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LEGEP is a tool for integrated life-cycle analysis. It supports the planning teams in the design, construction, quantity surveying and evaluation of new or existing buildings. The LEGEP database contains the description of all elements of a building (based on DIN 276); their life cycle costs (LCC) based on DIN 18960 and on the calculation rules of the German DGNB and BNB Sustainability Certification.

All information is structured along life cycle phases (construction, maintenance, operation, cleaning, refurbishment and demolition). LEGEP establishes the energy needs for heating, warm-water, electricity and their costs (following EnEV 2009 and EN 832). The environmental assessment comprises the material flows (input and waste) as well as an effect oriented evaluation based on DIN EN ISO 14040 – 44.

LEGEP is organised along several software tools, each with it’s own database. The method is based on cost planning by “elements”. The database is hierarchically organised, starting with the LCI-data at the bottom, building material data, work-process description, simple elements for material layers, composed elements like windows, and ends with macro-elements like building objects. The data are fully scaleable and can be used either “bottom-up” or “top-down”.

Elements at each level contain all necessary data for cost, energy, and mass-flow and impact evaluation. A building can be described using either preassembled elements or defining elements from scratch. The user can also define a specific composition by exchanging layers or descriptions of the element. The advantage of the top down approach is its completeness: if an element is not explicitly changed or eliminated it will remain in the calculation. The costs of the elements are established by the SIRADOS database, which is published each year. There are about 6.000 elements “ready for use” for the building fabric, technical equipment and landscape work. The LC Inventories are based on the German Ökobau.dat, used for the German DGNB and the BNB Sustainability Certification.