Construction mortgages in Canada: how draw financing works
Building a home is financed differently from buying one. Instead of a single lump sum at closing, a construction (draw) mortgage releases money in stages as the build progresses — with an inspection before each advance. This guide walks through the typical draw stages, why you pay interest only while you build, the lien holdback your province requires, and how going it alone as a self-builder changes the picture.
The short answer
- What it isFinancing to build, not buy a finished home
- How it paysIn stages ("draws") as the build progresses
- While buildingInterest only on the amount drawn so far
- The holdback~10% held back for the lien period (varies by province)
What a construction mortgage actually is
A construction mortgage funds the building of a home in stages rather than handing over one lump sum at closing.A construction mortgage — also called a draw or progress-advance mortgage — is financing to build a home rather than buy a finished one. With an ordinary purchase, the lender advances the whole amount in a single lump sum on closing day. A build does not work that way: there is no finished house to lend against yet, so the lender releases the money in stages, called "draws," as the construction physically progresses.
Before each advance, the lender typically arranges an inspection or appraisal to confirm that the work for that stage has actually been completed. Only once that is verified does the next slice of money flow. The practical effect is that you never have the full loan in hand at once — you receive it piece by piece, matched to the work that has been done. The number of draws, the timing, and the conditions attached all vary by lender and by province, so treat any specific schedule as a typical example rather than a fixed rule.
The typical draw stages
A typical build uses three or four draws — foundation, lock-up, interior, and completion — with an inspection before each one.Lenders structure draws around construction milestones, with money released only after each stage is confirmed complete. The exact breakdown varies by lender — many use three or four draws — but a typical example looks like this:
Each draw is released only after the lender confirms that stage is done, which is why the inspection matters. You do not get the full amount up front — the money tracks the build. Some lenders split this into three draws, others into four or more, so confirm the precise schedule and the percentage released at each stage with your lender.
Interest-only while you build, then a normal mortgage
During the build you pay interest only on the amount drawn so far; at completion the loan converts to full principal-and-interest payments.While construction is underway, you generally pay interest only, and only on the portion of the loan that has actually been drawn so far — not on the full approved amount. So after the first draw your interest cost is small, and it grows with each subsequent advance as more of the loan goes out the door. This keeps your carrying costs lower during the build, which matters because you are often still paying for your current housing at the same time.
Once the home is complete, the loan converts to a normal mortgage — sometimes called the "take-out" or completion — and you switch to full principal-and-interest payments, just like any homeowner. The interest-only phase is temporary; it exists only to bridge the building period. How and exactly when that conversion happens is set by the lender, so confirm the mechanics before you sign.
Two common structures: progress-draw vs completion
A progress-draw mortgage advances funds in stages as you build; a completion mortgage advances the full amount only at substantial completion.Not every build is financed the same way. There are two common structures, and the difference comes down to when the lender hands over the money:
| Money released | In draws, as you build |
| You pay during build | Interest on amount drawn |
| Who funds the work | The loan, stage by stage |
| Money released | At substantial completion |
| You pay during build | Nothing on this loan yet |
| Who funds the work | The builder, until done |
With a progress-draw mortgage the lender advances funds in stages as described above, so cash arrives to pay for the work as it happens. With a completion mortgage the lender advances the full amount only at substantial completion — which means the builder has to fund the construction out of their own pocket until then. That makes completion mortgages common when you are buying a finished or nearly finished home from a builder, where the builder, not you, carries the build cost. Which one applies depends on the lender and your situation.
The holdback: lien protection built into the loan
Provincial lien law requires a portion of funds — commonly around 10% — to be held back after substantial completion to protect against unpaid contractors.There is one more piece that surprises first-time builders: the holdback. Provincial construction or builder's lien legislation requires that a portion of the funds — commonly around 10% — be held back for a set period after substantial completion. The reason is protection: if a contractor or subcontractor goes unpaid, they can place a lien on the property, and the holdback is the cushion that guards against that.
The lender or the owner retains the holdback and only releases it once the lien period passes without a claim being registered. The exact percentage, the length of the holdback period, and how it is administered are set by the lien law in your province, so the "around 10%" figure is a typical starting point rather than a universal rule. Build the holdback into your cash-flow plan — it means a slice of the money is not available to you right at the finish line.
What lenders want to see
Lenders typically want a larger down payment, detailed plans, a fixed-price contract, permits, a realistic budget, and an as-complete appraisal.Because a construction loan is riskier than lending against a finished house, lenders ask for more. Expect them to look for some combination of the following — the specifics, again, vary by lender:
- A larger down payment than for a finished home.
- Detailed plans and a fixed-price building contract.
- Permits and a realistic, complete budget for the project.
- An appraisal based on the "as-complete" value — what the finished home will be worth.
Approval often hinges on confidence that the project will finish on budget and on time. High-ratio borrowers should also note that CMHC or other default insurance can apply to new builds, with conditions of its own. If you want to understand how lenders judge affordability and the income tests behind a build, see the mortgage affordability calculator and the mortgage stress test.
