ADUs and guest homes in Arizona

In most of Arizona, yes. House Bill 2720 took effect in January 2025 and requires cities to allow accessory dwelling units on single-family lots, and HB 2928 extended ADU rules to unincorporated county land. Local zoning still sets details like setbacks and height, and HOA or CC&R limits still apply. Bring us your address and we will check what your lot allows before you spend a dollar.

Detached gives the most privacy and the most design freedom. Attached shares a wall, which keeps utility runs short and family close. A garage conversion starts with a shell that already exists, so there is less to build. The right answer comes off your lot, your budget and who is living there. That is exactly what the free consultation is for.

Not always. Water, sewer and power can usually extend from the main house, and some owners add separate metering where their city and utility allow it. We plan the runs during design so trenching happens once and the yard only gets opened one time.

It depends on the type and the city. A garage conversion moves faster than a detached casita because the shell already exists, and permit timelines vary across the Valley. Design and permitting run first, then the build. At your consultation we map a realistic calendar for your project instead of quoting a number we would have to walk back.

That depends on your city's rules and your HOA. Some areas allow long-term rentals, and short-term rules vary widely. We build it right either way, but check the rules for your address before you plan around rental income. We can point you to the right office to ask.

All of it. Kelso Custom Builders takes ADU projects from the first sketch through drawings, engineering, city permitting, construction and the final walkthrough. One licensed builder, AZ ROC #318269 and #243160, one point of contact from dirt to keys.