Optimal use of resources providing a life cycle

The importance of increasing the ratio of the quality of the subject to its value has long been recognized and scientific thought has always strove for the most complete and simple solution to this problem. However, when it is necessary to create a product that has a number of mutually independent properties, characteristics, parameters, structural elements, its solution still meets noticeable difficulties. How, for example, to distribute limited funds allocated to create a cottage between expenses to solve problems such as ensuring the safety of living in the cottage, ensuring the convenience of living in it and the effectiveness of decisions made? Will it be correct to divide the funds allocated for the construction of the cottage into three equal shares? Will it determine the cost of work and the cost of materials equal?