(1) At any time after a housing or improvement scheme has come into force and before it has been fully executed, the Board may for reasons to be recorded alter or cancel it: Provided that-
(a) if any alteration is likely to increase the estimated cost of executing a scheme by more than ten percent or if any altered scheme is estimated to cost more than twenty lakhs of rupees, the alteration shall not be made without the previous sanction of the Government;
(b) before making any alteration which involves acquisition, otherwise than by agreement, of building not proposed to be acquired in the original scheme, or owing to which any land not previously liable under the scheme to payment of betterment fee becomes liable to such payment, the Board shall serve a notice, in such form, on such persons or classes of persons and in such manner, as may be prescribed, of classes of persons and in such manner, as may be prescribed, of the proposed alteration, and consider the objections, if any, received in pursuance of the notice within thirty days from the service of the notice or within such further time as the Board may, for sufficient cause, allow, and give an opportunity of being heard to the objectors;
(c) no scheme estimated to cost over twenty lakhs of rupees shall be altered or cancelled without the previous sanction of the State Government.
(2) any alteration or cancellation of a scheme under sub-section(1) shall be notified in the Gazette and have effect from the date of such notification, so however, that any such modification shall be without prejudice to the validity of anything previously done under the original scheme.