Seven reasons why multiplexes create more affordable homes

This four-plex fits on one single family lot, providing living spaces for more people at lower cost than a single family home. Image: B.C. Standardized Housing Designs Catalogue

In low-density neighbourhoods, multiplexes represent a transformative approach to housing affordability and diversity. They share the high cost of land while offering smaller, more affordable units, increasing overall housing supply. More access to the underlying land benefits a broad range of income levels for both homeownership and rentals. Additionally, multiplexes help reduce upward pressure on housing prices and create varied living options for families, seniors, and younger residents. By shifting the focus from luxury homes, multiplexes foster thriving communities with young and old able to afford to live here. As the Shore embraces them, we can expect a more inclusive and sustainable housing landscape that provides more affordable homes in every neighbourhood.

1. Land Cost Is Shared Across More Homes

On a single-family lot, one household carries the full land cost.
On a 4-plex or 6-plex, that same land cost is divided among multiple units.

  • Example: If a lot costs $1.6M, a single detached house buyer must carry all $1.6M.

  • If six units share that cost, each carries about $266K of land value instead of $1.6M.

This is the single most significant driver of lower per-unit cost.

2. Smaller Units = Lower Total Price

Multiplex homes are typically:

  • Smaller than new detached homes

  • Much cheaper to build (e.g., no basement excavation for a mansion, smaller building envelope)

A new detached house in DNV might sell for $2.5–3.5M.
A multiplex unit is often $800K–$1.2M depending on size—still expensive, but much more attainable than a detached home.

3. More Supply = Less Upward Pressure on Prices

Even modest increases in gentle density:

  • Add “missing middle” homes targeted to households earning normal incomes

  • Reduce competition for older rentals

  • Slow price acceleration at the neighbourhood level

One 6-plex adds five more homes than a single-family replacement. If done repeatedly across neighbourhoods, this meaningfully increases supply.

4. Cheaper to Rent Because Land Cost per Door Is Lower

For renters:

  • A secondary suite or multiplex rental unit priced at $2,000–$2,800/month is significantly cheaper than renting an entire detached home for $5,000–$7,000/month.

  • Purpose-built multiplex rentals can be 20–30% cheaper than units in 6–12-storey concrete apartments due to lower construction costs (wood frame vs. concrete).

5. Multiplexes Unlock New Ownership Forms

Cities are starting to see:

  • Strata-titled multiplex units (e.g., someone buys a 3-bed unit for $900k instead of a $2.5M house)

  • Co-ownership models, where 2–6 households split the mortgage and own separate units

This lets buyers enter the market who otherwise would be permanently priced out.

6. Aging Neighbourhoods Get More Diverse Housing Options

Multiplexes create:

  • Ground-oriented family units (3-bed, 4-bed)

  • Accessible main-floor units for seniors

  • Smaller “starter homes” for younger residents

This supports aging in place, intergenerational living, and a broader mix of incomes.

7. They Prevent Land From Being Used Only for Luxury Homes

Without multiplex zoning:

  • Developers typically tear down an older house and build a large $3–4M detached home.

  • That replacement does nothing for affordability.

With multiplex zoning:

  • The redevelopment instead produces 4–6 more attainable homes, often with at least one rental unit.

Multiplexes are the simplest and most effective way to create attainable ownership and more rental options in low-density neighbourhoods.  Multiplexes make homes more affordable by spreading the land cost across several households, producing smaller, lower-cost units, and adding supply to the ground-oriented part of the housing market.


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