Self-build vs hiring a builder
Acting as your own general contractor is harder to finance — lenders prefer an experienced licensed builder and scrutinize draws more closely.Acting as your own general contractor — a "self-build" — is harder to finance. Many lenders would rather see an experienced, licensed builder behind the project, and when you are the builder they tend to scrutinize the draws more closely before releasing funds. Some lenders will simply decline to finance an owner-built project, or will attach tighter conditions if they do.
There is a risk dimension too. Self-building carries a greater chance of cost overruns and delays, because you are coordinating trades, materials and schedules yourself rather than handing that off to a professional. Those are exactly the outcomes lenders worry about, which is part of why the financing is harder. If self-building appeals to you, talk to lenders early — including those who specialize in less conventional borrowers, like the best lenders for the self-employed — to find out who will actually back the project.
Risks and challenges to plan for
Watch for cost overruns, carrying two housing costs, rate changes before completion, and timing gaps between contractor payments and lender draws.A build is rewarding, but it comes with challenges that a straightforward purchase does not. Going in with eyes open is the best defence:
- Cost overruns and delays. Builds rarely go exactly to plan; a contingency cushion matters.
- Carrying two housing costs. You may be paying rent or your current mortgage while you build.
- Interest-rate changes. Rates can move between approval and completion, changing what you'll pay once the loan converts.
- Timing mismatches. Contractor payment schedules don't always line up with lender draw inspections — you may need cash on hand to bridge a draw.
That last point trips up a lot of first-time builders: a trade may need paying before the lender's inspector has signed off the stage that releases the matching draw, leaving you to bridge the gap. For the broader picture on rates and finding the right lender for a build, see the best mortgage rates and the best lenders for first-time buyers.
Planning a build?
Pin down what you can borrow, how the stress test applies, and which lenders fit before you break ground.
Frequently asked questions
Common questions on how draw financing works, the stages, interest-only payments, the holdback, self-builds, and progress-draw vs completion.How does a construction mortgage work in Canada?
A construction mortgage (also called a draw or progress-advance mortgage) finances the building of a home rather than the purchase of a finished one. Instead of releasing one lump sum at closing, the lender advances the money in stages — called "draws" — as the build progresses. Before each advance, the lender typically orders an inspection or appraisal to confirm the work for that stage is actually complete. While you are building, you generally pay interest only on the portion drawn so far; once the home is finished the loan converts to a normal mortgage with full principal-and-interest payments. The exact number of draws and the rules around them vary by lender and by province.
What are draw stages?
Draw stages are the construction milestones at which your lender releases a portion of the loan. A typical example uses three or four draws, though this varies by lender: a foundation or excavation draw once the footings and foundation are complete; a lock-up draw once the roof, exterior walls, windows and doors are in and the building is weather-tight; a drywall or interior-finishing draw; and a final completion or occupancy draw when the home is ready to live in. You do not receive the full amount up front — each draw is released only after the lender confirms that stage is done. Because schedules differ between lenders, confirm the exact stages and percentages before you commit.
Do I pay the full mortgage during construction?
No. During the build you typically pay interest only, and only on the portion of the loan that has actually been advanced so far — not the full approved amount. As each draw is released, the interest portion you owe grows, because more of the loan is now outstanding. Once construction is complete the loan converts to a standard mortgage, sometimes called the "take-out" or completion, and you begin making full principal-and-interest payments. This interest-only structure keeps carrying costs lower while you build, but remember you may still be paying for your current housing at the same time.
What is a construction holdback?
A holdback is a portion of the construction funds — commonly around 10%, though the exact figure and timing vary by province — that is held back for a set period after substantial completion. It exists because provincial construction or builder's lien legislation lets unpaid contractors and subcontractors place a lien on the property. The holdback protects against that: the lender or owner retains the funds and releases them only once the lien period has passed without claims. The specific percentage, the length of the holdback period, and how it is administered all depend on the lien law in your province, so confirm the rules locally.
Is it harder to finance a self-build?
Yes, generally. Acting as your own general contractor — a "self-build" — is harder to finance because many lenders prefer to see an experienced, licensed builder and a fixed-price contract behind the project. When you are the builder, lenders often scrutinize the draws more closely and may be more cautious about approving the loan at all. Self-building also carries more risk of cost overruns and delays, which are exactly the things that worry a lender. If you plan to self-build, expect tighter conditions and confirm with lenders early whether they will finance the project on those terms.
What's the difference between a progress-draw and a completion mortgage?
They differ in when the lender releases the money. A progress-draw mortgage advances funds in stages as the build reaches each milestone, so you receive cash along the way to pay for the work as it happens. A completion mortgage advances the full amount only at substantial completion — meaning the builder has to fund the construction themselves until then. Completion mortgages are common when you are buying a finished or nearly finished home from a builder, where the builder carries the build cost. Which structure applies depends on the lender and on whether you are building yourself or buying from a builder.
General information, not lending advice. This guide describes how construction mortgages typically work in Canada, but the details that matter most — the number and timing of draws, the holdback percentage, and the lien rules — vary by lender and by province. Confirm the specifics with your lender and a qualified professional before you commit. Compare your options with the best mortgage rates and run the numbers in the mortgage affordability calculator.