If you own a home in a Tucson HOA community and you are thinking about building a casita or accessory dwelling unit, this is the most important question to answer before anything else: does your HOA allow it?
Arizona has made significant progress in recent years to protect homeowners’ rights to build ADUs. State law now requires municipalities above a certain size to allow ADUs on qualifying single-family residential lots. But there is a critical limitation that surprises many Tucson homeowners: Arizona’s ADU legislation does not override private HOA restrictive covenants.
That means the state may allow you to build an ADU, your city may allow it, and your lot may be large enough to accommodate one, but your HOA can still say no if its governing documents prohibit or restrict accessory dwelling units.
Here is what every Tucson homeowner in an HOA community needs to know before moving forward.
What Arizona Law Actually Says About ADUs
House Bill 2720, which took effect January 1, 2025, established that municipalities with populations over 75,000 must allow ADUs on single-family residential lots where a dwelling is permitted. The law also limits certain local restrictions, including prohibiting rear and side setback requirements greater than five feet in covered municipalities.
A follow-up bill, HB2928, went further by eliminating impact fees on ADUs under 1,000 square feet and streamlining the permitting process. Together, these two laws have made Arizona one of the most ADU-friendly states in the country.
The practical effect for Tucson homeowners: the City of Tucson, Marana, Oro Valley, and other Pima County municipalities are now required to allow ADUs as a matter of state law. You cannot be denied a permit simply because a city previously had an ordinance against casitas.
But the law applies to government entities, not private associations.
The HOA Exception: Why Private Covenants Still Apply
Arizona’s ADU statutes apply to municipalities and local governments. They do not apply to private homeowners associations or the CC&Rs (Covenants, Conditions, and Restrictions) that govern HOA communities.
According to Gottlieb Law, a Phoenix-based real estate firm that tracks Arizona property law, state ADU legislation “does not override private covenants or restrictions set by HOAs.” That means an HOA can still prohibit ADU construction in its community even where state law and local zoning permit it.
This creates a situation where two homeowners in Tucson can have very different ADU rights based entirely on whether they live in an HOA community and what that community’s governing documents say.
Homeowner A lives in a non-HOA neighborhood. Under HB2720 and Tucson’s updated zoning code, they have a clear legal right to build an ADU on their qualifying lot with a straightforward permit application.
Homeowner B lives in an HOA community. Even if their lot is the same size and the city would otherwise approve the project, their HOA’s CC&Rs may prohibit it entirely.
How to Find Out Where Your HOA Stands
The first step for any Tucson homeowner in an HOA is to read the CC&Rs and any supplemental design guidelines carefully.
You are looking for any language that addresses:
- accessory dwelling units, guest houses, or casitas specifically
- secondary structures on residential lots
- restrictions on residential use or additional living spaces
- design review requirements for new construction
- rental or short-term rental restrictions that might apply to an ADU
HOA documents vary significantly. Some governing documents explicitly prohibit ADUs. Others are silent on the question, which can mean different things depending on how the documents are written and how the board interprets them. Some HOAs allow accessory structures but require design review committee approval before construction.
If the CC&Rs are ambiguous, the HOA’s position on ADUs is best clarified directly with the board or in writing before you invest time and money in plans and permits.
What Happens When the HOA Says Yes
If your HOA permits ADU construction, you typically still have to go through the HOA’s design review process before submitting plans to the city.
Design review committees generally evaluate:
- architectural compatibility with existing homes in the community
- exterior materials, colors, and finishes
- height and setback compliance with community standards
- impact on neighboring properties and sight lines
- landscaping and fencing requirements
Arizona courts have held that if an HOA’s governing documents permit ADUs, the design review committee cannot deny a request without a legitimate reason based on the community’s actual design standards. The denial cannot be arbitrary.
Getting HOA design review approval and city permit approval are two separate processes. Most homeowners work through the HOA review first since it can affect the design, then submit to the city. A builder experienced in Tucson ADU projects can help you understand what each process typically requires and how to sequence the work efficiently.
What Happens When the HOA Says No
If your HOA’s CC&Rs prohibit ADU construction, your options are limited.
You can petition the HOA board to amend the CC&Rs to allow ADUs. Most CC&R amendments require a supermajority vote of homeowners, often two-thirds or three-quarters of all members. This is possible in some communities but requires significant time and community organizing.
You can consult a real estate attorney who specializes in Arizona HOA law to review the specific language of your CC&Rs and whether there are any grounds to challenge a prohibition. Given the ongoing legal uncertainty around how Arizona’s new ADU laws interact with private covenants, this is an area where the law continues to develop.
