Your Tenant’s Renovation, a Lien on Your Building: How Ontario Commercial Landlords Are Actually Protected
The “Notice of Non-Responsibility” you read about on a US or Alberta site does not exist here. Ontario hands landlords a different, narrower set of tools.
My commercial tenant is gutting the unit and hiring their own trades. If one of them goes unpaid and liens my building, how exposed is my ownership — and what actually shields it in Ontario?
Two things decide it, and neither is a form you file. First, your exposure is capped at 10% of any improvement payment your lease “accounts for” under s.19(1) — and only if the lease accounts for it at all (a tenant improvement allowance is the classic trigger). Second, that cap disappears under s.19(5) if you meet the statutory definition of owner, which turns on whether the work was done “at your request,” not merely with your consent or for your benefit. The Alberta/US “Notice of Non-Responsibility” that landlords go hunting for simply is not in the Ontario Construction Act — so the protection has to come from the cap, the owner test, and how the lease is written.
Source: Ontario Construction Act, R.S.O. 1990, c. C.30, ss. 1(1), 14, 15, 18, 19(1)–(5), 22, 31, 36; e-Laws current consolidation (from 2026-01-01), verified 2026-08-22.
I’m Arthur Zhao. Here’s the moment this question usually lands on my desk: a commercial deal is closing, the tenant wants to build out the space before opening, and someone — often the landlord’s own lawyer — asks whether a subtrade the landlord never hired could end up with a lien on the landlord’s building. It can. The tenant hires the general contractor, a sub down the chain goes unpaid, and a construction lien lands on title to premises the landlord owns outright.
The instinct — especially for anyone who has done deals in the US or out west — is to reach for a “Notice of Non-Responsibility.” Ontario doesn’t have one. I read the current Construction Act end to end; the concept isn’t in it. So the rest of this piece is about what Ontario landlords actually rely on instead, and the one move that quietly makes a landlord’s problem much worse.
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First, the tool you came looking for isn’t here
If you have leased commercial space in Alberta, BC, or much of the US, you have probably met the Notice of Non-Responsibility: a notice a landlord posts or registers before a tenant’s work starts, declaring the improvement isn’t the landlord’s and the landlord’s interest shouldn’t be lienable. Ontario has no such thing. I pulled the current Construction Act (R.S.O. 1990, c. C.30) and searched it end to end — the phrase and the concept are simply absent.
So instead of a form, Ontario landlords answer two questions, in order: (1) Is my interest even exposed? and (2) If it is, how much — and did I do something that removes the cap? The rest of this article is those two questions.
ℹ️Cross-jurisdiction note: construction-lien law is provincial, and the rules differ a lot between provinces. The “register a non-responsibility notice” move you may know from the US, Alberta, or BC does not work in Ontario. When you read material from elsewhere, confirm the rule is actually Ontario’s.
Question 1: Is the landlord’s interest even exposed?
A construction lien arises the moment a worker or supplier first supplies services or materials to the improvement (s.15), and it attaches to the interest of the owner in the premises (s.14). For a landlord, the gateway is s.19(1): where the interest a lien attaches to is leasehold, the landlord’s interest is caught only if payment for all or part of the improvement is “accounted for” under the lease, a renewal, or a related agreement the landlord is party to.
Read that carefully — the trigger is not the tenant renovating. It is the lease accounting for the payment. The everyday example is a tenant improvement allowance: landlord money for the build-out, written into the deal. Where the tenant pays for everything and the lease is silent about the work, the landlord’s freehold interest is generally not caught at all.
The provision people mistake for a landlord’s escape hatch
Question 2: How much — and the trap that removes the cap
If Question 1 puts you inside s.19(1), the good news is a ceiling; the bad news is a trap that can lift the ceiling entirely. Take them in that order.
The 10% ceiling (s.19(1))
The s.19(5) trap: becoming an “owner”
owner. Where that finding is made, the 10% cap does not apply — exposure is the full amount.
So what makes a landlord an “owner”? Under s.1(1), an owner is a person with an interest in the premises at whose request — and (a) on whose credit, (b) on whose behalf, (c) with whose privity or consent, or (d) for whose direct benefit — an improvement is made. The words “at whose request” are a mandatory, standalone requirement that must be met in addition to one of (a)–(d); they are not one option among four. Consent alone, or benefit alone, is not enough. The practical line: funding a build-out (an allowance) generally keeps you inside the 10% cap; directing it — requiring the tenant to build to your specification, for your purpose — can push you across into “owner,” where the cap is gone.
🚨s.19(5) is the trap in this whole topic: the 10% cap only shields a “pure” landlord. Step from funding the work to requiring it built to your specification and you can be found to be an owner — cap gone, full exposure. The test is s.1(1)’s “at whose request,” which must be satisfied on top of one of (a)–(d); consent or benefit alone does not make you an owner.
