New Hampshire Oversize & Overweight Permits
Over 8'6" wide, 13'6" high, or 80,000 lb, NHDOT permits under Tra 304. An annual runs $115 statewide, $60 inside 100 miles if you're NH-based; single trips are roughly $6 to $10. Daylight only, half-hour either side of the sun, and dead on weekends, holidays, or slick roads. One escort at 12' wide or 90' long; over 100' long or over 14' wide pulls State Police. Superload starts at 160,000 lb, 110' long, or 16' wide or high.
A detail here is flagged medium confidence — confirm with the state permit office before you rely on it.
When New Hampshire needs a permit
Over 8'6" wide, 13'6" high, or 80,000 lb, NHDOT permits under Tra 304. An annual runs $115 statewide, $60 inside 100 miles if you're NH-based; single trips are roughly $6 to $10. Daylight only, half-hour either side of the sun, and dead on weekends, holidays, or slick roads. One escort at 12' wide or 90' long; over 100' long or over 14' wide pulls State Police. Superload starts at 160,000 lb, 110' long, or 16' wide or high.
Thresholds, escorts, and curfews
- Legal max before a permit: No permit up to 8'6" wide, 13'6" high, 80,000 lb, and within legal length. Over any one of those and NHDOT issues an OS/OW permit before you roll.
- Escort / pilot car: One escort when 12' wide up to 14', 90' long or more, over 14' high, or with a 15'+ overhang. Two escorts when both 12' wide and carrying a 15' rear overhang. Over 100' long adds a State Police escort; over 14' wide needs two State Police escorts. Route survey over 110' long or over 13'6" high.
- Superload: Supermove starts over 15' wide, over 110' long, over 13'6" high, or over 149,999 lb (Tra 304.12(c)). Below that line the permit office cannot issue an ordinary single trip permit past 15' wide, 110' long, or 13'6" high at all (Tra 304.12(b)). A supermove may be scheduled at any time of day on a weekday or a weekend day. A route survey is required over 110' long or over 13'6" high.
- Travel curfew: Daylight only, half an hour before sunrise to half an hour after sunset, and the permit dies in slippery or inclement weather. Ten holidays are closed, not six: New Year's, Martin Luther King Jr. Civil Rights Day, Washington's Birthday, Memorial Day, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving and the day after, and Christmas (Tra 304.14(g)). Weekends are closed under Tra 304.14(h), but NHDOT runs a seasonal Saturday program: from April 18 to November 21, 2026 you may move from 30 minutes before sunrise until 12 p.m., and only until 9 a.m. on I-95 between May 30 and August 29. Supermoves can be scheduled any day and any hour.
- Permit fee: Annual permit: $115 statewide, or $60 within a 100-mile radius if the carrier is NH-based and registered. Single-trip permits run roughly $6 to $10, plus about $2 per additional 10,000 lb on overweight moves.
New Hampshire Oversize Permit FAQ
When do I need an oversize permit in New Hampshire?
Does New Hampshire require a pilot car or escort?
Can I move an oversize load at night or on weekends in New Hampshire?
What does an oversize permit cost in New Hampshire?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.nhdotpermits.org/. See our Terms & Disclaimer.
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