Energy Consumption: Zero energy building aims to reduce building energy consumption to zero. Although an energy efficient building is designed to reduce energy consumption, the building does not aim to completely eliminate energy consumption. Energy Production: The zero energy building is designed with the capacity to produce its own energy. This means they can cover building energy consumption by using energy from renewable energy sources. Energy efficient buildings can produce energy from renewable energy sources, but this may not be enough to meet the entire building energy need. Design and Materials: Zero energy buildings are designed to prioritize energy efficiency in design and material selection. This requires taking into account factors such as the building's sunlight utilization, heating and cooling system, thermal insulation, correct material selection and ventilation. Energy efficient buildings aim to reduce energy consumption by making similar design and material choices, but they do not require as advanced a design and technology as zero energy buildings. Cost: Zero energy buildings are more costly due to renewable energy systems and advanced technologies used for energy production. Energy efficient buildings, on the other hand, although designed to save energy, may cost less. The concepts of zero energy building and energy efficient building are important to promote energy saving and the use of environmentally friendly energy sources in the building sector. While both concepts include steps to reduce energy consumption, the energy-efficient building is a more feasible goal at the moment, while the zero-energy building points to a more advanced goal.