During a nightly emergency repair a plumber discovers that the appartment building is in a really bad shape and is about to collapse. He comes into action but the municipal administration and the real estate mafia (who turn out to be connected inseparably) let their own (financial) interests prevail.
"Durak" is of the same year as "Leviathan" (2014, Andret Zvyagintsev) and about the same subject (real estate corruption in Russia). "Durak" is a bit less philosophical but it has a thriller element in the form of the appartment building that can collapse every minute.
In Dutch "Doerak" means "rascal". In Russian "Durak" means "fool". The title of the film says something about the Russian society, because in Western eyes the main charachter of the film is not a fool but a hero. In Russia however, they look different at these things. Not only is the real estate maffia not amused with the actions of the pluber, so are his wife (you bring the family into danger) and the occupants of the appartment building (leave us alone).
The appartment building may be in danger of collapsing, the Russian society has already collapsed in the film, permeated as it is with cynism in all layers of society.
By the way, also in the Western world there are accidents attributable to deferred maintenance. Remember the 2017 fire in the Grenfelltower (England), an appartment building with mainly poor occupants and poor fire safety.