One replaces the first mortgage, two sit behind it. Which is right depends on the existing rate more than on anything else.
An owner with equity and a need for cash has three instruments, and the deciding factor is usually the rate on the loan they already have.
A cash-out refinance replaces the first mortgage entirely. If the existing rate is higher than today's, that is fine. If it is meaningfully lower, refinancing to access equity means giving up the good rate on the whole balance to borrow a fraction of it — which is frequently the most expensive route and the one people take by default.
A home equity line of credit sits behind the first mortgage and leaves it untouched. It is revolving: draw, repay, draw again, with interest only on the drawn balance. Rates are usually variable, there is a draw period followed by a repayment period, and the payment can change substantially when it converts. Good for staged spending — a renovation over months — and for reserves that may not be used.
A home equity loan is also behind the first, but a single lump sum at a fixed rate with a fixed term. Good for a known amount with a known repayment plan.
All three are secured by the home, which is the point that deserves saying out loud: converting unsecured debt into debt secured by the residence changes what is at risk if the plan does not work.
Two practical notes. Closing costs on a line are usually far lower than on a refinance. And a lender's willingness to lend behind an existing mortgage depends on the combined loan-to-value, not just the first.
This article is general information, not legal, tax or financial advice. Rules change and every deal is different — check your own case with a licensed professional.
Alberto Zaltzberg — Adonait · adonait.com