The CESP is an accredited laboratory specialized in matters related with the building industry. The activity of the laboratory, which belongs to the University of Perpignan, is focalized towards 3 axes: solar material testing, calibration of measuring devices, and support to the innovative companies. Its location in the heart of the Tecnosud activity area, contributes to benefit of a strong cooperation with the laboratory CNRS PROMES (Process materials and solar energy). The first activity of the CESP was the characterization of the performances of solar collectors with fluid transfer. Afterward, the laboratory has developed a set of services to answer all kind of demands in relation with solar energy (thermal, photovoltaic, structures…).