Most expensive problems on these projects trace back to a handful of avoidable decisions made early. Here are the ones we see most.
Written by Serge, Founder, Kelowna Carriage Homes
Hiring a designer or a trade before confirming zoning, setbacks, and servicing costs for the specific lot is the most common expensive mistake. Money spent on drawings for a plan that doesn’t fit the site is money spent twice once the real constraints surface.
The distance from a new unit to the water and sewer main line moves a construction budget more than finish choices do. Confirming this distance and the servicing route before setting a fixed budget avoids the most common source of a mid-project cost surprise.
Kelowna generally requires one added parking stall for a carriage house. A design that does not reserve site room for that stall triggers a redesign or a variance application partway through the permit process, adding weeks to the timeline.
Unpermitted work complicates a future sale, can affect an insurance claim, and does not qualify for the CMHC 90% refinance product or most legal-suite financing. There is no version of this project where skipping permits saves money once resale or financing is considered.
Site conditions like bedrock, slope, or an undersized electrical service are common enough that a project without a contingency line item risks a mid-build stall. Budgeting a contingency percentage upfront is cheaper than negotiating a change order mid-construction.
Some existing mortgages carry use restrictions or require lender consent before a rental unit is added to the property. Check this before signing a construction contract, not after the foundation is poured.
BC’s short-term rental rules restrict nightly rentals to a host’s principal residence, plus one secondary suite, in nearly all communities, and Kelowna’s own zoning narrows this further even after its 2026 opt-out. Full detail is on the short-term rental legal status page; the safer default assumption is a long-term tenancy.
Moving fast to fill a vacancy without following BC’s screening rules, covered on the tenant screening page, creates avoidable legal exposure. Forgetting to add a landlord insurance endorsement before move-in, covered on the insurance guide page, leaves a real coverage gap for the first tenancy.
Most of these mistakes are avoidable with a written feasibility study before any money is spent on design.
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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.