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The total cost for painting an interior will run about $1.02 per square foot (about $390 for the for a 12x12 room) of wall space being painted. A professional painting contractor will be able paint an average bedroom like we listed above in only half a day.
If you decide to paint your home yourself, you can calculate thecost of paint and utilize the result to figure out your painting cost per square foot. Depending on the type of paint you choose, paint and primer will cost anywhere from $15 to $60 per gallon.Designer and low-VOC paints often cost more. One gallon of paint will cover an average of 350 square feet. To calculate the number of gallons you will need, measure all surfaces to be painted.aint. If you decide to paint your home yourself, you can calculate thecost of paint and utilize the result to figure out your painting cost per square foot. Depending on the type of paint you choose, paint and primer will cost anywhere from $15 to $60 per gallon. Designer and low-VOC paints often cost more.