Marshall & Swift ® SwiftEstimator® unemployment insurance, equipment,temporary facilities, security, etc., are included. What the Costs Do Not Contain 1. Costs of buying or assembling land such as escrow fees, legal fees, property taxes, right Click on this topic to display the help for typical life: If there are several sub-topics. Apr 19, · If you look at your depreciation tables, a house with an effective age of 60 years (presumably, the end of its economic life) is only depreciated 74%. That means (using that indicator) a house with a total life expectancy of 60 years and that has an effective age of 60 years actually has 21 more years to go. Marshall & Swift building costs incorporate three cost methodologies, ensuring users have the tools for a complete and defendable determination of value. Segregated Methodology - Uses component-by-component costs of superstructures such as foundation, frame, plumbing, electrical, etc. Unit-In-Place Costs - Individual pricing of components such as windows, doors, roofs, subdivision cost and yard .