The review that happens after the lender already says yes.

The insurer is taking on the default risk if the borrower stops paying, which is a different exposure than the lender's own interest in the loan performing. All applications submitted to the insurer will have already been approved by the lender in accordance with the lender's standard underwriting practice — the insurer then evaluates the file for insurance eligibility against its own usual underwriting guidelines, which is a genuinely separate assessment, not a formality.

This two-layer structure exists because the lender and the insurer aren't assessing the same risk. The lender wants the mortgage to perform for its own book; the insurer is pricing and accepting the risk of default across a large pool of insured mortgages, and needs its own consistent standard applied across every lender submitting to it, not just the standard any one lender happens to apply internally.

It's a structure that mirrors, in a different context, why monoline lenders keep their underwriting closely aligned with insurer requirements in the first place — the insurer sits behind a large share of Canadian mortgage originations, and its standard shapes lender policy well upstream of any individual file reaching its desk for review.

Broadly the same categories the lender already reviewed — income, credit, down payment source, property value — but assessed against the insurer's own eligibility criteria, which can be stricter on certain property types, income structures, or loan-to-value scenarios even where the lender's policy was satisfied.

• →Property eligibility and value, consistent with the insurer's guidelines for the property type
• →Income and debt-ratio confirmation against the insurer's own underwriting criteria
• →Down payment source and, for insured deals, the applicable insured price cap and amortization eligibility (for example, the $1.5 million insured price cap and 30-year amortization eligibility for first-time buyers and new builds effective December 2024)
• →Consistency between the lender's submission and the insurer's own risk parameters

Because Canada has three active mortgage default insurers, a lender may have a choice of which insurer to submit a given file to, and different insurers can have subtly different appetites for certain property types or borrower profiles — another reason a broker shouldn't assume every insured file is being read against an identical standard behind the scenes.

Yes. The insurer can return the file with additional conditions, or in less common cases decline insurance coverage, even after the lender's own approval — which is exactly why an approval isn't the same as a firm commitment on an insured deal. A firm commitment on an insured file generally waits for both the lender's and the insurer's sign-off.

The most common outcome by far is additional conditions rather than an outright decline — a request for a clarifying document, a second look at an appraisal, or confirmation of a detail the lender's own submission didn't fully resolve. An outright insurer decline on a lender-approved file is the less frequent scenario, but it's frequent enough that treating a lender approval as a guarantee of insurer sign-off is a mistake worth avoiding.

When the insurer does add a condition, it typically routes back through the lender rather than directly to the broker — another reason the lender remains the primary point of contact through to firm commitment on an insured file, even though the insurer is the one that ultimately has to sign off.

That routing detail matters for follow-up: a broker chasing an insurer condition should generally go back through the lender contact who submitted the file, rather than attempting to reach the insurer directly, since the lender is the party with the actual relationship and file access at the insurer.

Treat a lender's approval on an insured file as strong, positive news — but not as the signal to tell a client the mortgage is fully locked in. The more accurate message is that the lender is prepared to proceed and the file has moved to the insurer for its own review, with a firm commitment to follow once that clears.

This is a genuinely small percentage of files where it matters in practice — most insured deals move from lender approval to insurer sign-off without incident — but the framing still matters, because the exception is exactly the file a client remembers if it wasn't explained as a possibility from the start.

This is also a reason to build a small buffer into a closing timeline on an insured file rather than assuming the insurer step adds no time at all — see why lender turnaround times differ for how this interacts with turnaround more broadly.

No — insurers retain the ability to request file information after closing, including for regular quality-assurance reviews and, specifically, for file review in the event of early-term default within the first 24 months. That's a practical reason to keep a complete, well-organized file after closing rather than treating documentation discipline as something that ends at funding.

In practice, this rarely surfaces for a well-documented file — it's a background risk rather than a routine occurrence — but it's exactly the kind of thing that only matters on the file where it does come up, which is reason enough to keep the underlying documentation organized and retrievable well past closing.

Brokerages that route insured submissions through Treadstone's fulfillment associates keep the file organized in a way that satisfies both the lender's and the insurer's standards, and that holds up cleanly if the file is ever reviewed after funding.