Santa Ana | Zoning Districts

Santa Ana Zoning Districts: R1, R2, R3, R4, Townhouses and the Transit Zoning Code

A zoning district is the label the City puts on each lot, and it decides which buildings may go there and how big they may be. Santa Ana's districts are in Chapter 41 of the Santa Ana Municipal Code, read here in Supplement 33 Update 1, which includes ordinances through No. NS-3097 of July 7, 2026. This page explains each district that allows homes, how many homes fit on a lot in each, and where the code is about to change. The Santa Ana overview sums up the whole guide.

How Santa Ana Divides Its Land

Section 41-184 lists 28 districts. Five carry most homes: RE Residential-estate, R1 Single-family residence, R2 Limited multiple-family residence, R3 Medium-density multiple-family residence and R4 Suburban apartment. Others are commercial (P, GC, C1, C1-MD, C2, C4, C5, CR, C-SM), industrial (M1, M2), open space (O), agricultural (A1) and military (MO). Six names come from the Transit Zoning Code: TV Transit Village, DT Downtown, UC Urban Center, CDR Corridor, UN-2 Urban Neighborhood 2 and UN-1 Urban Neighborhood 1. Three more are tools that replace or change the normal rules: SP Specific plan, SD Specific development and OZ Overlay zone.

A suffix is a letter or number added after a district name on the zoning map that changes the rules for those lots. Section 41-185 names four. The B suffix lets the lot be used only for parking. A number before and after the district name sets a minimum lot width and lot area. The OZ suffix lets an owner build under an adopted overlay ordinance instead of the base rules. The F suffix caps the floor area ratio, which is the building's floor area divided by the lot area, at 1.0.

One rule frames every district. Section 41-190 (e) says every new building must sit on a lot created under the subdivision rules, "and in no case shall there be more than one (1) dwelling or other principal structure on one (1) lot except as provided herein." So a second home on a lot needs a district rule, or a state law, that allows it.

The Residential Districts Compared

Source: Santa Ana Municipal Code Division 2, Division 3, Division 4, Division 5, Division 6 and Division 7 of Article III, Chapter 41, Supplement 33 Update 1.

R1: One House, Plus What State Law Adds

R1 permits "One (1) one-family dwelling with six (6) or fewer bedrooms" (Section 41-232). A house with seven or more bedrooms needs a conditional use permit, a permit decided at a public hearing where the City may add conditions (Section 41-232.5). The minimum lot is 6,000 square feet with 50 feet of street frontage, but a lot from a legal subdivision that is smaller may still hold a house if it has at least 4,000 square feet and 40 feet of frontage (Section 41-237). Structures may cover no more than 35 percent of the lot (Section 41-238).

Section 41-239 adds design rules that shape a second building. Driveways must lead to a garage and may not be wider than the garage or half the lot width at the street. Accessory buildings may not cover more than 35 percent of the required rear yard and may not exceed half the floor area of the main house, but both of those limits exclude accessory dwelling units. A detached two-car garage may reach 440 square feet, a required three-car garage 640 and a required four-car garage 840.

The extra homes on an R1 lot come from state law. Section 41-194.2 allows one accessory dwelling unit (ADU) and one junior ADU on a lot with a house, and Article XX allows an SB 9 two-unit project or an urban lot split. The ADUs and SB 9 page covers both, including where Santa Ana's text is stricter than state law. A lot in R1 may also carry a PD suffix, which requires a conditional use permit and at least 6,000 square feet of land per home (Sections 41-355 and 41-356).

R2: Homes by Lot Area

R2 is where small multiplexes fit by right, which means with a staff check and no hearing for the use itself. Section 41-247 permits one-family dwellings, two-family dwellings and townhouses. A two-family dwelling is "a single building containing not more than two (2) families living independently of each other," with a common roof and shared walls (Section 41-52). The number of homes depends on lot area. Section 41-247.6 asks for 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 on that rule, two homes need 9,000 square feet, three need 12,000 and four need 15,000. A lot with two or more homes also needs 75 feet of street frontage, against 50 feet for one home (Section 41-247.7). No more than two homes, other than townhouses, may be attached together (Section 41-252), so a third or fourth home sits in a separate building at least 15 feet from the other main buildings (Section 41-254). Each home needs a private patio or deck of at least 100 square feet, 8 feet in each direction (Section 41-255).

R2 has the same 27 foot, two story height limit as R1 (Section 41-248), but structures may cover up to 50 percent of the lot (Section 41-248.5). Front yards are at least 20 feet. When two detached houses share a site, the front yard of the rear house, where it faces the rear yard of the front house, may be 10 feet (Section 41-249). Single-family homes in R2 follow the R1 design standards, and townhouses follow Division 6 (Section 41-246).

R3 and R4: Apartments

R3 permits every R2 use and "Multiple-family dwellings" (Section 41-259). Its rules sort an apartment project into a class by density, counted as homes per acre of site: class I up to 22, class II above 22 and up to 35, class III above 35 and up to 60, and class IV above 60 (Section 41-260). The density "shall not exceed the density limit, if any, prescribed by the general plan" (Section 41-261), so the General Plan land use map sets the real ceiling. Small sites face a further limit in Section 41-262, explained on the three or more homes page.

R4, the Suburban Apartment district, "is authorized to provide for garden apartment development" (Section 41-291). It permits bungalow courts and apartment houses (Section 41-292). Lot area sets the count: 1,500 square feet of lot per home in a building of one to three stories and 500 square feet per home at four stories or more (Section 41-300). Buildings, driveways, parking and covered patios may use no more than half the lot, and the other half must be landscaping, recreation space and walkways (Section 41-301).

