Today, with the greater importance of the environmental performance of construction materials, a significant development of precast concrete sandwich elements (PCSEs) is ongoing. With the PCSEs improving and becoming more thermal and energy efficient, it is becoming more attractive for architectural design and for acquiring Leadership in Energy and Environmental Design (LEED) certification.The focus of this study was to conduct and analyze experiments related to the shear properties of fibre reinforced polymer (FRP) plate connectors in newly developed composite façade elements. The idea of using FRP plate connectors was based on research conducted by the European Commission funded FP7 project H-House, where new innovative materials are used to achieve a more thermally efficient sandwich element that would also be lightweight, energy-efficient and durable. The work was performed in cooperation with the Swedish Cement and Concrete Research Institute (CBI) in Borås, where the laboratory tests, with four different variations of FRP plate connectors, were conducted. To analyze the results, a method called double shear test was used for stabilization of the test specimens and minimize the eccentricity of the applied vertical load. The experimental results indicated that an improved shear bearing capacity was achieved, especially for one connector type, though the effect on the stiffness was depended on how well the specimens were cast. Furthermore, it turned out that the placement of the carbon fibre reinforcement (CFR) in the inner and outer panel played a major role regarding the FRP connectors’ contribution to the shear forces. A qualitative analysis of sustainability regarding the composite elements in construction was also done.In conclusion, the FRP plate connectors have been shown to be robust and stiff enough to develop composite behaviour of the precast concrete sandwich elements and being thermal resistance, e.g. a good alternative to using in thick façade elements and reducing thermal bridging.