Jetty vs Dock – What's the Difference?

Ever stood by the water and wondered if you're looking at a jetty or a dock?

If you've spent time around boats or waterfront properties here in Australia, you'll know these terms get thrown around a lot. But do you actually know the difference between a jetty and a dock? I run into this question often, and it can get confusing pretty quickly. Let's clear that up right now.

What exactly is a jetty?

A jetty is typically a structure built from the shore out into the water. They're usually fixed, solid, and can be constructed from materials like timber, concrete, or steel. Jetties serve as walkways for people to reach boats moored offshore, protect shorelines from erosion, and provide safe areas for recreational fishing. If you're interested in exactly how versatile a jetty can be, check out my detailed article about what a jetty can be used for.

One good example of a jetty in action is the famous Busselton Jetty here in WA. It's one of Australia's longest wooden jetties, which I've talked more about in my blog on how long the Busselton Jetty is.

Alright then, what’s a dock?

A dock, on the other hand, is usually a floating or fixed platform built specifically for mooring boats. Unlike a jetty, docks don't necessarily extend far from the shore, but they can. Floating docks rise and fall with the tide, making them ideal for areas with significant tidal variation. I particularly love floating docks because they're great for boating communities, providing easy access regardless of the water level. JMC Australia even specialises in creating floating jetties if you're considering installing one yourself.

So, what sets jetties apart from docks?

The main difference boils down to function. Jetties tend to be fixed structures primarily used for access or shoreline protection, while docks focus heavily on mooring boats. But there's more to it. Jetties are usually longer and can handle rougher waters. Docks typically cater to calmer areas like lakes or sheltered bays, making them ideal for recreational boating.

I've noticed people sometimes use "dock" and "jetty" interchangeably, but knowing the difference can really help when planning construction or maintenance work. Speaking from experience, you’ll definitely want to consider professional jetty design consulting before starting any marine construction project.

Is there a cost difference?

Absolutely. The cost of building a jetty versus a dock can vary significantly depending on materials, size, and location. Jetties usually require more robust construction because they're exposed to harsher conditions. Curious about the costs involved? I've got an article dedicated just to the question of how much it costs to build a jetty. It's worth a read if you're budgeting.

Materials matter too

The materials used for jetties and docks can overlap, but the choice can make or break your structure’s lifespan. Timber is popular for its classic aesthetic but might need more upkeep, especially in saltwater. Concrete and steel are durable but more expensive upfront. For help deciding what's best for you, get in touch. I’m always happy to talk about the options available for your specific conditions.

Maintaining your jetty or dock

Regardless of your choice, regular maintenance is key. Australia's harsh marine environment can quickly degrade structures, making timely repairs essential. For more information about this, here's a handy guide that explains why maintenance is crucial for these marine structures.

Environmental considerations

As an Aussie who loves the coast, protecting our environment is a priority. Jetties and docks can impact marine life and water quality if not properly planned and built. Structures should always be designed to minimise environmental disturbance. If you're environmentally conscious (which I hope you are), I highly recommend reading this piece on combating wave erosion.

Wrapping up your waterfront decision

Choosing between a jetty and a dock isn't just about personal preference—it's about location, purpose, and environmental responsibility. Whatever you decide, make sure you consider long-term factors like cost, maintenance, and marine safety. If you're still feeling unsure, you can always reach out to me directly on the contact page and we can chat about what's best for your waterfront.

And next time you're enjoying a stroll along the water, impress your friends by pointing out the differences between a jetty and a dock. You can thank me later!