Category Arizona ADU Guide

Under Arizona’s casita laws, most single-family lots in Maricopa County can have an ADU. But “most” isn’t “all.” Before you spend money on plans, check these four things. (New to the laws? Start with our breakdown of HB 2720 and…

As of January 1, 2026, the Arizona casita law is fully in effect — not just in big cities, but across unincorporated Maricopa County too. If you’ve been holding off on building a backyard ADU because you weren’t sure what…