Depending on the size of the dock, it can range from a few hundred dollars to tens of thousands of dollars per year. The most common factors that contribute to the cost are weather exposure, tidal fluctuations, and ice buildup/thawing. Many docks are built with features that minimize maintenance costs, such as watertight seals and coatings that resist corrosion. However, even with these features, regular inspections and occasional repairs are usually necessary.

The cost of maintaining a dock depends on the size of the dock, the materials used in its construction, and the geographical location. Generally speaking, docks require regular maintenance to ensure that they remain structurally sound and watertight. This maintenance can include regular painting or coating of the wood or metalwork, repairs to cracks or holes, and replacement of worn-out sections. The cost of repairing or replacing a dock can be significant, and it's important to factor this into any calculations about whether constructing a dock is economically feasible. In some cases, it may be more cost effective to simply replace an aging dock rather than spending money on costly repairs.