NH
New Hampshire oversize permit rules
What New Hampshire charges for a single-trip OS/OW permit, the limits that trigger one, and the escort thresholds — read from the state’s own publication. This rule has been in effect since 2023-07-01.
Oversize permit
$6
One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Overweight permit
From $5.50
Scales with weight — there is no single figure.
+ $20 Permigo service fee per permit, state fees at cost.
Legal limits
Exceed any one of these in New Hampshire and you need a permit for this state.
| Limit | Interstate | Off-interstate |
|---|---|---|
| Width | 8'6" | 8'6" |
| Height | 13'6" | 13'6" |
| Length | 65'0" | 65'0" |
| Gross weight | 80,000 lbs | 80,000 lbs |
| Single axle | 20,000 lbs | |
| Tandem axle | 34,000 lbs | |
| Trailer length | 53'0" |
What the permit costs
New Hampshire prices a single-trip permit as flat rate. One price for a single-trip permit, whatever the dimensions. A 9-foot-wide load and a 16-foot-wide load pay the same.
Escort requirements
Thresholds by road class. Where two classes differ, the road you are actually on governs.
Divided highway
| Width | Requirement |
|---|---|
| 12'0" and over | 1 rear escortWidth 12'0" or more and LESS than 14'0" (Tra 304.17(c)(1) verbatim window): ONE non-police escort — 'precede a load on undivided highways and follow the load on divided highways' (304.17(k)(3)). Escort floor: no escort below 12'W / 90'L / 15' rear overhang with marking flags displayed (304.17(b)).SOURCE STATUS: N.H. Admin Code Tra 304 — the escort/supermove rulebook — formally EXPIRED 4-23-2025 (RSA 541-A:17 ten-year sunset) with no readoption, extension, or rulemaking found through 7/12/2026; NHDOT and NHSP continue operating under its text (permits issue under RSA 266:24 statutory authority). Thresholds here reflect operative practice; a future readoption filing could change them. |
| Over 14'0" | 2 police escortsWidth EXCEEDS 14'0": a total of 2 State Police escorts (Tra 304.17(f)) — 'in addition to any required non-police escort(s)' (304.17(g), NHSP ADDS, never replaces), but the 12'–14' width-civilian window has ENDED, so width alone above 14' carries the 2 NHSP only. OPERATOR GAP: at EXACTLY 14'0" neither rule applies — zero width escorts (the (c)(1) '<14 feet' / (f) 'exceeds 14 feet' seam,) |
| Over 15'0" | superload permitWidth exceeds 15'0" = Supermove (Tra 304.12(c)(1); routine permits cap at 15' — 304.12(b)(1)). Supermove permits 'may be at any time of day on either a weekday or a weekend day' as the permit specifies (304.12(f)); fee = the standard RSA 266:22 schedule plus applicant-borne engineering-review costs; no annual supplemental. |
| Height | Requirement |
|---|---|
| Over 13'6" | route survey · superloadHeight exceeds 13'6" = Supermove (Tra 304.12(c)(2)) + a carrier-completed ROUTE SURVEY ('greater than 13 feet 6 inches' — 304.07(g)(1); the portal's system-generated form, reusable up to 30 days). No routine height tier exists above 13'6". |
| Over 14'0" | 1 rear escortHeight greater than 14'0": ONE non-police escort (Tra 304.17(c)(3)) — the word 'pole' appears NOWHERE in Tra 300; New Hampshire codifies no height-pole vehicle |
| Length | Requirement |
|---|---|
| 90'0" and over | 1 rear escortOverall length 90'0" or more: ONE non-police escort (Tra 304.17(c)(2)); precede on undivided / follow on divided (304.17(k)(3)). |
| 100'0" and over | 1 police escortLength 100'0" or more: ONE State Police escort IN ADDITION to the civilian (Tra 304.17(e)) — waivable: 'unless the state police determine that weather conditions, visibility, traffic flow, or other conditions do not compromise safe movement.' NHSP $113/hr, 4-hr minimum. |
