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District of Columbia OS/OW Permit Requirements

United States · DDOT — Infrastructure Project Management Administration, OS/OW Permits

Everything heavy-haul carriers need to know before moving an oversize or overweight load through District of Columbia: survey triggers, fees, lead times and the official permit portal.

Lead time
5 business days
Base fee
$25 single-trip OS/OW permit
Permit validity
Up to 5 days

Route survey triggers

  • Height
    Height exceeds 13'6" — oversize permit required
  • Width
    Width exceeds 8'6" — oversize permit required
  • Length
    Length exceeds 55' — oversize permit required (DC limit 55')
  • Weight
    Gross weight exceeds 80,000 lbs — overweight permit required
  • Width
    Width exceeds 12' — DDOT route approval required
  • Height
    Height exceeds 14' — DDOT route survey required

Fee notes

Flat $25 per single-trip permit. DC requires MPD escort on most superloads — billed at MPD overtime rate (~$95/hr, 4-hour minimum).

Official resources

Reference information last verified May 2026. Always confirm current requirements with DDOT — Infrastructure Project Management Administration, OS/OW Permits.

Surveying a route through District of Columbia?

RoadScope generates District of Columbia-compliant survey reports automatically — the right sections, certifications and documentation for DDOT — Infrastructure Project Management Administration, OS/OW Permits.

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