The national average cost for an interior painter ranges between $450 and $900. Interior painters can tackle everything from complete color makeovers in each of your rooms to touching up an accent wall to painting pieces of furniture. The square footage and complexity of the project, along with the materials needed, are the main factors that will affect cost. Other factors include whether you supply the paint yourself or want the painter to do so, whether you move the furniture and do the prep work or ask them to do it, and whether any repair work is needed on the walls. Painting the ceiling and the trim will also have an effect on cost. The type of paint you choose can also raise or lower your house painting cost. A gallon of paint may range from $20 to over $100, depending on quality and brand. Ask your painter if they charge per hour or per square foot, and how much you can save by doing prep work (moving furniture, etc.) yourself.
As a former professional painter, something that drives me crazy is when I see painters cut in around wall plates. First of all, the amount of time that it takes to cut in is usually much longer than the amount of time that it takes to simply remove the wall plate. Secondly it does not look nearly as clean as it does when the wall plate is removed and thirdly it can invariably leave paint on the wall plate itself which also looks sloppy. Make sure the painter takes them off and then reinstalls them. It's less time.