Installation of plastic sheet piles to protect houses on the seafront in Worthing, West Sussex was due to finish at the end of last month.
Consultant Card Geotechnics designed the scheme for contractor Cofra UK. The client was Worthing Borough Council.
Cofra's patented Geoflex vinyl sheet piling system was used to form a 5m deep, 500m long storm water barrier along the pebble beach.
The wall will protect properties behind the beach from seawater seepage through the shingle bank.
Card Geotechnics director Nick Langdon said: 'The system has major advantages in these environments, as corrosion within the design life is effectively zero and speedy installation is possible with lightweight equipment and minimal disturbance.'