Government

Middle Housing

On June 23, 2025, the City Council approved new rules that allow more middle housing in Tukwila. These homes—such as duplexes, townhomes, cottage housing, and courtyard apartments—are now allowed in most residential neighborhoods.

Middle housing fills the gap between single-family houses and large apartment buildings. They are similar in size and scale to single-family homes but create more housing choices for the community.

These updates help address rising housing costs and limited supply. Nearly half of Tukwila renters and a quarter of homeowners are considered cost-burdened (spending more than 30% of income on housing). By encouraging middle housing, Tukwila is adding options for residents, supporting local businesses, and building walkable neighborhoods.

What This Means for You

Thinking about building? You may be able to add a duplex, townhome, or accessory dwelling unit (ADU) on your property.

Concerned about neighborhood change? Middle housing is designed to fit in with the look and feel of existing homes.

Interested in buying? Middle housing may create more ownership opportunities through tools like condominiums or unit lot subdivisions.

Frequently Asked Questions

Will middle housing make housing more affordable?
New homes are never “cheap,” but middle housing can be more affordable than single-family homes since each unit uses less land. Adding more housing overall also helps lower costs by reducing scarcity.

Can middle housing be sold as individual units?
Yes. Multiple units on one property can often be sold separately using processes like condominiums or unit lot subdivisions. See the Tukwila Middle Housing Handbook for details.

How will it affect my neighborhood?
More homes mean more neighbors to support businesses, schools, and community life. Middle housing also gives people more options if their needs change but they want to stay in Tukwila.

How can I add units to my property?
Many lots now allow more options. You could:

  • Convert part of your existing house into an additional unit
  • Add a detached ADU in your backyard
  • Build new middle housing (such as a duplex or cottage cluster)

See the Community Residential District Development Standards and Residential Design Guidelines below for requirements.

Key Resources

Learn More About State Law and Middle Housing