We are in the process of purchasing a plot of land with a 'barn' which we would like to convert to living accomodation. However, it has come to light that the building was originally a farm house and has been used as a barn for some years. We would like to return it to a home. Without adding any extensions to the existing building, would a Permis de Construire suffice to restore the property. We are in 50, St Hiliare de Harcouet