Health and Social Care has submitted a planning application for the first phase of the Princess Elizabeth Hospital modernisation.
Building work is set to start on the project in the middle of next year and should resolve some clinical needs that the hospital faces in its current layout.
It follows last month's call for expressions of interest from the local building industry.
The design was revealed in August.
The £90 million modernisation programme is to be rolled out in three phases and is due to be completed by 2027.
The first stage will include expanding the Critical Care Unit to 12 beds, a ten bed Theatre Recovery unit and the necessary drainage and electricity supply work.
Changes to the main entrance and Maternity come in phase 2, and to the Emergency department in the final stage.
Prospective suppliers can still register their interest in the project through the States of Guernsey Procurement Portal.
Perfect evening for Guernsey's 2026 Air Display
The Red Arrows pull out of performing over Guernsey
Guernsey's Ladies' Pool reopens after pollution incident
Passengers at Guernsey Airport told to expect some flight disruption
Guernsey flights impacted by UK air traffic control issue
Engine fault sees private jet diverted to Guernsey Airport
Travel issues ahead of Channel Islands Pride
WATCH: Car 'sails' from Guernsey to Sark
