Can a landlord have an unlicensed person do major repair work?

Location: Orange County NY Dealing with "scumlord". We demanded repairs be made due to water leaking through our cealing from an upstairs unit's faulty shower stall and to the rotting pine kitchen floor. Landlord failed to respond except to tell us that if we don't like the place then... show more Location: Orange County NY
Dealing with "scumlord".
We demanded repairs be made due to water leaking through our cealing from an upstairs unit's faulty shower stall and to the rotting pine kitchen floor.
Landlord failed to respond except to tell us that if we don't like the place then leave.
We contacted the code enforcement officer and had them come out to verify that it was becoming a hazard. Mind you the building has had outstanding code violations for over a year now that the landlord refused to fix but the town hasn't done anything to him yet.
Now through a 2nd party we are hearing that the landlord is having his friend come install a new shower to save him money from paying the Licensed Plumber.

Can this landlord have his friend who is not a licensed plumber install the shower? It was my understanding that in the State of New York the only unlicensed persons who could do work on a house are those who reside there.
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