Construction Mortgage vs. Completion Mortgage: Which Should You Choose for a Custom Build?

Published May 12, 2026

Building a custom home requires either a construction mortgage that funds in draws or a completion mortgage that funds only when the home is done — each carries unique risks. Understanding the differences between these two types of custom home mortgages can help you make an informed decision and avoid potential pitfalls.

Understanding Construction Mortgages in Canada

A construction mortgage, also known as a draw mortgage, is designed to fund the building process of a new home. Unlike traditional mortgages, construction mortgages are paid out in stages, or "draws," based on the progress of the build.

The lender releases funds to the builder at predetermined intervals, typically after each phase of construction is completed and inspected. This ensures that the money is used appropriately for the building process.

How Draw Mortgages Work

Here's a breakdown of how draw mortgages work:

  1. The lender approves the mortgage based on the appraised value of the completed home and the builder's reputation.
  2. The borrower pays interest only on the amount drawn during construction.
  3. The lender releases funds in stages, usually after inspections confirm that each phase is complete. This process involves draws and specific closing risks.
  4. Once construction is finished, the mortgage converts to a traditional mortgage with principal and interest payments.

Completion Mortgages Explained

A completion mortgage differs from a construction mortgage in that funds are not released until the home is fully completed. This type of mortgage is often used when the builder provides financing for the construction process.

Builder Financing Canada: How It Works

In many cases, builders offer their own financing options to cover the construction costs. Here’s how it typically works:

  • The builder finances the construction using their own funds or through a line of credit.
  • Once the home is completed, the buyer obtains a traditional mortgage to pay off the builder's financing.

Construction Mortgage vs. Completion Mortgage: Pros and Cons

FeatureConstruction MortgageCompletion Mortgage
FundingReleased in stages during constructionReleased only upon completion
Interest PaymentsInterest-only payments during construction, then principal and interestNo interest payments until completion
RiskHigher risk due to potential delays or cost overrunsLower risk as funds are only released upon completion
FlexibilityMore flexible with funding stagesLess flexible, as funds are not available until the end

Choosing the Right Mortgage for Your Custom Build

When deciding between a construction mortgage and a completion mortgage, consider the following factors:

  • The builder's reputation and financial stability.
  • Your budget and financial situation.
  • The complexity of your custom build project.
  • The potential for cost overruns or delays.

Tip: Always get multiple quotes from different lenders to ensure you're getting the best rates and terms. Consider working with a mortgage broker who specializes in custom home mortgages to navigate the complexities of construction financing.

Key Considerations for Custom Builds

Building a custom home involves numerous considerations beyond just the mortgage type. Here are some key points to keep in mind:

  • Budgeting: Ensure you have a detailed budget that accounts for all potential costs, including unexpected expenses.
  • Timelines: Work with your builder to establish realistic timelines and milestones for the construction process.
  • Insurance: Obtain appropriate insurance coverage to protect against damages or losses during construction.

Bottom Line: Making an Informed Decision

Choosing between a construction mortgage and a completion mortgage depends on your specific needs, financial situation, and the details of your custom build project. Here are some key takeaways:

  • Construction Mortgages: Ideal for those who want more control over the funding process and can manage the risks associated with construction delays or cost overruns.
  • Completion Mortgages: Suitable for buyers who prefer a simpler financing process and are comfortable relying on the builder's financing until completion.

Regardless of which mortgage type you choose, it’s crucial to work with reputable lenders and builders. Conduct thorough research, seek professional advice, and ensure that all contracts and agreements are clearly outlined to protect your interests throughout the construction process.

Reviewed for accuracy
Manbir Natt BCFSA Lic. #MB612411
Licensed mortgage broker · MBA, Rotman School of Management, University of Toronto

AI-generated content. This article was produced with AI assistance and reviewed for general accuracy. It is for informational purposes only and does not constitute financial, mortgage, or legal advice. Always consult a licensed mortgage professional before making any financial decisions.

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