A method and apparatus for determining an Energy Conservation Measure (ECM) for building retrofit. An analysis apparatus receives a condition for building retrofit, and selects detailed measures of one or more Energy Conservation Measures (ECMs) for a building based on the condition. The analysis apparatus selects a maximum of one detailed measure from among multiple detailed measures of each of the one or more ECMs. The analysis apparatus provides one or more ECM determination schemes, which include an energy savings-based ECM determination scheme and a cost-based ECM determination scheme.