Renovations refer to interventions carried out in existing buildings, but they shouldn't be confused with extraordinary maintenance works, which are useful for renewing and replacing even structural parts of buildings without altering the overall volume.
The works included in building renovations range from the restoration or replacement of certain constituent elements of the building to the removal, modification, or installation of new systems; from demolition and reconstruction with the same volume as the existing property to the interventions necessary to restore buildings or parts of them.