The job is a two phase design and build scheme with the first phase to build a new 20 bed unit due to start in May .
Phase two will include the demolition of the exiting McGuiness Unit and formation of the car park and hard and soft landscaping areas.
The contract also includes the construction of a new college both for in-patients and day patients together with support accommodation.
Chris Hamer, managing director, of the northrn construction division. said: “IHP is a leading provider of outstanding health care solutions and we would be delighted to provide a facility that will enable the young patients to receive the highest quality of specialised health care services.”