Officials from Delmarva Power said it happened around 9:40 a.m. when a contractor working in the 400 block of Garasches Lane struck a gas line.
Occupants of the fieldhouse were evacuated.
Route 13 was closed northbound as crews worked to make repairs. The road has since reopened.
Crews are investigating the cause of the leak, as representatives said no Delmarva Power crews were scheduled for work today.
Delmarva power said no customers were impacted by the incident.