No, the seller is most definitely NOT required to extend a contract because of the buyer's loan terms. The contract was between the buyer and seller, not the buyer, seller, and a lender; what happens between the buyer and his/her lender(s), the lenders rules or requirements, or what loan(s) he/she chooses to pursue, has NO bearing on the obligation between the seller and buyer. The buyer had to make sure he/she could get the loan or close by when the contract required.Of course, there is one exception: if the contract itself provided that it could be extended by the buyer due to any delay in loans or to meet loan requirements.  A provision like that, if one exists, is enforceable.