The average cost to paint a 12-foot by 12-foot room is approximately $110. However, many variables go into computing the cost of painting a room, including the size of the room, the paint selected, and whether the homeowner plans to paint the room himself or hire a contractor.
The least expensive option to paint a room is for the homeowner to do so himself, eliminating labor costs. Supplies needed to paint a room include paint, paintbrushes and rollers, a roller tray, painter's tape and a drop cloth. The average cost to contract a painter to paint the same size room is between $350 and $800 in the United States.