Docks Knowledge Quiz

Most residential docks run 100-300 per linear foot depending on materials. A 40-foot dock with aluminum framing and composite decking often lands between 6,000 and 12,000 installed, before permits and extras.

Materials drive the spread: pressure-treated wood is cheapest, composite decking adds 30-50%, and aluminum framing can double the price. Water depth, bottom conditions, and pile requirements add more on top.

Budget for permit fees, engineering stamps, utility locates, and possibly a submerged land lease. Dredging or removing an old structure can each add thousands to the project.

A boat lift typically adds 5,000-15,000 installed depending on size and drive type. Vertical lifts cost more than cantilever lifts but suit shallow water better.

Driven piles run roughly 150-400 each installed, and most docks need 4-10 piles. Wood piles are cheaper than steel or aluminum but have a shorter life in saltwater.

Floating docks suit deep water, soft mud bottoms, or water levels that swing several feet. Fixed docks work best where the bottom is firm and the water depth is stable.

Aluminum and composite decking outlast wood: composite runs 20-25 years and aluminum 20-30 years. Pressure-treated pine may need replacement after 10-15 years in saltwater.

Match the choice to salt exposure and budget: wood is cheapest but rots and splinters, composite resists rot at a moderate price, and aluminum costs the most but lasts decades with low maintenance.

Pipe docks, built from galvanized steel pipe with a small platform, suit shallow low-traffic waterfronts and cost less than full pile docks. They wobble more and are not ideal for heavy boats or deep water.

If your waterway freezes or takes winter storms, a removable seasonal dock avoids ice damage but adds annual setup and storage costs. A permanent aluminum dock lasts 20-30 years but needs ice protection features.

Ask whether they pull the waterfront permit, who handles the submerged land lease, and whether federal review applies to your waterway. Permits can take 3-9 months, so confirm this before ordering materials.

They should carry general liability insurance, workers compensation, and often a state contractors license. Ask for proof of recent waterfront projects and references you can call.

Ask how deep piles will be driven, often 10-15 feet into the bottom, what diameter, commonly 10-12 inches, and the spacing, usually 8-10 feet. Shallow piles in soft mud are a red flag.

Ask how many docks they have built on your lake, river, or bay and what bottom conditions they encountered. Local experience matters because sediment type, currents, and ice vary widely from one waterway to the next.

Get the warranty in writing: aluminum framing often carries 20-year coverage, decking 10-25 years, and labor 1-5 years. Confirm what is excluded, such as ice damage or storm debris.

Depth and bottom type determine pile length, dock height, and whether you need a floating design. A simple survey can save thousands versus discovering soft mud after piles are ordered.

Confirm your deed, survey, and any easements so the dock stays on your property and inside the permitted footprint. Neighbors and authorities can force the removal of an encroaching dock.

Inspect the spec sheet for stainless steel or hot-dipped galvanized hardware rather than electroplated fasteners. Rust-streaked joints are the first sign of cheap hardware failing in saltwater.

Keep the permit, as-built drawings, pile records, and warranty certificates. These matter for insurance claims and when you sell the property.

Walk the site, check the water depth at your dock location, and compare quotes line by line for piles, decking, and hardware. A low quote often hides undersized piles or untreated lumber.

Low bids often use untreated wood, undersized piles, or skip the permit and engineering. Verify the materials list and permit plan before accepting a price 30% below other quotes.

You can face fines, forced removal, and trouble at resale. Permits also protect you by setting setbacks and construction standards for your shoreline.

Galvanized steel corrodes faster in saltwater than aluminum, so framing may fail in 10-15 years. Aluminum costs more upfront but is the standard for long saltwater life.

Question add-ons like premium lighting packages, oversized decks, and unnecessary dredging. Ask whether each extra is needed for your boat and water depth rather than builder margin.