Homes subject to the previous law are not subject to any restrictions on residential use; existing or future restrictions on use under the cantonal or communal law are reserved.
Such homes may be renovated, converted, or demolished and rebuilt without any requirement to impose restrictions on use under Article 7 paragraph 1. Within building zones, the main useable area may be extended by a maximum of 30 per cent of the main usable area existing on 11 March 2012. Within these limits, additional homes and buildings may be created.4
If the extension of an existing home exceeds the area mentioned in the second sentence of paragraph 2, the extension shall be permitted provided the home is declared to be a principal home as defined in Article 7 paragraph 1 letter a or a home intended as managed tourist accommodation as defined in Article 7 paragraph 1 letter b in conjunction with Article 7 paragraph 2 letter a or b and the relevant authorisation requirements are met. The building authority shall order a corresponding restriction on use in the building permit and instruct the land registry to note the restriction on use in the land register as soon as the building permit becomes legally effective.5
The foregoing is subject to any other requirements of federal and cantonal law. Outside building zones, the permissibility of changes to structure and use shall be determined in accordance with the provisions of the spatial planning legislation.6