Interested in building a casita?

Use these resources to learn more

On December 7, 2021, Mayor and Council adopted an amendment to the Unified Development code to allow Accessory Dwelling Units (ADUs), or casitas, in Tucson. 

What is a casita? These smaller units provide an independent living space on the same lot as a primary unit. They are a way of providing more flexible housing options that can help seniors age in place and support multi-generational living.

What do the new rules allow? The code amendment adopted by Mayor & Council allows:

  • One ADU to be built on any residential lot in the city (any lot with one or two homes)
  • The maximum size of the ADU is up to 10% of the lot size, up to a maximum of 1,000 square feet. All lots are allowed an ADU of at least 650 square feet.
  • The maximum height for ADUs is 12' or the height of the primary structure on lots with two-story homes
  • All other dimensional standards regarding lot coverage and setbacks apply
  • One parking space is required per ADU, which can be waived for sites that are a quarter-mile from transit or a bike boulevard; on-street parking can also be used
  • Each newly constructed ADU is required to have a cool roof

Mayor and Council also directed staff to develop programs to provide resources and technical support to make ADUs accessible and affordable to Tucson homeowners and residents, including a pilot program to fund ADU repairs and improvements, and to establish an amnesty program for unpermitted ADUs.

Learn more with these resources:

  • Use this worksheet to learn more about the regulations, and the process to design and permit a casita
  • Attend an ADU info session hosted by Mi Casita on Wednesday, January 12. Register online