"unauthorized building" is a correct and usable phrase in written English.
It refers to a building or structure that has been constructed without proper permission or approval from the relevant authorities. Example: The government has ordered the demolition of several unauthorized buildings that were constructed in a protected forest area.
Residents say the Lebanese Army, which has a checkpoint at the camp's entrance, sometimes searches cars to make sure no unauthorized building materials enter, so the camp does not become more permanent.
On the pretext of Martino's unauthorized building of a new fortress on the island, the emperor sent him a letter in which he ordered him to cease construction, and to present himself in Constantinople in the next year in order to renew the island's lease.
People simply occupied land and began to build houses for themselves; there are now about 20,000 unauthorized buildings in seven neighborhoods that need to be regulated.
Mrs. Helmsley's problems in Sleepy Hollow began last summer, when officials from the local building department noticed unauthorized construction in the cemetery.
At each of the houses, inspectors said, they found locked bedrooms, unauthorized construction work and alterations, and many building-code violations.
New suburbanites were building unauthorized homes much like the inner-city hovels from which the state had evicted them.
As a result, the city has halted work on what it says was an unauthorized extension to the building.
Karen Copeland, a Manhattan lawyer who frequently represents tenants facing eviction because of pets, said that the recent ruling makes sense and that it clarifies the requirements of the Pet Law as to when an owner or managing agent is deemed to have notice of an unauthorized pet in a building.
The U.S. Army Corps of Engineers ordered protesters to leave the camp by Monday, citing the building of unauthorized permanent structures on federal land.
He said he would ban Muslims from the country or perhaps create a registry of them, along with making a quick fix of the complicated unauthorized immigration problem by building a massive border wall.
Referred to in Israel as "price-tag attacks" — exacting a "heavy price" in retaliation for a perceived wrong — such offenses have usually been carried out in what the attackers say are reprisals for Palestinian violence against Israelis or government curbs on unauthorized West Bank settlement building.
