A. Every building permit, certificate of appropriateness and approval by the Planning Board or Architectural Review Board shall expire if the work authorized has not commenced within 12 months after the date of issuance or approval or has not been completed within 24 months from such date. If no zoning amendments or other Village regulations affecting the subject property have been enacted in the interim, the Building Inspector shall authorize in writing the extension of the latter period by an additional six months, following which no further work is to be undertaken without a new building permit or approval of the Planning Board or Architectural Review Board.

B. Every variance or special permit shall expire if the work or use authorized has not commenced within 12 months after the date of issuance. In such case, the variance or special permit shall become null and void.