I use Lynn White in Salinas, very honest To paint interior trim & doors, it isn't very expensive if you do it yourself. Depending on how much paint you buy & what kind, it should cost around $50 if you get a medium quality, large can. Next, you will need to buy brushes, masking tape, & other painting necessities. If you hire someone, it may be more but painting the interior trim & doors of a house should cost less than $100. I would estimate it would cost $85 depending on the type of paint, the amount of paint, the type of brushes, the size of the areas which need to be painted, etc.