Most New Hampshire drivers can legally use window tint that lets in at least 35 percent of visible light on the front side windows, while the rear side and back windows may be tinted down to 70 percent light transmission. The windshield must remain essentially clear, allowing virtually 100 percent light. These limits are set by RSA 267:1‑17 and enforced by the State Police and local law‑enforcement agencies.
Legal Tint Limits by Window
- Front side windows – Minimum of 35 percent light transmission (i.e., no darker than 35 percent). This is the strictest requirement because the driver must maintain clear visibility of surrounding traffic and pedestrians.
- Rear side windows – Minimum of 70 percent light transmission is allowed, meaning the glass can be considerably darker than the front windows.
- Rear window – Also must meet the 70 percent rule, unless a vehicle is equipped with side mirrors that meet the state’s mirror‑visibility standards.
- Windshield – Must be essentially clear; any tint that reduces light transmission below 70 percent is prohibited, except for a narrow strip at the top (no more than 4 inches) that may contain a non‑reflective sunshade.
These percentages are measured with a calibrated tint meter and refer to visible light transmission (VLT). Violations are typically identified during routine traffic stops or vehicle inspections.
Penalties for Non‑Compliant Tint
Driving with illegal tint can result in a civil citation, a fine of up to $250, and a requirement to remove or replace the tint within a specified period. Repeat offenders may face higher fines and possible suspension of vehicle registration until compliance is demonstrated. Law‑enforcement officers may also seize the vehicle’s registration stickers until the tint is corrected.
Verifying Compliance
The simplest way to confirm legal tint is to use a handheld VLT meter, which provides an immediate reading. Many auto‑glass shops offer free testing. If you receive a citation, you can request a copy of the officer’s measurement; contesting the citation may involve having an independent technician re‑measure the tint.
Medical Exemptions
New Hampshire allows medical exemptions for drivers whose conditions (e.g., photosensitivity, skin cancer) require additional protection. The exemption must be documented on a physician’s letter and filed with the Division of Motor Vehicles. Even with an exemption, the windshield must remain clear enough for safe operation, and the driver must carry the exemption documentation while operating the vehicle.
Frequently Asked Questions
What happens if my vehicle’s rear window tint is darker than 70 percent?
The vehicle will fail a safety inspection and you will be issued a citation. You must have the tint removed or replaced to meet the 70 percent standard before the registration can be renewed.
Can I apply a UV‑blocking film to my windshield?
Yes, a non‑reflective UV‑blocking film that does not reduce visible light transmission below 70 percent is permissible, provided it does not create glare for the driver.
Do imported cars have different tint rules?
No. All passenger vehicles, regardless of origin, must comply with the same New Hampshire VLT limits outlined above.
How often are tint meters calibrated?
Professional tint meters should be calibrated annually according to the manufacturer’s guidelines and state inspection standards to ensure accurate readings.
Is there a difference between “factory‑installed” tint and aftermarket tint?
Factory‑installed tint is considered part of the vehicle’s original equipment and must still meet the 35‑percent front side and 70‑percent rear limits. Aftermarket tint is subject to the same regulations and must be tested after installation