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: Over 160,000 lb, over 110' long, over 16' wide, or over 16' high. A route survey is required over 110' long or over 13'6" high.
- Travel curfew: Daylight only, half-hour before sunrise to half-hour after sunset. The permit is void in slippery or inclement weather. No travel on weekends or major holidays.
- 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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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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