If the house is currently in shared possession and you buy it jointly, it takes at least four signatures before the agreement becomes mandatory. Only then will you be “in the treaty”. If the reason you are withdrawing from the purchase of a home is listed as a contingency case and you make the decision within the eventuality period, you can leave the store. If not, you can lose money and, in rare cases, face lawsuits. You may also have seen sales contracts called the following: Read the contract carefully to find out your options. Most home purchase contracts contain a list of contingencies that must be respected in order for the sale to be concluded, according to the Nolo Legal website.