Building a custom home in Canada is exciting but financing the construction is fundamentally different from buying an existing property. Construction loans are specialized products with unique structures, higher requirements, and more involved processes than a standard mortgage. This guide explains how they work, what you need to qualify, and how to navigate the draw schedule from foundation to completion.
What Is a Construction Loan?
A construction loan is a short-term loan used to finance the building of a new home. Unlike a conventional mortgage where you receive the full loan amount at closing, a construction loan releases funds in stages (called draws) as construction progresses. During the build, you pay interest only on the amount that has been drawn. Once construction is complete, the loan either converts to a permanent mortgage or you arrange a separate mortgage to pay it off.
Construction loans are higher risk for lenders because they are lending against a property that does not yet exist. This is why they come with stricter qualification requirements, higher interest rates, and more oversight.
Types of Construction Loans
There are two main types of construction loans available in Canada.
Construction-to-permanent (single close). This combines the construction loan and permanent mortgage into one product. You close once, build, and upon completion the loan converts to a regular mortgage at a pre-agreed rate. This is the most convenient option and saves on closing costs.
Standalone construction loan. This is a separate short-term loan for the construction period only. Upon completion, you must arrange a new conventional mortgage to pay off the construction loan. This involves two sets of closing costs but may offer more flexibility in choosing your permanent mortgage.
Construction Loan vs Regular Mortgage
| Feature | Construction Loan | Regular Mortgage |
|---|---|---|
| Disbursement | In stages (draws) | Full amount at closing |
| Interest payments | Interest-only on drawn amount during construction | Principal and interest from day one |
| Term | 6–18 months (construction period) | 1–10 years (typically 5) |
| Interest rate | Prime + 1%–2% (5.5%–7.0%) | Posted or discounted fixed/variable rates |
| Down payment | 25%+ of total project cost | 5%–20% depending on purchase price |
| Appraisal | Based on completed value (as-if-complete appraisal) | Based on current market value |
| Lender oversight | Draw inspections at each milestone | Minimal after closing |
| Qualification | Stricter (detailed plans, builder contract required) | Standard income and credit requirements |
How Draws Work
The draw schedule is the backbone of a construction loan. Your lender releases funds at specific construction milestones after an inspector verifies the work has been completed.
| Draw | Milestone | Typical % of Loan | What Must Be Complete |
|---|---|---|---|
| 1 | Foundation | 15%–20% | Excavation, foundation poured, backfill |
| 2 | Framing | 20%–25% | Structure framed, sheathed, roofed |
| 3 | Lock-up | 20%–25% | Windows, doors, exterior closed in |
| 4 | Drywall and mechanical | 15%–20% | Plumbing, electrical, HVAC, drywall hung |
| 5 | Completion | 15%–20% | Finishes complete, occupancy permit issued |
Holdback. Most provinces require a construction lien holdback of 10% for 45 to 60 days after substantial completion. This protects against claims from unpaid subtrades. The holdback is released after the lien period expires with no claims.
Your lender will send an inspector before each draw. If the work is not complete or does not meet expectations, the draw may be delayed or reduced. Budget your personal cash flow to handle gaps between draws.
Requirements for a Construction Loan
Construction loans have stricter qualification criteria than standard mortgages.
| Requirement | Details |
|---|---|
| Down payment | 25%+ of total project cost (land plus construction) |
| Credit score | 680+ (some lenders 700+) |
| Income verification | Full documentation (T4s, NOAs, tax returns, 2 years if self-employed) |
| Detailed building plans | Architect or designer-stamped plans and specifications |
| Builder contract | Fixed-price or cost-plus contract with a licensed builder |
| Cost breakdown | Itemized budget for all construction costs |
| Appraisal | As-if-complete appraisal by a certified appraiser |
| Building permits | Approved permits from the municipality |
| Construction timeline | Estimated completion date (most lenders require under 12 months) |
If you already own the land, its equity can count toward your down payment. For example, if you own a $200,000 lot free and clear and the total project cost is $800,000, you effectively have a 25% down payment.
