Plenty of buyers are also sellers. They have found the home they want, but their money is still locked in the one they own — and few people can comfortably carry two mortgages. The answer is an offer subject to sale: a bid that only becomes binding once the buyer has sold their existing property. It is one of the most common conditions an agent will draft, and one of the most delicate to get accepted. This guide explains exactly what a subject-to-sale offer is, why sellers hesitate over one, how a buyer's agent can make it competitive, and how a listing agent should weigh one against cleaner bids — with a worked example you can reuse on your next chain.
A subject-to-sale offer is a purchase offer with one overriding condition written into it: the buyer will complete only if they first sell their own home. If that sale does not happen within an agreed period, the buyer can walk away without forfeiting their deposit or facing penalty. It sits alongside the other conditions a buyer can attach — financing, inspection, valuation — but it is a different animal, because it depends not on the buyer's own diligence but on a third party buying the buyer's property. That is what makes it a “chain”: two, three or more transactions linked so that each can only complete when the one behind it does. Understand it as one member of the wider family of contingencies a buyer can use, and the specific risk it carries becomes clear.
Why sellers hesitate
For a seller, accepting a subject-to-sale offer means taking their home off the market on the strength of a sale that has not yet happened. Their money, their onward move and their timeline all now hinge on a buyer they have never met purchasing a property they have never seen. If that sale stalls — a survey falls through, a mortgage is declined, the buyer's buyer pulls out — the whole chain freezes, and the seller has lost weeks of marketing momentum with nothing to show for it. Even when it completes, it is usually slower and less predictable than a straightforward sale. So a subject-to-sale offer starts at a disadvantage: to a seller comparing bids, it reads as more money maybe, later, if a stranger's sale goes through — against a clean offer of cash-in-hand certainty now. That is the gap the buyer's side has to close.
Subject to sale, sold subject to contract, settlement contingency
The terminology trips people up, so it is worth separating three phrases. Subject to sale is the buyer's condition described above — their purchase depends on selling their own home. Sold subject to contract (SSTC) means a seller has accepted an offer but contracts are not yet exchanged; it describes a stage, not a condition. And a sale-of-home or settlement contingency is the US term for the same mechanism as subject to sale. The words differ by market — the UK, Australia and New Zealand say “subject to sale”; the US says “contingent on the sale of the buyer's home” — but the substance is one thing: a purchase that cannot complete until another property changes hands. Getting the label right matters, because the standard time limits and protections attached to each vary by jurisdiction.
How a buyer's agent makes it competitive
The whole game is to shrink the uncertainty the condition creates. The single biggest lever is the state of the buyer's own sale: an offer subject to sale of a home that is already under offer is worlds apart from one where the buyer has not even listed. So the first move is always to get the client's property on the market — ideally already sold subject to contract — before bidding. From there, the levers stack: price the offer realistically rather than leaning on the condition to excuse a low number; put down a strong deposit; keep the onward chain short and be able to describe it; and, crucially, attach a firm time limit to the condition so the seller sees a defined end date rather than an open-ended wait. Each of these reads to the seller as risk removed. The closer you get the offer to behaving like an unconditional one, the more the price is allowed to speak — the same logic that governs winning any competitive bid.
How a listing agent should weigh one
On the other side of the table, an agent advising a seller has to price the uncertainty rather than simply reject it. The questions that matter are concrete: Is the buyer's home listed, and at a realistic price? Is it already under offer, and how solid is that offer? How long is the chain behind them? What time limit is on the condition, and is there a kick-out clause letting the seller keep marketing and give the first buyer a short window to go unconditional if a better offer arrives? A subject-to-sale offer at a strong price, from a buyer already under offer, with a two-week condition and a kick-out clause, may be worth accepting over a lower clean bid. The same condition from a buyer who has not listed is closer to a reservation than an offer. This is exactly the kind of trade-off that comes up when you handle multiple offers — the job is to compare certainty, not just headline price.
A worked example
Suppose a seller has a home on at €500,000 and two offers on the table. Buyer A offers €490,000, no conditions, ready to proceed. Buyer B offers the full €500,000 but subject to sale of their own flat. On price alone, B wins by €10,000. But look closer. If Buyer B has not yet listed, the seller is being asked to gamble €500,000-maybe against €490,000-certain, with no end date — most agents would advise taking A. Now change one fact: Buyer B's flat is already sold subject to contract, the chain below is one link, and B accepts a 14-day time limit plus a kick-out clause. The €10,000 premium now buys a manageable, time-boxed risk with an exit if it stalls — and A's clean offer is still a fallback. The number on the page did not move; what changed was how much of B's uncertainty had been removed. That is what a seller is really being asked to judge, and it is why the offer amount can never be read in isolation from its conditions.
De-risk it with an honest valuation on both homes
Every subject-to-sale decision — on either side — turns on one thing: a credible view of what two properties are actually worth. A buyer's agent cannot promise a realistic timeline without pricing the client's own home to sell, not to sit; a listing agent cannot judge whether Buyer B's chain is sound without a view on the property underneath it. Entering an address into Biedradar returns comparable sales, a valuation range and market signals in minutes, so you can price the onward home to move and gauge how solid the sale propping up a subject-to-sale offer really is. You can also hand your client a branded property analysis report that shows, in writing, why the number is what it is — turning “it should sell around here” into evidence the other side can trust. The judgement about accepting or making the offer stays yours; the hours of assembling the comps disappear, and protecting the deal from a late higher bid — the risk covered in our guide on gazumping and how to avoid it — starts with getting that price right.
Frequently asked questions
What does 'subject to sale' mean on a property offer?
A subject-to-sale offer is one where the buyer's purchase depends on them first selling their own home. The condition is written into the offer: if the buyer's property does not sell within an agreed period, they can withdraw without penalty. It lets someone commit to a new home before their existing one has completed, but it hands the seller uncertainty, because the deal now rests on a second sale the seller does not control.
Is a subject-to-sale offer weaker than a regular offer?
Yes, all else equal. The seller is being asked to take their home off the market on the strength of a sale that has not happened yet. That introduces chain risk and a slower, less certain timeline. A subject-to-sale offer can still win — if the price, deposit and the buyer's own sale position are strong enough to outweigh the added uncertainty — but a comparable offer with no such condition will almost always be preferred.
How can a buyer make a subject-to-sale offer more competitive?
Get your own home on the market — ideally already under offer — before you bid, so the condition is a formality rather than an open question. Price your bid realistically, offer a solid deposit, keep your onward chain short, and put a firm time limit on the condition so the seller sees an end date. The more of the sale you have already de-risked, the closer your offer reads to an unconditional one.
What is the difference between subject to sale and a settlement contingency?
They describe the same idea in different markets. 'Subject to sale' (common in the UK, Australia and New Zealand) and a 'sale-of-home' or 'settlement' contingency (common in the US) both make the purchase conditional on the buyer disposing of their existing property. The wording, the standard time limits and mechanisms such as a kick-out clause differ by jurisdiction, but the underlying risk to the seller — a deal that depends on another sale — is identical.
Can a seller keep marketing the property after accepting a subject-to-sale offer?
Often, yes. Many sellers accept subject to sale but insist on a kick-out (or '48-hour') clause: they continue to market the home, and if a stronger offer arrives, the first buyer gets a short window to remove their condition or step aside. It protects the seller from being trapped in a stalled chain, so buyers making a subject-to-sale offer should expect it and price their own sale timeline accordingly.
