What should I do if I need a signature to apply for a loan to buy a house and find that there is something wrong with the contract? To buy a house and apply for a loan, one person needs to sign it. If there is a problem with the contract, you can remedy it in time and resubmit the application. If the house purchase loan has not been approved, it needs another person's signature to find out that there is something wrong with the contract, which belongs to incomplete or incorrect information. You can provide accurate and perfect information quickly and resubmit the application after timely remedy. Buying a house by loan means that the buyer applies for a loan from the bank with the building in the house transaction as collateral to pay for the house purchase.