A study by The Center for Health Design reviewed more than 600 research studies to identify impacts that hospital design can have on patient outcomes.  The number one recommendation from this review:  get rid of double-occupancy rooms and provide patients with single rooms that can be adjusted to meet their medical needs as they change during their stay.

The evidence... supports making rooms capable of handling more server cases, say Ulrich and Zimring. Such "variable acuity rooms" are, for example, equipped so... critical care equipment can be brought in to tide a patient over through a crisis.  Variable acuity rooms greatly reduce the need for transfers, during which a great many medical errors occur.  "When transfers occur lots and lots of things go wrong", says Ulrich.

Findings showed that the variable acuity rooms (or universal beds) reduced transfers by 90%, reduced medication errors 67%, and resulted in a savings of $5 million per year.