増築 and 改装: adding space and remodeling existing space
Compare 増築 for adding a room or extending a library with 改装 for remodeling a warehouse or store interior. Identify added space and changed existing space in the examples.
Adding space with 増築
増築 (ぞうちく) means an extension or addition. 「家族が増えたので家に一部屋増築した。」 means “As the family grew, we added one room to the house.” One room has already been added to the house.
「図書館の増築工事は来月から始まる。」 means “Construction on the library extension begins next month.” The extension concerns additional library space, with construction beginning next month.
Changing existing space with 改装
改装 (かいそう) means renovation or remodeling. 「古い倉庫を改装して小さな劇場にした。」 means “We remodeled an old warehouse into a small theater.” An existing warehouse was remodeled for use as a small theater.
「店内の改装が終わり営業を再開した。」 means “The interior renovation was completed, and the store reopened.” The store interior renovation was completed, and business resumed.
What is added and what is changed
The room example focuses on space added to the house. The warehouse example focuses on changing existing space for use as a theater.
The names are not distinguished simply by when the work occurs. The examples separately describe a completed room addition, a library extension starting next month, and changes to a warehouse and store interior.
How do the room added with 増築 and the warehouse remodeled with 改装 differ in focus?
Show the answer and why
増築 focuses on space added to the house. 改装 focuses on an existing warehouse changed for use as a theater. The room addition has already happened, unlike the library extension work beginning next month.