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Tucson casita questions, answered
A direct answer up top, then the details and the cases where it depends. Rules and numbers are dated and sourced to Arizona and local agencies.
Updated October 2026
How much does an ADU cost in Tucson?
2026 cost guide figures for Tucson, the extras they leave out, and impact fees.
Read the guideWhat are the casita rules in Tucson in 2026?
The 2024 Tucson amendment, the state floor and the model plan library.
Read the guideCan I build a casita outside Tucson city limits?
Oro Valley, Marana, Sahuarita and unincorporated Pima County compared.
Read the guideWill my HOA allow a casita in the Tucson area?
Why HOA covenants still apply after the city or county says yes.
Read the guideHow much rent can a casita earn in Tucson?
Current Tucson rents by unit size and the rental rules that apply.
Read the guideHow do I keep a casita cool in Tucson?
Record heat, shade, roofs and cooling for a small desert building.
Read the guideNeed an answer for one parcel?
The guides cover general rules. For a parcel-specific answer, send the address.