The total cost of painting a room in Florida is not fixed because there are different interior painters with different prices. However, there is a range or average cost that homeowners should expect for their room painting. With factors like the size of the room and the requirement of other professional interior painting services in the room, homeowners could expect to pay an average of $4.30 for their room painting. Considering that the average cost of painting a room per square foot in Florida is between $2.50 and $5. Since the average room size in Florida is 250 square feet, most house painters would paint your room for an average of $625. If the interior walls of the room are tall or the painting job involves trimming and ceilings, there may be an increment in the price