Rainwater harvesting (RWH) and grey water recycling (GWR) are ways of generating alternative sources of water. A new review sets out the costs and benefits This can be used for some non-potable uses instead of mains water which is treated to meet strict drinking water standards. To date, both RWH and GWR systems have been implemented with mixed experience in the UK. There remains a gap in research and accreditation for these systems in support to bring them to the market on a wider scale. There has also been a lack of coordinated and collated evidence across the country, especially on differing scales and for non-domestic properties. Information guides published by the Environment Agency in 2010 and 2011, outlined the costs and benefits for domestic installations, but these are now largely out of date. This work aims to address this research gap. Drawing on academic and industry research, case studies and industry examples, an appraisal of RWH and GWR systems and the costs and benefits of the existing technologies in different contexts have been modelled. The cost benefit analysis sought to access the various impacts associated with each system and monetise these impacts to allow for a comparison. Systems are broken down by the size and type of building they would be installed. The analysis allows for a comparison of the private net impact (does the system pay for itself through a reduced water bill) as well as the wider impacts. The findings summarised below form an update to the information guides published by the Environment Agency.  Click here to download the report