Stock photo (Unsplash), not a job photo.
Fixed dock, pier, catwalk or platform?
- Catwalk / pier: a narrow walkway out to deeper water, common across marsh and shallow flats.
- Fixed platform: a wider deck on pilings for boarding and sitting. Works best where the tide range is small.
- Ramp + float: a gangway down to a floating dock that rises and falls with the tide.
- Boat lift: often added on the same pilings. See boat lifts.
What drives the price
| Job | Typical Long Island range | What drives it |
|---|---|---|
| New dock (fixed or floating), all-in | $1,000 – $2,500+ / ft | One early-2026 North Shore estimate. Simple catwalks run lower and big platforms higher. Get every quote itemized. |
| Decking: pressure-treated vs composite vs tropical hardwood | Material is the swing factor | Ask for the decking line item separately. Southampton bans chemically treated wood. |
| Pilings | Per piling | Barge access, water depth and piling length drive the price more than the dock size does. |
| Permits | Separate line item | Most new docks need a town permit plus DEC and often Army Corps review. |
Local dock rules worth knowing
- Brookhaven: one dock per lot, 4 ft max width, kept 10 ft off the seaward extension of property lines, and at least 4 ft above grade with open-grate decking over wetlands. Details
- Islip: on Town-owned bottom, new docks can't go past 4 ft of water depth at low water. Details
- Southampton: no chemically treated wood. Seasonal docks out by December 1. Details
- Oyster Bay: neighbors get notice, and anything past your property line goes to the Town Board. Details
Town permit rules
Dock Building & Repair help is available on every tidal shoreline in Nassau and Suffolk. After DEC, the local permit comes from your town, city, village or Town Trustees, and the rules differ a lot. Start with yours:
Frequently asked questions
Do I need a permit to build or rebuild a dock on Long Island?
Usually. New docks generally need a town (or village/Trustees) permit plus DEC review, and often Army Corps review. Some towns set specific standards. Brookhaven, for example, limits residential docks to one per lot, 4 feet wide, kept 10 feet off the seaward extension of the property lines, and at least 4 feet above grade with open-grate decking over wetlands.
What decking lasts longest on a Long Island dock?
Composites and tropical hardwoods outlast pressure-treated pine, but cost more up front. In the Town of Southampton, chemically treated wood isn't allowed in docks, bulkheads or pilings at all.
How far out can my dock go?
It depends on the town. In Islip, a new fixed dock on Town-owned bottom can't extend past 4 feet of water depth at low water, and no structure may occupy more than a quarter of the waterway's width.
Can you just replace the decking?
Often. If the pilings and framing are sound, redecking is the cheapest refresh. A contractor should check pilings at the waterline, where rot and shipworm do their damage.
Sources
Related services
- Bulkhead Replacement: Full waterfront bulkhead replacement in vinyl, timber or steel sheet pile, in place or landward, often raised up to 18 inches under DEC's general permit.
- Bulkhead Repair: Sinkholes behind the wall, leaning sections, rotted wales and cap boards, failed tie-backs, and refacing (resheathing) an old wall.
- Floating Docks: Modular and timber floating docks, gangway ramps and kayak or jet-ski floats sized for your bay's tide range.
- Boat Lifts: Four-post, cradle and elevator boat lifts sized to your boat, with the pilings and permits they need.
- Piling Replacement & Repair: Replacing or jacketing marine pilings weakened by shipworm, rot, ice or storm loads, under docks, lifts and bulkheads.
- Seawalls, Revetments & Storm Repair: Nor'easter and storm-surge damage, rock revetments, seawalls and living-shoreline alternatives where a bulkhead isn't allowed.