Cannabis Clause Ontario Real Estate: Grow Op Clauses

Published 11 September 2026 · By Jatin Dua, Broker of Record, RE/MAX Quantum Realty

Last updated 11 September 2026. Written by Jatin Dua, Broker of Record at RE/MAX Quantum Realty, 799 The Queensway, Etobicoke · For Ontario registrants · 10 min read

The short answer

There are two cannabis clauses in the OREA guidelines and they point in opposite directions. CANNABIS-1 is a buyer acknowledgement: the buyer accepts that the property may have been used for cannabis production, that the seller gives no representation about the state of repair, and that the property is taken as is. CANNABIS-2 is a seller warranty that the property was not so used, surviving completion. The trap is that CANNABIS-1 arrives in a counter-schedule looking like a disclosure and gets initialled as boilerplate. It is not a disclosure. It is a release, and signing it strips your buyer of the seller representations they were relying on.

The acknowledgement arrives looking like a disclosure

This is how the file goes wrong. Your buyer offers on a detached house that has been renovated recently and is priced a little below where it should be. The counter comes back with an extra page and one of the paragraphs on it is CANNABIS-1. You read it quickly, you see the word acknowledges, and you tell your buyer it is the seller covering themselves. They initial it. Eight months later the insurer non-renews, the buyer discovers what the basement was, and everybody looks at you.

Read what the clause does rather than how it opens. The buyer is made to acknowledge that this property, and whatever stands on it, may at some point have been used for cannabis — grown, propagated, harvested, sold or moved on. The seller then makes no representation or warranty about the state of repair. And the buyer accepts the property in its present condition, as is.

The short version

CANNABIS-1 is a listing-side clause. If it appears in a counter, stop, tell your buyer plainly what it removes, and ask the other side directly what they actually know. An acknowledgement that something may have happened is not an answer to the question of whether it did.

The two clauses, side by side

Pull the current wording from your own OREA member copy before you use either. This is the shape of them.

Code	Whose clause it is	What it does	What it does not do
CANNABIS-1 (Buyer Acknowledgement)	The seller’s, despite the name	Puts the buyer on notice of possible cannabis-related use, withdraws any seller representation about condition, and has the buyer take the property as is	It discloses nothing specific. It does not tell your buyer whether anything actually happened, or what was done about it
CANNABIS-2 (Seller Represents and Warrants)	The buyer’s	Seller warrants there was no such use while they owned it, and gives a knowledge-and-belief warranty covering the years before that, both surviving completion	It does not reach what the seller genuinely did not know, and the knowledge half is weaker than the ownership half in two separate ways
REP/WARR-1 (Seller Not Liable)	The seller’s	Records one specifically identified and disclosed possible latent defect, with the buyer taking on their own due diligence for that item	It is not a general as-is clause and should never be used as one, including here
REP/WARR-5 (Warranties – Survive Completion)	The buyer’s	Makes stated warranties survive rather than merge on completion	It does not change what the warranty says, or when the warranty speaks
INSP-7 (Condition – Inspection of Property – Third Party)	The buyer’s	Lets you name a specific specialist rather than a general home inspector as the person doing the looking	It does not find you that specialist, and availability inside a short condition window is on you

CANNABIS-2 has two tiers, and the second one is weaker in two ways

The seller warranty is built in two layers. For the years this seller has held title, it is an outright promise that none of the listed cannabis activities took place. Reach back before that and the promise softens into what the seller knows and believes.

That is sensible drafting. A seller cannot promise what happened under an owner three transfers back. But be clear with your buyer about what the second tier is worth. It has two separate weaknesses. First, it is only as good as what this seller happened to learn, and a seller who bought a quietly remediated property from someone who said nothing knows nothing, warrants nothing, and has done nothing wrong. Second — and this one is genuinely easy to miss — the list of activities in the knowledge-qualified tier is narrower than the list in the ownership tier. Read both lists in your own copy side by side and you will see it.

There is a third point and it has now been litigated. A warranty framed by the seller’s knowledge speaks as at signing. It is not a continuing promise retested up to closing unless somebody drafts it that way. In Coppendale v. Mills, 2025 ONSC 5192, as reported, buyers relying on a knowledge-framed seller warranty refused to close after discovering a problem before completion, and the court read the warranty as speaking to what the seller knew at signing. The buyers forfeited a twenty-thousand-dollar deposit and were ordered to pay a further $206,703.56. The drafting behind it is in representations and warranties in an Ontario APS.

