N.H. Rev. Stat. § 21-I:82

Without limiting the provisions of RSA 21-I:80 and RSA 21-I:81, and to enable the department to maintain a client relationship with the using agencies or institutions in the construction of capital budget items, the department is authorized to: I. Determine requirements, prepare estimates, advertise, receive bids and award contracts subject to the approval of the governor and council. The department is also authorized to execute all contracts for projects in the name of the state and for the using agency or institution, with the advice and assistance of the attorney general; and after the concurrence of the governor and council, the commissioner of administrative services and the using agency or institution, subject to other statutory limitations. II. Cause to be undertaken and completed, all construction exceeding $25,000 for any individual project, except as otherwise authorized by the governor and council. III. Exercise general supervision, control and direction over all matters pertaining to design, construction, maintenance standards, and preservation of all state buildings, and related facilities. IV. Except as otherwise authorized by the governor and council, cooperate with the department of environmental services by letting for contract, and supervising, all projects on state-owned dams and reservoirs, and performing inspections requested by the department of environmental services. However, operation of facilities under the control of the department of environmental services shall not be delegated to the department of administrative services.