Seattle is undergoing a major transformation—and at the center of it all is the One Seattle Plan. This forward-thinking initiative is designed to guide how the city grows over the next several decades, shaping everything from housing density to transportation and sustainability. The One Seattle Plan reimagines zoning, land use, and urban development to better support a diverse, growing population and address the region’s housing challenges.
In this article, we’ll break down the most important elements of the One Seattle Plan, highlight the latest zoning changes (including those impacting ADUs and middle housing), and explain what these updates mean for buyers, sellers, investors, and builders across the Greater Seattle area. Whether you’re looking to develop property, purchase a home, or understand where Seattle is headed, the One Seattle Plan is the roadmap you need to know.
Understanding the One Seattle Plan
Launched in early 2025, the One Seattle Plan serves as the city’s updated Comprehensive Plan, guiding growth and investment strategies for the next 20 years and beyond. Mayor Bruce Harrell’s administration emphasizes affordability, diversity in housing options, and the creation of livable communities. The plan aims to increase Seattle’s housing capacity by 330,000 units, focusing on integrating new housing types into various neighborhoods to foster inclusivity and meet the demands of a growing population.
Key Components of the One Seattle Plan
- Expansion of Housing Options: The plan introduces diverse housing types, including duplexes, triplexes, and fourplexes, into areas previously zoned exclusively for single-family homes. This shift aims to provide more affordable and varied housing choices, promoting economic and racial diversity within neighborhoods.
- Transit-Oriented Development (TOD): By focusing development around major transit hubs, the plan seeks to enhance accessibility and reduce reliance on personal vehicles. This approach supports sustainable growth and aligns with environmental goals.
- Neighborhood Centers and Urban Villages: The plan designates specific areas as neighborhood centers or urban villages, encouraging mixed-use developments that combine residential, commercial, and recreational spaces. This strategy aims to create vibrant, walkable communities with easy access to amenities.
Recent Zoning Updates and Their Impact
To align with the One Seattle Plan and state legislation such as House Bill 1110, Seattle has implemented several zoning updates affecting residential areas:
- Neighborhood Residential Zones: Formerly known as single-family zones, these areas now permit the construction of multiple housing units per lot. The updated zoning allows for increased density, enabling the development of various housing types, including accessory dwelling units (ADUs) and middle housing options.
- Floor Area Ratio (FAR) Adjustments: Revised FAR standards provide developers with greater flexibility in building design, facilitating the construction of larger and more diverse housing units while maintaining neighborhood character.
- Height and Lot Coverage Regulations: Modifications to height limits and lot coverage requirements aim to balance the need for increased housing with considerations for light, air, and open space, ensuring that new developments complement existing community aesthetics.
Implications for Real Estate Stakeholders
These zoning changes present both challenges and opportunities for various stakeholders:
- Homebuyers: With a broader range of housing types available, buyers can explore options that align with their preferences and budgets. Neighborhoods that were previously limited to single-family homes may now offer more diverse and affordable choices.
- Sellers: Understanding the evolving zoning landscape can inform sellers about the potential value of their properties. Properties that can accommodate new housing types may attract a wider pool of buyers.
- Investors and Developers: The increased density allowances and diverse housing options open up new avenues for investment. Developers can capitalize on the demand for varied housing types, particularly in transit-oriented and urban village areas.
- Builders: Revised regulations offer greater flexibility in design and construction, allowing builders to innovate and meet the diverse needs of the market while adhering to updated standards.
Navigating the Changes with Professional Guidance
The complexities of Seattle’s evolving real estate landscape necessitate informed decision-making. Engaging with a knowledgeable real estate professional can provide valuable insights into market trends, zoning regulations, and investment opportunities. As an experienced realtor, I am committed to assisting clients in understanding and navigating these changes to achieve their real estate goals.
The Bottom Line
Seattle’s commitment to accommodating growth through thoughtful planning and zoning reforms is reshaping its real estate market. The One Seattle Plan and subsequent zoning updates aim to create a more inclusive, sustainable, and accessible urban environment. For those involved in buying, selling, investing, or building, staying informed and seeking professional guidance are essential steps to successfully navigate this dynamic landscape.
What Do Zoning Changes Mean for You? Let’s Find Out
Thinking about buying, selling, or investing in Seattle’s evolving real estate market? With major changes underway—like the new zoning laws, increased support for ADUs, and the city’s long-range One Seattle Plan—now is the time to align your strategy with where the market is headed.
I’m Emily Cressey, a seasoned Seattle Realtor with Keller Williams Greater Seattle and a real estate investor since 2002. I specialize in helping buyers, sellers, and investors make smart, confident decisions in every kind of market—including this one.
If you’re considering a move, downsizing, developing a property, or exploring how these zoning updates might affect your home’s value or potential, let’s connect. I’ll guide you through your options, help you avoid costly mistakes, and create a clear, actionable plan tailored to your goals.
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