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. https://www.youtube.com/watch?feature=youtube.be&v=b6_WEt9k_Hw
To paint a large section without leaving lap marks, roll the nearly dry roller in different directions along the dry edge, feathering out the paint as you go. After completing the entire length of the wall or ceiling, move to the next section and paint over the feathered edges. For the second coat, apply the paint in the opposite direction. This crisscrossing paint application sharply reduces (if not eliminates) lap marks.
