A firefighter was hospitalized with heat exhaustion, the Hackensack Fire Department said.
Firefighters responding to the two-alarm blaze sparked by downed wires at Rocky Auto Repair at Daniel and Kenneth streets just before 1:30 p.m. had it doused in well under an hour.
The building sustained some exterior damage, but firefighters kept interior damage to a minimum.
Englewood, Teaneck and Ridgefield Park, NJ, firefighters were among the responders who assisted their city colleagues. An EMS unit from Hackensack University Medical Center also responded.