Guernsey Ports is spending £300,000 on new pontoons to replace ones built in the 1970s that are still in place at the Albert and Victoria Marinas.
The eight-week project to upgrade 85metres of visitor berthing is already underway.
The work involves installing modern steel-framed systems with new electrical and water connections. Guernsey Ports said it should all be done by early May.
Work will then start to replace the ‘U’ pontoon for local boat owners.
That is expected to be finished by the end of next month.
Walcon Marine is working with Guernsey Ports on the project, with Guernsey Metals replacing the steel wall guides.
Kieran Higgs, Head of Port Operations, said these sections are the highest priority due to the significant wear they experience.
“These are the highest priority pontoons for replacement this spring, as they’re showing the most wear and tear,” he said.
“These pontoons date back to the 1970s and have reached the end of their design life. This will provide secure berthing and modern facilities for boat owners for decades to come.”