| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 100 === Green buildings have been implemented in Taiwan for more than ten years, but green costs are not understood well. Although the costs of green buildings have been studied in other countries, they are usually collected from questionaries for the total with certain percentages of cost increase. They do not have the costs of building components that would be difficult to understand the cost changes for green buildings.
This research analyzed and compared the costs of green buildings by using five case projects. Green buildings will incur soft cost and hard cost. Soft costs are incurred by the architects increasing their time consumption on design and documentation. Hard costs are increased from construction and analyzed from the line items of the Bill of Quantities of a project. The differences of line items, quantities and unit prices were compared between the green buildings and tradition ones. Then the percentages of hard costs are calculated.
The research findings show that the cost would be different for different green buildings. Cases A, B, and C are schools and they focus on energy saving of the building shell. For example, the major green measures of case A are metal roof plate and its sapwood, and moisture-proof gypsum ceiling for a total amount of 735 NTD/m2 ¬¬, and accounted for 35％ of soft cost (total increased time) and 80％ of hard costs (total increased money); the major green measures of case B are metal wall, horizontal and vertical shading for a total amount of 844 NTD/m2, and accounted for 35％ of soft cost and 56％ of hard costs.
The green cost of four green buildings increased 4.9% on average, in which the design cost inceased 0.9%, and the construction cost increased 4%. Also, the average green cost is 1,395 NTD/m2, the design cost increased 270 NTD/m2 and construction cost increased 1,125 NTD/m2. These average numbers are very preliminary because of limited cases.
Concerning the green cost and design difficulty of EEWH, it is found that hard cost is not much related to design difficulty (r=0.38), but soft cost and design difficulty are positively related (r=0.79). Moreover, based on the research of hard cost and design difficulty, the order of adopting EEWH indicators is suggested as follows: (1) Energy saving, Water retention, Waste reduction, Water resources and Sewage and garbage improvement, (2) Biodiversity and Greening, (3) CO2 reduction and Indoor environment. But the order can vary according to the project’s conditions.
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