Peoria, AZ Accessory Structures: Tiny Homes (2026)

5 specifically names 'APPENDIX Q - TINY HOUSES' among the appendices the city enforces, alongside Appendix J for existing buildings and Appendix H for patio covers. Rather than leave Appendix Q's model definition untouched, the same ordinance amends Appendix Q Section AQ102, 'Definitions,' to read: 'TINY HOUSE. ' That local rewrite does two things the base appendix does not: it sets a 200-square-foot floor on top of the 400-square-foot ceiling, and it confirms loft square footage is excluded from both counts. A structure under 200 square feet or over 400 square feet cannot be permitted as a Peoria 'tiny house' under Appendix Q; it is reviewed under the full 2018 International Residential Code, or for larger accessory living space the International Building Code, like any other dwelling or accessory structure.

The Appendix Q pathway matters for anyone adding a detached tiny house as an accessory structure on a residential lot, because Appendix Q's construction requirements are less extensive than the full Residential Code chapters governing egress, ceiling height, and stairs for standard homes. Plan review and permitting for a tiny house built to Appendix Q proceeds through the same Building Official process as any other Section 18-25 permit, since Appendix Q is adopted as part of, not separate from, the city's Residential Code.