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The total cost for painting an interior will run about $1.02 per square foot (about $390 for the for a 12x12 room) of wall space being painted. A professional painting contractor will be able paint an average bedroom like we listed above in only half a day.
Mural and Trompe L'oeil Costs. Specialty painting by the hour costs between $40 to $50 on average. Paint might range between $75 to $90, costing an additional $40 to $50 per hour. The painter's skill and experience are also determining factors in the cost of specialty painting. Painting a home interior: Interior walls and ceilings will top the list of projects; primer will need to be factored into the total costs. 2  See the current average cost to paint a home interior. 3  Painting a home exterior: Siding, decks and garages may be included in projects, all of which will vary in cost.