| Over 110'0" | route survey · superloadLength exceeds 110'0" = Supermove (Tra 304.12(c)(1); routine cap 110' — 304.12(b)(2)) + carrier route survey ('greater than 110 feet' — 304.07(g)(2)). |
| Rear overhang | Requirement |
|---|---|
| 4'0" and over | Marking requiredRear overhang 4' or more: red light/lantern visible 500 ft (night) + red flag/cloth ≥12" square (RSA 266:46). Permitted loads with front or rear overhang carry ≥4 corner flags (Tra 304.15(c)). |
| 15'0" and over | 1 rear escortRear overhang 15'0" or more: ONE non-police escort (Tra 304.17(c)(4)); position per the 304.17(k)(3) flip. COMBO: rear overhang ≥15' AND width ≥12' = a SECOND non-police escort (304.17(d) — REAR-overhang only for general loads; the front-or-rear version exists only in the manufactured-housing grid 304.13(g)(2)) — not auto-billed, surfaced here. |
| Front overhang | Requirement |
|---|---|
| 15'0" and over | 1 rear escortFront overhang 15'0" or more: ONE non-police escort (Tra 304.17(c)(4)). No general front-overhang legal exists in NH statute (auto-transporter 3' allowance aside, RSA 266:11-a); the ≥15' escort is the only numeric front-overhang rule |
| Weight | Requirement |
|---|---|
| 150,000 lbs and over | superload permitWeight 'exceeds 149,999 pounds' = Supermove (Tra 304.12(c)(3)). |
Undivided
| Width | Requirement |
|---|---|
| 12'0" and over | 1 front escortWidth 12'0" or more and LESS than 14'0" (Tra 304.17(c)(1) verbatim window): ONE non-police escort — 'precede a load on undivided highways and follow the load on divided highways' (304.17(k)(3)). Escort floor: no escort below 12'W / 90'L / 15' rear overhang with marking flags displayed (304.17(b)).SOURCE STATUS: N.H. Admin Code Tra 304 — the escort/supermove rulebook — formally EXPIRED 4-23-2025 (RSA 541-A:17 ten-year sunset) with no readoption, extension, or rulemaking found through 7/12/2026; NHDOT and NHSP continue operating under its text (permits issue under RSA 266:24 statutory authority). Thresholds here reflect operative practice; a future readoption filing could change them. |
| Over 14'0" | 2 police escortsWidth EXCEEDS 14'0": a total of 2 State Police escorts (Tra 304.17(f)) — 'in addition to any required non-police escort(s)' (304.17(g), NHSP ADDS, never replaces), but the 12'–14' width-civilian window has ENDED, so width alone above 14' carries the 2 NHSP only. OPERATOR GAP: at EXACTLY 14'0" neither rule applies — zero width escorts (the (c)(1) '<14 feet' / (f) 'exceeds 14 feet' seam,) |
| Over 15'0" | superload permitWidth exceeds 15'0" = Supermove (Tra 304.12(c)(1); routine permits cap at 15' — 304.12(b)(1)). Supermove permits 'may be at any time of day on either a weekday or a weekend day' as the permit specifies (304.12(f)); fee = the standard RSA 266:22 schedule plus applicant-borne engineering-review costs; no annual supplemental. |
| Height | Requirement |
|---|---|
| Over 13'6" | route survey · superloadHeight exceeds 13'6" = Supermove (Tra 304.12(c)(2)) + a carrier-completed ROUTE SURVEY ('greater than 13 feet 6 inches' — 304.07(g)(1); the portal's system-generated form, reusable up to 30 days). No routine height tier exists above 13'6". |
| Over 14'0" | 1 front escortHeight greater than 14'0": ONE non-police escort (Tra 304.17(c)(3)) — the word 'pole' appears NOWHERE in Tra 300; New Hampshire codifies no height-pole vehicle |
| Length | Requirement |
|---|---|
| 90'0" and over | 1 front escortOverall length 90'0" or more: ONE non-police escort (Tra 304.17(c)(2)); precede on undivided / follow on divided (304.17(k)(3)). |
