The building will include a new bridgehead entrance structure, additional car parking and trolley storage at the marina, owner Premier Marinas said.
General Manager Graham Bristowe said: “In these most testing times, this is great news for Swanwick Marina. We know that our tenants and berth-holders alike will be happy to see the continued investment on their site.”
The latest plans augment the recent expansion of the marina which has added 59 extra berths to the overall capacity.
Another key innovation has been the introduction of innovative nger pontoons which are set 700mm above water as opposed to the industry standard 500mm, to make life easier for sailors to jump on and o their boats when mooring.