Due to the current crisis, there is a clear and urgent lack of personal protective equipment (PPE), particularly face masks of various kinds. As a result, standardised protocols are changing and increasingly substitute masks are being used in healthcare situations. However, these are less effective, unregulated and untrusted by most healthcare staff. After significant research and interviews with healthcare workers, we have designed an open-source COVID-19 Decontamination Toolkit using UV-C light, with readily available parts, clear building instructions, and a protocol to run the setup. The goal is to give individuals and organisations who are in need of such equipment the opportunity to extend the life of their precious resources, and stay safe for longer.