unauthorized construction

• 违章建筑

unauthorized construction的用法和样例：

例句

1. This does not include a large number of unauthorized and undocumented housing.
   这还不包括为数不少的违章建筑和无证房屋在内。
2. The work was to be located in the Balkan region where unlicensed construction is a hot issue.
   这个作品本来要在巴尔干地区展出，而违章建筑是巴尔干地区的热点话题。