The amendment of Articles 116, 117 and 118 of the Building Law is necessary, in order to alleviate the bureaucracy that this law has brought. These articles were adopted in order to regulate, to legalise, according to their new interpretation, illegal buildings in Slovenia. According to the new law, most of the previously legally constructed buildings fall into this category. Minor modifications could be carried out under the old law with the notification of the works, but under the new law, precisely because of these functional minor improvements, the building cannot be legalised under the articles. As a result, the legalisation of an existing building (obtaining a certificate of occupancy) falls below the requirements of the Building Act as laid down for new buildings. Existing buildings cannot meet all the new requirements written by the services according to the latest knowledge. The new Building Law should allow for the legalisation and regularisation of older buildings, but with the current articles, this is only an apparent demonstration of the possibilities of procedures that in reality cannot be completed, despite the resources invested.