The paper deals with economic connections in the
complex view of a building life cycle. Approaches for considering
individual benefits and costs occurring in connection with
building construction, use and demolition are characterized here.
The basic approach is the BLCC (Building Life Cycle Costs)
method, subsequently supplemented with the LCA (Life Cycle
Assessment) method that also provides for environmental
impacts. The WLC (Whole Life Costs) method is derived at the
end of the paper, comprising all relevant current and future costs
and benefits in the building efficiency assessment.