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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.
The price usually varies from $1.25 - $4.5+ sqft for a complete paint job inc â¦ luding materials. Complete meaning painting of every paintable area. The average cost per square foot for painting the interior being about $2.5 - $3 sqft.aking that into consideration, good paint costs between $15 and $30 per gallon, and very high-end paints costs about $35-$75 per gallon. So, depending on the quality of paint you choose, it can cost as little as $300 or as much as $1,500 just for the paint on this size of home.