Lenders let you borrow against home equity up to a combined loan-to-value ratio, typically 80–85%. So on a $480,000 home, a lender allowing 85% CLTV would let total debt reach about $408,000 — if you owe $310,000, that's roughly $98,000 of borrowable equity through a home equity loan or line of credit.
Borrowing against your home can be a low-cost way to fund a renovation or consolidate higher-interest debt, since the rate is secured by the property. But that security cuts both ways: your home is the collateral, so failing to repay risks foreclosure. Equity is best treated as a long-term asset and a safety reserve, not a source of routine spending.