A real estate sales contract is valid when six requirements are all satisfied: both parties genuinely agree to the same terms, each side gives something of value, everyone signing has the legal capacity to do so, the purpose is lawful, the agreement is in writing and signed, and the document contains the essential terms of the deal. Miss any one of these requirements for a valid real estate sales contract and the agreement is either void from the start or vulnerable to being set aside by a court.
Each requirement does distinct work, and the consequences of a gap differ depending on which element is missing. Here is what each one means in a residential transaction.
The Six Required Elements
- Mutual assent between buyer and seller
- Consideration flowing to both sides
- Legal capacity of everyone signing
- A lawful purpose
- A written document that satisfies the Statute of Frauds
- Essential terms, including a proper property description and the purchase price
Most residential contracts layer additional protections on top of these foundations, such as inspection, financing, and appraisal contingencies. Those are not validity requirements. A contract without contingencies is still enforceable; it just leaves the buyer with less room to back out.
Mutual Assent
Every enforceable real estate contract starts with mutual assent, sometimes called a meeting of the minds. The buyer and seller must agree to the same material terms, and that agreement is reached through a formal offer and acceptance. One party proposes specific terms, and the other accepts them without changes.
The offer has to be definite enough that a reasonable person would understand what is being proposed. If the responding party changes any material term, that is not an acceptance. It is a counteroffer, which the original party then has to accept or reject. Residential deals routinely cycle through several rounds of counteroffers before both sides settle. The contract forms only when one party accepts the other’s most recent proposal without modification.
Mutual assent is judged by outward behavior, not private intent. Signing a contract that clearly states a $400,000 price forecloses a later claim that you meant $350,000. Courts look at what was expressed.
Consideration
Consideration is what each party gives up so the deal is a genuine exchange rather than a gift. The buyer gives the purchase price. The seller gives ownership of the property. Both sides must receive something of value.
Consideration does not have to be cash. It can be other property, a promise to perform future work, or anything the parties agree has value. The requirement is that something flows in both directions. A one-sided promise, with nothing coming back, lacks consideration and will not be enforced.
Earnest money typically functions as the buyer’s initial consideration. It is a deposit, usually 1% to 3% of the purchase price, held by a neutral third party like an escrow company or attorney after the contract is signed. Earnest money is not the same as the down payment, which is a larger sum brought to closing; the deposit is normally credited toward the down payment or closing costs at that point. If the deal collapses for a reason a contingency covers, the buyer gets the deposit back. If the buyer walks away without a contractual reason, the seller can keep it as damages.
Legal Capacity
Everyone signing the contract must have the legal ability to do so, meaning they are at least 18 years old and mentally capable of understanding the agreement and its obligations.
A contract signed by someone without capacity is not automatically erased. The distinction between void and voidable matters:
- If a court has already declared the person incompetent before signing, the contract is void from the start and has no legal effect.
- If there was no prior court declaration but the person later shows they could not understand the contract when they signed, the contract is voidable at their option. They can cancel it or let it stand.
- A person under 18 can void a real estate contract while still a minor. If they reach 18 and take no action to cancel, the contract can become binding.
Contracts signed under duress or undue influence are also voidable. A party who was coerced or manipulated into signing can ask a court to set the agreement aside.
A Lawful Purpose
The contract’s purpose must be legal. A sales agreement designed to facilitate illegal activity is void and unenforceable no matter how carefully the document is drafted. The requirement reaches beyond obvious criminal schemes: a contract that requires one party to violate zoning laws, building codes, or similar regulations as a condition of the deal can also be struck down.
In ordinary residential transactions this requirement rarely becomes an issue. It surfaces when properties are sold with conditions attached to their use, or when the structure of the transaction is designed to evade a legal requirement.
