Home types for families: a suite, a laneway home, a duplex or a multiplex

Four ways to house more than one generation on one lot

A secondary suite is a complete small home inside a house, with its own kitchen, bathroom and sleeping space. In Metro Vancouver it is often a basement suite, but it can sit on any floor. A garden suite or laneway home is a small separate building in the back yard, usually at the lane. A duplex is two main homes in one building, side by side or one above the other. A multiplex has three or more main homes. Vancouver's Shape Your City page defines a multiplex as a form of missing middle housing with 3 to 8 dwelling units in one or more buildings on one site, and says each unit has its own direct exterior entrance.

Zoning decides how many homes a lot can hold, and the multiplex zoning guide covers it lot by lot. In short, the province's small-scale housing page (last updated 20 January 2026) says 3 homes must be allowed on lots of 280 square metres or less and 4 on larger lots in the areas the law covers, with 6 allowed near frequent bus service on lots over 280 square metres in places of at least 5,000 people. Each city's bylaw then sets height, setbacks and lot coverage, and those rules decide what fits on a real lot.

The cities name the same forms in different ways. Surrey's page lists a duplex, a houseplex (a triplex or fourplex), a secondary suite, a garden suite on the ground and a coach house above or attached to a garage. Its example of 3 homes is a house with one secondary suite plus a coach house or garden suite. Surrey's amendments took effect on 8 July 2024, and council approved a full review of the rules on 27 July 2026, so check the current bylaw before design starts.

Burnaby's R1 summary (July 2026) lists a single-family home with a secondary suite and a laneway home, two duplex halves with suites, a multiplex of 3 to 6 homes in one building, rowhouses, and cottage courts with several small detached homes on one lot. Burnaby's December 2025 changes reduced building heights and lot coverage, and its new Zoning Bylaw 2026 carries the R1 district forward. In Vancouver, the R1-1 zone replaced the old RS zones, and city staff are reviewing the multiplex rules, with public engagement from fall 2026 into early 2027 and a report to Council expected in early 2027.

Privacy and shared space in each option

A house with a suite is the closest arrangement. The two homes share one structure and often share a yard, a driveway and sometimes a laundry room. For a family that wants to see each other every day, that closeness helps. For a family that needs quiet between a baby and a grandparent who sleeps early, it starts from the lowest sound standard in the code.

That standard is a number. Sound transmission class, or STC, is a rating for how well a wall or floor blocks sound, and a higher number blocks more. Apparent sound transmission class, or ASTC, rates the wall or floor together with the parts of the building joined to it. Article 9.11.1.1 of the BC Building Code asks for STC 43 or ASTC 40 between the homes in a house with a secondary suite. Between the homes of a duplex or multiplex it asks for STC 50 or ASTC 47. The design chapter explains how families can build above either minimum.

A garden suite or laneway home gives the most separation on a standard lot. The older or younger household has its own walls, its own roof and its own door, with the yard between the two homes. No floor or wall is shared, so no sound rating between homes applies. For a parent who wants a home on one level, a small laneway home can be designed with a level entry and no stairs inside, while a basement suite is usually reached by stairs.

A duplex or multiplex gives each household a full-size main home. In a side-by-side duplex the homes share one wall. In a stacked layout they share a floor and ceiling, and footstep noise becomes the main question. A multiplex lets a family give one home to each household and, if the family wants, keep one or two homes as rentals that help pay the mortgage. The ownership question then gets larger, which is why the family ownership chapter exists.

Title: which homes can be owned separately

A secondary suite stays with its house. The BC Building Code defines a secondary suite as a self-contained home in a building that contains only one other home, where both form a single real estate entity. The Homeowner Protection Act Regulation uses a similar definition: a suite in a home that remains a single legal title. Burnaby's R1 summary says it directly: suites must remain registered under the same title as the main home and cannot be stratified. A parent who lives in a basement suite therefore cannot own that suite on its own.

The homes in a duplex or multiplex can be split. A strata plan deposited under the Strata Property Act creates a separate title for each strata lot (section 249). Burnaby's summary lists the ability to stratify main homes, and adds rowhouses where each home sits on its own small lot as another way to give each home its own title. The strata ownership chapter explains the full process, and the timing rule that matters most for families sits in the family ownership chapter here: a building people have already lived in needs council approval to become strata.

A laneway home sits between the two cases. Burnaby says buildings commonly called laneway homes are regulated the same as other single-family dwellings, which Burnaby calls principal buildings. Whether a laneway home on your lot can become a separate strata lot depends on the city and the lot, so ask the city before the design assumes it.

How each option affects the home owner grant and financing

The BC home owner grant lowers the property tax on a principal residence, but it shrinks and then stops on high-value properties. The 2026 threshold is $2,075,000 of assessed value (as of the page updated 22 September 2026). The province allows a partitioned value in that case: the assessed value divided by the number of residences on the property. Each residence must have cooking, sleeping, bathroom and living room facilities. The page names laneway homes, duplexes, triplexes and fourplexes as separate residences, and says a suite in your principal residence does not qualify as a separate residence.

So the building choice changes the tax result. On a lot above the threshold, a house with a laneway home can split the value in two for the grant, and a house with a basement suite cannot. The money and tax chapter covers grant amounts and the other programs.

Financing also follows the building type. CMHC's refinance factsheet (2025) describes insured refinancing for homeowners who add a secondary suite, an in-law apartment or a laneway home to an existing home. It allows up to 4 units including the existing home, up to 90% of the property value, a lending value below $2,000,000 and an amortization of up to 30 years (as of the factsheet read 24 October 2026). The suite must not be rented for less than 90 days at a time. A new duplex or multiplex built after removing the house is financed as construction, which our mortgage post covers.