Your cost depends on the size and complexity of your bridge mortgage request, and also the number of days you need this temporary financing. Assuming you are not sourcing the bridge mortgage from a private lender, an average home buyer typically spends $1,000 to $3,000 all-in. The major banks do not typically charge a setup fee, while other lenders may. And you may incur some legal fees to register the bridge mortgage. For every $100,000 you bridge, the monthly interest will be between $535 and $600.