Adding an extension to an existing building to increase floor area or rooms; the construction work or the added portion itself.
子どもが増えたので、家を増築して寝室をもう一つ作った。
Because the number of children increased, we extended the house and added another bedroom.
増築の計画を立てる前に、建築士に相談してください。
Please consult an architect before planning an extension.
そのビルは数年前に増築され、会議室が増えた。
The building was expanded a few years ago, and the number of conference rooms increased.