Reliable encapsulation of perovskite photovoltaic solar cells is an important factor for the stability of devices and therefore a crucial factor in the upscaling and ultimate commercialisation of the technology. The CHEOPS project therefore included evaluation of different encapsulation processes. The results included evidence that long-term testing of devices show performance maintenance of 80% after 70 days, if devices are kept in the dark, at open circuit condition, room temperature and inert conditions. Last but not least, CHEOPS partners from CSEM could show that the best performing cells degrade less than 10% relative after 1000 hours of damp heat. This result is still far from IEC standard, but encouraging as the selected process is common in the PV industry and holds great promises for future upscaling.