Compare offers. The painter offering the lowest rate may not always be the best painter for the job. Indeed, the total cost isn't the only factor to consider when choosing between multiple bids. You'll want to look at contracts side by side to ensure you're making an apples-to-apples comparison. Are the same materials being used? Are the same services included? Does the painter provide a warranty?
Most of a projects price is the cost of labor at $25 to $75 per hour. However, most contractors bid out based on the entire project which includes all work hours. Hourly rates are only useful if your pro asks to do the job as “time and materials.” However, be wary of this pricing structure, it usually shows the contractor is uncertain how long the project will take.