Townhouse developments have their own standards in Division 6, which apply wherever townhouses are permitted. Section 41-160 defines a townhouse as a home "located in a group of three (3) or more attached dwelling units with no dwelling unit located above or below another and with each dwelling unit having its own exterior entrance." The site must be at least 12,000 square feet with 100 feet of street frontage, and the code asks for 3,000 square feet of lot per home (Sections 41-274 and 41-275).

Suffixes and Special Districts

Several tools let the City set rules for one area or one project. The PRD (Planned Residential Development) suffix may be added to RE, R1, R2, R3, R4, CR or P land. Any development under it needs a conditional use permit, "The number of dwelling units shall be as indicated by the base district," and no more than half the lot may be buildings, driveways and parking (Sections 41-589 to 41-591). The SP district carries out an adopted specific plan, a detailed plan for one area that the City adopts by ordinance (Section 41-592.1). The SD, or Specific Development, district and suffix sets uses and standards for one area through its own ordinance (Section 41-593.1). The City lists the specific developments, SD-1 through SD-97, on its Specific Development List page, which notes that SD-93 "was rescinded by Ordinance of the City Council."

The OZ suffix adds "alternative standards and regulations to the underlying zoning district" (Section 41-595.1). It matters for housing because the small lot subdivision rules in Section 41-2102 name the Metro East Mixed Use Overlay Zone (OZ-1) as one of the places where small lots may be created.

The Transit Zoning Code Neighborhoods

The Transit Zoning Code, Specific Development No. 84 (SD-84), is Article XIX of Chapter 41. The City's TZC page says it "generally includes the Civic Center, Downtown, Logan, and Lacy neighborhoods." It is a form-based code, which regulates the shape and placement of buildings by building type more than by use. Section 41-2006 sets nine zones: Transit Village, Government Center, Downtown, Urban Center, Corridor, Urban Neighborhood 2, Urban Neighborhood 1, the Industrial Overlay and Open Space.

The two neighborhood zones matter most for small multiplexes. Section 41-2006 says UN-2 suits "single dwellings, duplexes, triplexes and quadplexes, courtyard housing, rowhouses, and live-work." UN-1 is "intended to strengthen and stabilize the low intensity nature of these neighborhoods," with houses, duplexes, triplexes, quadplexes and live-work named as its building types. Table 2A lists single dwellings and multi-family dwellings as permitted in both. Table BT-1 then limits the duplex, triplex and quadplex building type to lots 50 to 125 feet wide and at least 100 feet deep, at 10 to 15 homes per acre, and its note 6 says "Quadplex not permitted in the UN-1 zone." The three or more homes page has the full building type rules.

On June 17, 2025, the City Council approved permanent SD-84 rules on industrial uses, which the City says took effect on July 17, 2025, per the TZC timeline page. Those rules are in Supplement 33 Update 1 under Ordinance NS-3081.

Where the Code Disagrees With Itself

Many Chapter 41 sections date from Ordinance NS-455 of June 20, 1960, and have been amended since, so some parts no longer match. Where a general rule and a district rule conflict, the specific district rule is the one written for that case. Ask the Planning Division when a project depends on any of these points.

• The name of R2. Section 41-184 calls R2 "Limited multiple-family residence," the Division 4 heading and Section 41-246 call it "two-family residence," and Section 41-589 calls it "multiple-family residence." The district rules in Division 4 control what R2 allows.
• How height is measured. The definition in Section 41-29 measures building height "from the curb level to the highest point of the roof surface." The R1, R2 and townhouse sections measure "from the lowest adjacent grade of the structure to the top of the structure." The district sections are the specific rule.
• The R3 small-site formula. Section 41-262 (h) says "the numerator of which is the actual size of the development site" and then "the numerator of which is forty-five thousand five hundred sixty (45,560) square feet." Section 41-260 uses 43,560 square feet, the area of one acre. On a 12,000 square foot class I site, VanPlex arithmetic gives 5.79 homes with 45,560 and 6.06 with 43,560.
• Missing sections. Section 41-303 points to "section 41-295" for R4 plan approval, but Section 41-295 is reserved. Section 41-602 lists an "R3H" district, which Section 41-184 does not establish.
• UN-1 quadplexes. Table UN1-1 in Section 41-2015 lists "Duplex/Triplex/Quadplex" at two stories in UN-1, while note 6 of Table BT-1 says quadplexes are not permitted there.

The Zoning Code Update in Public Hearings

Santa Ana is replacing Chapter 41. The City's Comprehensive Zoning Code Update page says "The current Zoning Code was last updated in the 1960s" and posts a public hearing draft with a list of revisions. That list, dated August 21, 2026, describes a draft rule for apartments built under the old multi-family districts on land "rezoned to districts corresponding to current General Plan land use designations adopted in April of 2022." Under the draft, those buildings "shall not be deemed to be nonconforming by sole reason that the existing residential density" exceeds the new limits.

The City's July 2026 status sheet says public hearings are "anticipated in Fall 2026" and that the draft will then go to "final consideration and approval by the City Council." The draft had not been adopted on October 9, 2026. Every rule on this page is the code in force today. A project filed after the new code takes effect will follow the new districts, so check the adoption date before you buy land on the strength of today's R2 or R3 rules.

Where to Go Next

Related on VanPlex: the duplex to fourplex guide, the SB 9 page and the Santa Ana overview.

Frequently Asked Questions

Official sources (checked October 2026)