A Signed Writing
Real estate contracts must be in writing. The rule comes from the Statute of Frauds, which exists in some form in every state. Property transactions are considered too significant to rest on spoken promises and fading memories.1Legal Information Institute. Statute of Frauds
The document must contain the essential terms of the deal and be signed by the parties who are bound by it. An oral agreement to sell a house, no matter how detailed the conversation or how many witnesses heard it, is not enforceable.1Legal Information Institute. Statute of Frauds
There is a narrow exception. When a buyer has already paid part of the purchase price and either taken possession or made significant improvements, some courts will enforce the agreement despite the lack of a formal writing, on the theory that those actions only make sense if a real agreement existed. Relying on this exception is risky. No buyer should treat a handshake deal as secure.
Essential Terms the Contract Must Contain
A signed writing that is missing key terms can be just as unenforceable as no contract at all. Courts expect certain information to appear in every real estate sales agreement.
Identification of the Parties
The contract must identify the buyer and seller by their full legal names. If a trust, corporation, or LLC is involved, the entity name and the authorized representative should be listed. Ambiguity about who is actually bound can make the contract unenforceable.
Property Description
A street address is not enough. The contract needs a legal description that distinguishes the parcel from every other piece of land. Three formats are common:
- Lot and block, which references a recorded subdivision plat map and identifies the property by its lot number within a specific block.
- Metes and bounds, which uses physical reference points, directions, and distances to trace the boundary lines.
- Fractional designation, which uses a rectangular survey system to identify land by section, township, and range.
A vague or incorrect legal description can void the entire contract. The description is typically pulled from the property’s deed, and getting it right is one of the most important technical details in the document.
Purchase Price and Payment Terms
The agreed price must be stated clearly. Most contracts also specify how the buyer will pay: the earnest money amount, the financing arrangement, the down payment, and the balance due at closing. If the buyer is obtaining a mortgage, the contract should reflect that.
Closing Date
The contract should specify when the transaction will close. In most residential deals the closing date is an approximate target rather than a hard deadline, and either party can usually request a reasonable delay without being in default. If the parties want a firm deadline with real consequences for missing it, the contract needs to say so explicitly.
Signatures
Every party bound by the contract must sign it. If one spouse owns the property as community property or by joint tenancy, both spouses need to sign. The Statute of Frauds specifically requires the signature of the party against whom enforcement is sought, so an unsigned contract is essentially worthless.1Legal Information Institute. Statute of Frauds
Marketable Title Is Implied
Even when a contract does not mention it, the law implies a promise that the seller will deliver marketable title at closing. Marketable title means ownership free from competing claims, unresolved liens, and threats of litigation.2Legal Information Institute. Marketable Title
Things that can make title unmarketable include outstanding mortgages the seller has not paid off, easements the buyer did not know about, boundary disputes with neighbors, adverse possession claims, and zoning violations.2Legal Information Institute. Marketable Title
Most contracts also address title explicitly by requiring the seller to provide a title commitment or abstract early in the process. The buyer then has a set period to review it, raise objections, and require the seller to resolve problems before closing. If the seller cannot deliver clean title, the buyer can walk away and recover the earnest money.
What Happens When a Required Element Is Missing
The practical consequence of a missing requirement depends on which one is gone. No consideration, no lawful purpose, or a signer who was already judicially declared incompetent produces a void contract: it never had legal effect, and neither side can enforce it. A capacity problem without a prior court declaration, or signing under duress, produces a voidable contract: the affected party can cancel it, or can choose to proceed. A missing writing or a missing essential term usually means the contract cannot be enforced in court, even if both sides thought they had a deal.
When the elements are all present and one party then breaches, the non-breaching party has remedies. Specific performance is a court order compelling the breaching party to go through with the sale, and courts are more willing to grant it in real estate than in other contract disputes because every parcel is considered unique. Where the contract sets liquidated damages in advance, the earnest money deposit typically fills that role: a defaulting buyer forfeits it, and a seller who accepts that deposit as liquidated damages is generally limited to that amount. A buyer facing a seller’s breach can also recover costs incurred in reliance on the deal, such as inspection fees, appraisal charges, and loan application costs.