Creates the Municipal Design-build Contracts Division in the Illinois Municipal Code, which may be cited as the Municipal Design-build Authorization Act. Provides that a municipality may enter into design-build contracts. Includes scope and performance criteria for design-build contracts, a two-phase procedure for selection of contracts, requirements for submission of proposals, procedures for awarding contracts, and requirements of reports and evaluation of contracts. Provides that, if the total overall cost of a project is estimated to be less than $12,000,000, the municipality may combine the two-phase procedure for selection into one phase. Senate Committee Amendment No. 1 In provisions about submission of proposals, provides that, after a response to a request for qualifications or a request for proposal has been submitted, a design-build entity may not replace, remove, or otherwise modify any firm identified as a member of the proposer's team unless authorized to do so by the municipality. House Floor Amendment No. 1 Adds reference to: 105 ILCS 5/Art. 15A heading new 105 ILCS 5/15A-1 new 105 ILCS 5/15A-5 new 105 ILCS 5/15A-10 new 105 ILCS 5/15A-15 new 105 ILCS 5/15A-20 new 105 ILCS 5/15A-25 new 105 ILCS 5/15A-30 new 105 ILCS 5/15A-35 new 105 ILCS 5/15A-40 new 105 ILCS 5/15A-45 new 105 ILCS 5/15A-50 new 105 ILCS 5/15A-90 new Creates the School Design-Build Contracts Article in the School Code, which may be cited as the School Design-Build Authorization Law. Provides that a school district may enter into design-build contracts. Includes scope and performance criteria for design-build contracts, a 2-phase procedure for selection of contracts, requirements for submission of proposals, procedures for awarding contracts, and requirements of reports and evaluation of contracts. Provides that if the total overall cost of a project is estimated to be $12,000,000 or less, the school district may combine the 2-phase procedure for selection into one phase.