You can also consider whether your goals for building an ADU might be achievable through a different structure. Some HOAs that prohibit standalone ADUs allow additions to the main home, attached guest suites, or other configurations that serve a similar purpose.
What you should not do is proceed with construction without HOA approval when the CC&Rs prohibit it. An HOA can require you to remove an unpermitted structure at your expense, seek injunctive relief, and pursue legal fees. The financial exposure of building without proper approval far exceeds the cost of getting clarity upfront.
Do not begin construction while an unresolved HOA restriction is in place. A dispute could lead to legal costs or a demand to remove or modify the structure. Get the HOA’s position and legal advice before committing to construction.
Tucson’s Non-HOA Neighborhoods Offer a Different Path
A significant portion of Tucson’s housing stock sits outside HOA communities entirely. These properties, particularly in central Tucson, the Foothills, and many established midtown neighborhoods, are now among the most ADU-friendly residential properties in the state.
Under the current regulatory framework, a homeowner on a qualifying single-family lot in a non-HOA Tucson neighborhood can build an ADU up to 1,000 square feet as a matter of right under state law, subject to the city’s specific development standards for setbacks, lot coverage, height, and parking.
The process is a straightforward permit application. There is no HOA to navigate, no design review committee, and no community vote required. If the project meets the applicable development standards, the permit is issued.
For families considering adding a casita specifically to accommodate parents or relatives who spend winters in Tucson, understanding whether the property is in an HOA community is one of the first questions to answer. Our article on what snowbird families should consider first when building a casita covers the full set of upfront questions worth answering before committing to a project.
What Does a Casita Cost in Tucson?
Once you have confirmed that your property and HOA situation permit ADU construction, the next question is what the project will actually cost.
Cost depends on the size and design, site access, utility connections, permitting, and finish level. As a starting point, Tiny Homes of Tucson’s current published price ranges begin at approximately $125,000 for a studio, $142,000 for a one-bedroom, and $176,000 for a two-bedroom casita. These are starting prices, not a quote for a particular property.
Site conditions that can affect the price include:
- distance to water, sewer, and electrical connections
- electrical service capacity
- grading, drainage, and foundation requirements
- access for construction equipment
- required permits and fees
- HOA requirements that affect exterior materials or design
Get a property-specific estimate before relying on a general range. Utility work and difficult site access can change a project budget substantially.
Financing and HOA Approval
Homeowners commonly explore cash, home equity loans, HELOCs, cash-out refinancing, or renovation financing. Lender requirements vary. Some may ask for HOA approval or other project documentation, so ask the lender what it needs and when. For more detail, our guide on how to finance an ADU in Tucson covers the main options and what questions to ask a lender before committing.
A Practical Order of Operations
For Tucson homeowners in HOA communities who want to explore building an ADU, here is the recommended sequence:
- Get the governing documents. Request the full CC&Rs, bylaws, and design guidelines from your HOA or management company.
- Ask the HOA in writing. Ask whether an ADU is allowed and what review or approval steps apply.
- Confirm the jurisdiction. Determine whether the property is in the City of Tucson, unincorporated Pima County, or another city or town.
- Check property feasibility. Review lot dimensions, setbacks, easements, utilities, drainage, and access before paying for final plans.
- Get professional advice where needed. If the HOA documents are unclear or appear to prohibit an ADU, consult an Arizona attorney before proceeding.
- Coordinate HOA review and permitting. Follow the required sequence for your HOA and jurisdiction, and account for both processes in your schedule.
- Confirm the budget and financing. Use a property-specific estimate and verify lender requirements before committing to construction.
For a detailed legal overview of how Arizona HOA rules interact with ADU construction rights, the analysis at Mulcahy Law Firm’s guide to ADUs in Arizona HOA communities covers the case law and what HOA documents to look for when evaluating your options.
The Key Question for HOA Homeowners
Arizona law has made ADUs easier to pursue in many places, but it has not made every property eligible or overridden every private restriction. If you live in an HOA community, read the governing documents and get the HOA’s position before investing in final plans or permits.
Gottlieb Law’s overview of Arizona’s changing ADU laws provides additional context on how state legislation interacts with HOA rules and what property owners should research before starting a project.
Tiny Homes of Tucson offers complimentary property consultations for homeowners in the Tucson area. We can help you assess site feasibility, discuss likely project costs, and explain the steps involved in HOA review and local permitting. For questions about whether a specific restriction is enforceable, consult an Arizona attorney.
Schedule a complimentary property consultation with Tiny Homes of Tucson to discuss your property and project.