How do home remodeling contractors determine prices for jobs?

On the average, it will be the cost of materials times two. If you are going to have labor intensive work sone such as drywall or painting it is done by the square foot. If it is a roof, it is done by the square which is 10 feet by 10 feet, or a total of 100 square feet. Typically you are better off with a full quote than you are with an hourly one. Hopet his helps.