If you’re looking to build a detached accessory dwelling unit in Seattle, the city has a list of pre-approved construction plans. This can streamline the permitting process, as all you need to do is pick a plan and connect with the designer.
There are plans available in various sizes, from 288 square feet to 1000 square feet. And there are a variety of designs to choose from, so you can find one that fits your needs and taste.
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Browse the City’s Growing Catalog of Pre-Approved DADU Small Cottage Plans

Image via CAST Architecture | Cedar
The Cedar Cottage by CAST Architecture

Image via CAST Architecture | Cedar | ADUniverse
The Schooner by Fivedot Architects

Image via Fivedot Architects | Schooner | ADUniverse
The Family by Ahouse Studio

Image via Ahouse Studio | The Family | ADUniverse
Urban Cottage Prefab by Urban Cottage Seattle

Image via Urban Cottage Seattle | ADUniverse
Seattle DADU by Artisans Group

Image via Artisans Group | Seattle DADU | ADUniverse
The Sky House by Yes Architecture

Image via Yes Architecture | Sky House | ADUniverse
MOA Family ADU by Mobile Office Architects

Image via Mobile Office Architects | ADUniverse
Edge House by Bohlin Cywinski Jackson

Image via BCJ | ADUniverse
Willow Creek DADU by Shape Architecture

Image via Shape Architecture | Willow Creek ADU | ADUniverse
Abodu DADUs

Image via Abodu | ADUniverse
Abodu Studio

Image via Abodu | Studio | ADUniverse
Abodu One

Image via Abodu | One | ADUniverse
Abodu Two

Image via Abodu | Two | ADUniverse
Explore over 100 other tiny and small house designs that were submitted to Seattle’s ADUniverse. Take a look at the city’s catalog of pre-approved plans and see if one is right for you. Learn more below!
Learn more
- https://aduniverse-seattlecitygis.hub.arcgis.com/pages/gallery
- Abodu | Shape Architecture | BCJ | Mobile Office Architects | Yes Architecture | Artisans Group | Urban Cottage Seattle | Ahouse Studio | Fivedot Architects | CAST Architecture
- Browse the City’s Growing Catalog of Cottage Plans
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Dear Seattle bureaucrats,
What Is the difference between ‘pre-approved’ and regular approved?
Pretty sure no one in Seattle’s government is going to answer but it’s safe to say the answer is Verification! Same as loans, mortgages, credit card offers, etc. when that language is used. One notes clearance to start the process and the other is the final confirmation that makes it official. In other words the bureaucracy is expedited but you still have to go through the process…
Like the idea of pre approved plans. Anything to speed up the process works for me. Lets hope other cities and towns do something similar. It takes a very long time to get plan approval in many cities.