Ontario Heritage Act Designation Clause and the Conversation It Replaces

Last updated 11 September 2026. Written by Jatin Dua, Broker of Record at RE/MAX Quantum Realty, 799 The Queensway, Etobicoke · For Ontario registrants · 9 min read

The file that goes wrong

A buyer falls for a century home on a mature street. Their plan, which they described to you in the car, involves replacing the windows, opening the front porch and eventually putting a modern addition on the back. The listing agent mentions during negotiation that the property is designated. You add HERIT-1, everyone signs, the deal firms up, and the buyer closes.

Six months later the buyer discovers what their alteration plans involve at that municipality. They call you. And the document that gets pulled out of the file is the one you drafted, in which your client acknowledged the disclosure, accepted the property with the designation, and agreed to continue with the transaction.

That is the entire mechanism of HERIT-1 and it is worth being clear-eyed about it. It is a well-drafted clause for what it does. What it does is create a record that the buyer was told and proceeded anyway. That record protects the seller. It protects the listing brokerage. It does nothing whatsoever for the buyer except foreclose an argument they might otherwise have made.

Read the clause in pieces and notice what is missing

Pull HERIT-1 from your own OREA member copy. Four things happen in it: the parties acknowledge the property is or may be designated and is subject to the Ontario Heritage Act; the buyer acknowledges the seller made the disclosure; the buyer accepts the property with the designation; and the buyer agrees to continue with the transaction.

Now list what is not in it. No date. No deadline. No notice provision. No right of termination. No deposit return. No mechanism of any kind. Compare that to almost every condition you have ever written, which has a clock in it and an address for the notice. HERIT-1 has neither, because it was never intended to be a condition. It is the closing entry on a decision.

The two words that carry the risk: “is” and “may be”

HERIT-1 is drafted in the alternative. It covers a property that is designated and one that may be. That flexibility is useful and it is also where I see the clause misused.

If you know the property is designated, do not leave the clause reading as though the position is uncertain. You are creating a document that understates a fact you possess. If you genuinely do not know, then “may be” is honest — but it should not stay that way. A property either carries a designation or it does not, and it is checkable. Using the alternative wording to paper over the fact that nobody picked up the phone is not a drafting choice, it is an omission with a clause wrapped around it.

There is a related distinction worth learning, because agents collapse the two constantly. Ontario municipalities maintain a heritage register, and a property can appear on that register without carrying a designation. Being listed and being designated are not the same status and they do not carry the same consequences. Which one applies to the property in front of you is a question you confirm with the municipality’s planning or heritage staff, not something you infer from the age of the house or the presence of a plaque on the wall. Plaques get installed by historical societies and by proud owners. They are not evidence of anything legal.

Where HERIT-1 sits in the family of acknowledgement clauses

It helps to see HERIT-1 as one of a set. Several clauses in the OREA guidelines perform the same manoeuvre: they take something about the property that the buyer might otherwise object to and convert it into something the buyer has agreed in advance to accept. Once you see the pattern, the drafting discipline transfers across all of them.

In all three, the pre-printed part is easy and the diligence behind it is the work. I tell my agents the same thing about each of them: an acknowledgement clause is a photograph of a decision. Make sure there was a decision to photograph.

The case that shows what happens when the buyer changes their mind

Coppendale v. Mills, 2025 ONSC 5192 is not a heritage case, but it is the clearest recent illustration of what happens to a buyer who accepts a known risk and then tries to retreat from it. As reported, the buyers waived their inspection condition, discovered basement moisture before closing, and refused to complete, relying on a warranty qualified by the seller’s knowledge. The court read that warranty as speaking to the seller’s knowledge at signing rather than to the condition of the property at closing. The buyers forfeited a $20,000 deposit and were ordered to pay $206,703.56 in damages.

The lesson generalises. A buyer who signs an acceptance and then discovers the practical consequences of what they accepted is in a difficult position, and the difficulty compounds where the agreement contains an express acknowledgement that they were told. Refusing to close is not a low-cost protest. It exposes the buyer to the full loss on a resale plus costs, and the deposit is the smallest number in that arithmetic.

It also generalises to something more uncomfortable. When a buyer in that position looks for someone to blame, the file they ask about is yours — what was explained, when, and what the buyer was told about the clause they signed.

