The programme of works will involve a major upgrade of the Emergency Department at Walsall Manor Hospital.
This will increase capacity and support the Trust’s integrated model for emergency care services.
Interserve will start work in April next year with a targeted completion date of spring 2022.
The job was secured through the Department of Health’s ProCure22 Framework.
Interserve Construction will be responsible for putting in place new infrastructure, designing and constructing a new two-storey Emergency Department and redeveloping the existing A&E facilities.
Simon Butler, divisional director at Interserve Construction, said: “We will be able to bring our considerable experience in the healthcare sector to the project.
“Our overall aim is to create a high-quality, modern development which will enable Walsall Healthcare NHS Trust to improve the patient experience.”
Russell Caldicott, finance director at Walsall Healthcare NHS Trust, said: “This is the biggest capital project in our pipeline and we are delighted to be working with Interserve Construction on it, whom we believe have the right expertise to and are able to deliver real value for us.”