Integrating technological advancements in construction materials, such as smart devices, presents an opportunity to enhance the physical environment. This study explores the design of mortars incorporating plastic optical fibres (POF), LEDs, and sound sensors, to enhance architectural interactivity and user experiences. The mix design of the mortars, aimed to reduce Portland cement content, includes 150 kg/m3 of Portland cement for general use, 100 kg/m3 of calcined clay, and 400 kg/m3 of limestone filler. Compressive strength tests compared reference samples without optical fibres, to samples with varying numbers (1, 4, and 9) of transverse POF. Results showed approximately 1% and 5% increase in compressive strength in samples with 1 and 4 POF compared to the reference, respectively, with a decrease observed at 9 fibres, suggesting optimal performance was obtained with 4 POF under these conditions. Additionally, the material’s interactivity was showcased through POFs connected to visible LEDs, enabling dynamic colour changes based on the sound amplitude measured by acoustic sensors. This interaction enhances the aesthetic dimension of architectural elements and introduces the potential for innovative applications in architectural design; for example, adaptability to different sound environments, customizable programming, along with artistic and aesthetic possibilities. The material's contribution to reduced cement consumption and environmental awareness, also enriches the comprehensive exploration of this interactive construction element.