Building permit

a. No structure shall be erected, moved, added to or structurally altered without a building permit therefor, issued by the building official. No building permit shall be issued except in conformity with the provisions of this ordinance, except those for which a building permit was obtained following a written order from the zoning board of review.

b. If the work or use described in any building permit has not been initiated within 180 days from the date of issuance thereof, said permit shall expire.

c. If the work described in any building permit has not been completed within two years of the date of issuance thereof, said permit shall expire, provided, however, that the board may, upon application and for cause shown, grant an extension, provided that not more than one such extension for a period of one year be granted.