Section 239(1)(c) in The New Delhi Municipal Council Act, 1994
(c)to make any alteration or repairs to a frame building involving the removal or re- erection of more than one-half of the columns or posts in any such wall thereof as aforesaid; or involving the removal or re-erection of any such wall thereof as aforesaid to an extent exceeding one-half of such wall above plinth level, such half to be measured in superficial metres;