Kent Fire and Rescue were called to the fire in Rosewood yesterday at 8.49pm (April 13).
Three fire engines and their crews were used to bring the blaze under control by 10.55pm.
One person was treated by paramedics for precautionary checks.
The cause of the fire is not known at this stage.
A spokesperson for Kent Fire and Rescue said: “Kent Fire and Rescue Service was called to reports of a garage alight in Rosewood, Dartford.
“Three fire engines were sent to the property, where firefighters wearing breathing apparatus used hose reel jets to extinguish the flames.
“One person was passed into the of care of SECAmb paramedics for precautionary checks. The cause is not yet known.”