You've got the lot, the plans, or at least a vision. Now comes the part most people underestimate: securing construction financing before the first shovel hits the ground.

Construction financing is one of the most misunderstood areas of mortgage planning in Ontario. It works differently than a standard purchase mortgage, the qualification process has more moving parts, and the cost of getting it wrong mid-project is significant. This guide walks you through exactly what's involved, step by step, so you go in prepared.

What a Construction Loan Actually Is

A construction loan, sometimes called a draw mortgage, doesn't give you a lump sum at closing. Instead, funds are released in stages called draws, tied to verified construction milestones: foundation complete, framing complete, lock-up, drywall, and so on. Your lender typically requires a third-party inspection before releasing each draw, which keeps the build accountable and protects everyone involved.

Once construction is complete, the loan converts to a standard amortized mortgage. The rate and terms of that conversion are something a lot of borrowers don't think about until it's too late. Getting that locked in from day one is part of doing this right.

The Six Steps to Getting a Construction Loan in Ontario

Here's the honest, sequential process your bank probably won't walk you through proactively.

Step 1: Confirm Your Financial Picture First

Before you talk to contractors, before you finalize plans, you need to know what you qualify for. Your credit profile, income documentation, and existing debt load all shape which lenders will work with you and on what terms.

If your income is unconventional, self-employed, commission-based, or business income, this step matters even more. Banks have rigid qualification criteria that don't always reflect how you actually earn. A mortgage broker with construction lending experience can access lenders a bank branch simply can't offer. If credit is also part of your picture, see my guide to bad credit mortgages in Ontario before any lender conversations start.

Step 2: Have Your Land or Property Secured

Construction financing is secured against real property. If you're purchasing a lot and building simultaneously, that adds complexity. Both transactions need to be structured carefully so your financing lines up. This is not a situation to piece together as you go.

Step 3: Get a Fixed-Price Contract from a Licensed General Contractor

Most institutional lenders won't advance construction funds without a signed, fixed-price contract from a licensed GC that clearly defines the scope and total project cost. This requirement exists for good reason. It forces project discipline and gives the lender confidence that costs won't spiral unchecked.

If a contractor is offering their own financing arrangement as part of the package, understand what that actually is before you sign. Contractor-arranged financing is often unsecured, higher-interest, and rarely designed around a full construction budget. It may have a role in your overall structure, but it's not a substitute for a proper construction mortgage.

Step 4: Submit Your Full Application With Complete Documentation

Construction loan applications require more documentation than a standard mortgage. Expect to provide: income documents (T4s, NOAs, or business financials if self-employed), the signed GC contract, architectural plans and permits, a property appraisal or lot valuation, and your confirmed down payment source.

Getting this documentation organized before you apply, not scrambling for it after, is one of the clearest ways to speed up approval and avoid unnecessary delays.

Step 5: Understand the Draw Schedule and Inspection Process

Once approved, your lender outlines a draw schedule tied to specific build milestones. Each draw typically requires a third-party inspection confirming that work has been completed to standard. Make sure your GC understands this process. An experienced contractor will be familiar with it. One who isn't is a yellow flag.

Step 6: Plan for the Permanent Mortgage Conversion

When construction is complete, your loan converts to a standard mortgage. The rate and terms of that conversion should be discussed and ideally locked in as part of your original construction financing agreement. Don't assume the conversion rate will be favourable because rates look good today. Get it confirmed in writing from the start.

Planning a build in Ontario?

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The Biggest Risk: Starting Before Financing Is Confirmed

The clients who end up in the most difficult situations are the ones who started construction, sometimes well into framing, before their financing was fully confirmed.

Contractors don't pause builds when financing falls through. Material costs don't stop accumulating. An incomplete property is significantly harder to finance, insure, or sell than either a finished home or an unbroken lot.

If your financial situation changes during a build, a job loss, an income disruption, a lender reassessment, the pressure is enormous. My post on losing your job before mortgage completion speaks to exactly how quickly an unconfirmed financing situation can escalate when life intervenes.

Lock in your financing before you break ground. Full stop.

What If the Bank Already Said No?

It happens more than you'd think. Construction lending is a specialized product and many bank branches don't have the appetite or expertise for it, particularly for custom builds, self-employed borrowers, or more complex land situations.

A declined application at your bank doesn't mean there's no financing available. It means that specific lender wasn't the right fit. B-lenders and alternative lenders actively fund construction projects in Ontario, often with more flexibility on income documentation and property type. My guide to private lenders and alternative financing in Ontario walks through the full landscape of options when a bank says no.

Before You Break Ground: A Practical Checklist

Confirm Each of These Before Committing to a Build

  • Financing pre-qualified with a mortgage broker before any contracts are signed
  • Land or property secured with clean title
  • Fixed-price contract signed with a licensed general contractor
  • Architectural plans and permits in order
  • Draw schedule and inspection process understood and communicated to your GC
  • Real estate lawyer engaged, especially if contractor financing is part of the structure. Not sure why legal review matters on financing documents? My post on why a lawyer matters when refinancing in Ontario gives useful context on how mortgage documents carry long-term consequences.
  • Permanent mortgage conversion rate confirmed in writing as part of the construction loan agreement

Frequently Asked Questions

How much down payment do you need for a construction loan in Ontario?

Most lenders require a minimum of 20–25% down for a construction mortgage. Some require more depending on your credit profile, income type, and the complexity of the build. Because the property doesn't exist yet as collateral in the traditional sense, lenders want more equity upfront. CMHC-insured construction products exist but have specific eligibility requirements.

Can you get a construction loan if you're self-employed?

Yes. It requires the right lender. Most major banks apply the same rigid T4-income criteria to construction mortgages as they do to purchase mortgages, which means self-employed borrowers often get declined even with strong financials. B-lenders and specialist construction lenders are far more flexible about how they document self-employment income. Work with a broker who has placed construction files before.

What is a draw schedule and how does it work?

A draw schedule is the lender's roadmap for releasing funds in stages as your build progresses. Typical milestones include: foundation complete, framing complete, lock-up (windows and doors installed, building is weather-tight), drywall complete, and final completion. Before each draw is released, the lender orders an inspection to confirm that stage of work is done. Your GC invoices against completed work, not projected work.

What happens if construction costs go over budget?

Cost overruns are one of the biggest risks in construction financing. Most lenders won't advance funds beyond the original approved amount. If costs exceed the budget, you'll need to cover the difference from your own funds or arrange supplementary financing, which is more difficult mid-build. This is exactly why a fixed-price contract with a licensed GC is a non-negotiable for most lenders.

Can you get a construction mortgage for a major renovation or addition?

Yes. Draw-mortgage structures are used for both new builds and significant renovations or additions where the work substantially changes the home's value and scope. The qualification process is similar: fixed-price contract, permits, and draw inspections. For smaller renovations, a HELOC or refinance is usually simpler and cheaper than a full construction mortgage structure.

Do you pay interest during construction?

Yes. During the construction phase, you pay interest only on the funds that have been drawn, not on the full approved amount. As each draw is released, your interest payments increase. Full principal-and-interest payments begin once the loan converts to a permanent mortgage at completion. Budget for these interest payments in your construction cash flow plan.