Many people believe that drawing up a prenup is an incredibly expensive process. However, this is simply not the case. The average range for prenuptial agreements is only $1,200 to $2,400. Although, this applies for couples whose finances are more straightforward. As with many other types of expenses, the cost of a prenup depends largely on where you live. Additionally, other factors that affect the cost include what you include in the prenup, how contentious the negotiations are, and the lawyer you hire.