Your exposure as the registrant

Be careful about which regulatory framework you reach for here, because the obvious one does not fit. RECO Bulletin 7.4 addresses facts a seller has a legal obligation to disclose: patent defects generally need not be disclosed under caveat emptor, though actively concealing one removes that protection, and latent defects that render a property unfit for habitation or dangerous must be disclosed. Those duties come from case law rather than from the TRESA regulations. A heritage designation is not a defect at all — it is a public, registered attribute of the land. The latent defect analysis does not reach it.

Neither does the stigma framework in Bulletin 7.5, which concerns non-physical attributes that may produce a psychological or emotional response — criminal use, deaths, notorious former owners, reported hauntings, remediated grow operations. A designation is a legal constraint on what an owner may do, not a subjective association, and treating it as a stigma question sends you down the wrong road.

What does apply is the advertising rule and the duty you owe your own client. Under Bulletin 5.1 a misleading statement is one that causes someone to have a wrong idea or impression, and it does not matter that not everyone would be misled. Marketing a designated century home with language promising a blank canvas, or a renovation to the buyer’s taste, or a modern addition, is squarely within that test. So is a set of AI-rendered “potential” images showing alterations that may never be approved. The impression created is the thing being measured, not your intention in creating it.

And if the buyer is self-represented, Bulletin 2.4 governs the whole interaction. Confirm they intend to proceed unrepresented, deliver and explain the RECO Information Guide and the Information and Disclosure to Self-Represented Party form, say plainly that you act for the seller and not for them, and make reasonable efforts to obtain written acknowledgement of the form. Then do not advise them on price, terms or clauses. A self-represented buyer asking you to explain HERIT-1 before they sign it is asking for exactly the thing you are prohibited from providing. The correct answer is a lawyer’s name and a note in the file.

How I have my agents run a heritage file

1. Confirm the property’s actual status with the municipality in writing, and confirm whether it is designated, listed on the register, or neither. Do not rely on the listing, the plaque or the neighbourhood’s reputation.
2. If it is designated, get the terms of the designation itself, because designations are not generic and two houses on the same street can carry different constraints.
3. Check whether there is a registered heritage easement or agreement affecting the land, which is a separate instrument from the designation and may need to be handled through a title acknowledgement as well.
4. Write a due diligence condition with enough days for the buyer’s lawyer to read the designating instrument and for the buyer to get a meeting with heritage staff. That is weeks, not days, and municipal staff do not work on your offer timeline.
5. Put the buyer’s renovation plans in front of the municipality before the condition expires, in whatever form the municipality will look at them. A conversation about a specific plan is worth more than a general inquiry.
6. Once the buyer has the answers and decides to proceed, sign HERIT-1 to record that decision and put the underlying documents in the file behind it.

That sequence costs you nothing in a competing offer situation, because it is done during the condition period rather than before registration. What it buys you is a file in which your client’s acceptance was informed — and a client who does not call you in March asking why nobody mentioned the windows. If you want the same discipline applied to registered interests generally, the title clauses in this series cover the mechanics, and a current survey is often what makes a heritage easement legible in the first place.

Questions agents actually ask

Related reading

• Lease Review Conditions on an Investment Purchase: Drafting the Condition Subsequent
• The Power of Sale Clause in Ontario: What Your Buyer Gives Up
• Designated vs Brokerage Representation: The Services Clauses That Define Your Agreement
• Vacant Possession Clauses in Ontario: Getting the Notices Right Before You Promise It
• Deposit Clauses in Ontario: Upon Acceptance, Herewith, and the 24-Hour Trap
• Every clause and condition guide in one place

This is professional commentary from a Broker of Record on drafting and disclosure practice, not legal advice. What a heritage designation permits or prohibits on a specific property is a matter for the municipality and for the client’s own lawyer. This is general professional commentary from a Broker of Record on drafting practice. It is not legal advice, it is not a substitute for your own brokerage’s policies, and it does not create any professional relationship. Clause codes refer to OREA’s Guidelines for Residential and Commercial Clauses, an OREA member resource — the clause wording itself is OREA’s and is not reproduced here. Always work from your brokerage’s approved forms, and send your client to a lawyer for anything turning on interpretation, enforceability or remedy. Legislation, regulator guidance and case law all change; verify anything you are relying on.