Conn. Gen. Stat. § 4b-103

(b) Except as provided in subsections (c) and (d) of this section, the Commissioner of Administrative Services shall not enter into a construction manager at-risk project delivery contract that does not provide for a maximum guaranteed price for the cost of construction that shall be determined not later than the time of the receipt and approval by the commissioner of the trade contractor bids. Each construction manager at-risk shall invite bids and give notice of opportunities to bid on project elements on the State Contracting Portal. Each bid shall be kept sealed until opened publicly at the time and place as set forth in the notice soliciting such bid. The construction manager at-risk shall, after consultation with and approval by the commissioner, award any related contracts for project elements to the responsible qualified contractor submitting the lowest bid in compliance with the bid requirements, provided (1) the construction manager at-risk shall not be eligible to submit a bid for any such project element, and (2) construction shall not begin prior to the determination of the maximum guaranteed price, except for the project elements of site preparation and demolition that have been previously put out to bid and awarded.

(c) Construction may begin prior to the determination of the maximum guaranteed price for the project elements of site preparation, demolition, public utility installation and connections, and building envelope components, including the roof, doors, windows and exterior walls, provided (1) the project is the renovation of an existing building or facility; (2) the project element or elements involved in such early work have been previously put out to bid and awarded; and (3) the total cost of construction of the early work does not exceed twenty-five per cent of the estimated cost of construction for the entire project.

(d) If such project involves the renovation of an existing building or facility that will be performed in multiple phases while such building or facility remains occupied, the Commissioner of Administrative Services may enter into a construction manager at-risk project delivery contract that provides for the maximum guaranteed price to be determined for each phase of the project, prior to beginning each such phase, provided all requirements of subsection (b) of this section other than the timing of the determination of the maximum guaranteed price are complied with.