All applications for building permits shall be accompanied by a drawing or plat, in triplicate, showing the lot plan, the location of the building on the lot, accurate dimensions of building and lot and such other information as may be necessary to provide for the enforcement of these regulations. This plat shall be prepared after the lot has been staked by a licensed surveyor. A careful record of the original copy of such application and plats shall be kept in the office of the building inspector and a duplicate copy shall be at the building at all times during construction.