From Duplex to Triplex: A Smart Housing Upgrade in Kingscourt–Rideau Heights

In Kingston’s Kingscourt–Rideau Heights neighbourhood, where affordable housing is in short supply, small-scale projects are making a big impact. One property owner recently transformed a dated duplex into a bright, efficient triplex that adds more housing, comfort, and character, without changing the look or feel of the neighbourhood.  

Transforming the Basement Into a Modern Apartment  
The property began as a typical two‑unit house with an unfinished basement. But with a little imagination and thoughtful design, that unused space became a fully functional two‑bedroom apartment. The house already had a rear walkdown that once led to a covered cold room. This was completely reimagined into a private entrance with a small terrace, giving the new lower unit its own sense of independence and outdoor connection.

 

The design focused on young professionals and students seeking practical but comfortable rental options close to downtown. Larger bedrooms make the space ideal for roommates, while the compact living area encourages efficient use of space. A newly enlarged window brings in natural light and meets modern egress requirements, creating a bright, welcoming interior. To maximize functionality, the mechanical room was reduced in size, allowing room for an additional bedroom and its own laundry, a major value add for renters.  

 

Thoughtful Refresh of the Upper Units  
While the basement underwent a major transformation, the two upper units were updated as tenants moved out. The interior stairs to the basement were removed to open more usable space and improve privacy between suites.  

On the main floor, the bathroom was redesigned for comfort and accessibility. In-suite laundry and extra storage were added, small touches that make day-to-day living easier. The second floor became a cozy one-bedroom unit with sloped ceilings, excellent natural light, and its own private entrance, giving it the feel of a self-contained loft.  

 

Each unit now has its own character and appeal, catering to a mix of tenants, from students to working professionals, while improving the overall functionality of the property.  

Gentle Density That Strengthens the Neighbourhood  
This conversion is a perfect example of “gentle density”: adding housing within existing neighbourhoods in a way that enhances the community rather than overdeveloping it. By turning unused basement space into quality housing, the property owner contributed to Kingston’s broader effort to provide more affordable rental options while making better use of existing infrastructure.  

Kingscourt–Rideau Heights continues to evolve, and projects like this show how modest upgrades can create lasting benefits, for homeowners, for tenants, and for the city as a whole.  
If you own a duplex or large single-family home in Kingston and have ever wondered about adding another unit, this project proves it can be done beautifully and responsibly. Reach out to House of Three to explore your property’s potential and become part of the solution to Kingston’s growing housing needs.