Will my mortgage still be approved when the home closes years later?

This is the central financial risk of pre-construction, and it is structural rather than unlucky. You are committing to a purchase today and arranging the funding years from now.

What gets re-tested before closing

Roughly three to six months before your closing date, a lender underwrites the deal on the facts as they then stand:

• Your income and employment. A job change, self-employment, parental leave or retirement can all alter what you qualify for.
• Your credit and other debts. A car lease or a new line of credit taken out in year two reduces capacity in year four.
• Rates and the qualifying stress test. Higher rates mean a smaller mortgage for the same income.
• Lender guidelines, which change.
• The appraised value of the home.

The appraisal gap

This is the one that hurts most, because it is outside your control entirely.

Lenders lend against the lesser of purchase price and appraised value. If you agreed to $1,200,000 in 2026 and the home appraises at $1,100,000 at closing, the lender’s 80% is calculated on $1,100,000, $880,000, not $960,000.

That $80,000 difference is yours to fund in cash, at closing, on top of everything else. Your deposit does not stretch to cover it.

In a rising market this never comes up. In a flat or falling one it is common, and buyers who put 10% down are the most exposed: a 10% decline can erase the entire equity position and leave a shortfall.

There is no exit

Worth repeating, because the combination is what causes real damage:

• No cooling-off period on freehold.
• Generally no financing condition.
• Failing to close is a breach, exposing your deposit and potentially more. What happens.

How to protect yourself

Buy below your maximum. The single most effective step. Headroom absorbs rate moves and appraisal gaps.

Model a stressed scenario before signing. Higher rate, flat value, no income growth. If it does not work on those assumptions, it is not a safe purchase.

Keep a cash reserve beyond the deposit specifically for an appraisal gap and closing costs.

Do not add debt during the build. Treat your borrowing capacity as spoken for.

Review with your lender annually. Problems found early have solutions. Problems found at closing have consequences.

Understand your HST position, a failed rebate assignment adds up to $80,000 to closing-day cash.

None of this is a reason to avoid pre-construction. It is a reason to buy with margin, which is a different thing from buying cheap. Let’s stress-test it properly.