Mortgages for Pre-Construction Homes in Canada

A pre-construction mortgage in Canada is the mortgage you arrange to fund a home that does not exist yet. You sign an agreement with a builder, pay a deposit in instalments, and the mortgage money is only advanced months or later at closing, once the home is finished and title transfers to you. That long gap between signing and closing is what makes pre-construction financing different from buying a resale home.

How a pre-construction purchase is structured

When you buy from a builder, you sign an Agreement of Purchase and Sale (APS) rather than an offer on an existing house. Three dates drive everything:

• Deposit schedule — you typically pay your deposit in instalments over the following weeks or months, not in one lump sum. Builders usually hold deposits in trust.
• Occupancy or interim closing — the date the builder lets you move in, before the home is legally registered.
• Final closing and registration — the date title transfers to you and your lender actually advances the mortgage funds.

Your deposit is generally credited toward your down payment at final closing. In provinces that use an interim occupancy period, you move in and pay occupancy charges to the builder instead of mortgage payments until registration. Ask a real estate lawyer how this works where the project is located, because the rules are provincial.

Why lenders treat pre-construction differently

A pre-approval is not a mortgage. It is an estimate of what you could borrow, and it usually comes with a rate hold that expires in a matter of months — far shorter than the time it takes to build a home. Some lenders offer extended rate holds for new builds, but those often carry a premium or a fee, and the terms vary widely. Ask what happens to your rate if closing is delayed by the builder.

There is also nothing meaningful to appraise at the start. Your lender appraises the completed home near closing and bases the mortgage on the lower of the purchase price or the appraised value. If the market shifts between signing and closing, you still owe the builder the full purchase price, so the loan-to-value math can change and you may need more cash down.

Finally, your finances at closing matter more than your finances when you signed. Pay down existing debts, avoid new car loans or credit cards, and keep your income documents current.

Qualifying: the stress test, GDS and TDS

Federally regulated lenders apply OSFI Guideline B-20. Under the mortgage stress test, you must qualify at the higher of your contract rate plus two percentage points or the published qualifying-rate floor. Confirm the current floor with OSFI or your lender, since it can change. Read the Canadian mortgage stress test, explained for the full mechanics.

Lenders then compare your income against your housing costs using the Gross Debt Service (GDS) and Total Debt Service (TDS) ratios. For insured mortgages, the conventional ceilings are typically 39% GDS and 44% TDS, though individual lenders can be stricter. See how lenders use GDS and TDS ratios.

Down payment and first-time buyer programs

Your deposit and your down payment are usually the same money, delivered in stages. How much you need depends on the purchase price — see minimum down payment rules in Canada. Put down less than 20% and the mortgage must be insured, usually through CMHC mortgage default insurance.

If this is your first home, three federal options are worth checking:

• The RRSP Home Buyers' Plan lets you withdraw from your RRSP to buy or build a qualifying home, subject to CRA rules and a repayment schedule.
• The First Home Savings Account (FHSA) pairs a tax deduction with tax-free growth when the funds go toward a qualifying first home.
• Federal first-time buyer programs, including shared-equity support, come with eligibility rules and limited funding. Confirm current availability before you count on any of them.

Check the withdrawal timelines carefully. Program rules require the funds to be used for a qualifying home within set periods, and a delayed closing can complicate that.

Costs the sticker price does not show

New builds carry costs a resale purchase may not:

• Land transfer tax or its provincial equivalent, calculated on the purchase price. Rebates for first-time buyers and new construction differ by province and municipality.
• GST/HST — new housing is taxable. Builders frequently quote a price with the tax included and the rebate assigned to them, so confirm exactly how your agreement handles it with your lawyer or accountant.
• Development charges and levies — usually built into the price, but read the fine print on what the builder has capped.
• Interim occupancy charges — paid to the builder before final closing in provinces that use them.
• Closing adjustments — property tax and utility adjustments, plus utility hookups, appliances, window coverings, and landscaping.
• Mortgage default insurance premium — added to your mortgage balance when your down payment is under 20%.
• Upgrades — anything above the builder's standard finishes, usually paid up front.

Budget for these alongside your down payment. Our guide to closing costs when buying a house in Canada walks through the list.

Protect yourself before you sign

• Have a real estate lawyer review the APS before you sign, not after.
• Confirm whether your deposit is held in trust and what happens to it if the project stalls or is cancelled.
• Ask about the provincial new home warranty program and what it actually covers.
• Understand assignment clauses and any builder right to extend the closing date — builders often control the timeline, not you.
• Keep a cash cushion. Rates, appraised values, and closing dates can all move against you.
• Re-qualify with your lender well before closing instead of assuming your original pre-approval still holds.

Pre-construction can be a practical way into the market, especially when you need time to save. Treat it as a long financing project rather than a single transaction, and keep your lender and lawyer in the loop at every stage.