Tucson Legalized Fourplexes in January. Now It's Drawing the Plans.
Tucson's middle housing design contest closes Sept. 7, 2026: 15 winning duplex-to-fourplex plans at $1,000 each join the city's pre-approved library.
Up to four units are legal on most Tucson residential lots as of January 1. What is missing is drawings — and the city is paying $1,000 apiece for fifteen winning sets, with submissions due September 7.
Can you build a fourplex on an ordinary Tucson residential lot? Since January 1, 2026, on most of them, yes — along with a duplex, a triplex, a townhouse or a cottage court. Seven months on, the thing deciding whether any of it gets built is not in the code. It is what a set of drawings costs. The city is running a competition, closing September 7, aimed squarely at that cost.
- 4 units
- Maximum in one building or on one lot under Tucson's middle housing code — accessory dwelling units are not counted toward it
- Jan. 1, 2026
- Effective date of the citywide code amendment, with rural residential zoning excluded
- 15 × $1,000
- Winning entries and prize in the 2026 Middle Housing Design Competition
- Sept. 7
- Submission deadline — individuals and firms may enter up to four designs each
What the January Code Change Did
Mayor and Council adopted the middle housing amendment to the Unified Development Code on a 6-1 vote following a public hearing on December 16, 2025, and it took effect January 1, 2026. It permits duplexes, triplexes, fourplexes, townhomes and cottage courts on residential lots across the city, with rural residential zoning carved out — eligible residential zoning everywhere inside a 243-square-mile city, rather than a pilot district. Middle housing is defined as up to four units in one building or on one lot, and an accessory dwelling unit does not count toward that four. The deadline was not Tucson's own: House Bill 2721, signed in May 2024, required Arizona cities of 75,000 or more to adopt a middle housing ordinance by January 1, 2026, or have middle housing allowed with no local standards attached at all.
Legal Is Not the Same as Buildable
A code amendment changes what a lot may hold. It does not change what construction documents cost, and on a small project that gap is the entire decision. A triplex behind a midtown bungalow — four units on the lot, which is the ceiling — still needs a site plan, elevations, structural and energy compliance and a trip through plan review, and none of that work scales down just because the building is small. Pre-approved plans attack exactly that: a design that has already cleared review once does not have to clear it from scratch again. It is the cheapest lever a city has, because it costs the applicant nothing and the city almost nothing.
The Competition Closing September 7
Planning and Development Services is running the 2026 Middle Housing Design Competition with AIA Southern Arizona, funded by a 2026 AARP Community Challenge grant. Fifteen winning entries receive $1,000 each. Designers keep the rights to their own work, and the winning designs are added to the city's library of pre-approved plans. Individuals and firms may submit up to four designs, and submissions close Monday, September 7, 2026. Staff and AIA architects held an in-person feedback session on August 11 at the Sentinel Building, 320 N. Commerce Park Loop, reviewing draft entries against the criteria before the deadline.
Tucson has run this play before, at smaller scale. Its Casita Model Plan Competition, launched in August 2023 with AARP funding, drew 63 submissions from 46 designers, and a jury scoring accessibility, construction innovation, contextual fit and water efficiency picked ten winners at $1,000 apiece. Those ten now sit in the Casita Model Plan Library, an online repository of pre-approved model plans, with their model-plan review fees waived. The middle housing competition is the same mechanism pointed at a bigger building.
Two Things to Check Before This Applies to Your Lot
The first is jurisdiction. This is the City of Tucson's code, and it governs land inside the city. Oro Valley, Marana, Sahuarita, South Tucson and unincorporated Pima County each write their own, so a Catalina Foothills, Vail or Green Valley address is not covered by any of the above — and plenty of parcels with Tucson mailing addresses sit outside the city limits. Pull the parcel on Pima County's GIS map to confirm which jurisdiction it falls in before assuming anything, because the mailing address will not tell you.
The second is what is recorded against the lot. Zoning states what a jurisdiction permits; recorded covenants, conditions and restrictions are a separate private layer running with the parcel, and a zoning amendment is not the document that resolves them. On a platted subdivision lot, read the recorded CC&Rs before pricing a second unit. On an older midtown or infill lot, check whether the parcel is inside a historic preservation zone, which carries its own design review on top of the base zoning.
Quick reference (August 12, 2026): the City of Tucson's Middle Housing Design Competition closes Monday, September 7, 2026. Fifteen winning entries receive $1,000 each and are added to the city's pre-approved plan library; individuals and firms may submit up to four designs. Full rules, eligibility and submission requirements are published by City of Tucson Planning and Development Services — confirm current details there before entering, and confirm adopted zoning standards with PDSD before relying on any figure here for a specific property.
