Journal
Multiplex vs Laneway Home vs Legal Suite: Three Ways to Add Homes on One Vancouver Lot
Frequently asked questions
What is the difference between a multiplex, a laneway home and a legal suite?
A multiplex replaces or adds to the main house with 3 to 8 dwelling units on one lot under Vancouver's R1-1 zoning. A laneway home is one small, standalone house built at the back of the same lot, usually facing the lane. A legal suite is a self-contained unit built inside the existing house, such as a basement suite, registered with the city as its own dwelling. All three add homes to a lot the owner already has, but they differ in how many units they add and whether the existing house stays standing.
Can I build a laneway home and a legal suite on the same lot?
Yes. Costar's project at 2762 West 10th Avenue in Kitsilano, Vancouver, included both a custom legal suite and a laneway home on the same lot, each taken through permit application and new-build construction as separate projects. This combination adds two extra dwellings to a lot without replacing the main house, unlike a multiplex.
Does a multiplex mean tearing down the existing house?
Usually, yes. A multiplex under Vancouver's R1-1 zoning is a small-scale townhouse-style project built to hold 3 to 8 units on a single lot, which typically replaces the existing single-detached house rather than adding alongside it. A laneway home or legal suite instead adds a unit while the main house stays, which is the core trade-off between the two paths.
Which adds the most homes to one lot: a multiplex, a laneway home or a legal suite?
A multiplex adds the most, with 3 to 8 units replacing the single house that was there before. A laneway home and a legal suite each add exactly one dwelling apiece, for a maximum of two additional homes if an owner builds both while keeping the main house standing.
Do laneway homes and legal suites need a building permit in Vancouver?
Yes. Both project types need permit approval before construction starts, the same as a multiplex. Costar folds permit application into the same project timeline as design and construction for laneway homes and legal suites in Vancouver, Burnaby and New Westminster, rather than leaving permitting as a separate task for the client.
Is a laneway home or legal suite less expensive than a multiplex?
A laneway home or legal suite is a smaller project than a multiplex by scope, since each adds one unit rather than replacing the house with 3 to 8 units. The total project cost scales with how much floor area is being built, so a single laneway home or suite carries a smaller total budget than a full multiplex on the same lot.
Where does Costar build laneway homes and legal suites versus multiplexes?
Costar builds laneway homes and legal suites in Vancouver, Burnaby and New Westminster. Costar's completed multiplex projects are in Vancouver, within the company's broader Metro Vancouver service area of Vancouver, Richmond, Burnaby, Coquitlam, New Westminster, North Vancouver, West Vancouver and Port Moody. Ask a Costar consultant which service fits your lot.
How do I decide between a multiplex and keeping the existing house with an added suite?
The lot's zoning eligibility and the owner's goal for the existing house both factor in. A multiplex fits an owner who wants the most units the lot allows and does not need to keep the current house. A laneway home or legal suite fits an owner who wants to add rental income or space for family while keeping the house they already have. A feasibility review of the specific lot, covered under Costar's [multiplex zoning and permits guide](/resources/journal/multiplex-zoning-and-permits-in-vancouver), confirms which unit counts the property actually supports.
Has Costar built all three project types?
Yes. Costar's project gallery includes multiplex builds such as a 5-plex on East 40th Avenue and a 6-plex in Killarney, a duplex at 2145 West 32nd Avenue in Arbutus Quilchena, and the combined laneway home and legal suite project at 2762 West 10th Avenue in Kitsilano.
Sources
- Build a multiplex City of Vancouver, September 25, 2026
- R1-1 District Schedule City of Vancouver, September 25, 2026
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