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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.
Rating Newest Oldest. Best Answer: Normally a professional painter will charge about $1.00 to $1.50 per square foot to paint a room and that includes the ceiling. Paint cost is extra and depending on the quality. Your room area is about 600 square feet therefore at the above prices cost will range from $600 to $900.However, the cost is probably closer to $600 plus 3 times 4 liters of paint at $30 each + tax approximately will add a further $100 to increase the total cost to about $700 at the cheapest.est Answer: Normally a professional painter will charge about $1.00 to $1.50 per square foot to paint a room and that includes the ceiling. Paint cost is extra and depending on the quality.