Section 15(1)(b) in The West Bengal Housing Board Act, 1972
(b)any contract involving an expenditure up to [rupees fifty thousand] [Words Substituted for the words 'rupees twenty thousand' by W.B. Act 40 of 1976.] may, in case of urgency, be made by the Chairman without the previous sanction of the Board but shall be referred to the Board at the earliest opportunity..