How a second mortgage ranks behind your first
A second mortgage is a separate loan registered on your home’s title in second position. Your existing first mortgage stays exactly where it is. The order is what matters: if the property is ever sold, whether by you or by a lender enforcing after a default, the first lender is paid out in full before the second lender receives anything. Being second in line is a bigger risk, and that is the main reason a second mortgage costs more than a first.
What links the two loans is combined loan-to-value (CLTV): your first-mortgage balance plus the new second, measured against the appraised value of the home. B-lenders generally cap CLTV around 80%, and some private lenders go to roughly 80–85% on strong files in major markets. As an illustration, on a $700,000 home with a $400,000 first mortgage, an 80% ceiling leaves about $160,000 of room. The appraisal decides the real number, and private lenders often value conservatively.
Your first lender doesn’t have to approve the second, but the second becomes a matter of record on title, and some mortgages have terms about further borrowing. A broker should check your existing commitment before anything is registered.