The Rule Change Behind the Fourplex
The consequential part of January's change was never the fourplex itself. It was that Tucson stopped treating a second, third or fourth unit as an exception that has to be argued for, and started treating it as something the code expects. What gets built between now and September 7 is the next layer: a shelf of drawings that turns permitted into quotable. For an owner sitting on one of the deep midtown lots this code was written around, that shelf is the difference between a zoning fact and a project someone will actually price — and how full it ends up is being decided in the next four weeks.
Sources
TucsonSentinel.com — "Tucson holding feedback session on Middle Housing designs this week | Political calendar" — tucsonsentinel.com/local/report/081026_political_calendar/tucson-holding-feedback-session-middle-housing-designs-this-week/ — accessed August 12, 2026 (for the September 7 submission deadline, the fifteen winning entries at $1,000 each, designers retaining rights, the up-to-four-designs limit, and the August 11 feedback session from 4 to 6:30 p.m. at the Sentinel Building, 320 N. Commerce Park Loop). City of Tucson Planning and Development Services — "Feedback Session Scheduled for Middle Housing Design Competition" — tucsonaz.gov/Departments/Planning-Development-Services/PDSD-News/Feedback-Session-Scheduled-for-Middle-Housing-Design-Competition — accessed August 12, 2026 (for the in-person design feedback session held with AIA Southern Arizona for the 2026 competition). City of Tucson Planning and Development Services — "City of Tucson Receives AARP Community Challenge Grant to Launch Middle Housing Design Competition" — tucsonaz.gov/Departments/Planning-Development-Services/PDSD-News/City-of-Tucson-Receives-AARP-Community-Challenge-Grant-to-Launch-Middle-Housing-Design-Competition — accessed August 12, 2026 (for the 2026 AARP Community Challenge grant funding the competition and the partnership with AIA Southern Arizona). City of Tucson Planning and Development Services — "Tucson Expands Housing Options with Middle Housing Code Amendment Approval" — tucsonaz.gov/Departments/Planning-Development-Services/PDSD-News/Tucson-Expands-Housing-Options-with-Middle-Housing-Code-Amendment-Approval — accessed August 12, 2026 (for the December 16, 2025 public hearing, the 6-1 Mayor and Council vote, the January 1, 2026 effective date, the rural residential exclusion, and middle housing defined as up to four units excluding accessory dwelling units). AZPM — "Tucson to allow duplexes, triplexes, townhouses in most city neighborhoods" — news.azpm.org/p/azpmnews/2025/12/17/227701-tucson-to-allow-duplexes-triplexes-townhouses-in-most-city-neighborhoods/ — accessed August 12, 2026 (for duplexes, triplexes, fourplexes, townhouses and cottage courts permitted in residential areas citywide except rural residential). Arizona Daily Star (tucson.com) — "Tucson's 'middle housing' plan to span entire city" — tucson.com/news/local/government-politics/article_564191fa-fb13-419c-bc9f-8ddabbbd2f28.html — accessed August 12, 2026 (for the change encompassing the city's 243 square miles). Arizona State Legislature — "HB 2721: municipal zoning; middle housing" (Senate Engrossed) — azleg.gov/legtext/56leg/2R/bills/HB2721S.pdf — accessed August 12, 2026 (for the statutory text of the middle housing mandate). Scottsdale REALTORS® — "The Pros & Cons of Arizona's 'Missing Middle' Housing Bill: HB 2721" — scottsdalerealtors.org/2024/06/27/the-pros-cons-of-arizonas-missing-middle-housing-bill-hb-2721/ — accessed August 12, 2026 (for the bill's May 2024 signing, the 75,000-population threshold, and the January 1, 2026 adoption deadline with middle housing otherwise allowed absent local standards). Arizona Daily Star (tucson.com) — "10 winning casita designs are ready for Tucsonans to build" — tucson.com/news/local/government-politics/tucson-casita-design-competition-adus-affordable-housing/article_d0e63c52-84d6-11ee-b293-db41de5f6fd0.html — accessed August 12, 2026 (for the Casita Model Plan Competition's 63 submissions from 46 designers, the jury criteria, the ten winners at $1,000 each funded by AARP, the Casita Model Plan Library of pre-approved model plans, and the waived model-plan review fees). City of Tucson — "Middle Housing" planning initiative page — tucsonaz.gov/Departments/Planning-Development-Services/Planning-Initiatives/Middle-Housing — accessed August 12, 2026 (for current code materials and competition information). Details are current as of August 12, 2026; competition rules, deadlines and adopted zoning standards change, so confirm current status with City of Tucson Planning and Development Services, or with the Town of Marana, Town of Oro Valley, Town of Sahuarita or Pima County Development Services for property outside Tucson city limits, before relying on any single figure. Nothing here is legal, tax or engineering advice, and it is not an offer to sell or a solicitation of an offer to purchase real estate. Kyle Berglund and Tierra Antigua Realty fully support and comply with the Fair Housing Act and the Equal Opportunity Act.
Topics
- Local Real Estate News
- Tucson
- Middle Housing
- Zoning
- Unified Development Code
- Accessory Dwelling Units
- Home Building