When building a real estate portfolio in Montreal, one of the most common questions investors face is whether to buy a triplex or a fourplex.
Both property types can offer strong long-term potential, rental income, and opportunities to build equity. But they do not perform the same way, and the better option depends on your budget, financing, investment strategy, risk tolerance, and long-term goals.
In this guide, Plex Guru compares triplexes and fourplexes so you can better understand which type of property may be the right fit for your portfolio.
What Is a Triplex?
A triplex is a residential building containing three separate dwelling units.
In Montreal, triplexes are especially common in established neighbourhoods and often feature:
- Three separate apartments
- Exterior staircases
- Balconies
- Brick or stone facades
- Separate entrances
- Shared or individual heating systems
A triplex can be purchased as a fully rented investment property or as an owner-occupied property where the buyer lives in one unit and rents the other two.
What Is a Fourplex?
A fourplex contains four separate residential units within the same property.
Like triplexes, fourplexes can vary significantly in size, layout, condition, and rental income.
Fourplexes generally offer:
- Four rental units
- Higher gross rental income potential
- Greater income diversification
- More tenant management
- Higher operating expenses
For investors focused on scaling their portfolios, the additional unit can make a meaningful difference over the long term.
1. Purchase Price
The first major difference between a triplex and a fourplex is usually the purchase price.
In the same neighbourhood and similar condition, a fourplex will often cost more because it contains an additional income-producing unit.
However, purchase price alone should not determine which property is the better investment.
You should compare:
- Purchase price
- Total rental income
- Operating expenses
- Financing costs
- Required renovations
- Potential appreciation
A more expensive fourplex may produce stronger financial results if the additional rental income justifies the higher acquisition cost.
2. Rental Income
Rental income is one of the biggest advantages of a fourplex.
With four units instead of three, the property has an additional source of monthly income.
For example:
Triplex Example
- Unit 1: $1,600/month
- Unit 2: $1,500/month
- Unit 3: $1,400/month
Total monthly income: $4,500
Total annual income: $54,000
Fourplex Example
- Unit 1: $1,600/month
- Unit 2: $1,500/month
- Unit 3: $1,400/month
- Unit 4: $1,350/month
Total monthly income: $5,850
Total annual income: $70,200
The fourplex generates more gross revenue, but it will also usually have higher expenses.
3. Vacancy Risk
One important advantage of having more units is better income diversification.
If one unit becomes vacant in a triplex, you temporarily lose one-third of your rental units.
If one unit becomes vacant in a fourplex, you lose one-quarter.
This can make a fourplex slightly more resilient to vacancies.
However, vacancy risk also depends heavily on:
- Neighbourhood
- Unit condition
- Rental pricing
- Tenant demand
- Property management
4. Financing
Financing is one of the most important considerations when comparing a triplex and a fourplex.
Both can often fall within residential financing categories depending on the property and how it will be occupied.
Lenders may consider:
- Your personal income
- Your existing debts
- Your credit profile
- Rental income from the property
- Your down payment
- Whether you will occupy one of the units
Because a fourplex produces more rental income, it may sometimes support a larger mortgage.
But the higher purchase price may also require more cash and stronger qualification.
5. Down Payment
The amount of down payment required can vary based on whether the property is owner-occupied or purchased strictly as an investment.
Owner-occupants may have access to different financing options than investors purchasing a fully rented building.
When comparing a triplex and a fourplex, make sure you understand:
- Minimum down payment
- Mortgage insurance eligibility
- How rental income will be calculated
- Required cash reserves
The better investment is not necessarily the property with the lower down payment. It is the one that produces the strongest overall result for your capital.
6. Cash Flow Potential
A fourplex often has stronger gross income potential, but cash flow should always be calculated after expenses.
A basic formula is:
Rental Income – Operating Expenses – Mortgage Payments = Cash Flow
Operating expenses may include:
- Municipal taxes
- School taxes
- Insurance
- Repairs
- Maintenance
- Utilities
- Snow removal
- Landscaping
- Property management
A triplex purchased at the right price may produce better cash flow than an overpriced fourplex.
This is why investors should compare actual numbers rather than assuming that more units automatically means a better investment.
7. Maintenance Costs
A fourplex generally has more systems, fixtures, appliances, and tenant spaces to maintain.
Potential maintenance items include:
- Plumbing fixtures
- Electrical systems
- Heating equipment
- Doors
- Windows
- Balconies
- Stairs
- Common areas
The additional unit means there are simply more components that may eventually require repair or replacement.
That said, many major expenses such as the roof and foundation are shared across the entire building, so adding another unit does not necessarily increase every expense proportionally.
8. Property Management
Managing four tenants instead of three may not sound like a major difference, but it can create additional work over time.
You may deal with:
- More leases
- More rent payments
- More maintenance requests
- More tenant communication
- More move-ins and move-outs
If you plan to manage the property yourself, consider how much time you are willing to dedicate to landlord responsibilities.
If you use professional property management, include those costs in your financial analysis.
9. Owner-Occupancy
Both triplexes and fourplexes can work well for owner-occupants.
This strategy allows you to live in one unit while rental income from the other units helps offset your mortgage and operating expenses.
In a triplex, you would potentially have two rental units.
In a fourplex, you would potentially have three.
The extra rental income from a fourplex can make owner-occupancy particularly attractive for buyers focused on reducing their personal housing costs while building equity.
