Three forces have lined up behind the small, energy-efficient rental in Ottawa — and the open-book model keeps the cost of building one in plain view. Here is how the numbers work, from the first year through twenty. The figures are illustrative; the programs are current.
On a qualifying purpose-built rental of four or more units, the full 13% HST is rebated — 100% of the federal 5% under the Purpose-Built Rental Housing rebate, and 100% of Ontario's 8% portion. Roughly $65,000 back on a $500,000 unit. Conditions: at least 90% long-term rental; construction begun after 13 September 2023 and before 2031; substantially complete before 2036.
Ottawa's new zoning by-law, approved by City Council in January 2026, permits up to four units as-of-right on a serviced urban or suburban lot and removes minimum parking requirements.
CMHC's MLI Select reaches up to 95% of cost and 50-year amortization for energy-efficient rentals of five or more units (best terms at 100 points; minimum 1.10 debt-service coverage). The Apartment Construction Loan Program reaches up to 100% of construction cost, with takeout to MLI Select.
You replace an invisible 12–18% embedded margin with a single transparent fee, capture competitive trade pricing, and one office assembles the incentive stack for you — the rebate, the financing and the energy design, coordinated as one.
| Equity to start | $120,000 (via CMHC MLI Select) — versus ~$424,000 conventional |
| Year-one cash flow | +$17,400 · a 14.5% cash-on-cash return |
| Financing test (DSCR) | 1.15 — clears CMHC's 1.10 floor |
| Operating cost | ~$26,000 per year lower (energy, maintenance and resilience combined) |
Illustrative six-unit example, Ottawa 2026 — not a quote. Figures depend on the lot, design, rents and final CMHC underwriting.
On a six-unit build the HST rebate alone — roughly $65,000 a unit — more than offsets the cost of building to a net-zero standard. The efficient build starts ahead, not behind.
Illustrative. Assumes ~$50,000 net green-build premium per unit largely covered by the ~$65,000-per-unit HST rebate; the surplus, plus MLI Select leverage, reduces the equity you bring. Net premium varies by design and is often reduced further by the financing and design programs below.
Full 13% rebated on qualifying rentals of four or more units — about $65,000 per $500,000 unit.
Up to 95% of cost and 50-year amortization for energy-efficient rentals of five or more units; energy, affordability and accessibility points unlock premium discounts of 10–30%. (Note: CMHC raised multi-unit premiums in July 2025, with a surcharge for amortizations beyond 25 years.)
Construction financing to as much as 100% of cost, 50-year amortization, fixed rates, with automatic takeout to MLI Select.
For new multi-residential construction in the Ottawa service area: a free integrated-design workshop and energy modelling for projects targeting 25% better than code, plus incentives — including up to $45,000 toward airtightness testing.
Illustrative, at ~$26,000 a year in combined operating savings, before energy-price escalation. On top of this sit mortgage paydown and appreciation — not charted here — plus the Year-0 head start from the HST rebate and reduced equity. Actual results vary with design, occupancy, rents and rates.
Tell us about your site and we'll prepare the real numbers — conventional versus net-zero, the financing and the returns — for your lot.
Begin the conversationIllustrative only — not a quote, and not tax or financial advice; consult your own advisor. Based on programs current as of June 2026 (federal PBRH rebate, City of Ottawa zoning, CMHC MLI Select and ACLP, Enbridge Savings by Design), each re-verified at engagement. See our methodology & sources.
