Multi-family real estate runs from a duplex to a large apartment building, and the financing, valuation and management change sharply as the unit count rises, especially between four and five units. This page covers the unit-count thresholds, financing options including CMHC’s MLI Select, debt service coverage, management at scale and the tax basics. It is part of WealthNorth’s guide to real estate investing in Canada.
Unit Count Thresholds in Canada
| Property Type | Units | Mortgage Type | CMHC Eligible? | Owner Occupancy Required? |
|---|---|---|---|---|
| Duplex | 2 | Residential | ✅ (CMHC regular) | For residential CMHC only |
| Triplex | 3 | Residential | ✅ (CMHC regular) | For residential CMHC only |
| Fourplex | 4 | Residential | ✅ (CMHC regular) | For residential CMHC only |
| 5-unit building | 5 | Commercial | ✅ (CMHC MLI Select) | ❌ Not required |
| 6 to 49 units | 6 to 49 | Commercial | ✅ (CMHC MLI Select) | ❌ Not required |
| 50+ units | 50 or more | Commercial | ✅ (CMHC MLI Select) | ❌ Not required |
Financing comparison
| Financing | Maximum loan | Underwriting basis | Amortization |
|---|---|---|---|
| CMHC homeowner insurance (2 to 4 units, you live in one) | 95% of value for 2 units; 90% for 3 or 4 | Your income, plus part of the rent | Up to 25 years (30 for first-time buyers or new builds) |
| Conventional mortgage (2 to 4 units, you don’t live there) | 80% of value | Your income, plus part of the rent | Set by the lender |
| Conventional commercial mortgage (5+ units) | Set by the lender | The building’s income and debt service coverage | Set by the lender |
| CMHC MLI Select (5+ units) | Existing buildings: up to 85% at 50 points, up to 95% at 70 points or more | The building’s income, plus the MLI Select score | Up to 40, 45 or 50 years at 50, 70 or 100 points |
CMHC MLI Select: how the points work
MLI Select insures mortgages on rental buildings of 5 or more units (retirement homes need more). Borrowers score points for commitments in three areas:
| Category | What earns points |
|---|---|
| Affordability | Keeping a share of units at rents below set affordability limits, with a 10-year commitment |
| Energy efficiency | Lower energy use and greenhouse gas emissions than a reference building |
| Accessibility | Accessible units or a building designed to accessibility standards |
More points allow a higher loan-to-value, a longer amortization and lower insurance premiums. New construction can borrow up to 95% of cost at every points level. Premiums are published in CMHC’s fee schedule and change from time to time, so confirm them with the lender or CMHC.
Debt Service Coverage Ratio (DSCR)
DSCR is a core credit measure for financing buildings of five or more units, including CMHC-insured MLI Select loans.
DSCR = Net Operating Income (NOI) ÷ Annual Debt Service (mortgage payments)
Below 1.00, the building’s income doesn’t cover its mortgage payments. Each lender, and CMHC for an insured loan, sets a minimum ratio for the loan it will make, so the DSCR the building supports caps the size of the mortgage. Ask the lender for its minimum before making an offer.
Valuing a multi-family property
An appraiser can value a property from recent sales of similar properties or from its income: net operating income divided by the market’s cap rate. The income approach matters most for buildings of five or more units, which lenders finance on the building’s income and debt service coverage. When a building is valued on its income, raising rents or cutting operating costs raises its value, which is the basis of value-add investing in apartment buildings. How to calculate and read a cap rate is covered in cap rate explained, and a full income statement for a specific property in the rental property calculator.
Management at scale
| Scale | Common approach |
|---|---|
| 2 to 4 units | Self-management, especially if you live on site |
| Roughly 5 to 20 units | A third-party property manager, paid a percentage of rent plus leasing fees |
| Larger buildings | A resident or part-time superintendent plus a management company, or an in-house team |
Whatever the size, pricing management into the numbers from the start shows whether the building works without your unpaid time. The costs and trade-offs are covered in the property management guide.
