R2 Zoning: What It Means and What You Can Build

R2 zoning (also written R-2) is a residential zoning district that usually allows two-family homes such as duplexes, or a somewhat higher density than R1. There is no national zoning code. Each city or county defines its own R2, so in some places it is a duplex zone and in others it allows only single-family houses.

This guide is written by Pillar, a land research platform. The figures come from each jurisdiction's code or planning department and from state statutes and agency pages, read on November 15, 2026. Codes change, so open the linked section before relying on a number. This is general information, not legal advice; confirm the rules for your lot with a licensed professional in your state.

What does R2 zoning mean?

The "R" means residential. The "2" means whatever the local code says it means. In the five codes we read, it means four different things:

• A two-family zone. Los Angeles calls R2 the "Two-Family Zone" (LAMC section 12.09). Salt Lake City calls R-2 the "Single- and Two-Family Residential District" (section 21A.24.110).
• A building type. Washington, DC's R-2 is for semi-detached houses, the kind that share a wall with one neighbor. Each lot still gets one principal dwelling unit (11 DCMR Subtitle D, sections 101 and 201).
• A density. Fairfax County, Virginia, names R-2 the "Residential District, Two Dwelling Units/Acre". Its purpose statement provides for single-family detached dwellings and affordable dwelling unit developments.
• A single-family zone with smaller lots. New York City limits R1 and R2 lots to single-family detached residences, unless the lot is a "qualifying residential site" (Zoning Resolution section 22-122). Section 12-10 defines the term; its lot-area, transit and frontage test excludes R1 and R2 districts.

What can you build on R2 zoning?

Here are the five codes side by side, for the conventional case. Alternatives and exceptions are in the linked sections.

• Los Angeles, California (R2, Two-Family Zone). Section 12.09 allows any use permitted in the R1 zone, plus a two-family dwelling or two single-family dwellings. Every lot needs a 50-foot width and 5,000 square feet, and the minimum lot area per dwelling unit is 2,500 square feet. Front, side and rear yards are the same as R1's in section 12.08: a front yard of 20% of lot depth, up to 20 feet, subject to a prevailing-setback rule; 5-foot side yards for a building of up to two stories on a lot at least 50 feet wide; and a 15-foot rear yard. Section 12.08 C has the rules for other cases. On a lot outside a Hillside Area or Coastal Zone, section 12.21.1 limits R2 buildings to 33 feet, unless its block-average exception applies or a specific plan, historic preservation overlay zone or subdivision approval sets the height. Apartment houses, boarding or rooming houses and multiple dwellings are allowed only on a lot whose side lot line adjoins a lot in a commercial or industrial zone. The use, "including the accessory buildings and uses and required yards," may not extend more than 65 feet from that zone's boundary, and the RD1.5 zone's lot area per dwelling unit or guest room applies.
• Salt Lake City, Utah (R-2, Single- and Two-Family). Section 21A.24.110, whose ordinance history runs through 2024, says the district's purpose is "to preserve the character of existing neighborhoods which exhibit a mix of predominantly single- and two-family dwellings." A detached house needs 5,000 square feet and a 50-foot width. A two-family dwelling needs 8,000 square feet and 50 feet. A twin home needs 4,000 square feet per dwelling and 25 feet. In subdivisions approved after April 12, 1995, no more than two adjacent lots may be used for two-family dwellings, and no more than three such dwellings may sit on one block face. Height is 28 feet to the ridge of a pitched roof, or the average height of other principal buildings on the block face, and 20 feet for a flat roof. The rear yard is 25% of lot depth, at least 15 feet and no more than 25 required. Building coverage is capped at 45% of the lot for single-family and two-family uses.
• Washington, DC (R-2, semi-detached houses). Subtitle D says a principal building in R-2 must be detached or semi-detached (section 200.4), and allows one principal dwelling unit and one accessory apartment per lot of record (section 201.1). To create a new lot of record, a semi-detached structure needs 30 feet of width and 3,000 square feet; all other structures need 40 feet and 4,000 square feet (Table D 202.1). Inclusionary developments have separate tables. Height is 40 feet and 3 stories, not counting a penthouse or rooftop structure. The rear yard is 20 feet. A semi-detached building needs one 8-foot side yard and a detached building needs two. Lot occupancy is 40% for structures other than places of worship and public recreation centers, and at least 30% of the lot must be pervious surface.
• Fairfax County, Virginia (R-2, two dwelling units per acre). Subsection 2102.5 caps density at 2 dwelling units per acre. A conventional subdivision lot needs at least 15,000 square feet, with an 18,000-square-foot average, and a width of 100 feet on interior lots and 125 feet on corner lots. For single-family dwellings on conventional lots, setbacks are 35 feet front, 15 side and 25 rear, and the height limit is 35 feet.
• New York City (R2). Section 22-122 limits residential uses in R1 and R2 districts to single-family detached residences on zoning lots that are not qualifying residential sites. Section 23-11, last amended December 5, 2024, requires 2,850 square feet and a 30-foot width for a detached residence in R2. The floor area ratio for a standard zoning lot is 0.75, and on a standard lot of 4,000 square feet or more the floor area of any one dwelling unit can't exceed a ratio of 0.60.

