What a dock has to survive in Northeast Florida
A dock here is not a deck that happens to be over water. It sits in a brackish tidal system that works on it constantly. The tide moves several feet twice a day, so the structure is alternately submerged, exposed and splashed. Marine borers are active in the salt wedge that pushes up the St. Johns and into the Intracoastal. Summer brings afternoon storms and a hurricane season that runs to the end of November. Boat wake arrives from the channel all day.
Everything about the way a dock is built in this region answers one of those conditions. Pilings are driven deep enough that the surrounding soil, not a footing, carries the load. Hardware is hot-dip galvanised or stainless so it survives the splash zone. Framing timber is pressure-treated to a retention rated for the water it will sit in — the specification for a piling permanently in brackish water is not the same as for a deck ledger ten feet up the bank. Decking is fastened so that boards can be lifted and replaced individually rather than destroying a run to change one plank.
Choosing a dock layout
The three shapes cover nearly everything built on residential water in this region.
A straight dock is a walkway that ends where the water is deep enough. It is the least expensive option per foot and the right answer where you mostly need access and a place to tie up alongside.
An L-shaped dock adds a platform at the end, running parallel to the shoreline. It gives you a protected side to bring a boat into and somewhere to stand that is out of the walkway. It is the most common upgrade from a straight dock.
A T-shaped dock puts the terminal platform square to the walkway, extending both directions. It gives you two approach sides and the most usable deck area for the length of walkway you pay for. It is the usual choice where a lift will go on one side and the other stays clear for a second vessel or for swimming.
Beyond the shape, the decisions that matter most are terminal platform size, whether to cover it, where to put the lift, and whether the walkway needs railings — which depends on who uses it and how high above the water it sits.
Where the cost actually goes
Most of the cost of a dock is below the deck boards. Pilings and the labour and equipment to drive them are the single largest line on nearly every project, and the number of pilings is set by the length you need and the loads you intend to carry. Framing is next. Decking — the part everyone looks at — is usually a smaller share than people expect, which is why upgrading the walking surface to composite is often a more modest step than it sounds.
Longer does not mean better. The right dock is the shortest structure that reaches water you can actually use at low tide, framed for what you will put on it. We would rather talk you out of thirty unnecessary feet than sell them to you.