Casita and Guest House Builder in Arizona

In Arizona, an ADU is the legal term for a self-contained second home you can rent. A casita is the everyday Southwest word for that same small building. A guest house is a separate, stricter category in cities like Scottsdale: it cannot be rented and is capped smaller, often with no full kitchen.

Yes. You can build a guest house without a full kitchen in Arizona, and many people do on purpose. Leaving out the kitchen is what keeps it a guest house, not a rentable ADU, in cities like Scottsdale. That means a smaller size cap, lower cost, and shared utilities, but you cannot rent it.

Yes, in most cases. To convert a guest house into a rentable ADU in Arizona, you add a full kitchen, give it separately metered utilities, and pull a permit. State law A.R.S. 9-461.18 then protects your right to rent it long-term in cities over 75,000 people, like Scottsdale and Phoenix.

Yes. You can rent out a casita or ADU in Scottsdale. State law A.R.S. 9-461.18 protects your right to use an ADU as a long-term rental, and Scottsdale must allow it. Short-term rentals under 30 days are also legal but need a city license. Your HOA's CC&Rs can still add restrictions.

Yes, in Arizona an HOA can still block an ADU even when the city must allow it. The state ADU law, A.R.S. 9-461.18, applies to cities, not HOAs. It expressly does not prohibit private restrictive covenants on ADUs, so recorded CC&Rs can ban or limit them.

In most of Arizona you can have at least two ADUs on a single-family lot, one attached and one detached. On a lot of one acre or more, you can add a third detached ADU if at least one unit is deed-restricted affordable housing. State law A.R.S. 9-461.18 sets this floor.

Place a casita where it gives guests privacy without cutting them off: near the entry courtyard with its own separate entrance, or attached to the main home through a shared courtyard or breezeway. Keep it away from the primary suite for quiet, give it private outdoor space, and decide early whether it shares or has a separate entrance.

The two ways to cool a casita separately are a dedicated mini-split system or a separate zone added to the main HVAC. A ductless mini-split is usually the best fit for a detached casita: it gives the guest suite its own thermostat, runs only when occupied, and avoids long duct runs through a hot Arizona attic.

Almost always because a casita bedroom window misses one of the four egress numbers in IRC Section R310. Every sleeping room needs an escape window with 5.7 square feet of net clear opening, at least 24 inches tall, 20 inches wide, and a sill no higher than 44 inches. Confirm the current adopted edition with your city.

To add a casita to an existing Arizona home, confirm your zoning allows an accessory dwelling unit, then design it within size and setback limits, run water, sewer, and power to it, and pull a building permit. Under A.R.S. 9-461.18, larger cities must allow at least one detached unit on most single-family lots.

Yes. You can add a casita above or beside an RV garage in Arizona, and the living space usually counts as an accessory dwelling unit (ADU) under A.R.S. 9-461.18 for cities and A.R.S. 11-810.01 for counties. The garage height, fire separation, and your zoning's ADU rules decide what fits.