renovation — to restore to good condition; make new or as if new again; repair.
facelift — Also, face lifting, facelifting. plastic surgery on the face for elevating sagging tissues and eliminating wrinkles and other signs of age; rhytidectomy.
improvement — an act of improving or the state of being improved.
modernization — to make modern; give a new or modern character or appearance to: to modernize one's ideas; to modernize a kitchen.
refurbishment — to furbish again; renovate; brighten: to refurbish the lobby.
rejuvenation — to make young again; restore to youthful vigor, appearance, etc.: That vacation has certainly rejuvenated him.