How much does interior wall painting cost per square foot with putty and primer?

Interior wall painting costs per square foot depend on the surface condition, preparatory steps, and the chosen paint formulation. A complete application typically involves: 1. Scraping and surface cleaning of the plaster. 2. Applying a primer coat to seal the substrate. 3. Applying coats of wall putty with intermediate sanding to create an even, level base. 4. Applying finishing coats of interior emulsion. Costs vary primarily by the finish selected—ranging from economical acrylic emulsions to washable premium or luxury sheens—and the labor required for smooth sanding. High ceilings, intricate moldings, dark accent colors requiring additional coats, and extensive plaster repairs will increase overall labor and material consumption.