Recovery of Repairs from members of unregistered building.

Is there any registered residents welfare association / managing committee functioning for and on behalf of 30 members / occupants ?

Since the society is unregistered, nobody can be legally forced to contribute and no amount can be legally recovered from them. 

What is the nature of repairs proposed? Is such repairs possible without the willing consent of the "other" members?

To begin with, I really appreciate your time and query raise by you all. 

I hereby reply to your queries as follows : 

Dr J C Vashista :  No sir, there is no registered residents welfare associations  and as it is unregistered building, it does not have managing committee yet.

In this case there is no association / MC to ask for any money, any demand raised is illegal.