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Modular Homes

Modular Homes, Casitas & Container Homes in Arizona

Permit-ready accessory dwelling units, guest houses, studio sheds, and workforce housing — engineered, inspected, and built to stay put.

HB 2720ADUs legal statewide
Shop-builtWeather-independent schedule
Permit-readyStamped plan sets

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The law changed

Arizona legalized backyard casitas

If you looked into a casita before 2024 and were told no, that answer is probably out of date.

HB 2720 (signed May 2024) requires every Arizona municipality with 75,000+ residents to permit ADUs on single-family residential lots, effective January 1, 2025. It caps the setback a city can require at five feet, allows casitas up to 1,000 sq ft, and prohibits cities from making your casita match your house. HB 2928 (signed May 2025) extended comparable requirements to counties from January 1, 2026.

We wrote the full plain-English breakdown — every provision, the short-term-rental rule, and the HOA catch that surprises people — all cited to the bill text.

Read the Arizona ADU law guide →

Answers

Modular home questions

Yes, subject to the same permitting and code compliance as any other dwelling. What matters to your jurisdiction is that the structure is engineered, permitted, and inspected — not what the walls used to be. Arizona also legalized ADUs statewide via HB 2720 (cities 75,000+, effective January 2025) and HB 2928 (counties, January 2026), which is why backyard casitas got dramatically more feasible. Some jurisdictions apply added scrutiny to container construction specifically, so confirm early.

In Arizona practice these terms overlap heavily. "ADU" (accessory dwelling unit) is the statutory term used in HB 2720 and is what your planning department will say. "Casita" is the common regional word for the same thing. "Guest house" sometimes implies no kitchen, which in some jurisdictions is the line between a guest house and a full dwelling unit — and that distinction can change what you are allowed to build and rent.

The shop build is measured in weeks and runs on a predictable, weather-independent schedule. The variable is plan review and permitting at your jurisdiction, which differs widely by city and current backlog. Once plans are submitted, we can give you a realistic timeline for the part we control.

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