Courtesy images.
FLAGSTAFF — The City of Flagstaff announces the launch of its Accessory Dwelling Unit (ADU) Model Plans Library at www.flagstaff.az.gov/ADUs. The Library contains 10 pre-approved, publicly viewable ADU model plans, while additional plans are currently under review.
ADUs, also known as backyard homes or casitas, are important to the City’s climate and housing goals because these smaller housing units have the potential to offer lower rent and monthly utility costs and increase Flagstaff’s housing supply. These units can also provide more flexible housing options for households of all sizes, generate supplemental rental income for homeowners, and increase housing availability in established, more central neighborhoods.
Model plans will lower the barriers to ADU construction in Flagstaff by reducing the cost to design an ADU, making it easier to find a designer, simplifying the design and permitting process, and providing access to lower City permitting fees for model plans (compared to City fees for custom plans).
Flagstaff community members are invited to view the ADU Model Plans website, which features previews of each pre-approved ADU model plan and detailed information about the City’s ADU design standards and building permit requirements. The City will continue to look for opportunities to expand the ADU Model Plans Library to support the growth of ADUs in Flagstaff. Those interested in building an ADU from the Library can contact the designer and purchase access to the full plans. Residents can then work with the designer to draft a site plan and proceed through the City’s building permit review and approval process.
ADU Model Plan Library designs were selected through a 2025 Request for Informal Proposals (RFIP), which attracted over 30 design proposals. A selection committee of community partners and City staff selected 10 winning designs. Flagstaff residents were invited to vote for their favorites among the 10 winning designs through a Community Choice Award.
For more information on the ADU Model Plans Library, please contact Senior Sustainability Planner Genevieve Pearthree at (928) 213-2156 or Genevieve.Pearthree@flagstaffaz.gov
