New Construction Mortgages: Draw vs. Completion Mortgages — What You Need to Know

Buying a newly built home can be exciting—but financing a new construction property is very different from financing an existing home.

One of the biggest differences is how and when the mortgage funds are advanced. Depending on the lender and the construction arrangement, you may be dealing with either a draw mortgage or a completion mortgage.

Understanding the difference before signing your purchase or construction agreement can help prevent unexpected financing requirements, interest costs and cash-flow problems.

What Is a Draw Mortgage?

A draw mortgage—sometimes called a progress-draw mortgage—is funded in stages as construction progresses.

Instead of the entire mortgage being advanced when the home is finished, the lender releases portions of the mortgage at predetermined construction milestones or stages.

A typical construction schedule might look something like:

• First draw: Foundation or excavation

• Second draw: Framing

• Third draw: Mechanical systems and insulation

• Fourth draw: Drywall and interior completion

• Final draw: Substantial completion

The exact number and timing of draws varies by lender and construction agreement.

Why Use a Draw Mortgage?

The basic idea is simple: the lender advances money as the property is being built.

This provides several benefits:

For the borrower: You may only pay interest on the funds that have actually been advanced rather than on the entire mortgage from day one.

For the lender: The lender can monitor construction progress and the property's increasing value before advancing additional funds.

For the builder: It provides access to financing throughout the construction process rather than requiring the builder or homeowner to finance the entire project upfront.

However, draw mortgages can be considerably more complicated from a cash-flow and qualification perspective.

What Is a Completion Mortgage?

A completion mortgage works very differently.

With a completion mortgage, the lender generally doesn't advance the mortgage throughout construction. Instead, the mortgage is funded when the home is substantially complete and the purchase closes.

This is common with many new-build purchases from a builder, particularly where the builder is financing construction themselves.

For example:

You purchase a new home from a builder in 2026 for $650,000.

The home takes 18 months to build.

You don't typically receive mortgage advances throughout those 18 months. Instead, your mortgage is funded when the home is completed and you're ready to take possession.

Why Is This Important?

Because your financing may be months—or even years—away from the original purchase date.

That creates a significant planning issue:

What happens if your financial situation changes before closing?

Your income, employment, debts, credit profile, down payment or lending policies could be different when the mortgage is eventually finalized.

Draw vs. Completion: The Key Difference

The easiest way to understand the difference is:

	Draw Mortgage	Completion Mortgage
Mortgage funding	Throughout construction	At completion
Who typically uses it?	Custom builds / owner builds	New homes purchased from builders
Interest	Generally on funds advanced	Begins when mortgage funds
Construction monitoring	Typically required	Usually handled by builder
Cash-flow considerations	Significant	Generally simpler
Financing risk	Ongoing throughout construction	Concentrated near completion
Qualification	Can involve more complexity	Must generally qualify at closing

The important point is that neither structure is automatically better.

The appropriate structure depends on the type of construction, the lender, the borrower and the specific financing arrangement.

What About Interest During Construction?

This is one of the biggest differences between the two structures.

With a draw mortgage, the borrower may begin paying interest as funds are advanced.

For example, imagine a $500,000 construction mortgage:

• $100,000 advanced initially

• $150,000 at the next stage

• $150,000 at the following stage

• $100,000 at completion

You aren't necessarily paying interest on the full $500,000 from the beginning. Instead, interest is generally calculated based on the outstanding amount.

With a completion mortgage, the borrower generally doesn't have mortgage interest payments during construction because the mortgage hasn't been advanced yet.

But that doesn't mean construction is cost-free.

You may still have rent, construction financing, deposits, land financing, builder payments or other carrying costs depending on the situation.

What About the Down Payment?

This is another area where new construction financing can become complicated.

The timing of your deposits and down payment can be very different from a traditional resale transaction.

For example, a builder may require:

$10,000 deposit → $25,000 deposit → $40,000 deposit → balance of down payment at closing

The mortgage is based on the final purchase price and lending structure, but the timing of those deposits matters significantly for your cash flow.

What Happens If the Property Appraises for Less?

This is another potential issue with new construction.

Suppose you sign a contract for:

Purchase price: $700,000

But closer to completion, the property is appraised at:

$650,000

The lender may base its lending decision on the lower value, depending on the circumstances and mortgage structure.

That can create a financing shortfall.

This is particularly important in rapidly changing markets where property values can move significantly between the time you sign the contract and when the home is completed.

Can You Lock in Your Rate?

Potentially—but this is highly lender-specific. Some lenders offer extended rate holds or special new-construction programs designed to accommodate long completion periods. Others may not. And even when a rate hold is available, there can be conditions attached.

This is why it's important to understand the lender's rate-hold policy before assuming today's rate is guaranteed for your eventual closing.

What Can Go Wrong?

Some of the most common problems with new construction financing happen because financing isn't considered early enough.

1. The borrower no longer qualifies

Income, employment or debt changes can affect qualification.

2. Construction takes longer than expected

The original financing timeline may no longer work.

3. The property doesn't appraise as expected

A valuation shortfall can create a significant cash requirement.

4. Construction costs increase

Custom builds can experience cost overruns, potentially requiring additional financing or cash.

5. The borrower runs out of liquidity

Construction has a way of producing unexpected expenses.

6. The mortgage structure doesn't match the project

A financing solution designed for a standard builder purchase may not be appropriate for an owner-built property.

Draw mortgages and completion mortgages solve different problems.

A draw mortgage provides financing throughout the construction process and can make sense for custom or owner-built projects.

A completion mortgage is generally simpler for a purchaser buying a new home from a builder, with the mortgage funded when the home is ready to close.

But the most important consideration isn't simply "Which mortgage has the lowest rate?"

It's: "Which financing structure best fits the construction project, timeline, cash flow and borrower?"

If you're buying a new construction home or building from the ground up, it's worth having your mortgage strategy reviewed before signing the contract—not just before closing.

A little planning at the beginning can prevent some very expensive surprises at the end.