During the incident, the ground beneath the outdoor area of one of the Longbeach Apartments was washed away, causing the patio to collapse.
However, those living at the flats have been assured that the building was built on piles and therefore never structurally at risk.
Contractors Brenwal waited for the tide to recede yesterday before filling gaps in the wall with concrete. As part of the temporary repairs they also placed sandbags on the beach to act as a sea defence.
The subsidence follows a similar incident at the end of last month when the seawall opposite El Tico was battered by large swells causing a ‘dangerous and very unstable’ void to open up at the nearby steps.
Staff from the Infrastructure, Housing and Environment Department poured tonnes of concrete into the void to try to stabilise it until permanent repairs could be carried out.
Elsewhere, plans to replace the seawall on Maîtresse Île at the Minquiers were approved in September last year.
The old wall on the island – which lies around nine miles south of Jersey and comes under the authority of Grouville – had partially collapsed.
It was due to be replaced by a ‘recurve’ wall which deflects waves back out to sea – similar to those recently installed at Beaumont and the eastern end of Le Hocq.