Current Construction Loan Rates
Construction loan rates are higher than conventional mortgage rates because of the additional risk and administration involved.
| Lender Type | Typical Rate | Notes |
|---|---|---|
| Big 5 banks | Prime + 0.5%–1.5% | Selective; prefer straightforward builds with established builders |
| Credit unions | Prime + 1%–2% | More flexible; often more experienced with construction loans |
| B-lenders | Prime + 2%–3% | For borrowers who do not qualify with A-lenders |
| Private lenders | 8%–12% | Last resort; shorter terms, higher fees |
As of early 2026, with the Bank of Canada prime rate at 4.70%, typical construction loan rates range from roughly 5.2% to 7.0% for A-lender and credit union borrowers.
Lenders Who Offer Construction Loans
Construction financing is a specialized niche. Not all lenders offer it, and those that do have varying levels of expertise and flexibility.
Big 5 banks (RBC, TD, BMO, Scotiabank, CIBC) offer construction loans but tend to be conservative. They prefer projects with established builders, straightforward designs, and strong borrower profiles. Turn times can be longer.
Credit unions such as Meridian, Coast Capital, Servus, and Libro are often the best option. They have more experience with custom builds, more flexible underwriting, and local market knowledge.
B-lenders like Home Trust and Equitable Bank serve borrowers who do not meet A-lender criteria. Expect higher rates and fees.
Mortgage brokers can be invaluable for construction loans because they have access to multiple lenders and understand which ones are most active in this space.
Construction Budget Breakdown
Building a home involves dozens of cost categories. A realistic budget is essential for loan approval and avoiding cost overruns.
| Category | Typical % of Total | Notes |
|---|---|---|
| Land | 25%–40% | Varies dramatically by location |
| Site preparation | 3%–5% | Excavation, grading, tree removal, servicing |
| Foundation | 8%–12% | Concrete, waterproofing, drainage |
| Framing and structure | 15%–20% | Lumber, trusses, sheathing, labour |
| Roofing | 3%–5% | Materials and installation |
| Exterior (windows, doors, siding) | 8%–12% | Energy-efficient windows add cost |
| Mechanical (HVAC, plumbing, electrical) | 12%–15% | Includes hookups and permits |
| Insulation and drywall | 5%–7% | Spray foam costs more than batt |
| Interior finishes | 10%–15% | Flooring, cabinetry, countertops, fixtures |
| Landscaping and driveway | 3%–5% | Often underbudgeted |
| Permits and fees | 1%–3% | Development charges, building permits |
| Contingency | 10%–15% | Essential buffer for unexpected costs |
A 2,000-square-foot custom home in Ontario (excluding land) typically costs $350 to $500+ per square foot to build in 2026, depending on finishes, complexity, and builder.
Common Pitfalls
Building a home is rewarding but fraught with potential issues.
Cost overruns. The most common problem. Changes during construction (change orders), material price increases, and unforeseen site conditions can push costs 10% to 30% above the original budget. Your 10% to 15% contingency is not optional.
Builder delays. Weather, supply chain issues, subtrade availability, and permit delays regularly extend timelines. A 12-month build that stretches to 18 months means additional interest costs on your construction loan.
Draw inspection disputes. If the lender’s inspector determines work is not sufficiently complete, a draw may be delayed. This can create cash flow problems for your builder. Clear communication between you, your builder, and your lender is essential.
Running out of contingency. If you spend your contingency early on upgrades or changes, you may not have a buffer for genuine surprises later. Protect your contingency for the unexpected.
Builder Selection and Contract Essentials
Choosing the right builder is the most important decision in a custom build. Your lender will also scrutinize the builder’s credentials.
Look for: Active membership in a provincial home builders association, proof of liability insurance and WSIB coverage, references from recent clients, and a portfolio of comparable builds. Visit current job sites to assess quality and organization.
Contract essentials: Ensure your contract includes a detailed scope of work, fixed or guaranteed-maximum price, payment schedule aligned with lender draws, a clear change order process with written approvals, warranty terms, and a realistic completion date with penalties for unreasonable delays.
The Bottom Line
Construction loans are more complex and expensive than regular mortgages, but they are the gateway to building a custom home in Canada. Expect to put down at least 25%, pay higher interest rates, and navigate a draw process with lender inspections at each milestone. A realistic budget with a 10% to 15% contingency, an experienced builder, and a lender familiar with construction financing are the three pillars of a successful build.