New energy-saving technology based on Smart Materials is rapidly evolving and becoming more cost-effective, with much shorter payback periods. Investing in the renovation of existing building stock with Energy-Saving Technologies, such as innovative Smart Materials, provides a chance to improve housing energy efficiency. Smart Materials are being developed on a small scale due to a lack of understanding about their changeable properties and dynamism in how they respond to energy fields. The technological chain involved in the design, production, and implementation of Smart Materials in building refurbishment could allow the energy performance of buildings to influence their value. Smart Materials also reduce the load intensity on distribution electricity and heating networks, resulting in better indoor conditions by reducing the building's exposure to temperature fluctuations of outdoor conditons.