Open and green spaces in hospital serve manifold purposes (e.g. transportation or storage. Furthermore, they are prized places for building activities rather than used for therapeutical or preventive issues. In accordance with Hartig and Cooper Marcus (2006), outdoor space at health care facilities should support well-being and health, such space should be designed as ‘healing garden’ also. The project was aimed to assess the physical structure and the accumulated subjective experience of such spaces situated at three hospitals in Lower Austria. We applied a transdisciplinary approach, combining landscape planning, environmental psychology and management.Methods were: (1) assessment of physical structure, (2) internal rating of experience using questionnaire and rating scales, (3) external online-rating of photos, (4) co-operation with managers and planners, (5) presentation and discussion of outcome with decision makers and politicians.Results show distinct differences in the physical structure as well as different effects on experience. Findings provided evidence (1) for redesign at site, (2) impacted improvement of construction work, (3) set the basis for post-occupancy evaluation, and (4) delivered an approach for evidence-based design recommendations with respect to fostering well-being and health in open and green spaces of hospitals.