price is what you pay. value is what you get.

If you are looking to refresh EITHER walls, trim OR ceilings in your home with the same or very similar colors, you can anticipate a cost closer to $2/sqft AND if you'd rather CHANGE either the walls, trim OR ceilings to a different color that may be darker OR lighter, that will be closer to $4/sqft. Other factors such as extensive prep, drywall repairs, furniture, closets, or vaulted spaces will also be taken into consideration.

In a similar fashion, if you need to have several surfaces painted, such as the walls & trim, without a significant change of color, your general pricing will be closer to the $3/sqft range. If it's time to customize the space with a significant color change, you'd consider a price closer to $5/sqft which accounts for the extra time needed for the extra coats.

For a Standard Whole House repaint, not making a significant change of color (from light to dark OR dark to light) your ballpark amount will be closer to $4/sqft and with any Custom Painting or big change in color to be closer to $6/sqft. Apply these amounts to the square footage of the floor space for your project to get an idea of basic costs, and take into account that high ceilings or extensive prep/repair will be additional. 

For standard painting of an Interior and even Exterior Door of your home, you can anticipate a cost of $40-70/per door, per side. If you don't want to paint the closets in your home, for example, it would be best to paint only 1 side of the door, the one facing the outside of the closet.