Can you build a single-family home in R2?

Yes, in all five codes. Los Angeles carries every R1 use into R2. Salt Lake City sets a 5,000-square-foot lot minimum for a detached house. DC's 4,000 square feet is the minimum for creating a new lot of record, not a test of every existing lot. Fairfax County's R2 is a single-family district. In New York City's R2, the single-family detached limit applies to lots that are not qualifying residential sites.

Can you build a duplex in R2?

It depends on the code and the lot.

• Los Angeles: yes, on a lot with 2,500 square feet of area per unit. Section 12.09 C.4 lets a lot narrower than 50 feet or smaller than 5,000 square feet be used for any permitted use, except uses requiring more than 5,000 square feet, if it "was held under separate ownership or was of record at the time this article became effective." A two-family dwelling is never allowed on a lot smaller than 4,000 square feet.
• Salt Lake City: yes, on 8,000 square feet, subject to the adjacency limit above.
• Washington, DC: no. Each lot gets one principal dwelling unit. The second unit is an accessory apartment, covered below.
• Fairfax County: the purpose statement names only single-family detached dwellings and affordable dwelling unit developments, so read the county's use tables.
• New York City: no, unless the lot is a qualifying residential site, where section 22-122 permits any type of residence.

Accessory units and state law can add a unit. The ones we read:

• Washington, DC. One accessory apartment may be established in an R zone. It is allowed as a matter of right in a principal dwelling or an accessory building, except in the R-1B/GT and R-3/GT zones, subject to section 253's conditions. In R-2, either the principal dwelling or the apartment must be owner-occupied, and no more than three people may occupy the apartment. For an apartment inside the house, the house needs at least 1,200 square feet of gross floor area, not counting garage space, and the apartment may take no more than 35% of the house's gross floor area. An added entrance may not be on a wall that faces a street (Subtitle U, section 253).
• California ADU law. The Department of Housing and Community Development's March 2026 ADU Handbook says "a structure with two or more attached dwelling units on a single lot is considered a multifamily dwelling structure," so a duplex follows the multifamily ADU rules. The handbook says up to two detached ADUs are allowed on a lot with a proposed multifamily dwelling, and up to eight on a lot with an existing one, not to exceed the number of existing units, subject to 4-foot side and rear setbacks and height limits (Government Code section 66323(a)(4)).
• California SB 9. HCD's SB 9 fact sheet says the parcel "must be located in a single-family residential zone," and that parcels in multifamily and other zones are not subject to SB 9 even if they allow single-family homes. As we read it, that leaves a two-family zone such as Los Angeles R2 outside SB 9, but the city decides which of its zones qualify, so ask.

What is the difference between R1 and R2 zoning?

R2 is the next step up from R1 in each of these codes, but the step differs:

• Los Angeles: the lot minimum stays at 5,000 square feet and the yards are the same. What changes is the lot area per dwelling unit, from 5,000 square feet in R1 to 2,500 in R2, which allows a second unit.
• Washington, DC: R-1 requires a detached building. R-2 adds semi-detached buildings and smaller new lots: 30 feet and 3,000 square feet for a semi-detached structure, against 50 feet and 5,000 square feet for all structures in R-1B. The unit count per lot does not change.
• Fairfax County: both are single-family detached districts. The conventional minimum lot drops from 36,000 square feet in R-1 to 15,000 in R-2, and density rises from 1 to 2 dwelling units per acre.
• New York City: on zoning lots that are not qualifying residential sites, both are limited to single-family detached residences. The minimum lot for a detached residence drops from 4,750 square feet and 50 feet wide in R1-2 to 2,850 square feet and 30 feet in R2.

What is the difference between R2 and R3 zoning?

R3 allows more housing types than R2 in three of these four codes:

• Los Angeles: the Department of City Planning's zoning summary, updated January 2026, lists R3 as the "Multiple Dwelling" zone: R2 uses plus apartment houses and multiple dwellings, with 800 square feet of lot area per dwelling unit on a 5,000-square-foot lot. Section 12.21.1 caps height at 45 feet in the parts of R3 that are in Height District 1.
• Washington, DC: R-3 adds row buildings. A new lot for a row structure needs 20 feet of width and 2,000 square feet, and a single household row building may occupy 60% of its lot.
• New York City: on lots that are not qualifying residential sites, two-family residences first appear in the R3 districts, as we read section 22-122. R3-1, for example, allows single- or two-family residences, detached or semi-detached.
• Fairfax County: R-3 is still a single-family detached district, at 3 dwelling units per acre with a 10,500-square-foot conventional minimum lot.

Which R2 uses need special approval?

Some uses need a discretionary approval, and its name differs by place.

• Los Angeles. R2 inherits R1's list, which includes conditional uses enumerated in section 12.24 "when the location is approved pursuant to the provisions of said section."
• Washington, DC. Some uses need a special exception from the Board of Zoning Adjustment. Subtitle U section 203.1 lists them, including an accessory apartment that does not meet section 253 and a clerical or religious group residence for more than 15 people.

