The Cronulla High School upgrade was completed in five stages:
- Stage 1 saw the shade structure previously attached to Building B successfully relocated and attached to Building D. This was completed in January 2023.
- Stage 2 saw the completion of Building M in December 2023, which offered six new advanced teaching spaces along with enhanced facilities. Building M commenced operation for school use from Day 1 Term 1, 2024. Stage 2 also saw the completion of the hall extension and new library entrance.
- Stage 3 saw the relocation of Building I that was completed in February 2024.
- Stage 4 saw the completion of Building L, as well as a new carpark and forecourt area. Building L delivered four new teaching and general learning spaces, an administration area, staff spaces, and student and staff amenities. This building was handed over for use on Day 1 of Term 4, 2024.
- Finally, Stage 5 saw the completion of refurbishment works within existing Buildings A, C, D & E, including upgrading teaching spaces and staff spaces. These were handed over for school us on Day 1 of Term 1, 2025.