A KNOWLEDGE WARRANTY IS NOT A CLEAN BILLIf your buyer is proceeding on the strength of CANNABIS-2 rather than on testing, be explicit in writing: the knowledge-qualified half tells them what this seller knew when they signed, over a narrower list of activities than the ownership half, and it is not evidence that nothing happened. Coppendale shows what it costs a buyer to confuse a warranty with an inspection.

Lawful production is still production

The activities the clauses reach are defined by reference to the federal and provincial cannabis legislation — growing, propagating, harvesting, and on the ownership tier also selling and moving product — and none of that is limited to unlawful conduct. Lawful personal production in a house is still production. It still involves moisture and electrical load, and it still falls inside the language of the clause.

Stigma and damage are two different problems

Damage is physical: moisture, mould, altered wiring, modified ventilation, structural changes made to accommodate equipment. It is capable of being found, tested and costed.

Stigma is not physical at all. RECO Bulletin 7.5 treats a stigma as a non-physical attribute of a property that may cause a psychological or emotional response in a buyer, and it lists remediated grow-operations expressly alongside criminal use, deaths on the property, notorious former owners and reported hauntings. The bulletin is clear that stigma is entirely subjective — what troubles one buyer is irrelevant to the next. Its practical guidance is that buyers’ representatives should identify their client’s concerns early and may need protective clauses to address them, and that sellers’ representatives should obtain written instructions from their seller.

Two different questions, asked separately

Ask your buyer: is your concern that the house might be damaged, or that the house has a history? If it is damage, you need testing and you need it inside the condition window. If it is history, no report solves it and you should be screening properties differently. Most buyers have not separated the two until somebody makes them.

The listing side: what has to be disclosed

Patent defects — things a reasonable inspection would reveal — need not be disclosed, on caveat emptor logic, but actively concealing one removes that protection. Latent defects that render a property unfit for habitation or dangerous must be disclosed. Where the seller’s representative knows of such a fact, the expectation is that they disclose it to every interested buyer, use best efforts to obtain an acknowledgement from each, and give each a copy. Those duties come out of case law rather than the TRESA regulations.

Apply that to a former production property. Remediated and documented, with the alterations visible: probably a patent situation, and the documentation is the answer. Remediated cosmetically over an unaddressed moisture or electrical problem: that is the fact pattern the active concealment principle is aimed at, and fresh drywall over an unremediated wall is not a neutral act. Whether a specific set of facts falls one side or the other is a legal question for the seller’s lawyer, and I would want the seller getting that advice rather than taking mine.

A general home inspection will not settle this

What actually answers the question is targeted work: air quality and mould sampling with laboratory analysis, an electrical assessment by somebody qualified to look at whether the service and panel were altered, and where there has been remediation, the remediation documentation itself — who did it, to what protocol, and what the post-remediation verification showed. That is not a two-hour walkthrough. It is several specialists, some of whom need a laboratory turnaround.

Two drafting consequences follow. The condition window has to be long enough for a lab result, which is not a number you should guess at — call the firm before you draft the date. And INSP-7 exists precisely so the person doing the inspecting can be named rather than left as a general home inspector. Use it where the question is specialised. There is more on how those conditions are structured, and how the discretion in them works, in home inspection condition wording.

Two things I am not going to give you numbers on. As a matter of market practice — and I am describing what I see, not stating a rule — insurers and lenders treat production history differently from one file to the next, and coverage or financing that is straightforward for one buyer is refused or surcharged for another. Get your buyer talking to their own insurer and their own lender about the specific property, early, rather than relying on anybody’s general assurance including mine.

Your exposure as the registrant

RECO’s guidance on the standing UFFI warranty in the standard agreement makes the principle plainly, and the instinct carries directly across to here: representations must reflect only the seller’s own personal knowledge, and a registrant who has actual knowledge that the subject matter of a warranty exists cannot stand by while their seller gives an untrue warranty. If a seller tells you about a past operation and then wants to sign CANNABIS-2 without qualification, that is not a conversation you can have quietly. It goes to the seller’s lawyer and the schedule changes.

On the buyer’s side, the exposure is the reassurance. Do not tell a buyer a property has been remediated unless you have seen the documentation and you are passing it on rather than characterising it. Do not tell a buyer their insurance will be fine. Do not tell a buyer that a clean home inspection means there is no issue. Every one of those sentences will be produced later, and none of them were yours to say.

