Patients were temporarily relocated to Bushey Fields Hospital in Dudley in September 2023 while the refurb took place.
They, along with staff from the older adult wards, will transfer back to Edward Street once it reopens.
Chris Masikane, chief operating officer at the trust, said they felt “proud” to reach the milestone.
“This major capital development is about creating a safe, modern, and therapeutic environment where older adults can receive the very best care, with dignity and privacy at the centre,” he said.
The reopening comes just over six months after the purpose-built Dorothy Pattison Hospital Older Adults Unit opened in Walsall to provide inpatient care for older adults with dementia and mental health conditions.