reprinted courtesy of ServiceMagic.com

Because custom built is often synonymous with dream home, property owners may want to make more choices about how and where their money is spent than is usually possible when working with a traditional builder. Whether they want to choose special features, hire certain subcontractors or even do some of the work themselves, owners may prefer to hire a construction manager to control final construction decisions.
Profit on a residential construction project for a new home can often range between 15-22% of the total project cost and remodeling projects can be even higher. A construction manager is paid a fee for his services (typically 10% of the total job cost) rather than the entire sum to deliver the finished house. Therefore, hiring a construction manager may save an owner money (or allow more of the building budget to go for the project and less for profit and overhead.)
A contractor manager should be a licensed general contractor with appropriate building experience hired to act as the owner's agent and perform the daily supervision of everything that goes on with the construction project. The owner and construction manager need a signed agreement/contract with the specific duties and responsibilities of both parties clearly stated, including some or all of the following:
The contract should also outline the following information:
Since licensed subcontractors are responsible for their own workmanship, all legal warranties should apply whether a general contractor or a construction manager builds the project.
-- Tips courtesy of Service Magic