N.H. Rev. Stat. § 21-I:83

I. (a) The performance of contracts for all state projects costing over $25,000 shall be inspected to assure compliance with the plans and specifications. The department shall require inspection service by one of the following methods: (1) By a registered architect or professional engineer or representative; (2) By qualified personnel of the state agency, institution or department concerned; or (3) By personnel of the division of public works design and construction, or the division's designated agent or agents. (b) Prior to the execution of a contract for a state project, the department shall notify the state agency, institution, or department concerned which method of inspection shall be followed. II. The department or its agent shall periodically give to the using agency or institution signed statements that the contract is being executed according to specifications, including a final statement that the project has been completed in accordance with the specifications. III. Manifests for such payments shall be made and signed by the using agency, department, or institution. Manifests for final payment shall certify that inspections have been carried out, that the project has been completed in accordance with the specifications and the contract, and that it has been accepted. Such manifest shall be certified by the department that the progress reports furnished by the department are correct and that inspections have been made and the provisions of the plans and specifications have been carried out.