Cities | Santa Ana

Santa Ana Multiplex Rules 2026: R2 Lots, Apartments, ADUs, SB 9, Rent Stabilization and the Transit Zoning Code

Santa Ana publishes its rules in one Municipal Code on Municode. Chapter 41 holds the zoning districts, ADU and SB 9 sections, parking, affordable housing and the Transit Zoning Code. Chapter 34 holds subdivisions, Chapter 8 the rent stabilization ordinance, and Chapter 30 historic preservation. This page sums up the routes to two, three, four or more homes on a Santa Ana lot, what each allows, and where City text and state law differ. Every section was read in Supplement 33 Update 1, which includes ordinances through No. NS-3097 of July 7, 2026. The seven guide pages below cover each topic in depth.

Santa Ana Guide Pages

Start With State Law

Four state laws set the floor Santa Ana must allow. SB 9 (2021) allows two main homes on a lot in a single-family zone, a split into two lots, or both, approved by staff with no hearing. ADU law sets the accessory dwelling units (ADUs), second homes on a lot, and junior ADUs a city must allow; a junior ADU is a unit of 500 square feet or less inside the house. SB 684 and SB 1123 allow maps of up to 10 lots with 10 homes. SB 79 raises zoning near qualifying rail and bus stops, but only in an "urban transit county," which Government Code 65912.156 defines as "a county with more than 15 passenger rail stations."

HCD's SB 79 advisory lists Alameda, Los Angeles, Sacramento, San Francisco, San Mateo, Santa Clara and San Diego Counties as the places where the upzoning took effect on July 1, 2026. The City's SB 79 page says "Santa Ana is not currently subject to SB 79's provisions as Orange County is not anticipated to qualify as an urban transit county until the OC Streetcar opens for revenue service." SB 9, ADU law and SB 684 all apply in Santa Ana today. Santa Ana wrote SB 9 into Article XX in 2021 and keeps its own ADU sections in Section 41-194. The code has no section on SB 684, so the statute applies on its own terms.

Santa Ana is a charter city, a city that runs under its own local charter. Charter Section 200 gives it "the power to make and enforce all laws and regulations in respect to municipal affairs, subject only to such restrictions and limitations as may be provided in this charter and in the Constitution of the State of California." The SB 9 statutes apply to every city "whether general law or chartered," and the AB 2097 parking statute names "charter cities." The City's SB 79 page says that law "applies to Santa Ana and it does not make an exception for charter cities."

Santa Ana in Numbers

The US Census Bureau's Vintage 2025 city file estimates 315,586 people in the City of Santa Ana on July 1, 2025, up from a 2020 estimates base of 310,534. In that file Santa Ana is the fourteenth largest city in California, after Irvine (318,764) and ahead of Chula Vista (275,533). Orange County has 3,149,507 people in the same file.

Under Charter Section 400, a seven-member City Council governs the city: a Mayor "elected from the City at large" and six members who live in, and are elected by, their wards. Most planning decisions sit below the Council. Staff decide ADUs and SB 9 projects, the Zoning Administrator decides minor exceptions and parcel maps, and the Planning Commission decides conditional use permits, variances, tract maps and, since July 2026, historic preservation matters.

The Routes to More Homes Compared

Sources: Santa Ana Municipal Code 41-194.2, 41-2111 to 41-2117, 41-2105 to 41-2110, Division 4, Division 5, Division 7, 41-668 and Article XIX; Government Code 66499.41.

Districts That Allow Homes

Section 41-184 lists 28 districts. R1 allows "One (1) one-family dwelling with six (6) or fewer bedrooms" on a lot of at least 6,000 square feet. R2 allows one-family and two-family dwellings and townhouses, with 6,000 square feet for the first home "plus an additional three thousand (3,000) square feet for each dwelling unit on the lot in excess of one (1)." By VanPlex arithmetic, that is 9,000 square feet for two homes, 12,000 for three and 15,000 for four. R3 permits apartments sorted into four density classes, capped by the General Plan, and R4 allows garden apartments at 1,500 square feet of lot per home. The zoning districts page has the full table.

