Construction: extensions of buildings for residential use

The dataset has the characteristics of extensions of existing buildings. Extension means the further construction, vertical or horizontal, on a pre-existing building, with expansion of the volume of the same. The data are presented from 2011 onwards, by district and town hall (former decentralisation zone). The characteristics described are whether or not there is cant, the area and volume of the extension; number of dwellings, rooms, accessory rooms and useful area of extension only (in case of extension with new dwellings, acronym CNA); rooms, accessory rooms and useful area of extension only (in case of extension without new dwellings, acronym SNA, i.e. new rooms in existing dwellings); extension area for services outside the dwellings and non-residential area of the extension for productive activities and services. It is also declared whether the permit holder is a natural or legal person. This dataset has been issued by the Municipality of Milan.