Duplex and triplex are at the heart of Montreal's residential rental stock. Nearly 40% of the city's rental units are in 2-4 unit buildings. For a first investor, it's often the most accessible option: lower entry price than an apartment building, residential financing available, possibility to occupy one unit.
But investing in a Montreal duplex in 2026 requires rigorous analysis — returns are less obvious than 10 years ago, and some mistakes are costly. This article gives the complete grid to evaluate an opportunity.
Montreal duplex market in 2026
Below are price ranges observed in early 2026 for duplexes in good condition in sectors with sustained rental demand:
| Neighbourhood | Duplex price (3+3, 4+4) | Average rent per unit |
|---|---|---|
| Plateau / Mile-End | $850K – $1.4M | $1,700 – $2,400/mo |
| Rosemont / Petite-Patrie | $750K – $1.2M | $1,600 – $2,200/mo |
| Villeray / Parc-Extension | $650K – $1.05M | $1,500 – $2,000/mo |
| Verdun / Sud-Ouest | $700K – $1.2M | $1,600 – $2,200/mo |
| Hochelaga / Mercier-Est | $550K – $950K | $1,350 – $1,850/mo |
| NDG / Côte-des-Neiges | $750K – $1.25M | $1,650 – $2,250/mo |
| Ahuntsic / Cartierville | $600K – $1M | $1,450 – $1,950/mo |
The return calculation BEFORE buying
Step 1 — Annual gross income
Monthly rent per unit × 12 months × number of units. For a 2-unit duplex at $1,800/mo: 2 × $1,800 × 12 = $43,200/yr.
Step 2 — Vacancy and unpaid (reserve)
Reserve 4-8% for vacancy + unpaid. For a well-located duplex: 5% typical. On $43,200: ~$2,160/yr reserve. Net income after vacancy: ~$41,040.
Step 3 — Operating expenses
| Item | Annual estimate (Montreal duplex) |
|---|---|
| Municipal and school taxes | $5,000 – $10,000 |
| Building insurance | $1,200 – $2,500 |
| Routine maintenance | $1,500 – $3,000 |
| Major repair reserve (roof, windows, etc.) | $2,000 – $4,000 |
| Admin / management fees (if delegated) | 5–10% of income |
| Partial energy / snow / landscaping | $500 – $1,500 |
Typical total expenses: $11,000 to $22,000/yr for an average duplex. Say $15,000.
Step 4 — Net operating income (NOI)
Income $41,040 – Expenses $15,000 = $26,040 NOI.
Step 5 — Debt service
For a $900K duplex with 20% down ($180K): $720K loan. At 5.5% amortized 25 yr: monthly payment ~$4,420 × 12 = ~$53,000/yr (principal + interest).
Step 6 — Net cashflow
NOI $26,040 – Debt service $53,000 = ~−$27,000/yr. NEGATIVE cashflow of $2,250/mo — that's the monthly cost the owner-investor carries.
The 4 profitability levers of a duplex
- 1Capital appreciation — Montreal has historically risen 4-6%/yr long term. On a $900K duplex, that's $36K-$54K/yr of unrealized equity gain.
- 2Loan paydown — On a $720K, 25-yr loan, you pay down ~$17K of principal year one (growing each year). Equity created from rent.
- 3Tax optimization — Mortgage interest, taxes, maintenance and depreciation are deductible from rental income. Properly structured, these deductions can bring real taxation very low.
- 4Owner occupancy possibility — If you live in a unit, you save your own rent (typically $1,800-$2,400/mo in Montreal). That totally transforms apparent cashflow.
Down payment and financing
If you occupy a unit (primary residence)
- Minimum down payment: 5% (first $500K) then 10% (above)
- For an occupied $900K duplex: ~$65K minimum
- CMHC mortgage insurance required (premium added to loan)
- Favourable mortgage rate (residential rates)
If you don't occupy any unit (pure investment)
- Minimum down payment: 20% (pure rental property)
- For a $900K duplex: $180K down
- No CMHC insurance
- Commercial mortgage rate (slightly higher)
- Stricter analysis criteria (debt service coverage ratio)
5 mandatory checks before buying
- 1Full inspection by a qualified building inspector ($1,200-$2,500) — roof, foundations, plumbing, electricity, insulation.
- 2Verification of existing leases: term, rents, special clauses, Annex G. You inherit these on possession.
- 3Verification of actual expenses: ask for tax bills, insurance invoices, energy bills for the last 24 months. Not seller estimates.
- 4Zoning/usage compliance: legally recognized number of units (an 'illegal' duplex in a single-family zone is a major risk).
- 5Environmental check if relevant: pyrite, ferrous ochre, vermiculite, asbestos. More frequent in 1950s-1970s buildings.
The 'duplex with potential' trap
Many duplexes are sold with the argument 'tenants in place pay below market — you can raise rents.' Beware:
- You inherit the existing rent + Annex G that makes it enforceable
- Raising rent to a new tenant takes months (F notice + delay + possible TAL)
- 'Future return' is not the return at the time you buy
- Compute your return on CURRENT rents, not projected ones