This often requires significant structural work, such as removing or adding walls to reconfigure a layout, moving plumbing or electrical systems, or even changing the use of a room (e.g., converting a bedroom into a bathroom or a garage into a home office). Because remodeling involves structural and systems changes, it is typically a larger, more complex, and costlier undertaking that almost always requires building permits and the expertise of various professional trades like architects, engineers, and licensed contractors.