10. Scalability
If your long-term goal is to build a larger real estate portfolio, a fourplex may offer greater scalability.
One acquisition gives you four units instead of three.
Over several purchases, the difference becomes more significant.
For example:
- Three triplexes = 9 units
- Three fourplexes = 12 units
The additional units can increase rental income and accelerate portfolio growth.
11. Appreciation Potential
Both triplexes and fourplexes can benefit from long-term appreciation.
Appreciation depends more on location, land value, building condition, and market demand than simply the number of units.
Important factors include:
- Neighbourhood desirability
- Access to public transportation
- Rental demand
- Property condition
- Future development
- Lot size
A well-located triplex may appreciate more strongly than a fourplex in a weaker location.
12. Renovation Opportunities
Renovations can improve both property value and rental income.
A fourplex provides one additional unit where improvements may generate higher rents.
Common renovations include:
- Kitchens
- Bathrooms
- Flooring
- Windows
- Lighting
- Heating systems
- Balconies
- Exterior improvements
However, renovating four units instead of three also requires more capital.
13. Tenant Turnover
With more units comes a greater likelihood that one tenant may move out in any given year.
Turnover costs can include:
- Cleaning
- Painting
- Repairs
- Advertising
- Temporary vacancy
Fourplex owners should budget accordingly.
14. Operating Efficiency
Fourplexes can sometimes benefit from economies of scale.
For example, one roof protects four units instead of three.
Other shared costs may include:
- Foundation
- Landscaping
- Snow removal
- Exterior maintenance
- Insurance
This can make the cost per unit more efficient in some fourplex properties.
15. Resale Market
Triplexes and fourplexes can attract different types of buyers.
Triplexes may appeal to:
- Owner-occupants
- First-time real estate investors
- Small portfolio investors
Fourplexes may attract:
- More experienced investors
- Portfolio builders
- Buyers seeking higher rental income
The size of the future buyer pool should be considered as part of your exit strategy.
16. Risk Profile
Neither a triplex nor a fourplex is automatically lower risk.
Risk depends on:
- Purchase price
- Debt level
- Building condition
- Tenant quality
- Cash reserves
- Rental demand
- Interest rates
A heavily financed fourplex with weak cash flow can be riskier than a well-purchased triplex with strong reserves.
17. Entry-Level Investors
For buyers purchasing their first income property, a triplex may offer a slightly more manageable entry point.
Potential advantages include:
- Lower purchase price
- Lower renovation exposure
- Fewer tenants
- Simpler management
This can make a triplex an attractive first step into multi-unit real estate.
18. Experienced Investors
Investors who already understand property management and financing may prefer the additional scale of a fourplex.
The extra unit may provide:
- Higher total rental income
- Better income diversification
- Greater portfolio growth
- More potential value from renovations
19. Triplex vs. Fourplex Comparison
| Factor | Triplex | Fourplex |
|---|---|---|
| Number of Units | 3 | 4 |
| Typical Purchase Price | Lower | Higher |
| Rental Income Potential | Strong | Higher |
| Management | Less complex | More complex |
| Vacancy Diversification | Moderate | Better |
| Maintenance | Lower overall | Potentially higher |
| Portfolio Scalability | Good | Very good |
| Owner-Occupancy Potential | Excellent | Excellent |
20. Which One Is Better for Your Portfolio?
The right choice depends on your personal strategy.
A Triplex May Be Better If:
- You are purchasing your first plex
- You have a smaller acquisition budget
- You want fewer tenants to manage
- You plan to live in one of the units
- You want a simpler investment to operate
A Fourplex May Be Better If:
- You want to maximize rental income
- You are focused on scaling your portfolio
- You have sufficient capital and reserves
- You are comfortable managing more tenants
- You want more income diversification
Do Not Choose Based on Unit Count Alone
One of the biggest mistakes investors make is assuming that a fourplex is automatically better because it has one additional unit.
The quality of the investment depends on the entire acquisition.
Before buying, analyze:
- Purchase price
- Current rental income
- Potential rental income
- Operating expenses
- Financing
- Required renovations
- Building condition
- Neighbourhood
- Long-term appreciation potential
A strong triplex can outperform a weak fourplex.
Why Work With Plex Guru?
Choosing between a triplex and a fourplex requires more than comparing asking prices.
You need to understand how each property fits into your broader acquisition strategy.
Plex Guru helps Montreal real estate investors evaluate plex opportunities based on the factors that matter most:
- Rental income
- Cash flow
- Financing
- Property condition
- Renovation potential
- Neighbourhood fundamentals
- Long-term portfolio strategy
The goal is not simply to buy more units. It is to acquire the right property at the right price for your investment objectives.
Final Thoughts
Both triplexes and fourplexes can be excellent additions to a Montreal real estate portfolio.
A triplex may provide a more accessible and manageable entry into multi-unit investing, while a fourplex can offer greater income potential and faster portfolio growth.
The right answer depends on your budget, financing capacity, management experience, and long-term investment strategy.
Before making an offer, compare the numbers carefully and evaluate the property as a complete investment rather than simply counting the number of units.
Which Plex Is Right for Your Portfolio?
If you are comparing triplexes, fourplexes, or larger multiplex opportunities in Montreal, Plex Guru can help you evaluate the numbers and build a clearer acquisition strategy.
Get a strategic session to build your Montreal acquisition growth plan.