||There is a great need for economic analyses in the construction process,especially at the early stages of the designing process. At the department ofByggproduktionsteknik (Construction Management) at the School of CivilEngineering, Lund University a computerized system of building economics isunder construction. It has been named SYRE. The overlapping purpose ofSYRE is to cover all kinds of cost estimating concerning a building project.Today (October 1988) the part of the system dealing with investment costs forordinary builders work is completed.The SYRE system is based on cost datas concerning all kinds of components(e.g. bricks or studs). The components are specified with man hour andmaterial cost per unit. The components are combined into various sections andthe sections are combined to various buildings. All the costs are continuouslyupdated, thanks to the up-to-date prices on the material and thanks to theResource Register where wages, indirect labour costs, general requirements,overhead and benefit are continuously updated. All the quantities in thebuilding project reports are related to the gross area of the building, Thus, it ispossible to rapidly estimate the effects of changing the size of the building orthe changing of one section to another or one component to another.The system is now used to develop a new estimating model for governmentloans for housing on behalf of the Swedish Ministry of Housing.