(a) No person shall vary materially from the approved plans and specifications deposited with and approved by the Director of Building and Zoning unless amended plans and specifications showing such proposed alteration or variation are first filed with and approved by the said Director.
(b) In the event such variation involves an increase in the total cost of the work a statement to this effect shall be made and the necessary additional fees shall be paid. (1963 Code § 22.108)