Except as otherwise provided in this section and sections 81-3449 and 81-3453, the state and its political subdivisions shall not engage in the construction of any public works involving architecture or engineering unless the plans, specifications, and estimates have been prepared and the construction has been observed by an architect, a professional engineer, or a person under the direct supervision of an architect, professional engineer, or those under the direct supervision of an architect or professional engineer. This section shall not apply to any public work in which the contemplated expenditure for the complete project does not exceed one hundred thousand dollars. The board shall adjust the dollar amount in this section every fifth year. The first such adjustment after August 27, 2011, shall be effective on July 1, 2014. The adjusted amount shall be equal to the then current amount adjusted by the cumulative percentage change in the Consumer Price Index for All Urban Consumers published by the Federal Bureau of Labor Statistics for the five-year period preceding the adjustment date. The amount shall be rounded to the next highest one-thousand-dollar amount.