The length of time that the construction of the project takes depends upon several variables. Some of these include the size and detail of the project, the length of time to obtain the proper permits, the weather and the ability of the homeowner and designer to make timely decisions in the selection process. Typically in a new custom home, the construction process can take anywhere from 9 months to 12 months. However, a larger more detailed home could take up to 18 months.