Ocean warming (OW) and Marine heatwaves (MHWs) continue to increase in frequency and duration, negatively impacting vital marine ecosystems, which can alter species presence at community levels. Species richness and composition can be impacted by OW and MHWs as increases in temperatures can affect ectothermic species physiological performance, decreasing oxygen solubility, immune function, and fitness. Settlement plates and artificial units of habitats (AUHs) have been used extensively to measure biofouling communities. This study sought to understand the impacts of OW on invertebrate biofouling communities in mesocosms at Chowder Bay, New South Wales Australia. Settlement plates and AUHs were deployed within unique mesocosms at two treatment temperatures, ambient reflecting the average bay temperature and heated at +4°C ambient bay temperature and left undisturbed for a period of 4 months. Species richness and abundance on settlement plates and AUHs were measured at the end of a four month period. These results will aid in understanding the effects of OW on marine communities and inform wider conservation biology in Sydney harbour.