The phrase "restoration work" refers to the process of repairing, renovating, or bringing something back to its original condition or state. Full definition
The town was hit by bad floods in 1993 and required restoration work on many of its buildings. (greatrail.com)
The artist has used bricks that were recovered from the original Victorian building during recent restoration work in order to provide a specific connection between the gallery and the outdoor space. (artfund.org)
Recent restoration works have preserved the original appearance and a precious collection of the tower findings are on display in the hotel's private museum. (breakingtravelnews.com)