THE cost of repairs to the stretch of coastline from Newlyn to Marazion is likely to top £6 million.
As well as the storm damage to Penzance promenade and Newlyn Green, there has also been a breach of coastal defences at Eastern Green and Long Rock, while a number of large granite boulders which sit on top of Penzance's South Pier harbour wall have been dislodged.
Work has started at Eastern Green to prevent problems occurring at the Penzance end of the railway line to Paddington, as well as to neighbouring properties and the South West Coastal Path.
The cost of carrying out interim repairs has been put at £685,000 but it is estimated a further £5.6 million will be required to carry permanent reparation; in addition, another £44,000 will be needed to repair damage to the piers at St Ives.
Cornwall Council leader John Pollard, speaking after David Cameron's visit to the county, said: "The latest estimate of the costs of repairing our infrastructure is £21.35 million.
"We are very grateful for the Government's decision to reduce the threshold for the Bellwin scheme to help large authorities like Cornwall and we have asked Mr Cameron to further extend the time for submitting claims under the scheme to give us enough time to put our bid together."
Penzance's top police officer has criticised people who have been risking their lives on the prom in the recent weather.
"The majority of the people who came to storm watch were well behaved," said Inspector Jean Phillips. However, there was a small minority who took unnecessary risks, some with young children.
"This never ceases to amaze me particularly when you see how the big the slabs coming off the promenade were and how far they travelled."
Inspector Phillips said she was also disappointed that people gave abuse to the council workers who were working hard to make Newlyn Green safe by setting up diversions.
She said local officers responded to numerous calls of trees and power lines down but their biggest commitment was to closing the prom when required during the times either side of the high tides.