There are several factors that determine how long it takes to close a house. If you are paying cash, it can be done in as little as ten days, if the title is clear. If you are using a mortgage, the lender really determines the closing date, regardless of other factors. Most can close in 30 to 45 days, but some lenders and programs add additional steps to the process. When speaking with a lender, ask how soon they are able to close, and if using a specific loan product ask how that will impact the closing date.