Canada Secondary Suite Loan Program vs. a HELOC: Which Is Cheaper for Building a Basement Apartment?

Let us clear this up first, because the confusion online is genuinely costing people time. The Canada Secondary Suite Loan Program was first announced in the 2024 federal budget and then expanded in late 2024, with headline terms that were easy to fall in love with: loans of up to $80,000, a fixed interest rate of 2 per cent, and a 15-year repayment term, all aimed at helping homeowners add a basement apartment, laneway house, or garden suite.

Then it stalled. Mortgage lenders and insurers never fully embraced the mechanics of advancing construction money, and the program overlapped heavily with new insured-refinance rules that had already taken effect on January 15, 2025. In the end, the government confirmed in its Budget 2025 that the program, which had never actually become operational, will not be implemented. It was not delayed or paused. It was written out.

That is the part so many pages still get wrong. As mortgage commentators like True North Mortgage have pointed out, a great deal of older marketing content continues to present the 2 per cent loan as forthcoming or active, even though the budget documents are clear that it was shelved. If you come across a page promising you can apply for it, treat that as a sign the page simply has not been updated. The good news is that you still have two solid, real ways to finance your suite, and understanding them properly puts you in a much stronger position than the homeowner still waiting for a program that is not coming.

When people ask me what replaced the loan program, this is it. A CMHC insured refinance lets you refinance your existing mortgage, with mortgage-default insurance attached, and use the funds to build a self-contained secondary suite. The reason it matters so much is the borrowing power. According to CMHC's refinance guidelines, you can refinance up to 90 per cent of your home's as-improved value — that is the market value after the suite is finished, not what your home is worth today. For an equity-thin homeowner, borrowing against tomorrow's value is often the difference between affording the project and not.

There are guardrails, and they are worth knowing before you get attached to the idea. Your home's as-improved value has to come in under $2,000,000, which quietly rules out some higher-priced urban properties. You or a close relative must live in one of the units, so this is not a tool for an off-site landlord. The new suite cannot be used as a short-term rental — it must not be rented for periods of less than 90 consecutive days — so if your plan was to list it on a nightly booking site, this route will not fit. And the financing has to be approved before you start construction, because the lender relies on your building plans, permits, contractor quotes, and an as-improved appraisal to decide how much to advance. If you are still mapping out the build itself, our guide on turning your basement into a legal secondary suite walks through the permits and code steps in detail.

The trade-off that surprises people is the insurance premium. Because this is insured financing, a one-time premium applies, and it is calculated on your loan-to-value ratio — roughly 0.6 per cent at the low end and up to about 3.1 per cent for the highest-ratio loans. You can usually add that premium to the loan rather than paying it upfront, which softens the sting, but it is a real cost that a HELOC simply does not carry. In exchange, insured mortgage rates tend to sit meaningfully below HELOC rates, and you get the predictability of a fixed payment and a long amortization of up to 30 years.

There are also underwriting standards you will need to clear. At least one borrower generally needs a credit score of 600 or higher, and you have to fit within the standard debt-service limits, meaning your housing costs and total debts stay within roughly 39 and 44 per cent of your income. You will also be tested against the mortgage stress test, qualifying at the greater of your contract rate plus two percentage points or 5.25 per cent. One helpful wrinkle: the projected fair-market rent from your new suite can often be counted toward your income when the lender runs the numbers, which is exactly the kind of boost that helps a tight application pass.

A home equity line of credit takes a completely different shape. Instead of a lump sum you repay on a fixed schedule, a HELOC is a revolving line secured by your home. You draw what you need, when you need it, and you pay interest only on the balance you have actually used — with minimum payments that can be interest-only. For a basement build that unfolds in stages, that flexibility feels wonderful. You are not paying interest on the drywall budget while you are still pouring the foundation.

The cost of a HELOC rides on your lender's prime rate, which moves with the Bank of Canada. As of July 2026, prime sits at 4.45 per cent, following an overnight rate that the Bank of Canada has held steady at 2.25 per cent through a long run of announcements. Most lenders price a HELOC somewhere around prime plus 0.5 to 1 percentage point, so a well-qualified borrower is realistically looking at something in the neighbourhood of 4.95 to 5.45 per cent. That is higher than a comparable insured mortgage rate, and it is the price you pay for all that flexibility.

Two structural limits shape how much a HELOC can cover. As WOWA's HELOC guide explains, a standalone HELOC is capped at 65 per cent of your home's value, and when you combine it with your mortgage, your total home-secured borrowing cannot exceed 80 per cent. If you have a lot of equity, those ceilings are generous and a HELOC is a comfortable fit. If you are stretched, they can leave you short — which is precisely where the insured refinance, with its 90 per cent of as-improved value, pulls ahead.

The upside worth celebrating is what a HELOC does not have: no mortgage-default-insurance premium, no need to break your existing mortgage, and typically a faster, lighter setup if you already have equity and solid credit. The catch is the flip side of its greatest feature. Because the rate is variable, your payments can rise if prime climbs, and because minimum payments can be interest-only, it is genuinely easy to carry a balance for years without shrinking the principal at all. A HELOC rewards discipline and gently punishes drift.