Your Seattle ADU, simplified

We’ve reimagined the experience of building a custom ADU in Seattle to save you time and money.
Book a Consultation
Save money and time on your construction project

200+ completed projects

ADUs

Cedar-Sided ADU Adds Space for Hosting and Working

ADUs

Light-Filled ADU for In-Laws and Family Flex Space

ADUs

Modern ADU Delivered with Transparent, Streamlined Process

ADUs

The Ultimate ADU for Senior Living and Work-from-Home

ADUs

Cozy Scandinavian-Inspired ADU Doubles as a Workspace and Guesthouse

ADUs

This Burlingame ADU is the Perfect Blend of Comfort and Space Efficiency

ADUs

Santa Clarita Attached ADU for Multigenerational Living

ADUs

ADU in Alameda HOA Adds Flexible Space for the Family

ADUs

Customized Craftsman ADU for Multi-Generational Family

ADUs

Los Angeles Garage Conversion ADU

Design and build the smart way

Save money

with multiple competitive bids

Get three bids from providers in our network. Multiple bids means you get competitive pricing.
Get your estimate
Get your estimate

Save time

by accessing all the pros you need, in one place

We connect you with vetted architects, engineers and contractors in Seattle to save you the time and hassle of piecing a team together yourself.
We connect you with vetted architects, engineers and contractors.
Book a consultation
Book a consultation

Avoid headaches

by connecting with trusted pros

Our network of providers is highly vetted and invite-only. We track how our pros perform on timeline and budget, keeping only the top providers on our platform.
Our providers are highly vetted, and we continuously track performance on timeline and budget.
Start your project
Start your project

“Working with the designer we found through Cottage was really collaborative, and we achieved exactly what we wanted. It felt like we were a team.”

Kathy, homeowner
Sophia, Designer
Gabriel, Contractor
Wyatt, Structural Engineer
Christian, Civil Engineer

"Working with Cottage was a fantastic experience. The designer and contractor they matched us with stayed on budget and on time. We love the result!"

Angela, homeowner
Evelyn, Designer
Aaron, Contractor
Jordan, Land Surveyor

“I had a great experience with Cottage. It was great to be able to manage everything for my project online.”

Jocelyn, homeowner
Sophia, Designer
Dylan, Structural Engineer
Javier, Contractor
Chloe, Energy Consultant

“Cottage was a great solution for our project. We liked that we could find all the providers we needed on the Cottage platform.”

Bob, homeowner
Elijah, Designer
Aaron, Contractor
Joseph, Civil Engineer

Streamlined process

Feasibility
Understand what’s possible on your property. Get preliminary guidance on budget and timeline.
Design & Permit
Choose from a curated list of architects best fit for your project. Work directly with them on design and permitting.
Bid
Get competitive bids from vetted ADU contractors. Choose the builder that’s right for your project and budget.
Construction
Your contractor will bring your ADU to life. Track their progress and make payments through our digital platform. (edited)

Already have a set of plans?

Upload them and we’ll get you multiple bids.
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Learn more
flexible space
generations
family time
rental income