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The research project EnOB (which was initiated and funded by the German Ministry for Economics and Technology) ascertains and evaluates the complete capital costs of energy optimised buildings. This allows the costs to be compared with those of ‘conventional buildings’ of similar size and use. In this way the differences in capital costs between energy optimised and conventional buildings can be analysed. In an EnOB research project the construction costs of 13 new office buildings were analysed. An overview of the buildings technical features can be found on www.detail.de/g039. The main energy requirement for the technical operation of the buildings lies between 60 and 120 kWh/(m² net floor area · a) and about 60 to 80 % less than the required value of EnEV 2007.The analysis revealed trends among the sample cases, such as, that the construction costs for building and technical services (cost groups 300 and 400 as per DIN 276) were similar to those for standard new builds with the exception of case 7. These results correspond with documentation (for example), that by adhering to principles of integrated planning the additional costs for energy optimised office buildings usually do not exceed 5 % and are mostly lower.