noun
repair work; renovation work
Refers to construction or engineering work to repair, renovate, or upgrade existing structures, facilities, or infrastructure.
橋の改修工事は来月から始まる。
Repair work on the bridge will start next month.
この建物は改修工事中です。
This building is undergoing renovation work.
Compound of 改修 (かいしゅう, 'repair, renovation') and 工事 (こうじ, 'construction work').