If you are paying for your painting project per square foot, the costs vary between interior and exterior projects. The average painting cost per square foot for exterior painting projects ranges from $1.50 to $4. For interior painting, you can expect to pay between $2 and $6. Generally speaking, interior projects will be more expensive due to the complexity of the project. Even though exterior paint costs more than interior paint, it is more difficult to prep, paint, and clean rooms of various shapes and sizes versus the entire outside of a house. That’s why the overall cost is more per square foot.
Sanding siding and trim. If you need to remove large areas of loose paint from wood siding or trim, use a power sander.

Plan your painting project when the weather is warm and dry. If it’s too cold outside, work goes slowly and paint won’t dry. If it’s too hot outside, the paint may dry too quickly, which leaves marks. Also, rain, humidity, and the wind delay drying time, and harm the end result.
Closets, pantries, and nooks are relatively easy to paint and do not add a ton of additional costs to a job. Don’t forget, larger walk-in closets can cost more to paint based on their size and amount of wall space not covered by shelving. Painting closets can cost as little as $60 – $280 for smaller or medium-sized spaces. The pricing for walk-in closets can be compared to bathrooms with similar sq ft dimensions Costs can also vary if you add trim, ceilings, or additional preparation or repairs