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Buildings account for 30% of global energy consumption. Improving the energy efficiency of buildings becomes essential to reducing energy consumption for alleviating their deteriorating impacts on the environment. As one of the key elements, the building envelope is essential to reducing the building energy consumption. Recent researches have demonstrated the promise of environmentally adaptive shape-morphing building envelopes in enhancing energy efficiency over the conventional stationary ones. In this review, we briefly discuss the recent advances in energy-efficient shape-morphing building envelopes from both structural designs and engineering materials viewpoints for energy saving and energy harvesting. For structural designs, we discuss the designs and performances of four representative categories of shape-morphing building envelopes, including conventional dynamic facades with simple rigid motions, biomimic adaptive structures, reconfigurable kirigami/origami-based structures, and morphable wrinkling surface–based smart windows. For materials design, we discuss the typical materials and design strategies used for actuating the shape-morphing building envelopes and smart windows. We expect that this brief review will be insightful for developing future shape-morphing building envelopes to make buildings more energetically efficient, comfortable, and environmentally friendly.