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Illegal construction

Illegal construction is construction work without a valid construction permit. Besides the potential technical hazards on uncontrolled construction sites and in finished buildings, illegal building activity can be a major environmental violation when the works encroach upon preserve areas like nature reserves. Likewise, illegal building can have serious political implications when it is practiced as landgrabbing or for illegal settling in foreign territories.

Notable examples
An infamous example of organized illegal construction can be found in the so-called Sack of Palermo. On the western edge of the Ilola district in Vantaa, Finland, there is an illegal village called Simosenkylä, where the houses are mainly dilapidated, some completely abandoned. ==Environmental risks==
Environmental risks
Increased landslide risk has been found to be associated with illegal building in hillside regions of densely populated urban areas in Italy and Bosnia and Herzegovina, because of loss of stabilizing vegetation by deforestation, etc.. Due to uncontrolled increase in impervious surface, the role of illegal construction has also been discussed in connection with flash floods (see 2011 European floods#Italy). ==Detection==
Detection
In addition to human observation, large-scale screening for illegal building (activity) can also rely on remote sensing technology using satellite imagery (e.g. from EROS B, IRS-P5,...) and geospatial information systems. ==References==
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