Average Cost Estimates: Interior Painting: Expect a range of $2.75 – $7 per square foot, with most homeowners in Minnesota paying around $3.50 per square foot on average. This includes paint and labor. Exterior Painting: Exterior projects typically range from $60 to $160 per 100 square feet, with an average cost of around $80-$100 per 100 square feet in Minnesota. This includes paint, labor, and power washing (if recommended).