The fire broke out at about 6 p.m. to G&C Marine Services at 108 Water St., The Hour said.
Smoke was coming from the roof, door and a window in the office, and the staff had gone home for the day, The Hour said.
The fire in the building was under investigation, The Hour said, and no boats were damaged.
Water, Haviland and Elizabeth streets were closed while the blaze was extinguished.
Click here for the story at The Hour.
Click here to follow Daily Voice Norwalk and receive free news updates.