One of the most important parameter in building process, that is used in public and private procurement, is the lowest price. In other words – legislation of Latvia permits that in estimate forming process does not include criterions of quality, durability, the potential high cost of maintaining the building during the exploitation time. That allows the builder reduce the cost of estimate using the cheaper product or technology and let not to provide highest possible quality and the basic principle of sustainable construction. One of possible construction cost reduction solutions is replacement of building material with equal building material, at the same time assessing the quality and replacement impact on the estimate direct costs. Tasks of the research: do literature analysis (what is estimate, what include estimate, on what basis it is made); analyse existing building estimate, figure out which building materials is used, search for technical characteristics of materials, also explore specific junction of construction; replace selected building materials with analogous, thus reducing the direct costs of estimate; assess the impact of the building material price to quality; compere obtained estimate costs with current estimate costs; do laboratory research and compare the building materials and analogue materials technical characteristics, are they performing parameters that is definite in the declaration of performance. As a result, obtaining construction direct costs comparison and analyzing the quality of building materials, it is possible to provide the most appropriate offer of the estimate direct costs to satisfy customer's interests.