(1) No deviation from the sanctioned plan shall be made during erection or execution of any work.
(2) Notwithstanding anything contained in sub-rule (1),—
(a) if during erection or execution of work any internal alteration within the sanctioned covered space which does not violate the provisions of the Act or these rules is intended to be made, the person referred to in sub-rule (1) of rule 11 shall inform the Board of Councillors by notice in writing along with a certificate from the Architect or the Licensed Building Surveyor, as the case may be, together with drawings incorporating the deviations and structural calculation in case of structural deviations, stating the nature and purpose of such deviations at least fifteen days prior to carrying out such erection or execution of work, and may proceed with the execution of such work subject to the condition that such deviations shall be incorporated in the 'Completion Plan' under rule 33;
20 THE KOLKATA GAZETTE, EXTRAORDINARY, FEBRUARY 14, 2007 [PART I
(b) if during the erection or execution of work any external deviation beyond the sanctioned covered space , either horizontal or vertical or both, is intended to be made and which does not violate the provisions of the Act or these rules, the person referred to sub rule (1) of rule 11 shall, prior to carrying out such erection or execution of works, submit, in accordance with the provisions of these rules, a revised plan incorporating the deviations intended to be carried out, for obtaining necessary sanction therefor;
(c) if total sanctioned building is intended to be shifted as a whole within the periphery of the boundary keeping mandatory open space within the rule, this can be permitted with prior notice to the Municipal Authority with a revised plan. After serving such notice the owners may be allowed to proceed with the work unless there is any objection from the end of the Municipal Authority within 15 days.