改修

1. Origins, structure, and basic meaning

• Structure: 改修, read かいしゅう, combines alteration 改 with repair 修 as a term for improving an existing facility.
• Basic usage: It means repairing or updating an existing facility to improve its function, as in 体育館を改修する.

2. Common pitfalls and similar expressions

• Scope and context
  • Unlike 新築, it presupposes an existing structure and involves more substantial work than ordinary cleaning.