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Across Canada, families are rethinking what the family home needs to do. For many younger adults, buying a home independently has become increasingly difficult as housing prices remain high and mortgage qualification remains challenging.
According to Statistics Canada , 43% of Canadians aged 20 to 29 were living with at least one parent in 2021. For parents who once viewed homeownership as a natural milestone of adulthood, that reality is prompting a different question: could the property they already own help support the next generation?
That is where generational housing — and increasingly multiplex housing — can offer another option.
What Is Generational Housing?
Generational housing refers to living arrangements where multiple generations of the same family share a home or live in separate units on the same property. It can help families share housing costs, stay close to one another, support caregiving, and give younger adults a greater degree of housing stability.
Modern generational housing does not necessarily mean parents, adult children, and grandparents sharing one kitchen and living room. Increasingly, families are creating independent dwelling units that allow relatives to remain close while maintaining privacy and autonomy.
One housing type particularly well suited to this approach is the multiplex .
Why Multiplexes Make Sense for Multi-Generational Living
Multiplexes are low-rise residential buildings containing multiple self-contained homes. Toronto currently permits four-unit multiplexes citywide, subject to applicable zoning and building requirements, while permissions for five- and six-unit buildings vary by location.
For families, the opportunity is bigger than simply adding rental units. A multiplex can allow one property to serve several generations at the same time while retaining the flexibility to change as the family's needs evolve.
Consider a couple in their late 50s living in East York who convert their bungalow into a triplex. They could remain in one unit while their adult child and partner occupy another, giving the younger household an independent home without immediately having to purchase a separate Toronto property. A third unit could be rented, helping offset financing and operating costs.
Years later, the same units could serve completely different purposes. A unit occupied by an adult child today might eventually become housing for an aging parent, another relative, or a long-term tenant.
That adaptability is one of the strongest advantages of generational housing.
How to Convert Your Home into a Multiplex
1. Start with a Property Feasibility Check
Not every property is equally suited to multiplexing. Lot dimensions, the existing structure, zoning standards, trees, servicing, heritage considerations, conservation restrictions, and other site-specific conditions can all influence what is practical.
Tools such as ReHousing.ca can provide an initial reference, but an online tool should not replace a property-specific feasibility assessment before significant money is committed to design or construction.
2. Work with Professionals Who Understand Multiplexes
A multiplex conversion is different from a conventional kitchen renovation or single-family addition. Unit separation, fire and life safety, sound transmission, entrances, utilities, mechanical systems, servicing, tenant functionality, and long-term maintenance all need to work together.
Working with a Design-Build team experienced in multiplex projects can help connect feasibility, design, permitting, and construction rather than treating each stage as an isolated project.
3. Confirm Zoning and Permit Requirements
Toronto's multiplex reforms have significantly expanded where this type of housing can be created. However, permission for a particular number of units does not mean every proposed design automatically complies.
A project must still satisfy applicable zoning standards, the Ontario Building Code, City requirements, permits, and any other laws or site-specific restrictions that apply to the property.
4. Consider Construction Phasing Carefully
Some homeowners consider completing work in stages — for example, creating a secondary unit first and undertaking a larger conversion later. Phasing can help spread costs over time and may be useful when the owner continues living in the property during construction.
However, each phase should still form part of a larger plan. Work completed today should not unnecessarily complicate the layout, mechanical systems, structural work, or approvals required for the next stage.
5. Design for Future Uses, Not Just Today's Family
The household occupying each unit may change over time. A space created for an adult child could later become housing for a parent, a long-term rental, or another family member.
If rental use is likely to become part of the property's future, decisions around entrances, utilities, storage, waste management, sound separation, maintenance access, and multiplex Property Management are easier to consider during design than after the building is complete.
Design for Independence as Well as Proximity
Generational housing tends to work best when family members can remain close without feeling that they have sacrificed their independence. Separate entrances, kitchens, bathrooms, laundry facilities, storage, and thoughtful sound separation can make a substantial difference to how the property functions day to day.
The goal does not have to be recreating one large shared household. In many cases, the better solution is several functional homes within one property.
Generational Housing Can Also Support Aging in Place
The conversation about generational housing often focuses on adult children, but the same flexibility can support parents as they age. A homeowner may eventually prefer a smaller unit on the property while another family member occupies the larger home.
This is also part of the broader discussion around Missing Middle housing : creating more housing choices within established neighbourhoods so people do not necessarily have to leave their communities when their housing needs change.
Conclusion: Generational Housing Is a Long-Term Housing Strategy
Multiplex conversions are often discussed as an investment opportunity, but for families their value can be much broader. They can create another option between financially supporting a separate home purchase and having several generations share a space that was designed for only one household.
A multiplex will not be the right solution for every family or every property. But in a city where land is limited and housing costs remain significant, flexible low-rise housing gives homeowners more ways to use the property they already own.
Generational housing is ultimately less about adding units than creating a home capable of changing with the family that owns it.
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