What does 'repair' refer to in terms of building maintenance?

In the context of building maintenance, 'repair' specifically refers to work performed to restore a damaged portion of a structure. This definition encompasses actions taken to fix something that is broken or deteriorated, ensuring that the building functions as intended and maintains safety and integrity. Repair work might include fixing leaks, replacing broken windows, or patching up damaged walls, enabling the overall structure to perform its intended use without needing a complete overhaul or new construction.

The other options involve changes or improvements to a building that go beyond mere repairs. For example, modifications for aesthetic purposes do not necessarily address functionality or damage, while a complete overhaul implies a comprehensive renovation of systems or features rather than just rectifying specific issues. Similarly, new construction aimed at enhancing design indicates the addition of new elements without the context of fixing existing damage. Thus, focusing on the restoration aspect makes B the accurate choice in defining 'repair' within building maintenance.