The basic elements required for the agreement to be a legally enforceable contract are: mutual assent, expressed by a valid offer and acceptance; adequate consideration; capacity; and legality.
Valid Offer: The offer must be clear and specific. Acceptance: The offeree must accept the offer without modifications. Adequate Consideration: There must be a fair exchange of value between the parties. Legality: The contract's purpose must be lawful.
There are four essential elements of forming a contract: offer, acceptance, consideration, and intention to create legal relations. Beyond this, the terms of the contract must also be unambiguous, and the parties must have the mental capacity to agree.
The Requirements of an Offer The statement of offer must show intent—The statement must reasonably be interpreted to indicate an intention to enter into a binding agreement. The offer must be communicated to the other party—An agreement cannot exist unless the offer is communicated.
Even after there is an accepted offer, however, neither party is legally obligated to go through with the transaction at this point. Either party can back out of the deal without being in breach of contract.
You can offer to buy a house that's not for sale, but prepare yourself for rejection—or perhaps the owner asking for more than the estimated value of the home. But nothing's stopping you from trying.