N3 (Neighbourhood 3) is the new mid-density residential zone in Ottawa's Comprehensive Zoning By-law, designed to accommodate townhomes, triplexes, stacked townhomes, and small multi-unit infill. If you own an N3 lot or are scouting infill development opportunities, the rules here open up significantly more build options than N1 or N2. This 2026 guide covers what you can build on N3, lot and setback minimums, height limits, density bonuses, and the most common N3 project types Ottawa developers and homeowners pursue.
N3 builds on N2's permissions and adds: townhouses (street townhouses, block townhouses, back-to-back townhouses), triplexes, fourplexes within one building, stacked townhouses (3-storey townhouses with units stacked), small low-rise apartment buildings up to specified heights, and rooming houses (subject to licensing). All N1/N2 uses remain permitted on N3. Bill 23 still applies — every N3 lot permits at least 4 units as-of-right, with N3 typically permitting 6–8 units in townhouse or small mul...
For townhouse configurations on N3: minimum lot area per unit typically 130–200 m². Minimum frontage per unit: 5.5–7.5 m (street townhouses) or 0 m for block-townhouse interior units. Maximum row length: typically 6–8 units in a single row before a break is required (varies by subzone). Each townhouse unit requires its own street-facing entrance OR a shared lobby for block-townhouse internal units, individual parking (1 space per unit minimum, 0.5–1 visitor space per 3 units), and party-wall fir...
Triplex and fourplex configurations within a single building are permitted as-of-right on N3 — this is one of the major N3 advantages for investors. A triplex on N3 typically requires: minimum lot area 360–500 m², minimum frontage 12–15 m, maximum 3 storeys / 11 m height, parking 1 space per unit (3 total), and bicycle parking 0.5 per unit. Fourplexes within one building: lot area 450–600 m², frontage 13–16 m, 3 storeys / 11–12 m height. Both triplex and fourplex require dedicated waste and recy...
Front yard setback: 3.0–5.0 m (smaller than N1/N2 to encourage walkable streetscapes). Rear yard setback: 6.0–7.5 m. Interior side yard: 1.2 m minimum; 0 m at party wall for attached units. Corner yard: 3.0 m. Maximum lot coverage: 50–60% for principal building plus 15% accessory. Maximum height: 11–14 m typically, 3 storeys, with some N3A subzones permitting 4 storeys for stacked townhouse configurations. Floor space index (FSI): typically 1.0–1.5 on N3, which is higher than N1/N2 and reflects ...
Parking: 1 space per townhouse / multiplex unit, with reductions in inner-urban transit-overlay zones (some N3 sub-zones in central neighbourhoods reduce parking minimums to 0.5 per unit or eliminate them entirely). Bicycle parking: 0.5–1.0 per unit, secured/covered. Loading: not generally required for residential under 12 units. Servicing capacity is the most common N3 build constraint — small-diameter water mains in older neighbourhoods may not support a triplex/fourplex without a service upgr...
Typical N3 development projects in Ottawa (2026 costs): (1) Single-family demolition + 4-unit townhouse infill: $1.6M–$2.6M total construction, $1.0M–$1.8M land. (2) Existing duplex conversion to triplex on N3: $145,000–$280,000 (adding one unit). (3) Single-family + coach-house triplex (4 units total): $380,000–$650,000. (4) Vacant N3 lot to 6-unit block townhouse: $2.4M–$4.0M. ROI depends heavily on Ottawa rental rates, condo-vs-rental disposition strategy, and whether you self-manage. Triplex...
Yes — townhouses (street, block, back-to-back, and stacked) are permitted as-of-right on N3 subject to lot, setback, height, and parking rules. N3 was designed specifically to enable townhouse and small-multiplex infill. Most townhouse projects on N3 don't require zoning variances.
Typically 11–14 m and 3 storeys, with some N3A subzones permitting 4 storeys for stacked townhouse configurations. Heights above the subzone limit require a minor variance from the Committee of Adjustment.
A fourplex on N3 has 4 units within one building, with as-of-right approval (lot/setback/parking permitting). With a coach house added, you can reach 5 units (4 in the principal building + 1 coach house) under Bill 23. Beyond 5 units typically requires N4 zoning or a rezoning.
Usually not, if your lot meets minimum area (360–500 m²), frontage (12–15 m), height (11 m), setbacks, and parking (3 spaces) rules. About 40–55% of N3 triplex projects in Ottawa proceed as-of-right; the rest need a minor variance for setback, height, or parking relief.
Default is 1 parking space per townhouse unit, plus 0.5–1 visitor space per 3 units. Inner-urban N3 subzones in transit-overlay areas reduce parking minimums to 0.5 per unit or eliminate them entirely. Verify your subzone before designing the parking layout.