Gilbert, AZ Accessory Structures: ADU Rules (2026)

3 of Gilbert's Land Development Code (revised February 23, 2023) sets the core zoning standards for accessory dwelling units. 3(2)(a)). 3(3)(a)-(c)). 3(4)(a)-(c)). ADUs may not be built over a current or planned public utility easement unless the utility company gives written consent, and full kitchens (ranges, ovens, built-in cooking facilities) are expressly permitted inside an ADU. Exterior design standards in the same section require articulated front, rear, and side elevations on two-story ADUs, architectural treatment on any elevation facing public view, prohibit roof-mounted mechanical equipment (ground-mounted equipment must be screened by a wall at least four feet high), and require the ADU to use the same refuse service as the primary dwelling, though the ADU's exterior does not have to match the primary home's design.

These are strictly zoning-standard requirements administered through Gilbert's development review process, separate from the additional Administrative Use Permit that applies once an ADU exceeds 1,000 square feet.