Small Multi-Family vs Large Multi-Family
| Factor | Duplex / Triplex / Fourplex | 5–20 Unit Building | 20+ Unit Building |
|---|---|---|---|
| Entry capital | Lower: residential financing | Moderate-high | High |
| Effect of one vacancy | Large: a quarter to a half of the rent | Smaller | Smallest |
| Management complexity | Low | Medium | High |
| Financing | Residential mortgage | Commercial or CMHC multi-unit | Commercial or CMHC multi-unit |
| Main underwriting basis | Your income, plus part of the rent | The building’s income and DSCR | The building’s income and DSCR |
Bottom Line
Multi-family investing in Canada often follows a progression: a duplex or triplex bought with owner-occupied financing, then two- to four-unit rentals with a conventional mortgage, then buildings of five or more units financed on their own income once the debt service coverage supports it. Each step spreads the income over more units but needs more capital, commercial underwriting and management. CMHC’s MLI Select offers a higher loan-to-value and a longer amortization in exchange for affordability, energy efficiency or accessibility commitments. Pricing professional management into the numbers from the first property shows whether a building works without your unpaid time.
House hacking a duplex, triplex or fourplex
Living in one unit of a two- to four-unit building unlocks insured owner-occupied financing and a smaller down payment, while the other rents offset your housing cost. Worked examples and the tax treatment are in house hacking.
Finding Multi-Family Properties
| Source | Notes |
|---|---|
| MLS / Realtor.ca | Filter by property type (duplex, triplex, fourplex) |
| Real estate agent | Look for multi-family specialization |
| Off-market deals | Direct outreach to owners |
| Driving for dollars | Spotting poorly maintained multi-unit buildings |
| Investor networking | Local meetups and online communities |
Due Diligence Checklist
| Check | Why |
|---|---|
| Zoning | Confirm the property is legally zoned as multi-family |
| Permits | Verify all renovations and conversions are permitted |
| Current rents | Are they at market rate or below? |
| Leases | Review terms, tenant stability, and renewal dates |
| Actual expenses | Use real numbers, not pro forma estimates |
| Building condition | Professional inspection is essential |
Tax considerations
Rental income from every unit is taxable after expenses, reported on Form T776; see how rental income is taxed. If you live in one unit, shared costs are split between your unit and the rented ones, usually by floor area: in a fourplex with four equal units, three-quarters of shared costs are rental expenses. The principal residence exemption can cover your own unit on sale, while the rented units produce a capital gain. Capital cost allowance on the building is optional and recaptured on sale. Holding a larger building in a company is covered in real estate investing in a corporation.
Exit Strategies
| Strategy | When It Makes Sense |
|---|---|
| Hold long-term | Strong cash flow and appreciation; build wealth over 10–20 years |
| Refinance | Access built-up equity for the next property without selling |
| Sell | Capture gains when the market peaks or you want to redeploy capital |
Canada has no equivalent of the US 1031 exchange for rental property: selling one building to buy another triggers tax on the gain.
Getting Started: First Multi-Family Checklist
| Step | Action |
|---|---|
| 1 | Get pre-approved for a mortgage (residential if house hacking) |
| 2 | Learn your target market: rents, vacancy rates and recent sales |
| 3 | Network with local real estate investors |
| 4 | Analyze many deals before committing to one |
| 5 | Make offers with inspection and financing conditions |
| 6 | Complete thorough building inspection |
| 7 | Close, set up tenant management systems, and execute |
Related reading
- BRRRR strategy, often used to add value to small multi-unit buildings
- Joint venture real estate, for pooling capital on a larger building
- Commercial real estate investing
- Buying a multiplex
Sources
The figures and rules on this page come from these sources, last checked against them on September 25, 2026. How we check facts.
- CMHC: CMHC Purchase
- CMHC: MLI Select
- Department of Finance Canada: Boldest mortgage reforms in decades come into force today
- OSFI: Residential mortgage underwriting practices and procedures