If you own a single-family home in Ottawa, your property has quietly become more valuable since 2022. Most homeowners do not realize it, because the change happened in Toronto at Queen's Park, not on a City of Ottawa committee agenda.
The change is Bill 23, the More Homes Built Faster Act, 2022. It rewrote what residential property owners are allowed to do across Ontario. The headline number: up to three residential units on most lots, as-of-right. No public hearing. No variance. No "neighbour's letter to the Councillor."
Here is what Bill 23 actually says, what "as-of-right" actually means, and the math on what your Ottawa lot can now produce.
What Bill 23 Did, in Plain Terms
Bill 23 amended the Planning Act to set a province-wide minimum: every residential lot zoned for a single-detached, semi-detached, or row house must allow up to three residential units. Municipalities cannot zone these out. Ottawa updated Zoning By-law 2008-250 to comply, and the new rules are now baked into the City's residential zones.
The three units can be:
- Three units inside the existing house (basement, main floor, second floor as separate suites)
- Two units inside the existing house plus one detached (a coach house or garden suite)
- Three units inside a new triplex built on the lot
The Province also told municipalities they cannot impose the old constraints that used to kill these projects: no separate parking minimum for the second and third unit, no extra lot-area requirement, no minimum unit size beyond what the OBC already requires.
What "As-of-Right" Actually Means
This is the phrase that confuses homeowners the most. As-of-right means you are entitled to build it without asking permission of your neighbours, the local Councillor, or the Committee of Adjustment. You still need:
- A building permit
- BCIN-certified design drawings
- Compliance with the Ontario Building Code (egress, fire separation, sound transmission)
- Compliance with the still-applicable zoning rules: setbacks, lot coverage, height, floor area
- ESA electrical permit and inspection
- Plumbing permit if you are adding fixtures
What you do not need: a zoning variance, a public hearing, or anyone's discretionary approval. The City reviews the permit on technical grounds only.
Heads up
"As-of-right" is not "no rules." Setbacks (6m front, 1.2m side, 7.5m rear in most R1) and lot coverage (35% in R1) still apply. If your three-unit plan pushes you over coverage, you still need a Committee of Adjustment minor variance. Bill 23 removed the unit-count barrier; it did not remove the building envelope.
Eligible Ottawa Neighbourhoods
The honest answer is: most of them. Bill 23's three-unit allowance applies to any lot in a residential zone that previously permitted a single-detached, semi-detached, or row house. In Ottawa that captures:
- R1 (single-detached) zones across the city: Barrhaven, Kanata, Orleans, Stittsville, Riverside South, Manor Park, Alta Vista, Hunt Club
- R2 (semi-detached and duplex) zones: large parts of Westboro, Hintonburg, Carlington, Vanier
- R3 (row house) zones: townhome-heavy pockets in newer suburbs
- R4 (multi-unit low-rise) zones: most of the urban core, though these zones already permitted higher densities
Where it does not apply: heritage-designated properties under Part IV of the Heritage Act often have more restrictive overlays. Properties in conservation authority regulated areas (Rideau River, Ottawa River floodplains) still need separate approval. Lots subject to specific exception zones may have local restrictions.
Setback, Coverage, and Height Implications
The building envelope did not change with Bill 23. On a typical R1 lot in Ottawa you still have:
- Front yard setback: 6m (or matching the average of adjacent houses in mature-neighbourhood overlays)
- Side yard setback: 1.2m on each side
- Rear yard setback: 7.5m
- Lot coverage: 35% maximum (all roofed structures, including detached garage and coach house)
- Height: 11m maximum to the peak of the roof
- Floor area ratio: often capped at 0.50 to 0.65 depending on lot size
For a coach house or detached additional unit specifically, Ottawa permits up to 80 m² of gross floor area, height capped at 6.5m for the rear-yard structure, with its own setback rules from the rear property line (usually 1.2m).
