Tucson Real Estate, Buying a Home with a Guest House or ADU
This Glasheen Real Estate listing has a beautiful Guest House, often called a Casita. If you are interested in this listing, click on the photo for the property’s website.
Buying a home with a guest house is becoming more common across Tucson, Oro Valley, and the Foothills. These extra spaces, often called Accessory Dwelling Units (ADUs), offer flexibility for family, visitors, and creative uses that add long-term value.
What counts as a guest house or ADU?
In the Tucson area, an ADU can be:
A separate small building with its own entrance and utilities
A converted garage or studio apartment
A basement or attached suite with its own kitchen and bath
Local zoning and permitting determine whether it qualifies as an ADU or simply a guest quarters, so buyers should always verify with the city or county.
Why does a guest house add value?
Multi-generation living – A separate space for parents, adult children, or long-term guests
Home office or studio – Ideal for working from home, art, or wellness uses
Private guest space – Visitors have comfort and independence
Potential rental opportunity – Some properties allow long-term rentals if local rules and HOA covenants permit
Always confirm city and HOA rules before planning any rental use.
What to review during due diligence?
Permits and zoning – Verify the structure was legally built and meets zoning for an ADU or guest quarters.
Utilities – Check if the ADU shares utilities or has separate meters for power, water, and gas.
Septic or sewer – Confirm capacity if the property is on septic.
Access and parking – Review driveway layout, gate placement, and guest parking rules.
Insurance – Ask your insurance provider if the ADU affects your policy type or coverage limits.
Rental rules – If you intend to rent, confirm whether the city, county, or HOA has restrictions.
Financing notes
Lenders often treat ADUs differently based on whether they generate income. If the unit is permitted and self-contained, it may count toward appraised value. Work with a lender familiar with ADUs and local appraisal practices to avoid surprises.
Common questions
Can I use the guest house as an Airbnb?
Short-term rentals are subject to local and HOA rules. Always confirm regulations directly with the city or HOA management.
Does it increase property taxes?
Possibly. The assessor includes all livable square footage, so expect a modest increase depending on size and permits.
Can I build or expand later?
Check with the city or county development office for current ADU size limits, setbacks, and permit timelines.
Considering a home with a guest house or planning to add one in Tucson
Work with Kristen Glasheen, REALTOR®, MRP, your trusted partner for Tucson Real Estate across Oro Valley, Marana, Vail, Sahuarita, and the Foothills, to name a few.
Contact Kristen
☎️ Call: 520.345.9360
📱 Text: 520.345.9360
📧 Email: kristen@glasheenrealestate.com
Disclaimer
This guide is general information, not legal or financial advice. Zoning and rental regulations vary by jurisdiction and can change. Always confirm directly with local authorities and your advisors.