All sidewalks, grading and other street improvements hereafter ordered by the city council shall be constructed under the direction and to the satisfaction of the street commissioner, and to correspond to the grade prescribed by ordinance as the established grade of the street so improved, and according to the instructions of the city council. The same rules and regulations shall apply to all street improvements hereafter made, whether ordered by the city council or not. (1983 Code § 12.02.030)