1 Exterior paint averages $25-$40 a gallon, and a 3,000-square-foot home takes 15 or more gallons of paint, or $375-$600 just for the paint.ainter: Treeium. I was quoted a total price of $11,900 to paint the exterior of my home. Here's what I get: Energy efficient paint of my stucco wall and wood triming, primer,power wash, sand blast of stucco, stucco repair and replacing some of my faicia boards, and caulking.