The Rise of Accessory Dwelling Units (ADUs) in the Greater Seattle Area: What Homeowners Need to Know



As housing affordability challenges persist in the Seattle-Tacoma region, Accessory Dwelling Units (ADUs) have emerged as a practical solution for homeowners seeking to maximize their property's potential. These self-contained living spaces, either attached (ADUs) or detached (DADUs), offer flexibility, additional income, and contribute to the region's housing diversity. 

Understanding ADUs: Definitions and Types

An ADU is a secondary housing unit on a single-family residential lot. They come in two primary forms:

  • Attached Accessory Dwelling Units (AADUs): These are integrated within the primary residence, such as basement or attic conversions. 
  • Detached Accessory Dwelling Units (DADUs): Also known as backyard cottages, these are standalone structures separate from the main house. 

Both types must include essential living facilities like a kitchen, bathroom, and sleeping area.

Recent Legislative Changes Favoring ADU Development

King and Pierce County and Washington State have implemented several reforms to encourage ADU construction: 

  • Relaxed Zoning Regulations: Seattle's 2019 legislation removed owner-occupancy requirements and parking mandates for ADUs, making it easier for homeowners to build them.
  • Streamlined Permitting: The city's ADUniverse platform offers pre-approved DADU designs, expediting the permitting process to as little as 2-6 weeks.
  • Statewide Incentives: Washington State caps impact fees for ADUs at 50% of those for primary residences and prohibits local governments from requiring street improvements as a condition for ADU approval.

Benefits of Building an ADU

  1. Additional Income: Renting out an ADU can provide a steady revenue stream. In Seattle or Tacoma, DADUs can command monthly rents between $2,000 to $3,500, depending on size and location. 
  2. Increased Property Value: Adding an ADU can boost your property's value by 10–20%, enhancing equity and market appeal.
  3. Flexible Living Arrangements: ADUs offer versatile solutions for housing extended family, creating home offices, or providing private spaces for guests. They may even be a short term rental option as well.
  4. Sustainable Urban Development: By increasing housing density without expanding urban sprawl, ADUs contribute to more sustainable and walkable neighborhoods.  Avio Homes

Considerations for Homeowners

  • Construction Costs: Building an ADU can range from $100,000 to $300,000, depending on factors like design, materials, and site conditions. The size and scope of your ADU should be commensurate with your existing property. 
  • Financing Options: Homeowners can explore financing through home equity loans, cash-out refinancing, or specific grants aimed at promoting affordable housing. 
  • Regulatory Compliance: It's essential to adhere to local building codes and zoning regulations. Seattle's ADUniverse platform provides resources and guidance for prospective ADU builders. 

Take the Next Step

If you're considering adding an ADU to your property in the Greater Seattle-Tacoma market, it's crucial to navigate the process with expert guidance. I can connect with you the right contractors or steer you in the right direction for county resources. Call me at (206) 643-8845 or reach me at https://erikmolzen.bhhsnw.com/ 


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Location: Seattle, WA, USA

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