Whether a listing agreement is a unilateral or bilateral contract depends on which kind you sign. An exclusive right-to-sell and an exclusive agency listing are both bilateral contracts: you and the broker each take on enforceable obligations the moment you sign. An open listing is a unilateral contract, where the broker earns a commission only by actually producing a buyer and owes you nothing before that happens. The classification is not academic. It controls what the broker owes you, what you owe the broker, and what happens if either of you tries to walk away.
Bilateral and Unilateral in Plain Terms
In a bilateral contract, both parties exchange promises, and both are bound as soon as the agreement is signed. Each side has something it must do, whether or not performance has started.
A unilateral contract works differently. One party makes a promise, but the other side is not required to do anything. The contract is fulfilled only when someone performs a specific act. A reward offer is the standard illustration: the person offering money for a lost dog owes nothing until someone actually returns the dog, and no one is obligated to go looking.
That split maps directly onto listing agreements, because each type sets up a different relationship between seller and broker.
Which Listing Types Are Bilateral and Which Are Unilateral
Exclusive Right-to-Sell: Bilateral
The exclusive right-to-sell is the most common listing agreement in residential sales, and it is bilateral. The broker agrees to actively market the property and use reasonable efforts to find a buyer. You agree to pay the broker’s commission if the property sells during the listing period, no matter who finds the buyer. Sell to your neighbor without the broker’s help, and the commission is still owed.
That structure gives the broker the strongest reason to invest in marketing, because the commission is protected. It also means the broker has a binding duty to perform, not a casual understanding to try.
Exclusive Agency: Bilateral
An exclusive agency listing is also bilateral, with one carve-out. The broker still promises to market the property, and you still grant exclusivity to that one broker. But you keep the right to find a buyer yourself. If you sell the property on your own without any involvement from the broker or another agent, no commission is owed.
If any licensed agent is the procuring cause of the sale, the listed broker earns the commission. Procuring cause means the person whose efforts set in motion an unbroken chain of events leading to the sale. It is not always whoever first showed the property; it is whoever was most responsible for the deal actually closing.
Open Listing: Unilateral
An open listing is unilateral. You promise to pay a commission to whichever broker produces a buyer, and no broker promises anything in return. There is no obligation to market the property, hold open houses, or make any effort at all. The contract is fulfilled only when a broker delivers a ready, willing, and able buyer who completes the purchase.1Legal Information Institute. Ready, Willing, and Able
Because no broker has an exclusive claim, you can sign open listings with several brokers at once. The trade-off is that brokers invest less effort when there is no guaranteed payoff. Open listings are uncommon in residential sales for that reason and show up more often in commercial deals or where the seller already has a strong network of potential buyers.
What the Classification Changes for You
The unilateral-versus-bilateral label controls three things that hit your wallet directly.
It determines what the broker owes you. Under a bilateral listing, the broker has a binding obligation to use reasonable efforts. If they sign your listing and then do nothing, you have a breach-of-contract claim. Under an open listing, the broker owes you nothing until they choose to act. You cannot sue a broker for failing to market your home under an open listing, because they never promised to.
It determines what you owe the broker. Under an exclusive right-to-sell, your commission obligation exists even if the broker had nothing to do with finding the buyer. Under an exclusive agency listing, you owe a commission if any agent was the procuring cause. Under an open listing, you owe nothing unless a specific broker produces the buyer.
It also affects how easily you can walk away. Canceling a bilateral contract has real consequences because both sides already have obligations in place. Canceling a unilateral contract is simpler in some respects, since the broker has not committed to anything. But if a broker has already procured a buyer, you still owe the commission.
Fiduciary Duties That Come With a Bilateral Listing
When a broker signs a bilateral listing agreement, they become your agent and take on fiduciary duties. These are legally enforceable obligations, not professional courtesies. A broker acting as your agent generally owes you:
- Loyalty: the broker must put your interests ahead of their own, even when that means steering you toward a lower-commission outcome.
- Disclosure: the broker must tell you about anything that could affect your decision, including competing offers, known property issues, and market conditions.
- Confidentiality: your financial situation, your motivation for selling, and your negotiating position stay private.
- Reasonable care: the broker must provide competent guidance, stay current on market conditions, and handle paperwork properly.
- Obedience: the broker must follow your lawful instructions, such as rejecting offers below a set price.
- Accounting: the broker must track all money that passes through their hands, including earnest money deposits.
Under an open listing, these duties are weaker or absent, because the broker is not your exclusive agent. The relationship is closer to an independent contractor working on spec.
Canceling a Bilateral Listing Early
Because exclusive right-to-sell and exclusive agency listings are bilateral, walking away is not as simple as changing your mind.
If a seller cancels an exclusive right-to-sell before it expires, the broker may be entitled to the full commission as liquidated damages. Many listing agreements include a liquidated damages clause for this exact scenario. Whether it holds up depends on whether the pre-agreed amount reasonably reflects the broker’s expected losses and whether both parties understood the terms at signing.
Some brokerages will negotiate a release, especially if the relationship has broken down. But the broker has no obligation to let you out. A bilateral contract means you made a promise, and promises in real estate are enforceable.
You also have leverage in some situations. If the broker failed to market the property, missed deadlines, or otherwise did not hold up their end of the bilateral agreement, you may have grounds to terminate for cause. The broker’s breach can void your obligations, including the commission. Some agreements include an early termination clause with a specific cancellation fee, which is worth reading closely before you sign.
The Protection Clause: A Bilateral Obligation That Outlives the Listing
Almost every bilateral listing agreement includes a protection clause, sometimes called a safety clause or tail provision. This is the part that catches sellers off guard.
If a buyer who was introduced to your property during the listing period comes back and purchases the property after the agreement expires, you still owe the broker a commission. The typical window runs 30 to 45 days after the listing expires, though it is negotiable and some agreements push it longer.
For the clause to apply, most agreements require the broker to deliver a written list of prospective buyers’ names shortly after the listing expires. If a buyer on that list purchases the property during the protection window, the commission is owed. The clause typically becomes void if you sign a new exclusive listing with a different broker, because the new agreement supersedes the old one.
When you negotiate a listing agreement, pay attention to two things: the length of the protection period, and whether you can include an exclusion list of buyers you were already in contact with before hiring the broker. That exclusion list prevents you from owing a commission on a sale you set up yourself before the broker got involved.
Net Listings
One arrangement sits outside the three standard types and deserves a quick flag. In a net listing, you set a minimum price you want to receive, and the broker keeps anything above that amount as their commission. Sell at $350,000 against a net price of $320,000, and the broker pockets $30,000. Sell at $321,000, and the broker earns $1,000.
Net listings are illegal in the vast majority of states because of the conflict of interest built into them: the broker both benefits from a higher sale price and controls the information flow about market value. Only a handful of states still permit them. If someone proposes a net listing, know that the arrangement is banned in most of the country.