| 100'0" and over | 1 police escortLength 100'0" or more: ONE State Police escort IN ADDITION to the civilian (Tra 304.17(e)) — waivable: 'unless the state police determine that weather conditions, visibility, traffic flow, or other conditions do not compromise safe movement.' NHSP $113/hr, 4-hr minimum. |
| Over 110'0" | route survey · superloadLength exceeds 110'0" = Supermove (Tra 304.12(c)(1); routine cap 110' — 304.12(b)(2)) + carrier route survey ('greater than 110 feet' — 304.07(g)(2)). |
| Rear overhang | Requirement |
|---|---|
| 4'0" and over | Marking requiredRear overhang 4' or more: red light/lantern visible 500 ft (night) + red flag/cloth ≥12" square (RSA 266:46). Permitted loads with front or rear overhang carry ≥4 corner flags (Tra 304.15(c)). |
| 15'0" and over | 1 front escortRear overhang 15'0" or more: ONE non-police escort (Tra 304.17(c)(4)); position per the 304.17(k)(3) flip. COMBO: rear overhang ≥15' AND width ≥12' = a SECOND non-police escort (304.17(d) — REAR-overhang only for general loads; the front-or-rear version exists only in the manufactured-housing grid 304.13(g)(2)) — not auto-billed, surfaced here. |
| Front overhang | Requirement |
|---|---|
| 15'0" and over | 1 front escortFront overhang 15'0" or more: ONE non-police escort (Tra 304.17(c)(4)). No general front-overhang legal exists in NH statute (auto-transporter 3' allowance aside, RSA 266:11-a); the ≥15' escort is the only numeric front-overhang rule |
| Weight | Requirement |
|---|---|
| 150,000 lbs and over | superload permitWeight 'exceeds 149,999 pounds' = Supermove (Tra 304.12(c)(3)). |
Movement restrictions
| Restriction | In New Hampshire |
|---|---|
| Night travel | Daylight hours only |
| Weekends | Restricted |
| Holidays | Restricted |
Movement hours
| Situation | Window |
|---|---|
| Oversize (incl. OS+OW) | ½ hr before sunrise → ½ hr after sunset, weekdays only (Tra 304.14(h),(i)) |
| Overweight-only (normal speeds) | UNRESTRICTED — no daylight, weekend, or holiday limits (304.14(j)) |
| Weekends (OS) | invalid BOTH days — except supermoves + >12′-wide building moves (304.14(h)) |
| Saturday seasonal 2026 | designated routes: sunrise−30 min → 12:00 PM, Apr 18–Nov 21; I-95 only to 9:00 AM May 30–Aug 29; never on holiday weekends |
| Night moves | NHSP escort required, 48-hour notice (portal notice) |
| Supermoves | any time of day, weekday or weekend, as the permit specifies (304.12(f)) |
| Holidays 2026 (OS) | Jan 1 · Jan 19 · Feb 16 · May 25 · Jul 3 · Sep 7 · Oct 12 · Nov 11 · Nov 26–27 · Dec 25 (Sun holiday→Mon, Sat→Fri; Juneteenth unrestricted) |
| Weather | no movement in inclement weather — exit at the first available location (304.14(k)) |
| Spring thaw | posted sections: 30,000 lb gross or tire-inches ×300, whichever less (RSA 236:3-a) |
| Validity | 5 business days; 10 for round-trip reverse route (304.12(i)) |
Where these permits come from
If you file yourself, this is the office you are dealing with. Check the linked page — some states issue OS/OW permits through their highway patrol or revenue department rather than the DOT.
| New Hampshire permit office | |
|---|---|
| Permit office | 603-271-2691 |
| Filing notes | [email protected] · portal nhdotpermits.org (login via 'New Hampshire Access' since 6/24/2026) |
RSA 266:10/:11/:11-a/:12/:18/:18-a/:18-d/:22/:24/:46 (gc.nh.gov official, 266:22 eff. 7/1/2023, no amendments through… · nhdotpermits.org · in effect since 2023-07-01. Fees and rules change; the linked document is always the authority.