There are many reasons why people choose to use a construction company rather than a personal builder. One reason is because they don't know what type of services they need and how to go about finding the right company for the job. Some people are able to take advantage of using the services of a professional contractor or company, especially if they are going to be building on multiple properties. If you're going to be building one house at a time, then you might want to consider contacting the company that has done projects similar to yours before hiring a general contractor.