Rough Custom home costs are figured on the cost of the build per square foot without the cost of the Lot. A low end cost of a custom home will start around $230 a square foot which includes the cost of the design of the home, the engineering, the build cost from the foundation to the final finishes. This cost does not include the cost of the Lot. In some cases depending on the lot, this cost would include the tap fees for the utilizes, water and sewer. These tap fees can vary greatly and in some cases will be in addition to the low end $230 a square foot build cost. Costs per square foot will vary depending on the type of design of the home, the materials and finishes selected for the home. An average time for a new home build will vary from 9 months to just over 12 months depending on the size and complexity of the design and build. These average time frames are from the time ground is broken for construction. The design process could take several months depending on the client and how much time is needed for that particular client and the approval process for the permit before construction can vary from (2) weeks to (3) months depending on the jurisdiction of where the home is being built.