Vital coast defense work is due to start this month at Coronation Parade, Folkestone, according to the Shepway District Council.
The arches and promenade that protect homes and businesses have been damaged by chloride over the years.
This has caused the reinforced steel within the concrete to corrode and expand and led to concrete cracking throughout the structure.
In some places reinforcement bars are exposed and in other parts they have been entirely eroded.
The work will be carried out in two phases. The first, which will start in late spring this year, involves repairing and strengthening the concrete arches and promenade and is expected to take eight months to complete.
The second, due to take place in summer 2017, will involve stabilizing the cliffs and extending the current rock placement at the foot of the cliffs to the east.