Floating Homes vs Houseboats in Seattle: What’s the Difference?

Floating Homes vs Houseboats in Seattle: What’s the Difference?

Floating homes and houseboats in Seattle offer one of the most unique living experiences in the country — the opportunity to live directly on the water instead of simply admiring the view from shore.

While they may look similar at first glance, floating homes and houseboats are very different types of properties. From ownership structure and moorage to registration and taxes, understanding the differences is essential for anyone considering waterfront living on Lake

Union or Portage Bay.

Here’s a clear breakdown of how these two iconic Seattle housing options compare.

Setbacks, Lot Size, and Spacing

One of the easiest ways to spot the difference between a houseboat and a floating home is the spacing between properties.

Houseboats typically sit in recreational marinas where spacing depends on the size of the slip. The distance between neighbors is usually the width of a finger dock or bumper, and there are generally no formal setback requirements beyond whether the vessel fits within the marina slip.

Floating homes, on the other hand, are located in designated floating home communities. These homes must follow specific spacing rules that include required setbacks from neighboring homes, the dock, and the navigation channel.

Both floating homes and houseboats share one key regulation in Seattle:

Maximum height:

All floating residences are limited to 18 feet above the waterline.

Placards and Registration: KCA vs FOWR

When walking along Seattle’s floating home docks or houseboat marinas, you may notice placards attached to the homes. These registrations help identify each structure and track property records and taxation.

KCA Placards (Floating Homes)

KCA stands for King County Assessor.

These metal placards began appearing on floating homes in the early 1980s. Roughly the size of a motorcycle license plate, each placard displays a unique identification number assigned by King County. For floating homes, the KCA number functions as the legal property identifier, similar to a parcel number for land-based homes. It allows the county to assess property taxes and track ownership transfers.

FOWR Placards (Houseboats)

FOWR stands for Floating On-Water Residence.

This designation was introduced in 2017 specifically for houseboats. The registration created additional legal recognition for liveaboard vessels, particularly in response to changes in the

Shoreline Management Act, which emphasized public access to shorelines.

The FOWR designation helps establish houseboats as legitimate residential structures while also creating a tax identification system for ownership transfers.

Unlike KCA placards, FOWR placards are:

• bright yellow

• made of plastic

• required to be visible from the dockside

Structural Differences: Houseboat vs Floating Home

Although both types of homes float, their construction and infrastructure are quite different.

Houseboats

A houseboat is technically a vessel.

Key characteristics include:

• marine hull construction

• mooring ropes and docking lines

• black water holding tanks

• beam measurements (like boats)

• electrical capacity typically lower than traditional homes

• located in recreational marinas

Houseboats retain many characteristics of boats, even when used as permanent residences.

Floating Homes

A floating home is a residential structure built on flotation systems rather than a boat hull.

These homes typically rest on:

• concrete flotation tubs or log flotation systems

• air-filled flotation barrels

Floating homes connect to shore utilities including:

• city sewer systems

• standard electrical service

• water and garbage services

They are secured to docks using moorage arms or chains and are located within dedicated floating home communities along Lake Union and Portage Bay.

Monthly Costs: Liveaboard Fees vs HOA Dues

Both floating homes and houseboats involve monthly costs associated with moorage and shared infrastructure.

Houseboat Costs

Houseboats typically pay:

• monthly slip rent

• liveaboard fees

• water and garbage services

These combined costs generally average around $1,000 per month, depending on the marina.

Floating Home Costs

Floating homes typically pay homeowner association dues that cover shared infrastructure such as:

• water

• sewer

• garbage

• dock insurance

• reserve funds for dock repairs

These dues usually range from $800 to $1,000 per month, depending on the dock community.

Why Seattle’s Floating Communities Are So Unique

Seattle is one of the only major cities in the United States with established floating home communities, particularly on Lake Union and Portage Bay.

These neighborhoods combine waterfront living, city access, and a strong sense of community that has defined Seattle’s floating lifestyle for generations.

Working With a Floating Home and Houseboat Specialist

Buying a floating home or houseboat involves very different considerations than purchasing traditional real estate, including moorage agreements, marine inspections, registration requirements, and specialized financing.

For buyers navigating this unique market, working with an experienced specialist makes a significant difference.

Molly Cartwright is widely recognized as one of Seattle’s leading floating home and houseboat real estate experts. With deep knowledge of Lake Union, Portage Bay, and the region’s floating home communities, Molly helps buyers and sellers navigate the unique details of floating property ownership with confidence.

For those considering living on the water in Seattle, connecting with a specialist who understands these properties inside and out is an essential first step.

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