Generally speaking, renovation consists in creating something new. The work usually implies the removal of the old building to build a new one. This applies to all types of buildings.
Restoration is not the same as renovation. Restoration requires ensuring that the original features of the building are preserved. This means that the work is intended to renovate, repair or modernise the building and put it back to its original state. The architectural concept and the intent of the construction are retained down to the smallest detail. For example, when one side of a wall is rebuilt, the result must match the original one, but in better condition. Restoration usually applies to historical and/or listed buildings like churches, castles, houses, museums, etc.