§ 12. Details of construction; contracts for construction.

The council shall have power to determine the character and type of construction and of material to be used and to determine any other details of plan or construction necessary to be determined in making any local improvements and to determine whether any work to be done by the city shall be done by contract or by the city. The council shall have power also, unless otherwise limited, to determine the number of water, sewer and gas laterals that shall be laid to any lot on any street to be improved. If the work or any part thereof is to be done by contract, the council may let all of the work in one contract, or it may divide it into several contracts, and may let contracts separately.