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However, at the end of the 10 years, the home owner sells the house and recoups some of the initial additional investment costs. Depending on the residual value estimation approach, the present value net cost savings in life-cycle costs to the homeowner is either $41 714 or $84 997.
As the cost of maintenance has been estimated at 50% of total life cycle costs (Van Vliet [2000]), it is apparent that further study into this field will be necessary. Cost savings in this area can have a large impact on the overall life of a software project.he total cost of system maintenance is estimated to comprise at least 50% of total life cycle costs (van Vliet [2000]). The proportional maintenance costs range from 49 % for a pharmaceutical company to 75% for an automobile company in some studies according to Takang and Grubb [1996].