What Size Boat Dock Do I Need? Boat Dock Size and Dimensions Guide

If you’re a waterfront homeowner and also have a boat, a boat dock is a useful feature that keeps your boat close by and enables easy access to the water. It’s important to have the right-sized boat dock for the safety and security of your boat, as well as the longevity of the dock. Take a look at some of the things to consider when deciding on the right size boat dock.

What Is the Standard Boat Dock Size?

As a rule of thumb, boat docks should be a minimum of two-thirds the length of your boat for small and medium boats, and at least the length of the boat for large and mega boats. Standard boat docks range in length from 10 to more than 50 feet long and four to 20 feet wide, depending on the size and number of boats the dock will accommodate. Docks used strictly for mooring a boat tend to be shorter than docks that are also designed to be used for fishing or sunbathing.

Boat Dock Size by Boat Length

Your boat length is a key deciding factor in finding the right boat dock length. The dock needs to be long enough to moor the boat with enough surrounding space to maneuver the boat into place. Here are some common boat sizes and the average dock sizes needed.

Small Boats

Small boats are less than 16 feet long and include non-powered boats like kayaks and canoes as well as small fishing or pleasure boats. Small boats can be moored to a dock that’s 10 to 20 feet long and four to eight feet wide. 

Medium Boats

Boats that are 16 to 25 feet long, including sailboats and power boats, need a little more dock space. A dock that’s 20 to 30 feet long and six to 10 feet wide is a good size for a medium-sized boat. 

Large Boats

Boats with a length of 25 to 50 feet need a larger, sturdier dock to accommodate their extra weight and length. A dock that’s 30 to 50 feet long and eight to 12 feet wide can handle the added stress of a large boat and remain stable and sturdy.

Mega Boats

Mega boats, like yachts, exceed 50 feet in length and aren’t commonly found on residential waterfront docks. Docks for mega boats should be more than 50 feet long and 10 to 20 feet wide and often need significant reinforcement and special construction to handle the weight of a mega boat. 

How to Measure the Right Size Boat Dock

A big factor in the cost to build a boat dock is how big the dock is. The part of the dock to measure is where the boat will actually be tied up, which may run parallel or perpendicular to shore, depending on the dock configuration. Your dock may also include a walkway to reach the area you tie your boat to, which will add to the total cost. It’s important to construct a dock that’s big enough for how you’re going to use it, since too much stress on a too-small dock will cost you plenty in the cost of boat dock repair from premature wear and tear.

Factors That Influence Boat Dock Size

The right size boat dock depends on a wide variety of factors. Take a look at some of the things that determine the right size boat dock for your needs.

Number of Boats

If you’re planning to moor multiple boats to your dock, you need to make sure the dock is large enough to handle the length and weight of each boat. Depending on how the dock is configured, you may need to add length in addition to extra mooring space on either side of the dock.

Boat Weight

Heavy boats will put more stress on your dock, so the dock needs to be big enough to take the weight of the boat without compromising the structural integrity of the dock. You may also need to reinforce or wrap dock pilings to prevent damage and extend the dock’s longevity. 

Shoreline Accessibility

Dock size will also depend on the specifics of your shoreline. Water depth, normal wind and current patterns, the presence of a seawall, and other environmental concerns will all play a part in how big your dock needs to be and how and where it can be placed. For example, if your shoreline is too shallow to accommodate your boat, you’ll need to place the dock further out to avoid damaging your boat. 

Dock Configuration

The type of docks and how they’re configured will affect how big they need to be. A straight dock can often be smaller than an L-shaped, T-shaped, or U-shaped dock, all of which require more material when being constructed. 

Building Codes

Waterfront communities often have specific regulations regarding boat docks and their construction. Always consult with your local building authority or environmental management division for any guidelines, codes, and regulations you need to follow when building a dock. 

What to Do if You Have the Wrong Boat Dock Size

If your dock is too small for your boat or you’re looking to install a new dock, a local deck builder or boat dock builder can help you construct the right dock for your property. A too-small dock can damage your boat and experience more wear and tear than necessary, as well as experience structural failure over time, requiring you to repair your dock. A properly sized dock is a crucial part of enjoying your waterfront property and keeping your boat safe and secure.