Renovation (ristrutturazione) means the repair of damages which are a result from normal wear and tear. In other words, we are talking about repair works.
When it comes to listed buildings we do not talk about renovation but restoration (restauro), something only especially trained experts may carry out!
Preservation (risanamento conservativo) is much more than renovation and can include interferences with the fabric of the building. Preservation means the structural and/or technical reconstruction of a property, the modernization, the improvement of the standard of living or of the adaptability of utilization.