Energy efficient renovation (EER) of the owner-occupied building stock is identified as a key effort to pursue in order to mitigate climate change. However, current renovation rates continuously fall behind and a need to foster EER uptake is apparent. As homeowners' behaviour and decision-making are crucial in the context of EER, behavioural research holds vast potential for policy design and ultimately increasing EER uptake. So-called ‘spilling effects’ in the domain of pro-environmental behaviour (PEB) continuously catch the attention of researchers. Therefore, this article proposes a conceptual framework of ‘spilling effects’ in the context of homeowner EERs based on an integrative literature study, facilitating policy design.@en