The plan is to start works to the Hall in spring 2014, with the venue undergoing a period of closure from 24 May until the end of October 2014.
Upgrade proposals includes big improvements to front-of-house areas including the foyer, box office and bars, plus lift access to all levels.
It will also see the rebuilding of the stage and choir performance areas as well as new rehearsal and backstage facilities.
There will also be a new performance space for small-scale concerts, learning events and other activities.
The full programme of works will be completed during 2015, the 175th anniversary of the founding of the Royal Liverpool Philharmonic.
Tenders or requests to participate must be sent to Matt Cawley at Deloitte LLP, 2 Hardman Street, Spinningfields, M3 3HF Manchester
Telephone: 01614556508. E-mail: [email protected]