In Britain, the general project valuation, the owner will appoint a quantity surveyor to complete. Surveyors are mainly based on comparative method and value coefficient method, through the evaluation of long-term practice, under the condition of engineering cost information rich, even establish project cost database, the bidding documents listed in the price of each piece of goods has its own standard. In value, quantity surveyors Suggestions design data provided by the different phases of the project, compared with the previous project, in combination with the current construction market, determine the project unit price. Not computing project (or no comparison), along with the data of other construction cost analysis. In a project bid, the contractor's estimate general with own experience to complete, usually, a project subject to tender according to the enterprise quota for labor, materials, mechanical quantity calculation, and artificial price is mainly according to the labor subcontractor's offer, according to the comparison of material supplier unit price discipline construction, the contractor based on market supply and demand situation, determine the management fee rate, finally reflect the local actual project bidding quotation. In short, project appraisal, one party is an important basis, based on market conditions is completely dynamic evaluation.
In the United States, the project cost estimate is mainly composed of design department or company for professional evaluation, cost engineer (cost engineer) in the concrete preparation of project cost estimation, besides considering the characteristics of the project (such as project intends to adopt unique technology and new technology, project management, conditions of the existing conditions and resources, etc.), the rest of the world is difficult, usually have a detailed risk analysis research project, to determine the appropriate reserve fund. But to determine the proportion of reserves is not fixed, the degree of risk as the project, to determine the size of the different proportion. Cost engineer by mastering the rules of the different interest rate adjust the overall level of cost estimation.
The engineering cost estimation of labor mainly is divided into two parts, basic salary and additional salary. Among them, the new salary project including management fees, insurance premium, labor protection, pension, tax and other costs, raw materials and machinery for the market or the market rental prices as a cost is calculated on the basis of and artificial cost, according to certain proportion in the total basic raw materials and machinery use fee (usually 10%) overhead and profits.