Ottawa Areas | South End
Missing Middle in Barrhaven
Barrhaven sits about 17 km southwest of downtown and is one of Ottawa's fastest-growing areas, with a 2021 census population of 103,234 (census figure). Under four units as-of-right, a serviced Barrhaven lot can carry a multiplex without a rezoning.
What Barrhaven Lots Look Like
One of Ottawa's fastest-growing areas
Barrhaven sits about 17 km southwest of downtown. Its 2021 census population was 103,234, with much of the recent growth in the south end around Half Moon Bay and Stonebridge.
New south-end subdivisions
The Half Moon Bay area, once open land south of the Jock River, is now a family suburb of new homes. South Barrhaven is guided by the city's Barrhaven South Community Design Plan.
Suburban transect, mostly serviced
Barrhaven is in the city's Suburban transect. Established neighbourhoods are on full municipal water and sewer — the servicing the four-unit as-of-right rule assumes.
Much of the new growth is in the south end around Half Moon Bay and Stonebridge, guided by the city's Barrhaven South Community Design Plan. These newer lots tend to be larger than Ottawa's older core lots, which gives a fourplex more room inside the zone envelope.
Which N-Zone, and How Many Units
The March 2026 zoning reform replaced the old R-zones with size-based Neighbourhood (N) zones. Most Barrhaven streets sit in the base N1 zone, which carries the four-unit baseline. Lots along main streets like Strandherd or Greenbank can fall in higher N-zones — N2 in the six-unit range, N3 around ten — without a rezoning. Confirm the exact N-zone for your lot on geoOttawa.
Best For
- ✓ Owners of a serviced Barrhaven lot who want to add units without a rezoning.
- ✓ Builders working the growing south end around Half Moon Bay and Stonebridge.
- ✓ Anyone wanting larger newer lots that fit a fourplex form cleanly.
Usually Fails When
- ✕ The lot is on the rural fringe south or west of Barrhaven, on septic.
- ✕ A new-subdivision or condo rule restricts added units on the parcel.
- ✕ You want more units than your N-zone allows — that still needs a rezoning.
What To Verify Before Spending Money
- → Your lot is on full municipal water and sewer, not septic.
- → Your Neighbourhood (N) zone and its lot-area and frontage standards on geoOttawa.
- → Whether a subdivision or condo agreement limits the number of units.
Frequently Asked Questions
Can I build a fourplex in Barrhaven?
What zoning applies to a Barrhaven multiplex?
Is a multiplex allowed in new Half Moon Bay subdivisions?
Do I need parking for a Barrhaven fourplex?
Next: run the numbers on a specific Barrhaven lot with the feasibility guide, or start at the Ottawa Missing Middle hub.
Official Sources Referenced
Coming to Ottawa
Get Early Access When VanPlex Launches in Ottawa
We model missing middle multiplex feasibility lot-by-lot. Join the Ottawa early-access list and we'll tell you what your lot can build under Zoning By-law 2026-50 the day Ottawa goes live.