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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.
The average cost to paint an interior is about $0.45 per square foot per coat of paint. Factors such as high ceilings can increase the cost slightly. Another factor that can i â¦ ncrease the cost is the condition of the substrate being painted.f coarse it depends on your location. Here in North Eastern PA The average is $16-$20 per square foot, depending on the county, township, or city you are in. It costs roughly â¦ $11-$13 for the materials and contractors average about $5-$8 per square foot for labor, not including steps.