Va. Code § 46.2-1128
The owner of any motor vehicle may obtain an extension of single axle, tandem axle, and gross weight set forth in this article by purchasing an overload permit for such vehicle. The permit shall extend the single axle weight limit of 20,000 pounds, tandem axle weight limit of 34,000 pounds, and gross weight limit based on axle spacing and number of axles on such vehicle by a maximum of five percent. However, no such permit shall authorize the operation of a motor vehicle whose gross weight exceeds 84,000 pounds, nor shall any such permit authorize any extension of the limitations provided in § 46.2-1127 for interstate highways.
Permits under this section shall be valid for one year and the fee shall be $250.
Such fee shall be allocated as follows:
The Commissioner shall make the permit available to vehicles registered outside the Commonwealth under the same conditions and restrictions which are applicable to vehicles registered within the Commonwealth. The Commissioner may promulgate regulations governing such permits. Except as provided in this section and § 46.2-1129, no weights in excess of those authorized by law shall be tolerated.
Vehicles that are registered as farm use vehicles as provided in § 46.2-698 may operate as authorized under this section without a permit or the payment of any fee; provided, however, that should such vehicle violate the weight limits permitted by this section and § 46.2-1129, such vehicle shall be required to apply for and receive a permit and pay the permit fee to operate as authorized in this section.
Va. Code § 46.2-1128