Got a weekend and want to transform your home's look without breaking the bank? Interior door painting is a perfect starter project with major visual payoff for the cost of a quart of paint, typically around $30 (Apartment Therapy). It takes basic tools, not a workshop full of gear, and it instantly freshens scuffed or dated doors (Caitlin Marie Design). Prep well, use the right technique, and a few hours later the door looks like it got the deluxe treatment.