International Energy Agency’s Energy in Buildings and Communities Program Annex 61 focuses on developing and demonstrating financial and technical concepts for deep energy retrofits of public buildings. A first and important step to define the methodology is to examine the economic aspects of deep energy retrofits in each of the participating countries. Estonia, Germany, Canada, Austria and Denmark have conducted a series of simulations in order to determine the economic conditions in the renovation of a pre- 1980s building. The analysis shows how deep renovation solutions and economic conditions differ from country to country and emphasizes the individual economic challenges of deep energy renovation. The analysis will be used in developing and demonstrating new and alternative funding mechanisms for a deep renovation project. This paper describes results for northern Europe, i.e. Estonia and Denmark.