What Is a Backup Offer? The Right "Second in Line" Strategy for Ontario Buyers
The home you loved just got snapped up — but the first deal isn’t certain. A backup offer puts you in the strongest possible second position
What’s a backup offer, and is there still a chance if the home I wanted was snapped up?
Yes there’s a chance — that’s exactly what a backup offer is for. When a seller has already accepted a first offer, you can still submit a “second in line” offer that takes effect automatically if and only if the first deal falls through. The mechanism turns on irrevocability: per Ontario’s OREA contract rules, once a seller accepts a first offer with an irrevocable period, they cannot accept a second offer during that window. So a backup offer is typically structured to be accepted only after the first offer lapses or the contract is terminated. It puts you firmly in second position without having to restart your search.
Sources: OREA standard Agreement of Purchase and Sale and irrevocability practice; Ontario Real Estate Source.
“Arthur, I loved that house and someone snapped it up today — is it completely over?” My answer is often: “Don’t give up yet — the first deal isn’t certain, and we can line up second.” Many buyers don’t know about the backup offer. It isn’t about going head-to-head with someone else; it’s about being first to step in if the first deal collapses. Here’s how it works, the logic of the irrevocable period, and how buyers use it without locking themselves in.
First, understand irrevocability — the key
Every Ontario offer carries an irrevocable period — when you submit, you set a deadline before which you can’t withdraw, and the seller must respond within it or the offer is null and void. Submit at 10 a.m. Thursday with irrevocability to 8 p.m., and the seller has ten hours to decide. The key rule: once a seller accepts a first offer with an irrevocable period, they cannot accept a second offer during that window — protecting the first offer’s validity. The backup offer is built on exactly this mechanism.
How a backup offer works
ℹ️Once a seller accepts a first offer with an irrevocable period, they can’t accept a second one during that window. This rule protects the first buyer and is exactly why a backup offer must be structured to take effect only after the first deal collapses.
Why first contracts fall through
How buyers use a backup without getting locked in
⚠️A backup offer is a binding contract, not a casual place in line. Build in your own exit mechanism — don’t get tied indefinitely to second place and miss other, better-suited homes.
💡 A backup offer isn’t a head-to-head fight — it’s using the rules to stand in the strongest second position. In a hot, multiple-offer market, when the first deal collapses, the buyer holding a backup is often the first — and only — person the seller turns back to. You save the time and energy of restarting your search and renegotiating, and you may land the home you wanted on calmer terms.
Frequently Asked Questions
The home I wanted got snapped up — what can I still do?
Submit a backup offer that takes effect automatically if the first deal collapses. First contracts not uncommonly end because of unmet financing, inspection, or legal-review conditions — and the buyer holding a backup is the first one the seller turns back to.
Can a seller accept my backup offer and the first offer at the same time?
No. Per OREA contract rules, a seller can’t accept a second offer during the first offer’s irrevocable period. So a backup offer is typically structured to be accepted only once the first contract is terminated or collapses.
Will making a backup offer lock me in?
It can, so build in an exit. A backup offer is a binding contract; give it a sensible irrevocable period or exit clause so you aren’t tied to second place indefinitely and forced to miss other homes. Staying in touch with your agent matters.
Does a backup offer have to be priced higher than the first?
Not necessarily. The value of a backup is stepping in, not blindly bidding up. If the first deal collapses, the seller faces a departed buyer and your ready backup — so you can often negotiate on calm, reasonable price and terms.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · GUILD Elite
VP & Branch Manager, Bay Street Group Inc.
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