If you have excellent credit and qualify for a conventional loan, you’ll need to be able to contribute at least 3 percent of the home’s purchase price to a down payment. If you have subpar credit or you’re looking to borrow a larger amount of money with a jumbo loan, you’ll need more cash — likely at least 10 percent of the purchase price. The down payment isn’t your only cash concern, though. Delaware has the highest closing costs in the country behind Washington, D.C., and you’ll need to cover your portion of that bill as well.