repair work; renovation work
Refers to construction or engineering work to repair, renovate, or upgrade existing structures, facilities, or infrastructure.
Repair work on the bridge will start next month.
This building is undergoing renovation work.
修理工事 is more general repair work, while 改修工事 often implies larger-scale renovation or improvement, not just fixing.
改築工事 involves structural alteration or rebuilding, whereas 改修工事 focuses on repairing or upgrading without necessarily changing the basic structure.
Compound of 改修 (かいしゅう, 'repair, renovation') and 工事 (こうじ, 'construction work').