A point that surprises landlords: the statutory holdback isn’t yours
Landlords often assume the Construction Act’s 10% statutory holdback (Part IV) protects them automatically. It doesn’t. Under s.22(1) the holdback is retained by the payer — the person liable to pay under the contract. In a tenant-arranged fit-out, the party paying the general contractor is the tenant, so the tenant holds the holdback and gets its benefit. The landlord is not on that contract chain and holds back nothing. That is exactly why the third protection — the lease — is the one a landlord actually controls.
What actually protects you: the lease
The first two protections are ceilings the statute hands you; you cannot change them. The lease is where a commercial landlord adds real protection. Typical tenant covenants (have your real estate lawyer draft to the specific deal):
• a covenant to pay all contractors and to discharge any lien — by bonding it off or paying it out — within a set number of days of registration;
• a requirement that the tenant provide its construction contract and proof of holdback, so the payer is actually retaining the 10% s.22 requires;
• a prohibition on any lien reaching the landlord’s freehold, with registration deemed a default that lets the landlord step in, discharge, and recover from the tenant;
• staging the allowance against lien clearances and completion, rather than paying it all up front.
None of this rewrites the Construction Act. It pre-locks the cleanup cost and the recovery path onto the tenant, where a landlord wants them.
⚠️This is general information, not legal advice. Lease clauses must be drafted by a licensed real estate lawyer for your specific deal. Note too that lien timelines are short: under s.31 a lien is generally preserved within 60 days of the relevant last-supply/completion trigger, and under s.36 perfected within a further 90 days. The moment a claim for lien is registered against your premises, get a lawyer — don’t wait.
💡 My own read: for a commercial landlord, the real construction-lien danger is almost never the tenant’s self-funded renovation — it is your own money going into the build-out through an allowance while the lien-protection clauses stay out of the lease. Allowances are standard, and fine; just remember the allowance is the s.19(1) trigger, and the moment you step from funding the work to dictating it, you can slide from a landlord capped at 10% to an “owner” exposed in full. Don’t hunt for a non-responsibility form that doesn’t exist — spend the effort getting the lease drafted right.
- Construction Act, R.S.O. 1990, c. C.30, s.1(1) definitions of “owner” and “payer” — e-Laws current consolidation
- Same statute: s.15 (lien arises on first supply), s.18 (joint/common interests), s.19(1)–(5) (leasehold and landlord)
- Same statute: s.22 (10% basic holdback, retained by the payer), s.31 (preservation, 60 days), s.36 (perfection, 90 days)
I Paid My Contractor in Full — So How Can There Be a Lien on My Home? An Ontario Construction Act Survival Guide for Homeowners →Why Your Bank Wants Your Landlord to Sign Away a Right Before Funding Your Equipment Loan →The Vendor’s Lien: The Unpaid Seller’s Claim That Can Survive a Commercial Closing →First-Time Renter Guide →
Frequently Asked Questions
Ontario has no Notice of Non-Responsibility — so what do commercial landlords use instead?
Three things, none of which is a filed form: s.19(1), which caps a landlord’s exposure at 10% of any improvement payment the lease accounts for; s.19(5), the test for when a landlord is instead treated as an “owner” with no cap; and the lease itself, where covenants to discharge liens and staged allowance payments move the risk back to the tenant.
Does giving my tenant an improvement allowance put my building at risk?
It is the classic s.19(1) trigger. Once the lease “accounts for” a payment — a TI allowance is the textbook example — the landlord’s interest becomes subject to the lien, but only to the extent of 10% of that payment. A tenant’s purely self-funded work that the lease is silent about generally does not reach the landlord’s freehold at all.
A subtrade my tenant hired went unpaid — can they really lien land I own?
Yes. Under s.15 a lien arises when a worker first supplies to the improvement, and it attaches to the owner’s interest in the premises regardless of who signed the contract. Whether it reaches you as landlord is then governed by s.19: exposed only if the lease accounts for the payment, and capped at 10% unless s.19(5) makes you an “owner.”
How fast do I have to act once a lien hits my property?
Quickly. Under s.31 a lien generally must be preserved within 60 days of the relevant last-supply/completion trigger, and under s.36 perfected within a further 90 days or it expires. Those are the claimant’s deadlines, but for a landlord they mean the same thing: the moment a claim for lien is registered against your premises, get a real estate lawyer to assess discharging or defending it — don’t wait.
Can I just terminate the lease to shake off the lien?
No. s.19(2) provides that no forfeiture or termination by a landlord, except for non-payment of rent, deprives a lien claimant of its lien. Even on a rent-default termination, s.19(3) requires you to notify every registered lien claimant of the unpaid rent, and s.19(4) lets them pay that rent within ten days and add it to their own lien claim.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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