53 Pa. Stat. § 13875
The said Department of Public Works is hereby empowered to charge the cost and expense of the grading, paving, or repaving of said alleys or driveways, and the construction or repair of any retaining walls appurtenant thereto, or part or parts of said alleys or driveways, and/or retaining walls appurtenant thereto, upon the said owners in proportion to the width of their properties abutting thereon, or having the use thereof by deed or otherwise, or actually using the alley or driveway, and/or retaining wall appurtenant thereto, or in any other proportions as may, under the facts and circumstances of the case, be deemed just and proper by the said Department of Public Works and also to charge the cost of the removal of any encroaching fence to the owner of the said fence. Upon the failure to pay any of the said charges, the department shall cause liens to be filed therefor, in the name of the city, in the manner and according to the practice prescribed by law with respect to municipal claims.
53 P.S. § 13875