We understand 'hardcore' in its original sense as a (vernacular) builder's word, which refers to the assorted bits of debris and clinker that are crunched together to form a building foundation. We appeal for an ethics-and politics-of rebuilding, which is rooted in the fragile, but unyielding, hardcore of the Ukrainian (and planetary) commons; and which makes manifest the structures of care, repair, solidarity-and resistance-that sustain it.