You will likely need a permit to build a new dock or add to an existing one, especially if it's a permanent structure. Permit requirements vary by location, as they are typically set by local municipalities, counties, or cities rather than states. You should check with your local government or building department to determine what paperwork is required before you begin. In many areas, you may need multiple permits, including general construction permits and those designed to protect local marine life. Additionally, if you are part of a homeowner's association (HOA), they may have their own rules regarding docks, such as minimum distances between neighboring docks. It's best to check with all relevant authorities (city, county, HOA) to ensure you are in compliance. A professional dock builder can often handle the permit-pulling process for you.

The average cost of a new dock piling is $950, including the labor to install it. Dock piling costs can range from $300 to $1,600. You can save money by trying to repair a damaged piling instead of replacing it. On average, repairing a boat dock piling costs $450, with prices ranging between $200 and $700.

To maintain a dock, perform regular inspections for structural issues, clean away debris, and apply a sealant to wood components. This protects the dock from water damage and prevents premature wear and structural damage.

Cedar wood is the best choice for a hardwood dock, as it is rot-resistant and does well in the water. Pressure-treated pine and spruce are two other solid options. Alternately, composite or waterproof plastic are materials commonly used for docks, and are frequently used in prefabricated kits.