The Health Promoting Hospitals (HPH) networks, founded by the World Health Organisation, support the introduction of health promotion in healthcare. This development involves the creation of a health promoting built environment. However, few studies have explored the HPH in relation to the built environments, and it is unclear how HPH-networks incorporate the built environment in their work. The study therefore examined the Swedish HPH-Network in relation to the built environment. The mixed-method study included data from (i) key online material from the Swedish network, (ii) a survey with open-ended questions of representatives of the networks' workgroups and (iii) semi-structured interviews with the built environment workgroup. The study showed that the built environment is unevenly and incoherently incorporated in the network. Moreover, there is more attention for healing and healthy rather than health-promotive strategies, indicating a knowledge gap. Descriptions of the health promoting built environment are diverse, and address design features, design strategies or indicate places for health promotion interventions. The descriptions of the built environment are combined with various HPH goals and population groups. To utilize the built environment as a resource for HPHs, the networks should consider incorporating the built environment in documents and action plans at all organizational levels.