All decisions and findings of the Board, on appeals or upon application for a variance, shall, after public hearing in all instances, be final administrative decisions and shall be subject to judicial review as by law may be provided.
No order of the Board granting a variance shall be valid for a period longer than six (6) months from the date of such order unless the building permit is obtained within such period and the erection or alteration of a building is started or the use is commenced within such period.