A passerby alerted staff and customers to a fire at Subway in Grand Bend Wednesday evening.
Grand Bend firefighters responded to the Ontario Street North restaurant at around 6 p.m.
Lambton Shores Fire Chief Lawrence Swift said most of the damage was contained to the outside of the building.
A fire at the Grand Bend Subway. 19 August 2020. (Submitted photo)
"Upon arriving on scene the fire crews had a primarily exterior fire," said Swift. "It began in a small area next to the building and spread to the outside of the building and awning area. The damage is estimated at, mainly to the exterior, but most likely under $100,000."
Swift said they've been able to pinpoint the origin of the fire, but the exact cause of the blaze is still under investigation.
Everyone was able to make it out of the building safely.