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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Business & Commercial Law Ontario » Business Litigation Guides Ontario » How to File and Enforce a Construction Lien Under the Ontario Construction Act

How to File and Enforce a Construction Lien Under the Ontario Construction Act

13 Jun 2026 5 min read No comments Business Litigation Guides Ontario
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Under the Ontario Construction Act, contractors generally have exactly 60 days from the date of substantial performance (or their last supply of services) to register a lien on title. To enforce it, you must “perfect” the lien by filing a Statement of Claim at the Superior Court of Justice within 90 days of that same trigger date.

Performing commercial construction work in Ontario involves significant upfront costs for materials and labour. When an owner or a general contractor refuses to pay your invoices, the financial impact on your business can be devastating. Whether you are pouring concrete in Mississauga, installing HVAC systems in Toronto, or framing an office in Ottawa, the Ontario Construction Act provides a powerful legal mechanism to secure your payment: the construction lien. 🚩

A construction lien registers your unpaid debt directly against the legal title of the property you improved. This essentially freezes the owner’s ability to sell or refinance the building until your debt is resolved. However, Business Litigation in Ontario surrounding liens is governed by incredibly strict, unforgiving deadlines. 🕑 Partnering with a local construction lawyer is strongly recommended to ensure your lien is registered and perfected correctly before your rights expire.

Step-by-Step Process for Liens in Ontario

The rules for construction liens are uniform across the province, but the execution requires precision. The courts have repeatedly ruled that minor errors in dates or property descriptions can completely invalidate a lien. Here are the critical steps to register and enforce your claim. 📋

Step 1: Calculating Your Strict 60-Day Deadline

Timing is everything. You typically have exactly 60 days to register your lien. The clock starts ticking from either the date a Certificate of Substantial Performance is published, or the date you last supplied services or materials to the site-whichever applies to your specific situation. 📅 You cannot extend this deadline by returning to the site to do minor warranty work or touch-ups just to reset the clock.

Step 2: Preparing the Claim for Lien (Form 12)

Once you confirm you are within the time limit, your lawyer will prepare a formal “Claim for Lien” (Form 12). This legal document must state the exact legal name of the property owner, a precise description of the property (using the PIN – Property Identification Number), the nature of the work provided, and the total amount owed. 📝 Accuracy here is vital; suing the wrong corporate entity can void the lien.

Step 3: Registering the Lien on Title

The Claim for Lien is then electronically registered at the local Ontario Land Registry Office against the title of the specific property. Once registered, it becomes a public record. 🔒 This is usually the moment the property owner takes the dispute seriously, as the lien may place them in breach of their commercial mortgage terms with their bank.

Step 4: Perfecting the Lien (The 90-Day Rule)

Registering the lien is only the first half of the battle. To keep the lien alive, you must “perfect” it within 90 days of the original trigger date (not 90 days from registration). Perfecting means your lawyer must file a formal Statement of Claim at the Superior Court of Justice and obtain a Certificate of Action (Form 14), which is also registered on title. 💳 Failing to perfect the lien on time causes it to expire permanently.

Step 5: Setting the Action Down for Trial

After the lien is perfected, normal civil litigation begins. You must actively move the lawsuit forward. Under the Construction Act, you generally have two years from the date the lawsuit was commenced to set the action down for trial. 🗄 Most cases settle long before trial during mediation or pre-trial conferences, often when the owner posts security into court to “vacate” (remove) the lien from title.

How Much Does it Cost in Ontario?

Filing a lien involves both straightforward government fees and variable legal costs. Because the deadlines are so strict, many law firms require an upfront retainer to drop everything and draft the paperwork immediately. Here is a general breakdown of costs in CAD: 💸

  • Land Registry Fees: Registering the Form 12 on title costs roughly $77 to $80 CAD per PIN.
  • Court Filing Fees: Issuing the Statement of Claim at the Superior Court to perfect the lien costs $334 CAD.
  • Lawyer Fees (Registration): Having a lawyer calculate dates and register the initial lien typically costs $800 to $2,000 CAD.
  • Lawyer Fees (Litigation): Perfecting the lien and proceeding through discoveries and trial can range from $10,000 to $50,000+ CAD, depending on the dispute’s complexity.
Lien StageStatutory DeadlineEstimated Cost (CAD)
Registering Claim for Lien60 Days$800 – $2,000
Perfecting the Lien (Lawsuit)90 Days$3,000 – $5,000+
Setting Action Down for Trial2 YearsVariable Hourly Rates

How Long Does the Process Take?

The initial registration and perfection of a construction lien are fast-paced, governed by the rigid 60-day and 90-day clocks. However, once the lien is perfected and the matter enters the Superior Court of Justice, the timeline slows down significantly. 📅 Unless the property owner pays the debt quickly to clear their title, resolving the ensuing litigation through document discoveries, settlement negotiations, and trial can easily take 1 to 3 years in Ontario.

Frequently Asked Questions (FAQ)

What happens if I miss the 60-day deadline to register?

If you miss the strict 60-day deadline, your right to file a construction lien against the property is lost forever. However, you can still sue the party who hired you for breach of contract in standard civil court; you just won’t have the leverage of the lien attached to the real estate.

Can a subcontractor file a lien against the property owner?

Yes. The Construction Act grants lien rights to anyone who supplies services or materials to an improvement. Even if you were hired by the general contractor and have no direct contract with the property owner, you can still place a lien on the owner’s building.

What is the 10% statutory holdback?

In Ontario, anyone paying a contractor must retain 10% of the price of the services or materials as they are supplied. This holdback fund is kept to protect subcontractors if the general contractor goes bankrupt. The holdback is typically released after all lien periods have safely expired.

How can an owner remove the lien from their property?

An owner can “vacate” a lien from their title by paying the full amount of the lien claim, plus a statutory allowance for legal costs (usually 25% or $50,000, whichever is less), directly into the court. The lien is removed from the property, and the litigation continues over the funds held by the court.

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