Design Scenarios for Seattle ADUs: Navigating RSL Zoning

Seattle’s RSL zoning facilitates diverse housing solutions in urban villages, allowing for innovative design scenarios that cater to various needs. These zones are designed to accommodate a mix of housing types, including single-family dwellings with attached or detached Accessory Dwelling Units (ADUs), thereby increasing density and diversifying living options.

Case Study: Attached Housing Development Consider a scenario where two homes are constructed back-to-back on a 4000 square foot lot. Each home could be designed with square footage ranging from 1400 to 1600, providing ample living space while adhering to the compact nature of RSL zones. This setup is particularly conducive to the development of attached ADUs, offering a blend of privacy and community living.

Zoning Specifications and Opportunities In RSL scenarios, the zoning regulations offer a framework for development:

1. Lot Size Variability: While standard lot sizes are set at 5000, 7200, and 9600 square feet for NR3, NR2, and NR1 respectively, exceptions permit smaller lots, particularly beneficial for ADU projects aiming for a compact footprint.

2. Density and Floor Area: The zoning allows one single-family dwelling unit per lot, with a Floor Area Ratio (FAR) of 0.5 or 2500 square feet for smaller lots, facilitating efficient space use.

3. Lot Coverage and Height Limits: Restrictions are designed to maintain neighborhood character while allowing for sufficient living space. For example, a maximum lot coverage of 35% or 1000 square feet plus additional percentages of the lot area ensures outdoor space and greenery, enhancing living quality.

Design Flexibility and Environmental Considerations RSL zoning not only promotes density but also supports environmental sustainability through tree preservation requirements and encourages the use of spaces such as garages and yards to enhance livability and community feel. Parking regulations reflect a modern, urban approach, reducing dependency on vehicles and promoting greener modes of transportation.

By incorporating ADUs into these design scenarios, homeowners and developers can leverage Seattle’s zoning to create flexible, sustainable living solutions. Whether for family use, rental income, or simply increasing property value, ADUs represent a strategic response to urban housing needs, aligning with the city’s goals for density, diversity, and sustainability​​

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