Alloys of sulfur, selenium and tellurium, often referred to as chalcogenide glasses offer a highly versatile material platform for reconfigurable metasurface applications. They present various high- and low-index dielectric, low-epsilon and plasmonic properties across ultra-violet (UV), visible and infrared frequencies, in addition to an ultra-fast, non-volatile, electrically or optically induced switching capability between amorphous and crystalline phase states with markedly different electromagnetic properties. We show through high-throughput combinatorial material discovery techniques that these properties can be stoichiometrically engineered across a wide spectral range. Furthermore, we present recent developments in their application to non-volatile reconfiguration in photonic metamaterials and metasurfaces devices, including: switchable ‘structural colors’ underpinned by a reversible optically induced transition between dielectric and plasmonic states across visible frequencies; and the first reconfigurable dielectric metamaterial operating across the UV to high-energy visible (HEV) wavelength band, wherein a phase change chalcogenide is hybridized with a transparent, high-index glass supporting the resonant mode. We go on to show recent efforts in the integration of such materials with commercial optical fibres to realize non-volatile reconfigurable optical attenuators for intensity and dispersion control.