If the proceedings are for a lawful purpose, unaffected by fraud, and do not violate any constitutional limitation or restriction, defects or irregularities in proceedings under this chapter do not invalidate the proceedings. No action may be commenced or maintained and no defense or counterclaim in any action may be recognized in the courts of this state founded on any defects or irregularities in proceedings under this chapter, unless commenced within thirty days of the adoption of the resolution of the governing body awarding the sale of warrants to finance the improvement.
40-22.1-14. City auditor's statement of estimated cost required - Governing body to enter into contracts. Before adopting or rejecting any contract proposed under this chapter, the governing body shall require the city auditor for the municipality to make a careful and detailed statement of the estimated cost of the work. The governing body may not award the contract if the city auditor's estimate prepared under this section exceeds the estimate prepared under section 40-22.1-04. If all proposals are not rejected, the governing body shall award the contract to that person, firm, corporation, limited liability company, or other entity best able to perform the work, upon the basis of cash payment for the work.