Conduction of technological and price audit is an obligatory procedure for investment and construction projects with state participation. This audit should help minimize the financial costs of budget money. However, the analysis revealed serious shortcomings in the methodology. The aim of the work is to improve the existing methodology at the first stage of the technological and price audit - a feasibility study. The tool is a method of expert assessments, with the help of which the partition weights are calculated. Each section has a different influence of error probability on cost, which is also taken into account in the work. Also, the work suggests criteria for calculating the effectiveness of the project. On the basis of calculations, a mathematical model of the result of technological and price audit was created.