Flintshire County Council has put the £33m redevelopment of Theatr Clwyd out to tender.
The major revamp to help secure the long-term future of the 1970s site will be funded by Flintshire County Council, the Arts Council of Wales and Welsh Government.
The project includes the complete strip-out and refurbishment of the existing buildings and the new build construction of a timber foyer extension and carpentry workshop.
The tender document says: "The much needed refurbishment of Theatr Clwyd will revitalise the theatre for the next generation. It will provide a new home for the local community and prevent the much loved building from possible closure.
"A new timber extension at the front of the building provides a new, welcoming foyer space at three floors and contains a new double height restaurant, bar and café, as well as a meeting room and Green Room.
"Two new rehearsal rooms are provided, including a full height room that can take a rehearsal for the Anthony Hopkins Theatre stage, the Clwyd Room is refurbished with the floor raised to all one level, and a series of designated flexible rooms for community groups are created for creative engagement, kids play and Health and Wellbeing. A sensory garden and kids play area are provided on the east elevation."
There would be further improvements to the auditoriums, backstage areas and to the building's accessibility. Under the proposal there would also be energy savings measures - including better insulation and the use of renewable energy sources like solar panels and air source heat pumps.
Tenders must submitted by May 27. Those tendering have to have a minimum level of turnover of £66m per year for the past three years.
