Casita vs. ADU: What's the Difference?
If you've been researching backyard living spaces, you've probably seen a lot of terms thrown around: casita, ADU, guesthouse, in-law suite, granny flat. Are these all the same thing?
The Short Answer
In Arizona, "casita" and "ADU" (Accessory Dwelling Unit) refer to the same thing — a fully permitted, self-contained living unit built on the same lot as your primary home. The other terms (guesthouse, in-law suite, granny flat) are informal names for the same concept.
What Makes It an ADU
An ADU is defined by having:
- ✓Its own entrance
- ✓A kitchen or kitchenette
- ✓A bathroom
- ✓Living/sleeping space
- ✓Full utilities (electrical, plumbing, HVAC)
This is different from a "bonus room" or converted garage, which typically doesn't have a separate entrance or full kitchen facilities.
Why We Call Them Casitas
"Casita" means "little house" in Spanish, and it perfectly describes what we build — a small, standalone home in your backyard. In Arizona, "casita" is the more common term, and it carries a warmth that "accessory dwelling unit" doesn't.
The Legal Term Matters
When it comes to permits, zoning, and regulations, the city uses "ADU" or "accessory dwelling unit." That's the term you'll see on permit applications and city ordinances. But whether you call it a casita, an ADU, or a guesthouse, the permitting process is the same.
What Space Break Builds
We build fully permitted ADUs — casitas — in four models ranging from 250sf to 1,000sf. Every unit includes its own entrance, kitchen or kitchenette, bathroom, and full utilities. Starting at $95,000, permits included.