Parking: The Quiet Win
Pre-Bill 23, adding a basement apartment in Ottawa often meant adding a parking space, which on most lots is impossible without paving the front yard. The Province removed the per-unit parking requirement for the additional units. You now need to provide parking only as the original zoning required for the principal dwelling. The second and third unit are exempt.
This is the change that quietly unlocked thousands of Ottawa basements. Lot owners who previously could not legalize a basement suite because they had no second parking space can now apply.
The Income Case on a Real Ottawa Lot
Take an actual scenario we run for clients monthly: a 1970s split-level in Barrhaven, R1 zone, 50 ft x 100 ft lot, 1,800 sq ft above grade, full unfinished basement.
Before Bill 23, the as-of-right configuration was: one principal dwelling, plus possibly one secondary dwelling unit in the basement (if parking permitted), plus possibly a small coach house. Each layer required separate justification.
Today, the same lot allows three units as-of-right. A typical execution:
- Main floor stays as a 2-bedroom owner unit
- Upper floor is converted into a separate 2-bedroom unit with private entrance
- Basement is legalized as a 1-bedroom unit with egress windows and fire separation
Two rented units on a single-family property generate steady monthly rental income against a one-time renovation outlay. The size of that outlay is driven by scope: how many kitchens and bathrooms you are adding, the extent of egress and fire-separation work, electrical and plumbing changes, sound-rated assemblies, separate entrances, and finish level. We build each scenario as a detailed written breakdown so the income side and the construction side sit on the same page before any commitment.
The point of the analysis is the relationship between rental income and renovation scope: even after operating costs, vacancy, and financing, a well-planned three-unit conversion can pay back its construction over a defined horizon, with the rest showing up as appreciation on the property's increased value as a multi-unit asset. We run those numbers honestly for your specific address rather than a generic rule of thumb.
"Bill 23 turned every R1 single-family home in Ottawa into a potential triplex on paper. The math has changed enough that 'should I move or renovate' is now genuinely a different question."
What Bill 23 Did Not Do
It is worth being honest about the limits.
- It did notuto.557f2555">notuto.557f2555">notuto.557f2555">notuto.557f2555">not override the Ontario Building Code. Egress, fire separation, sound transmission class (STC 50), insulation values, and ventilation requirements all still apply to every unit you add.
- It did not remove the need for a permit. Every additional unit needs to be permitted, drawn by a BCIN designer, and inspected.
- It did not change conservation authority rules, heritage rules, or floodplain rules.
- It did not exempt you from development charges. Ottawa charges Bill 23-related fees that scale with new floor area and additional units; these vary and are billed at permit issue.
- It did not override condo rules, restrictive covenants, or the Residential Tenancies Act's tenant-rights framework if you are renting.
How to Find Out What Your Lot Can Carry
The four documents that determine your lot's three-unit potential:
- Zoning certificate from the City of Ottawa: confirms zone (R1, R2, etc.), any exceptions, and any overlay zones
- Survey or current Site Plan: confirms actual lot dimensions, easements, and existing structures
- Title and parcel register: confirms there are no restrictive covenants registered on title
- Conservation authority overlay map: RVCA or MVCA, depending on watershed
We pull these as part of our free 48-hour lot feasibility review. The deliverable tells you the maximum buildable envelope, the maximum number of as-of-right units, and an honest estimate of construction cost and rental income.
The Bottom Line for Ottawa Owners
Bill 23 is the biggest residential zoning change in a generation. It created on-paper rights that most homeowners are still not exercising, partly because they do not know the change happened, and partly because the Ontario Building Code requirements for legal multi-unit conversion are non-trivial.
The opportunity is real, especially in Ottawa's older inner suburbs where lot sizes are generous and original housing stock is approaching the age where major renovation makes sense anyway. If you are already considering a basement finish, an addition, or a coach house, do the analysis as a three-unit project from day one. The marginal cost of "doing it right for legalization" is much smaller than coming back later.
For a real numbers conversation about your specific address, call 613-862-4555 or fill in the consultation form.