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When a Private Mortgage Is the Cheapest Option to Build

by | February 13, 2026

When “Expensive” Private Money Is the Only Way to Build—and the Cheapest Way to Finish

Private mortgages don’t get a great reputation—and honestly, that reputation is earned. The rates are higher. The fees are real. Lender fees, broker fees, appraisals, legal costs, interest-only payments, sometimes minimum interest periods. When you add it all up, private construction financing can feel brutally expensive.

But here’s the truth most people miss:

In construction and small-scale development, the most expensive mortgage on paper is often the cheapest way to get the project done.

Because in this world, the real enemy isn’t interest—it’s delay.

Projects don’t fail because money is expensive. They fail because money shows up too late, in the wrong amounts, or not at all.

Let’s Roll Up Our Sleeves:

The True Cost of Private Construction Financing

Self-Builds and Custom Home Construction

Small Developers and Infill Projects

Major Renovations and Secondary Suites

A Real-World Story: High-Cost Money, Low-Cost Outcome

How Realtors and Homeowners Can Use This Strategically

How I Help Clients Use Private Construction Financing Properly

The True Cost of Private Construction Financing

Before we talk strategy, let’s be clear about the costs.

A private construction or development mortgage often includes:

  • Interest rates in the low-to-mid teens
  • Lender fees typically 2–5%
  • Broker fees often 1–3%
  • Appraisal and legal costs higher than standard mortgages
  • Short terms and interest-only payments

That’s not cheap capital. No spin here.

But construction doesn’t live in spreadsheets—it lives in timelines, permits, contracts, and cash flow gaps. And when banks say “no” or “maybe later,” those delays can cost far more than interest ever will.

Self-Builds and Custom Home Construction

If you’ve ever tried to build your own home, you already know this: banks hate construction risk.

Traditional lenders often require:

  • Land owned outright
  • A licensed builder
  • A fixed-price contract
  • Limited draw schedules (often three draws total)

Miss any one of those, and the answer is usually no.

Even when banks say yes, the money comes slowly. Draws are rigid. Cost overruns aren’t tolerated. Owner-builders can get stuck mid-project with contractors waiting and invoices piling up.

Private construction lenders operate differently. They specialize in this messy middle.

They may:

  • Accept land equity as down payment
  • Fund in multiple flexible draws
  • Advance money when you actually need it
  • Focus on the finished value, not just today’s risk

Yes, the rate is higher. Yes, the fees exist. But compare that to:

  • Losing deposits on materials
  • Contractors walking off the job
  • Construction cost inflation while you wait
  • Paying rent or carrying another property longer than planned

Suddenly, private money doesn’t look expensive—it looks decisive.

The private lender carries the risky phase. Once the home is complete and tangible, you refinance into a normal mortgage and move on. The interest paid becomes a finite, controllable cost to make an otherwise impossible build possible.

Small Developers and Infill Projects

For small developers—duplexes, triplexes, laneway homes, small infill projects—financing has become tighter than ever.

Banks increasingly want:

  • Pre-sales
  • Cookie-cutter designs
  • Conservative timelines
  • Zero surprises

That’s a tough fit for real-world development.

Private construction lenders look at different things:

  • The deal itself
  • The location
  • The builder’s experience
  • The exit strategy

And most importantly, they move fast.

In development, delays are poison. Miss a construction season. Lose a contractor. Carry land for an extra year. Watch materials costs climb. Suddenly your profit margin evaporates.

Using private financing to keep a project on schedule often costs far less than:

  • Delaying a year
  • Losing buyers
  • Absorbing rising construction costs
  • Canceling the project entirely

Developers who use private money strategically treat the interest as a business expense, not a moral failure. They build, sell or refinance, exit cleanly, and move on.

The difference between a profitable project and walking away empty-handed is often whether financing showed up on time.

Major Renovations and Secondary Suites

Not all construction is ground-up building.

Sometimes it’s:

  • A gut renovation
  • A basement apartment
  • A garden suite
  • A structural overhaul

Banks may approve a small HELOC—but rarely enough to complete the job properly. Unsecured credit is limited and brutally expensive.

Private lenders will often lend based on future improved value, not current condition. They focus on equity and end value rather than income ratios and pay stubs.

The loan is usually short-term—6 to 12 months during construction. The rate is higher, yes. But once the project is done:

  • The home appraises higher
  • Rental income improves
  • Refinancing becomes easy

Waiting years to save cash or qualify for more bank credit has costs too:

  • Lost rental income
  • Underutilized space
  • Rising construction prices
  • Stagnant property value

Doing the project now, even with expensive money, can be cheaper than doing it later with “cheap” money.

A Real-World Story: High-Cost Money, Low-Cost Outcome

A homeowner wants to add a legal secondary suite. The numbers are strong. The value uplift is clear. The bank says no—income too tight today.

Private financing bridges the gap. The rate stings. The fees are noticeable. But six months later:

  • The suite is finished
  • Rental income is in place
  • The property appraises significantly higher

The refinance wipes out the private loan.

Had they waited years to save cash, the lost rent alone would have exceeded the private interest.

How Realtors and Homeowners Can Use This Strategically

For Realtors

  • Recognize when financing delay kills value
  • Help clients understand total project cost, not just rate
  • Keep development and renovation deals alive

For Homeowners and Builders

  • Ask what waiting actually costs
  • Treat private financing as a bridge, not a lifestyle
  • Focus on exit strategy before signing

Private money is dangerous only when it’s unplanned.

How I Help Clients Use Private Construction Financing Properly

My role isn’t to push private loans—it’s to protect you from misusing them.

That means:

  • Stress-testing the project economics
  • Keeping terms short
  • Controlling fees
  • Planning the refinance or sale before funding
  • Coordinating with builders, appraisers, and lenders

Private construction financing should solve one problem: getting the project done.

Allen’s Final Thoughts

Private mortgages are expensive. They’re meant to be.

But in small-scale development and construction, the real cost isn’t interest—it’s stalling, stopping, or never starting.

Used poorly, private money can wreck a project.
Used intentionally, it can be the cheapest path to completion.

The goal is never to live in private financing.
The goal is to use it briefly, strategically, and exit stronger.

And when you’re trying to decide whether “expensive money” is actually the smartest move—that’s exactly the decision I’m here to help you make.

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Allen Ehlert

Allen Ehlert

Allen Ehlert is a licensed mortgage agent. He has four university degrees, including two Masters degrees, and specializes in real estate finance, development, and investing. Allen Ehlert has decades of independent consulting experience for companies and governments, including the Ontario Real Estate Association, Deloitte, City of Toronto, Enbridge, and the Ministry of Finance.

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