Both add a legal, self-contained home to your property. The right one depends on your lot, your budget, and what you actually need the space for.
Written by Serge, Founder, Kelowna Carriage Homes
If your budget is under $150,000 and your house has unused interior space (a basement, an unused wing), a secondary suite is usually the faster, cheaper route. If your lot is large enough for a detached structure and you want a fully separate building — for a tenant, for family, or for maximum long-term flexibility — a carriage home is the better fit, at a higher cost. The rest of this page walks through why, category by category.
A secondary suite is a self-contained unit built inside or attached to your existing house — most often a basement, sometimes a garage conversion or an addition. It shares the building envelope with your home but has its own kitchen, bathroom, and entrance, and is legally registered as a separate dwelling unit once permitted.
A carriage home is a fully detached structure on the same lot, typically at the rear facing a lane or reached by a side path. Kelowna caps it at 90 m² (about 970 sq ft), one per lot, not stratifiable. It costs more because you are building an entire structure — foundation, roof, and all — rather than finishing space that already exists. See the complete carriage home guide for the full picture on that option specifically.
A secondary suite conversion generally runs $60,000 to $150,000, depending on the condition of the space you are starting from and whether a separate entrance already exists. A turnkey carriage home runs $350,000 to $550,000, roughly $400 to $550 per square foot for a smaller unit, based on 2025 BC laneway-home cost data. The full cost breakdown itemizes the carriage home figure; the gap between the two options is almost entirely the cost of new foundation, framing, and roof structure that a suite conversion does not need.
A secondary suite conversion is faster because it works within your existing structure: permitting is simpler and construction is typically measured in weeks to a few months rather than a full season. A carriage home takes 3 to 5 months of design and permitting, then 5 to 8 months on site, for a combined 8 to 13 months from start to occupancy. The 6-month construction timeline covers the carriage home build in detail.
A secondary suite depends mainly on your house’s existing layout: ceiling height in a basement suite needs to meet a minimum of 1.95 m (about 6’5”), and you need a separate entrance and, in most cases, a second parking stall. It does not usually require additional site coverage since you are working inside the existing footprint.
A carriage home depends on lot size and site coverage: Kelowna allows about 14% added accessory site coverage, requires its own parking stall (minimum 2.75m × 6.0m), and works best with lane or side-yard access, though neither is strictly mandatory on every lot. The Kelowna zoning laws guide covers both structures under Zoning Bylaw No. 12375 in full. Because a carriage home needs more room, tighter, older lots — common in parts of Downtown Kelowna, for example — often qualify for a suite but not a detached unit.
Secondary suites are often smaller, one-bedroom layouts; CMHC’s 2025 data puts the Kelowna one-bedroom apartment average at $1,596 a month. Carriage homes are more often built as two-bedroom units and generally rent above the two-bedroom average of $2,118, since they are new construction with no shared walls. Central Okanagan vacancy rose to 6.4% in 2025 from 3.8% the year before, which affects both options similarly: a well-built, well-located unit still rents, but expect more time and screening than two years ago. The rental strategy guide covers screening and pricing in the current market.
Both options can be funded through the CMHC-insured refinance program available since January 15, 2025 (up to 90% of home value, $2,000,000 property cap, up to four units, 30-year amortization), or through a HELOC at prime plus roughly 0.5%. Neither option is eligible for the old $40,000 BC grant, which closed to new applicants on March 30, 2025; the grant guide covers what changed. Because a suite costs less, it is more often financed through a HELOC or cash on hand without touching the primary mortgage; a carriage home’s higher cost usually points toward the refinance option instead.
Both add documented, legal rental income to your property, which buyers in this market look for. A carriage home tends to add more resale value in absolute terms because it is a larger, standalone asset, but it also costs more to build, so the return per dollar spent is not automatically higher. A suite is the more efficient dollar-for-dollar improvement on a tight budget; a carriage home is the better long-term asset if your lot and budget support it. Neither complicates a future sale — a legal, permitted unit of either kind is a selling point, not a liability, provided the permits are on file.
Ask yourself three questions. Do you have unused interior space right now (a basement, an unused wing)? If yes, a suite is almost always the faster and cheaper path. Is your lot large enough for a detached structure with its own parking stall and site coverage room? If your lot is tight, a suite may be your only option regardless of preference. Do you want the tenant, or family member, fully separated from your household with no shared walls? If privacy and separation matter most, a carriage home is worth the extra cost.
Most owners do not need to guess: the free feasibility study checks your specific lot against both sets of requirements and tells you which one, or both, will actually work.
Maximizing rental income on a tight budget. If cash flow matters more than square footage, a secondary suite conversion at $60,000 to $150,000 usually reaches a positive return faster, simply because the upfront cost is a fraction of a carriage home’s.
Housing a parent or adult child. Where privacy and separation matter more than cost, a carriage home’s fully detached structure, with no shared walls or floors, tends to work better for daily living than a basement suite below the main living space. The multi-generational housing guide goes through layout choices for this specifically.
Maximizing long-term property value on a larger lot. If your lot easily supports a detached structure and budget is not the limiting factor, a carriage home is the larger, more flexible asset over a 10- to 20-year horizon, and it does not require giving up basement or garage space in your main house.
Day to day, the two options are similar: you, or a property manager you hire, handle tenant screening, rent collection, and maintenance either way. A carriage home has its own roof, siding, and mechanical systems to maintain separately from your house, which is a modest added cost over time. A secondary suite shares systems with your home in some cases (shared roof, sometimes shared heating), which can simplify maintenance but also means suite-related repairs occasionally overlap with work on your own living space.
Neither option changes who is responsible for finding and managing tenants. We build the unit; the ongoing landlord responsibilities are yours, whichever structure you choose.
Most owners who contact us are not sure which option fits until someone looks at the actual lot and house. There is no need to pick a side before reaching out. Send your address through the feasibility study request, and we will tell you, in writing, whether a secondary suite is realistic given your basement or interior layout, whether a carriage home is realistic given your lot size and access, and, if both work, which one better matches the goal you describe: fastest income, lowest cost, or the most separation for a family member.
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Costs, timelines, rents, and incentive amounts on this page are estimates from the sources cited, current as of September 2026. Each is confirmed in writing in your free feasibility study. Licensed and insured; documentation available on request.