This report presents outcomes from a three-year mixed method evaluation of the Department of Health and Human Services’ low-carbon housing in Horsham, Victoria. The aim of the project was to conduct a multi-year evaluation of four new two-bedroom, single-storey, sustainably designed units with a National House Energy Rating Scheme (NatHERS) rating of 8.9 stars (Catalyst houses), in addition to seven one- and two-bedroom Control dwellings (located in Horsham). All dwellings were evaluated across a range of economic, social and environmental key performance indicators (KPIs) determined by the Department of Health and Human Services and revised by the RMIT University research team.