield: usually only a non-reflective strip down to the AS-1 line. Front sides: the most regulated, commonly 35–70% VLT minimum. Rear sides and rear: often much darker or unrestricted. The "legal percent" only means something paired with a window position.
Film-plus-glass measurement
Many states measure VLT on the combined glass and film, not the film alone. Factory glass already cuts some light, so a 35% film can read below 35% installed. Quoting on film-only numbers risks an illegal result.
Medical exemptions + enforcement
Some states allow darker tint with a medical exemption. Enforcement and fines vary. Software that stores VLT and the customer's state can flag an illegal combination before you quote it.
See also
- VLT (Visible Light Transmittance) — VLT
- Window tint shop software — Window tint shop software
- Ceramic window tint — Ceramic window tint
Roffik's take
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