Underwriting
May 21, 2025
What is Underwriting?
Underwriting is the process lenders use to assess a borrower’s risk and determine whether to approve a mortgage application.
Why Underwriting Matters in Real Estate
In Canadian real estate, underwriting plays a critical role in securing mortgage financing. Lenders review credit history, income, assets, employment, and the property itself before making a loan decision.
Steps in underwriting may include:- Verifying income and employment
- Reviewing credit score and history
- Assessing debt service ratios
- Appraising the property’s value and condition
Automated underwriting systems may issue quick decisions, while complex applications (e.g. self-employed borrowers) are reviewed manually.
Understanding underwriting helps buyers prepare accurate documents, reduce delays, and improve approval odds.
Example of Underwriting in Action
The lender’s underwriter reviews the buyer’s income, credit, and appraisal to approve the mortgage before closing day.
Key Takeaways
- Evaluates borrower and property risk.
- Required for mortgage approval.
- May be automated or manual.
- Relies on complete documentation.
- Crucial step in the financing process.
Related Terms
- Mortgage Qualification
- Credit Score
- Debt Service Ratios
- Appraisal
- Lender Guidelines

Canada residential unit sales by month, actual, 2019 and 2024-2026. Data through June 2026. Source:
Canada residential sales-to-new-listings ratio, actual, January 2025 to June 2026. Source:
Canada residential months of inventory, actual, January 2025 to June 2026. Source: Source:
Year-over-year change in residential average sale price for Canada, Ontario, British Columbia and Alberta, January 2022 to June 2026. Average price is shown here as a regional mix measure, not a substitute for HPI or local comparable sales. Source:
Year-over-year change in residential unit sales for Canada, Ontario, British Columbia and Alberta, January 2024 to June 2026. Source: 







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