4.1 Contract Types and Required Elements
Key Takeaways
- A valid contract requires offer and acceptance, consideration, legal capacity, lawful object, and mutual consent.
- Express vs. implied and bilateral vs. unilateral classifications change how acceptance and performance work.
- The Statute of Frauds requires most real estate contracts to be in writing and signed to be enforceable.
- Void, voidable, and unenforceable describe different defects with very different exam answers.
Contract Types and Required Elements
A contract is a legally enforceable promise. On the national real estate exam, nearly every contract question reduces to one of two issues: does a valid contract exist, and what kind of contract is it. Master the essentials first, then the classifications.
The five essential elements
Every valid contract must contain all five elements below. Drop one and the agreement is defective.
| Element | Plain meaning | Exam trap |
|---|---|---|
| Offer and acceptance (mutual assent) | A definite offer accepted on its exact terms | A counteroffer rejects the original offer |
| Consideration | Something of legal value exchanged | A bare promise to make a gift is not consideration |
| Legal capacity | Parties of legal age and sound mind | A minor's contract is voidable by the minor |
| Lawful object | Legal purpose | A contract to do something illegal is void |
| Mutual consent (reality of consent) | Genuine agreement, free of fraud or duress | Fraud or undue influence makes it voidable |
Note that consideration need not be money; a promise for a promise (mutual promises) satisfies it in a bilateral contract.
Express vs. implied
An express contract is stated in words, oral or written. An implied contract is created by the conduct of the parties. A listing agreement signed by a seller is express; tipping a closing into existence by accepting services can imply obligations.
Bilateral vs. unilateral
This distinction is heavily tested.
- A bilateral contract is a promise for a promise. Both parties are obligated when they sign. A purchase agreement is bilateral: the buyer promises to buy, the seller promises to sell.
- A unilateral contract is a promise in exchange for an act. Only one party is obligated unless and until the other performs. An open listing or a reward offer is unilateral.
Worked example
A seller offers a $3,000 bonus to any agent who brings a full-price cash buyer within 30 days. This is a unilateral offer. No agent is obligated to act. The seller becomes obligated only when an agent actually delivers a full-price cash buyer (the act). If the agent stops at a non-cash buyer, no contract is formed and no bonus is owed.
The Statute of Frauds
The Statute of Frauds requires certain contracts to be in writing and signed by the party to be charged. For real estate this includes contracts for the sale of real property, leases longer than one year (commonly), and certain listing agreements. An oral contract to sell land is generally unenforceable even though all five essential elements exist.
Validity categories
| Category | Definition | Example |
|---|---|---|
| Valid | Meets all requirements, fully enforceable | Properly signed purchase agreement |
| Void | No legal effect from the start | Contract for an illegal purpose |
| Voidable | Valid until a party elects to cancel | Contract signed by a minor |
| Unenforceable | Valid but no remedy in court | Oral land-sale contract (Statute of Frauds) |
The difference between void and voidable is the single most missed concept here. Void means it never existed; voidable means one party has the power to rescind but may also choose to honor it.
A seller promises to pay a $2,500 bonus to whichever cooperating agent first produces a ready, willing, and able full-price buyer. What type of contract is this offer?
Two parties orally agree on the sale of a vacant lot, fully agreeing on price and terms. Neither has signed anything. How is this agreement best described?
Executed vs. executory and the parol evidence rule
Two more classifications round out contract questions. An executory contract is one where something remains to be done — a signed purchase agreement before closing is executory. An executed contract is one where both parties have fully performed — after closing, the same agreement is executed. The exam exploits the word's double meaning: "executed" can also mean simply signed, so read context.
The parol evidence rule bars a party from using prior oral statements to contradict the terms of a complete written contract. If the signed purchase agreement says the refrigerator does not convey, a buyer cannot enforce the seller's earlier verbal promise that it would.
Worked example: void vs. voidable
A 16-year-old signs a contract to buy a car-detailing franchise's commercial unit. Because a minor lacks legal capacity, the contract is voidable at the minor's option — the minor may disaffirm it, but the adult party cannot. Contrast a contract to launder drug proceeds through a property purchase: that has an unlawful object and is void from the outset, enforceable by no one.
| Defect | Result | Who can escape |
|---|---|---|
| Minor / incapacity | Voidable | The protected party only |
| Illegal purpose | Void | No one (never valid) |
| No writing (land sale) | Unenforceable | Either party can raise it |
This three-way distinction — voidable, void, unenforceable — is the single most repeated contract concept on the national exam.
Reality of consent: the defects that void or void-able a deal
Even when offer, acceptance, consideration, capacity, and legal purpose are present, the agreement fails if genuine assent is absent. The exam tests five consent defects, and each maps to a specific outcome.
| Defect | What happens | Result |
|---|---|---|
| Fraud | Intentional misstatement of material fact relied upon | Voidable by the victim (or void in extreme cases) |
| Negligent misrepresentation | Careless false statement | Voidable; possible damages |
| Mistake (mutual) | Both parties wrong about a basic fact | Voidable / rescindable |
| Duress | Agreement forced by threat | Voidable by the coerced party |
| Undue influence | Domination of a vulnerable party | Voidable by the victim |
A unilateral mistake (only one party is wrong) usually does not allow escape unless the other party knew of and exploited the error. The recurring exam pattern: a seller's agent knowingly conceals a flooded basement, the buyer signs, and later discovers it — that is fraud/concealment, so the contract is voidable by the buyer, who may rescind and recover the deposit. Knowing whether a defect produces a void result (no contract ever) or merely a voidable one (the wronged party chooses) is the highest-frequency point in this entire topic.