For a generation, most Seattle residential lots were limited to a single house. Washington's 2023 middle-housing law changes that — and almost no permit firm has caught up. Here's the plain-language version of what the law allows, and how to tell what your specific lot supports today versus what's still rolling out.
What the law actually allows
The state sets a floor, not a ceiling. Seattle has to allow more homes per lot, and the city is implementing it through its zoning and comprehensive-plan updates.
- Up to four homes on most residential lots
- Up to six near frequent transit or when affordable units are included
- Reduced parking requirements
Current vs. pending — why it matters
Because Seattle is still rolling out its implementing zoning, what's permittable today can differ from the headline. We assess your specific parcel against the rules actually in effect, so you plan around reality rather than a press release.
Ownership and configuration choices
Middle housing brings real decisions that shape both the permit and your eventual sale or rental.
- Unit lot subdivision so each home can be sold separately (fee-simple)
- Shared vs. separate utilities
- Massing, setback, and design standards
The building types we permit
Stacked flats, attached townhomes, and detached cottage clusters each behave differently under the code. We match the type to your lot, budget, and exit plan, then build the submittal around it.
Common questions
How many units can I really build?
Most residential lots now support up to four homes, and up to six near frequent transit or with affordable units — but the exact number depends on your lot and Seattle's current implementing zoning. We give you a parcel-specific answer.
Can each home be sold separately?
Often yes, through unit lot subdivision, which creates fee-simple lots for each home. We plan the subdivision alongside the building permit so your options stay open.