N2 (Neighbourhood 2) is Ottawa's new zone for low-rise residential areas where duplexes, semi-detached homes, and detached homes coexist — replacing parts of the old R2 designation. N2 is where many Ottawa homeowners look first when considering a duplex conversion or small-scale investment build. This 2026 guide explains the duplex and semi-detached rules, lot and setback minimums, height limits, and how Bill 23's 4-unit permission stacks on top of N2's existing built-form mix.
N2 permits all the principal residential built forms found in N1 plus semi-detached dwellings and duplexes as-of-right. Permitted uses on an N2 lot include: detached dwelling, semi-detached dwelling (two units side-by-side, each on its own freehold lot or shared lot), duplex (two units stacked or side-by-side within one building on one lot), secondary dwelling unit, coach house / detached secondary dwelling, garden suite, plus small group homes, bed-and-breakfasts, and home-based businesses. Und...
For a duplex on N2: minimum lot area typically 270–360 m² (smaller than detached because the lot is shared between two units). Minimum lot frontage: 9–12 m. The two units can be configured as stacked (over/under), side-by-side within one building, or front-back. Each unit requires its own entrance from outside (or shared lobby), separate egress meeting Ontario Building Code, fire-rated separation between units (1-hour FRR minimum, 2-hour for stacked with shared services), separate utilities or s...
Semi-detached differs from duplex in that each unit sits on its own legal lot (party-wall configuration). Two semis share a common wall but are otherwise independent buildings. Minimum lot area per semi unit on N2: typically 200–270 m². Minimum frontage per semi lot: 7.5–9 m. Each semi requires its own water and sewer connection, separate electrical service, and individual building permit. The party wall must be fire-rated (typically 2-hour FRR) and acoustically separated. Semi-detached are comm...
Front yard setback: 4.5–6 m (or matching established streetscape). Rear yard setback: 7.5 m minimum, reduced to 6 m where coach house is permitted with conforming design. Interior side yard: 1.2 m minimum; 1.5 m for 2.5+ storey buildings; 0 m at the party wall for semi-detached. Maximum lot coverage: 45–50% for principal building (slightly higher than N1), plus 15% accessory. Maximum building height: 9–11 m depending on subzone, typically 2.5 storeys with some N2A subzones permitting 3 storeys. ...
Default parking requirements on N2: 1 space per dwelling unit. For a 4-unit configuration (duplex + suite + coach house) you'd need 4 parking spaces — though Ottawa's downtown overlay zones reduce or eliminate parking minimums in N2 areas inside the inner ring. Tandem parking (one in front of another) is permitted. Driveway widths are capped: 3.0 m max for single-car driveways on lots under 14 m frontage; 6.0 m max for double. Front-yard parking is restricted to no more than 50% of the front yar...
Three common N2 conversion projects: (1) Single-family to duplex — typical cost $85,000–$180,000 depending on whether structural changes, second kitchen, and separate utilities are required; permit fees $5,000–$12,000. (2) Existing duplex to triplex or fourplex — requires variance unless N3/N4 zoning; cost $150,000–$350,000+. (3) Single-family to single-family + basement suite + coach house (3 units on N2 as-of-right) — typical project cost $250,000–$450,000 for the coach house plus $65,000–$110...
A duplex is two units within one building on one lot (over-under or side-by-side, single legal title). A semi-detached is two separate buildings sharing a common party wall, each on its own freehold lot. Duplex requires one building permit; semi-detached requires two plus a Consent Application for the lot severance.
Up to 4 dwelling units per lot under Bill 23. Common N2 build-outs: duplex (2) + basement suite + coach house = 4 units, or single-family + basement suite + 2-unit coach house = 4 units. All units need their own permits, egress, and parking.
Typically 270–360 m² depending on N2 subzone, with minimum frontage of 9–12 m. Smaller lots may need a minor variance. Always verify the specific subzone (N2A, N2B, N2C) for your address on GeoOttawa.
You need separate electrical service or sub-metering for each unit (Ontario Electrical Safety Code). Water and gas can be shared with sub-metering, but separate connections add resale value and avoid landlord-tenant utility disputes. Most duplex conversions in Ottawa separate electrical and water; gas is often kept shared.
In some N2 subzones, yes — up to 7.5 m height. In other N2 subzones, the limit is 6.1 m and 1 storey. The 2-storey option typically requires either a permissive subzone (look for N2A urban) or a minor variance. Coach house must also meet rear-yard setback, lot coverage, and parking rules.