The short version: A set of mortgage and housing rule changes now in effect has quietly rewritten the math for Ontario buyers, and many Halton house hunters still have not caught up. First-time buyers can now take 30-year amortizations on insured mortgages for new builds and, under the expanded rules, on homes under $1.5 million. The insured mortgage cap itself rose from $1 million to $1.5 million, which changed the down payment math for a big slice of the Halton market. Add the HST relief window on new builds and Ontario’s move to allow up to three units per residential lot, and the buying landscape in 2026 looks different from what most buyers remember. Here is the plain-English tour.
Change 1: The insured mortgage cap is now $1.5 million
For years, any home priced at $1 million or more required a 20 percent down payment, because mortgage default insurance was only available below that line. That rule shaped the entire GTA market: the $999,999 listing price cluster existed because of it.
The cap for insured mortgages has been raised to $1.5 million. In practical terms, a buyer can now purchase in the $1M to $1.5M range with less than 20 percent down, paying the insurance premium instead. The minimum down payment in that range works on a sliding scale: 5 percent on the first $500,000 and 10 percent on the portion between $500,000 and $1.5 million.
Why this matters in Halton specifically: a large share of Milton and Burlington detached inventory, and much of the Oakville townhouse and semi market, sits in exactly that $1M to $1.5M band. Buyers who assumed they were locked out until they saved $250,000 or more may find the door is open sooner than they thought. The trade-off is the insurance premium and a larger mortgage, so run the full monthly math with your mortgage broker before celebrating.
Change 2: 30-year amortizations for first-time buyers
Insured mortgages were historically capped at 25-year amortizations. First-time buyers can now access 30-year amortizations on insured mortgages, and the allowance extends to new-build purchases as well.
The effect of stretching the same loan over 30 years instead of 25 is a lower monthly payment, which can also improve how much you qualify for under the stress test. The cost is real: more total interest over the life of the mortgage. Think of the 30-year option as a qualification and cash-flow tool, not free money. Many buyers use it to get into the market, then shorten the effective amortization later through prepayments once income grows.
Change 3: The HST relief window on new builds
For agreements of purchase and sale signed within the program window that began April 1, 2026, qualifying buyers of newly built homes can access substantially expanded HST relief, with the largest benefit on new homes priced up to $1 million and meaningful relief up to higher price bands. For Halton buyers looking at Milton’s Boyne and Cobban communities or north Oakville pre-construction, this can change the after-tax cost by tens of thousands of dollars.
Two cautions. First, the program has a defined window and specific eligibility conditions, so confirm current rules with your real estate lawyer before signing anything. Second, do not let a tax rebate talk you into a home that is wrong for you. The rebate improves the math on a good decision; it does not fix a bad one. I covered the rebate program in detail in a separate post linked below.
Change 4: Up to three units per residential lot
Ontario has pushed municipalities to permit up to three residential units per lot as of right in most residential zones. Combined with the garden suite rules under Bill 23, this changes what a Halton detached property can become: a principal residence plus a basement suite plus a garden suite is now a realistic configuration on many lots.
For buyers, this cuts two ways. If you are stretching to afford a detached home, legal secondary-suite potential can offset the mortgage with rental income, and some lenders will count a portion of that projected rent in qualification. If you are buying for quiet single-family living, check what is being built next door, because your neighbour’s lot has the same rights. Either way, verify the specific municipality’s implementation, parking requirements, and permit process before you pay a premium for “suite potential.” Zoning permission and a finished, legal, code-compliant suite are very different things.
What has NOT changed
- The stress test still applies. You still qualify at the higher of your contract rate plus 2 percent or the minimum qualifying rate.
- 20 percent down is still required at $1.5 million and above. The cap moved; it did not disappear.
- Closing costs are unchanged. Land Transfer Tax, legal fees, title insurance, and inspection costs all still apply and still surprise first-time buyers who have not budgeted for them.
- Rates are set by the market, not the rules. The Bank of Canada held its policy rate at 2.25 percent again at its July decision, the sixth consecutive hold, but fixed mortgage rates follow bond yields and move on their own schedule.
What Halton buyers should actually do with this
- Re-run your pre-approval if it predates these changes. A pre-approval built on the old $1M cap and 25-year amortization may understate what you can do today.
- Model both amortizations. Ask your broker for the 25-year and 30-year versions side by side, with total interest over the term, not just the monthly payment.
- If you are considering a new build, get the HST program details in writing from your lawyer before signing at any sales centre.
- If suite income is part of your plan, verify with the specific lender how much projected rent they will count, and verify with the municipality what a legal suite actually requires.
- Do not buy more house just because the rules allow it. Qualification ceilings are not spending recommendations. Leave room to live.
RECO and CREA notes
This article is general real estate education, not mortgage, tax, or legal advice. Mortgage qualification rules, insurance premiums, government program windows, and municipal zoning implementations change over time and vary by situation. Confirm current specifics with a licensed mortgage broker, a real estate lawyer, and the relevant municipality before acting. Program details referenced are current as of publication.
Ashish Gupta is a REALTOR® with CENTURY 21 GREEN REALTY INC., Brokerage. Not intended to solicit clients currently under a representation agreement with another brokerage.
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Related: Ontario HST Rebate on New Builds: read it
Related: Pre-Approval Explained for Halton First-Time Buyers: read it