To meet the demands of people moving to New Delhi , Mumbai and other large cities for jobs , and due to the unavailability of affordable housing , there are many buildings constructed illegally . The buildings are often created quickly . Some builders neither follow proper building practices and laws , nor execute proper safety measures . Poor construction materials are also to blame in these circumstances . Within the Mumbai region there are estimated to be hundreds of illegal structures that have been built . Sameer Hashmi , BBC reporter , reports that activists " allege that unscrupulous builders often pay hefty bribes to authorities who turn a blind eye to these illegal structures and do not take any action against the builders . " In the wake of the 2013 Thane building collapse that killed 72 people , RT News reported that " ... incidents of this kind are not rare in India , where builders often care more for cutting construction expenses than for the security and quality of the work being done . " In New Delhi in November 2010 , there were 67 people or more killed from the collapse of an apartment building
2013 Thane building collapse
2013 Thane building collapse
Illegal housing in India