As an owner-builder, a homeowner acts as its own contractor. However, all electrical and plumbing work must be performed by contractors licensed to perform that work. The structure cannot be sold or leased or offered for sale or lease within one (1) year after completion of the construction.s an owner-builder, you are acting as your own general contractor oversseing that the work complies with all applicable laws, building codes and zoning regulations. It is your responsbility to insure that all subcontractors hired by you have the appropriate licenses required by state laws and county ordinances.