Subsidized tariffs provided no incentive for energy efficiency investments in the building sector in the past, but increasing energy tariffs now make such investments important for the economic development of any establishment. The energy costs for both residential and public buildings like schools, hospitals, colleges and offices comprise a substantial part of the municipal budgets. To reduce the energy consumption and costs, and to improve the indoor environment, it is necessary to renovate and implement energy efficiency measures in buildings. Projects should be developed and implemented in a structured and efficient way, requiring good Energy Auditing and Project Management methods and tools. This capacity does not exist at a sufficient level today. Therefore, capacity building on these issues is essential to achieve a sustainable development.