And if the party on the other side is self-represented, the TRESA position is not flexible. Confirm they intend to proceed unrepresented, deliver and explain the RECO Information Guide and the Information and Disclosure to Self-Represented Party form, tell them plainly that you represent your client and not them, and make reasonable efforts to get a written acknowledgement of that form. Then keep your hands off their terms. Telling an unrepresented seller which cannabis clause to use, or an unrepresented buyer whether an acknowledgement is safe to sign, is advice on clauses and it is not available to you.

How I handle a suspected production file

Ask the direct question of the listing side in writing, early, and keep the answer. Not whether there was a grow-op — whether cannabis has ever been grown, produced or sold from the address, lawfully or otherwise.
Separate your buyer’s two concerns before you draft anything: physical condition, and history. They need different responses.
If the concern is physical, line up the specialists before you pick the condition window, and confirm the laboratory turnaround rather than assuming it.
Use a named-specialist inspection condition rather than a general one where the question is specialised.
Ask for the remediation documentation itself, not a description of it, and pass it on without characterising it.
Send your buyer to their own insurer and their own lender about the specific address, before they go firm.
If CANNABIS-1 appears in a counter, treat it as a change to the risk allocation of the whole deal and explain it that way. If your buyer signs it anyway, put the explanation in writing the same day.

The last one is the discipline that matters most, because the acknowledgement clause is the one that will actually cross your desk. Nobody sends you a cannabis warranty out of nowhere. They send a page of extra paragraphs at the end of a long negotiation, and one of them quietly moves the condition risk onto your client.

Questions agents actually ask

What does CANNABIS-1 actually do to my buyer?

Three things at once. It has the buyer acknowledge that the property may have been used for cannabis-related activity, it removes the seller’s representation and warranty about the state of repair, and it has the buyer accept the property as is. It discloses no specific fact. If it appears in a counter-offer, treat it as a change to the risk allocation of the entire transaction rather than as a standard paragraph.

What is the difference between the two halves of CANNABIS-2?

For the period the seller has owned the property the warranty is unqualified. For the period before that it is limited to the best of the seller’s knowledge and belief, and the list of activities in that second tier is narrower than in the first. Read both lists in your own OREA copy side by side. The knowledge-limited half is only as good as what this particular seller happened to learn.

Does a home inspection find a former grow operation?

A standard visual home inspection is not the right tool. What answers the question is air quality and mould sampling with laboratory analysis, an electrical assessment by someone qualified to evaluate altered service and panels, and the remediation documentation itself. That takes several specialists and a laboratory turnaround, so call the firms before you set the condition window rather than guessing at the number of days.

Is a remediated property still a problem?

It can be, for reasons that have nothing to do with condition. RECO Bulletin 7.5 treats a stigma as a non-physical attribute that may cause a psychological or emotional response, and it lists remediated grow-operations expressly. Stigma is entirely subjective, so no report resolves it. Buyers’ representatives should identify the concern early, and sellers’ representatives should obtain written instructions from their seller.

What does a seller have to disclose about past cannabis production?

Under the framework in RECO Bulletin 7.4, patent defects need not be disclosed on caveat emptor logic, but actively concealing one removes that protection, and latent defects rendering a property unfit for habitation or dangerous must be disclosed. Where the seller’s representative knows of such a fact they are expected to disclose it to every interested buyer, use best efforts to obtain acknowledgements, and give each a copy.

My seller grew cannabis legally at home. Can they sign CANNABIS-2?

Not the unqualified half of it. The activities described in the clause are not limited to unlawful conduct, so lawful personal production during the seller’s ownership sits inside the language. Raise it before the schedule goes out, send the seller to their own lawyer, and have the warranty drafted to reflect what the seller can honestly say. A registrant should not let an untrue warranty go out unchallenged.

The clause checklist I make my own agents use

A one-page pre-submission check for conditions and schedules — the dates, the notice route, and the eight things that get missed. Built for Ontario agents. Free, and there is no drip campaign behind it.

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Who reads the extra pages on your counters?

Acknowledgement clauses arrive at the end of a long negotiation when everyone is tired, and that is exactly when risk gets moved onto a client. At my brokerage those schedules get a second read before they go back. If nobody is doing that for you, it is worth a conversation.

Book a 15-minute call or call or text 833-330-1925.

If the honest answer is that your current brokerage is fine, I will tell you that.

Cannabis Clauses in Ontario Real Estate: The Acknowledgement Trap