Can one of the dual owners borrow money on the home without the other owners signing?

In general, if two individuals are co-owners of a property, one owner cannot unilaterally borrow against the home without the consent of the other owner. Most lenders require all owners to sign the mortgage documents, as all owners have a legal interest in the property. However, specific circumstances can vary based on local laws and the terms of ownership, so it's advisable to consult a legal professional for guidance.