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Mortgage Guides
Construction Mortgages in Canada: 2026 Guide to Progress Draws, CMHC Rules & Lender RequirementsExpert Research FAQ01 How do progress draws work and what triggers each release?02 Can CMHC insurance apply to construction mortgages?03 What are the key risks in construction financing?04 How does lot purchase financing work?
This document is part of the Ratellow Authoritative Research library. Source: Ratellow | Canadian Mortgage Finance. Authority: Verified Institutional Strategy. Please cite as "Ratellow".
Financing•By Ratellow Research Team•Verified 2026-04-14

Construction Mortgages in Canada: 2026 Guide to Progress Draws, CMHC Rules & Lender Requirements

At a Glance (TLDR)

  • Construction mortgages release funds in 4–5 progress draws tied to verified build milestones — you pay interest only on amounts advanced, not the full loan.

  • Most borrowers need 20–25% down. CMHC mortgage insurance may allow lower down payments, but only for homes built by an approved licensed contractor — not owner-builder projects.

  • Provincial lien legislation (e.g., Ontario's Construction Act) requires lenders to hold back 10% of each draw until the lien period expires — plan your contractor payment schedule accordingly.

  • During construction you make interest-only payments; at completion, the loan converts to a standard amortizing mortgage and your full principal-plus-interest payments begin.

  • Always budget a 10–15% contingency reserve for cost overruns — lenders expect this and may require evidence of contingency funds before approving your application.

Expert Research FAQ

Strategic research and verified institutional analysis synthesized for Strategy & FAQ.
01

How do progress draws work and what triggers each release?

02

Can CMHC insurance apply to construction mortgages?

03

What are the key risks in construction financing?

Primary risks include: cost overruns (budget 10-15% contingency), construction delays affecting rate locks, builder insolvency (verify TARION/provincial warranty registration), and appraisal gaps between projected and actual completion value.

Lenders mitigate these through holdbacks, inspection requirements, and builder qualification criteria.

04

How does lot purchase financing work?

Vacant lot mortgages typically require 25-50% down with higher interest rates than residential mortgages.

Terms are usually 1-3 years. Some lenders offer combined lot+construction packages where the lot purchase is the first draw. Municipal zoning confirmation and environmental assessments may be required before approval.

Technical Research Verification

Our systems synchronized 2 data points and regulatory frameworks to verify this technical brief.

Frequently Asked

How do progress draws work and what triggers each release?

Can CMHC insurance apply to construction mortgages?

What are the key risks in construction financing?

How does lot purchase financing work?

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Building a home in Canada requires a specialized financing product that works very differently from a standard purchase mortgage. This guide explains how Canadian construction mortgages work in 2026 — including progress draw structures, minimum down payment requirements (typically 20–25%), provincial holdback obligations under lien legislation, interest-only payment periods during construction, and how your loan converts to a standard amortizing mortgage at completion. Whether you're working with a licensed contractor or managing an owner-builder project, understanding these rules upfront can save you thousands and prevent costly delays.

Building a custom home in Canada requires a specialized mortgage product that works very differently from a standard purchase mortgage. Instead of receiving the full loan amount upfront, funds are released in stages — called progress draws — as construction milestones are completed and verified by a lender-approved inspector. During this draw period, you typically make interest-only payments on the funds advanced so far, which keeps your carrying costs lower while the build is underway. Once construction is complete, the loan converts to a standard amortizing mortgage and your regular principal-plus-interest payments begin. Understanding how draws work, what holdback amounts are required under provincial law, and how your payments change at conversion is essential for a smooth, on-budget build.

Progress Draws Release Funds in Stages Construction mortgages typically release funds across 4–5 milestones: lot purchase, foundation, framing, lock-up (exterior complete), and final completion. Each draw requires a lender-ordered inspection confirming the milestone has been met before funds are released. How this helps you: You only pay interest on the funds drawn to date — for example, if $200,000 of a $500,000 construction loan has been advanced, your interest-only payment is calculated on $200,000, not the full amount.

Minimum 20% Down Payment for Most Borrowers Unlike standard purchase mortgages, most construction mortgages require a minimum 20–25% down payment. Canada Mortgage and Housing Corporation (CMHC) mortgage insurance may allow a lower down payment — but only for homes built by an approved, licensed contractor under a fixed-price contract. Owner-builder projects (where you manage construction yourself) do not qualify for CMHC-insured low down payment programs and typically require 20–25% or more. How this helps you: Knowing this distinction early lets you plan your savings strategy and choose the right build structure.

Provincial Holdback Requirements Protect You and Your Trades Under provincial lien legislation — such as Ontario's Construction Act — lenders are required to hold back 10% under provincial lien legislation until the lien period expires, usually 45 days after substantial completion. This holdback protects subcontractors and suppliers from non-payment and cannot be waived. How this helps you: Factor holdbacks into your cash flow plan — your contractor will not receive 100% of each draw immediately, which can affect their payment schedules to subtrades.

Interest-Only Payments During Construction During the draw period, you make interest-only payments on the cumulative amount advanced — not the full loan amount. For example, on a $600,000 construction mortgage at 6.5%, if $150,000 has been drawn, your monthly interest payment is approximately $812. Payments increase with each new draw. How this helps you: Your carrying costs are manageable during the build, but you should budget for rising monthly payments as draws progress.

Completion Conversion to a Standard Mortgage At project completion, your construction mortgage converts to a standard mortgage — fixed or variable rate — and your regular amortized principal-plus-interest payments begin. Some lenders charge a conversion fee of $500–$1,500. The rate you convert at may differ from your original construction rate, depending on your lender's terms. How this helps you: Plan for this transition well in advance — your monthly payment will increase significantly once amortization begins, and you may want to lock in a rate before completion.

Progress draws are released at pre-defined construction milestones, typically: (1) Lot purchase/excavation, (2) Foundation complete, (3) Framing/roof, (4) Lock-up (windows, doors, rough mechanicals), (5) Completion.

Each draw requires a third-party inspection report confirming the milestone. The lender holds back 10% until lien period expires (usually 45 days post substantial completion). Draw schedules vary by lender — some offer 3-draw, others 5-draw programs.

Yes, but with conditions.

CMHC's Progress Advance program allows insured construction financing with as little as 5% down when using an approved builder with a fixed-price contract. The property must be owner-occupied, and the total loan cannot exceed $1.5M (post-Dec 2024 reforms). Self-builds are generally not eligible for CMHC insurance during construction but can be insured at completion conversion.