Obtaining a building permit prior to construction or installation. The program consists of two standard house plans ranging from 800-1,500 square feet with up to three elevations per plan.The MAG Building Codes Committee typically recommends that its members adopt the most current versions of the standard national building codes. Provides guidance for land use development, long range planning, housing, and environmental policies. Discover D.R. Horton Maricopa new construction floor plans and spec homes for sale that meet your needs.