Our guide to conditional use permits explains the process. Relief from a setback or height standard is a different request; see zoning variances.

How do you look up a parcel's zoning and read the R2 rules?

Los Angeles. The Department of City Planning's ZIMAS brochure gives the steps:

1. Go to zimas.lacity.org and search by address, street intersection, assessor parcel number or legal description.
2. Expand the Planning and Zoning tab to see the underlying zone.
3. Check whether the site is in a Specific Plan Area or Overlay Zone, which can carry additional restrictions.
4. Open section 12.09 for R2, then section 12.08 for the yards it borrows from R1 and section 12.21.1 for height.

Washington, DC. The Office of Zoning's handbook page for the Residential (R) zones gives each zone's purpose and links it to the official zoning map and to the regulation text. Then read Subtitle D chapter 2 for dimensions and Subtitle U for uses. Write down the full label, including suffixes: R-2/FH is not plain R-2, as the next section shows.

What should a land buyer or developer check on an R2 lot?

Unit yield. Do the arithmetic from the code, not the label. Take a 7,500-square-foot lot, 50 feet wide, and compare base allowances only. Yards, height, parking and approvals still decide what fits.

• In Los Angeles, 7,500 divided by 2,500 square feet per unit is 3. But the use list allows a two-family dwelling or two single-family dwellings, so as we read it the base allowance is 2 units before any ADUs, assuming the lot does not adjoin a commercial or industrial zone.
• In Salt Lake City, a two-family dwelling needs 8,000 square feet. The base rules allow 1 detached house here, before any accessory unit the code allows.
• In DC, section 201.1 permits one principal dwelling unit and one accessory apartment per lot of record, subject to Subtitle U. The lot's area and width do not settle whether an apartment meets section 253.

Nonconforming lots and buildings. A lot or building can predate today's minimums. Los Angeles's rule for undersized lots is summarized above. Salt Lake City treats the coverage of buildings that legally existed on April 12, 1995 as legal conforming. Ask the planning office what can be rebuilt or enlarged.

Parking. In Los Angeles, section 12.21 A.4 sets base ratios: two parking spaces for each one-family dwelling, and one to two for other dwelling units depending on the number of habitable rooms. In R2, at least one required space per unit must be in a private garage. The same subdivision lets residential buildings replace 10% of required car parking with bicycle parking and exempts some projects, so check which apply.

Overlays. An overlay can change the base numbers. For an ordinary house in DC's R-2/FH zone, the Forest Hills Tree and Slope Protection overlay lowers lot occupancy from 40% to 30% and raises the pervious surface minimum from 30% to 50% (Subtitle D sections 404 and 405). The 30% cap does not cover public recreation and community centers. The 50% rule may not preclude enlarging a principal building that existed on May 18, 2007, or make a structure nonconforming. See impervious surface limits for how such caps work.

Rezoning. If R2 doesn't allow the project, the usual routes are a rezoning or a planned district. Start with the adopted plan; our guide to zoning vs. future land use explains how the two maps relate. A planned unit development is the site-specific alternative. If the lot adjoins a business district, read what commercial zoning allows too.

Deal documents. The zoning label comes from the jurisdiction's zoning map and code, not from the listing. Confirm it with the planning office during due diligence. Then read the deed, the title commitment's exceptions, the recorded plat and any covenants, because private restrictions are separate from zoning and can be stricter.

Pillar's map layers show zoning alongside floodplain, wetlands, utilities and future land use over parcel boundaries. Coverage varies by dataset, and a map label is not the code, so confirm anything decisive with the jurisdiction.

Quick answers

What does R2 zoning mean? A residential district, one step denser than R1 in the codes above. It is a two-family zone in Los Angeles and Salt Lake City, a semi-detached house zone in DC, and a single-family zone in Fairfax County. In New York City's R2, residential uses are limited to single-family detached homes on lots that are not qualifying residential sites.

Can you build a duplex on R2? In Los Angeles, with 2,500 square feet of lot area per unit, and in Salt Lake City on 8,000 square feet. Not in DC's R-2, and not on a New York City R2 lot unless it is a qualifying residential site.

What is the minimum lot size in R2? There is no standard. In the conventional standards above it runs from 2,850 square feet in New York City to 15,000 in Fairfax County.

What is R2 zoning in California? Each city defines its own. Los Angeles's R2 is a two-family zone with a 5,000-square-foot minimum lot. State ADU law applies on top; SB 9 applies only in single-family residential zones.

What is the difference between R1 and R2? In Los Angeles, R2 halves the lot area required per unit, which allows a second home. In DC and Fairfax County, the R2 examples above allow smaller lots but not a second principal unit. The same holds in New York City on lots that are not qualifying residential sites.

Can you build apartments on R2? Los Angeles allows them in R2 only on a lot whose side lot line adjoins a lot in a commercial or industrial zone, subject to the 65-foot and RD1.5 conditions above. Elsewhere, read the district's use table.