The Beadnell Coastal Protection Scheme began in April and will continue throughout the summer.
It will focus on the defences along Harbour Road and will see repairs made to about 195m (640ft) of sea wall and the reconstruction of 125m (410ft) of parapet wall.
Conservative councillor Guy Renner-Thompson, ward member for Bamburgh and Beadnell, said the work was vital in order to protect Harbour Road.
“Once complete they will safeguard this beautiful stretch of our coast for many years to come,” he said.