The Transit Zoning Code, Specific Development No. 84, covers what the City describes as "the Civic Center, Downtown, Logan, and Lacy neighborhoods." Its UN-2 zone allows "single dwellings, duplexes, triplexes and quadplexes, courtyard housing, rowhouses, and live-work," each as a building type with its own lot width and story limit. The three or more homes page covers these types with R3, R4 and townhouses.

House Lots: ADUs and SB 9

Santa Ana's ADU sections allow ADUs "in all zoning districts where residential or mixed-use development is permitted." A detached ADU may be 1,000 square feet and 20 feet tall, with 4 foot side and rear setbacks. The City text allows one ADU on a house lot; Government Code 66323 requires approval of a converted ADU, a junior ADU and a new detached ADU together, and the statute controls. Parking is one space, with none in seven listed cases such as within one-half mile walking distance of public transit. See the ADUs and SB 9 page.

For SB 9, Santa Ana wrote its own limits in Article XX. Only "individual property owners" may apply, which leaves out LLCs and corporations. Each SB 9 home must be more than 500 and no more than 800 square feet. The owner must live on the lot, and "any net new unit created" must be deed restricted as affordable. The state statute, last amended June 30, 2026, bars standards that do not "apply uniformly to development within the underlying zone," and where the two conflict, the statute controls. The SB 9 lot split needs a lot of at least 2,400 square feet and makes two lots of at least 1,200. The lots and subdivisions page covers the split and small lot subdivisions.

Parking and Setbacks

Parking often sets the size of a Santa Ana project. A house needs four spaces for up to five bedrooms, each home in a duplex or triplex needs three spaces plus one per bedroom over two, and apartments need one covered space per home, one more per bedroom on the site and 25 percent extra for guests. Government Code 65863.2 bars minimum parking within one-half mile of a major transit stop. R1 and R2 houses may be 27 feet and two stories, with 20 foot front yards. See the parking, setbacks and height page.

Tenants, Rent Rules and Historic Homes

Santa Ana's Rent Stabilization and Just Cause Eviction Ordinance limits increases to 3 percent or 80 percent of the local price index change, whichever is less; the City set 2.87 percent for September 1, 2026 through August 31, 2027. Homes with a certificate of occupancy after February 1, 1995 are exempt from the cap. An owner who ends a tenancy to demolish must pay three months of rent as relocation assistance. State laws such as SB 9 do not apply to homes a tenant occupied in the last three years, so tenant history often decides which route is open.

Santa Ana has three National Register districts, Downtown Santa Ana, French Park and Floral Park, and local zoning protection in French Park (SD-19) and Heninger Park (SD-40). Exterior changes to historic structures need a Planning Commission certificate of appropriateness. See the rent stabilization and historic homes page.

Affordable Housing and Fees

The 2021 Affordable Housing Opportunity and Creation Ordinance applies to projects of five or more homes that meet a trigger such as density above the General Plan. Rentals set aside 15 percent for low income households or one of three other mixes, and an in-lieu fee runs from $6 to $15 per square foot of habitable area by project size. The state density bonus applies under Article XVI.I.

Fees come from the City's FY 2026-27 Adopted Miscellaneous Fees Schedule. The park fee is $5,905 for each added two-bedroom home and $7,924 for each three-bedroom home. A conditional use permit is $7,485, a tentative parcel map $6,083 plus $26 per lot, and drainage fees run $5,656 to $10,506 per acre. See the permits and fees page.

A New Zoning Code Is Coming

The City's Comprehensive Zoning Code Update page says "The current Zoning Code was last updated in the 1960s." A public hearing draft is posted, with revisions dated August 21, 2026, and the July 2026 status sheet expects public hearings "in Fall 2026" before City Council approval. Until the Council adopts it, Chapter 41 as described in this guide applies. Check the status before you rely on today's district rules for a purchase.

Where to Go Next

Related on VanPlex: the California rent and tenant rules page and the duplex to fourplex guide.

Frequently Asked Questions

Official sources (checked October 2026)