§ 6. Contracts - Lowest responsible bidder.

In the erection, improvement or repair of all public buildings and works, and in all street and sewer work, the cost of which is to be paid from funds realized by bonded indebtedness of the city or by assessment against any particular property in the city, the work shall be let to the lowest responsible bidder; provided, however, the council may reject any and all bids if deemed excessive, and readvertise for bids, or provide for the work to be done by the city.

In case no bid is received, the council may likewise provide for the work to be done by the city.

When the estimate of the cost of said work by the city engineer shows the said work can be done for an equal or less cost than that of the lowest bid, then any of the work herein mentioned may be done by the city, and the city shall be deemed the contractor, with the right to enforce all liens, and with the same powers, rights, duties, and obligations as are made and provided by the laws of the state for contractors who have entered into contracts to do such work as the lowest responsible bidder.

The council shall have power to adopt ordinances for the purpose of carrying out these provisions, and such ordinances shall be supplemental to the existing laws of the state, and shall have the same force and effect.