DADU/ADU Builder Seattle

As a homeowner, there may come a time when you realize your current living space no longer fulfills your needs. Perhaps you've started working from home, have elderly relatives moving in, or want to rent something out for extra income. That's where CRD Design Build, your local Seattle ADU builder, can help. We have years of experience designing and building home additions for families in Seattle, helping them obtain the additional space they need without having to leave their beloved neighborhood.

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What are Cottages and ADU's?

Cottages and Accessory Dwelling Units (ADUs) serve as secondary housing units on single-family residential properties. Primarily, they enhance existing homes by adding capacity and square footage, effectively increasing housing availability in single-family neighborhoods. Additionally, these units offer versatile benefits, such as providing ideal options for rental income or accommodating extended family members. Their multifunctional nature makes them a practical solution for homeowners looking to leverage their property for additional living space or financial gain.


Cottages or DADUs, or detached accessory dwelling units, are different in the fact that they are completely disconnected from the main home. These homes are independent structures built on the property, providing for more privacy and independence. These types of ADUs are ideal for homeowners who want a totally separate living space for visitors, tenants, or extended family members. 

The Ultimate Guide To Seattle Backyard Cottages
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Benefits of Investing in an ADU or Cottage

ADU’s and cottages provide a variety of benefits for homeowners and renters alike:


Bonus Space

ADUs and cottages provide additional space for bonus rooms such as offices, home gyms, entertainment centers, and play areas. For tenants, they act as a fully equipped living space.


Additional Rental Income

As a homeowner, you can rent out your ADUs or cottage to tenants for extra income.


Multigenerational Living

ADUs and cottages are perfect for housing grandparents, extended relatives, or college-age kids who require their own space.


Increased Property Value

Adding a cottage or ADU to your property can increase its overall value, making it a wise long-term investment.

Custom ADUs By CRD Design Build

When it comes to creating your ADU, the options are endless. You can incorporate a myriad of unique features that cater to your lifestyle needs, functionality requirements, and design preferences. Examples include transforming your unfinished basement into a luxury entertainment center, building a mother-in-law suite from the ground up, or even creating your own art studio. Also, don’t forget to include all the custom elements and designer fixtures you’ve always dreamed of.

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How Much Will Your ADU in Seattle Cost?

Estimate a realistic price range for your project.

Talk to One of Our Seattle ADU Contractors About Your Project!

Our team is here to listen to your ideas and work alongside you to bring them to life. Get in touch with us today.

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Why Choose The Design Build Method For Your ADU

Instead of choosing a run-of-the-mill remodeling contractor to build your ADU, you should consider going with a design-build firm like us here at CRD Design Build. The reason is that a design build firm will handle everything from the design and planning to the actual construction and electrical. There is no need to go back and forth between a designer, architect, and builder and risk the chances of miscommunication or delays. Furthermore, since we have control over the entire process, you can lock in a set price before any work begins.


Megan, Michael, Matt . . . have been ridiculously fantastic throughout. This is our first remodel and I'm pretty sure y'all have spoiled us with how actually enjoyable it is."

Amanda and Avinash


We loved their team approach. They listened! We couldn’t be happier with how the project turned out."


Rene and Judy


THANK YOU!!! Everyone involved in our project was a delight, gracious and kind. You have a great team."


Tee, Martin, Talisker and Macallan


We had heard all the horror stories about remodel projects gone wrong, but CRD delivered on-time, on-budget, and with beautiful high quality work."


Jen and Eric


Frequently Asked Questions About ADUs and Cottages

Can I build an ADU in Seattle?

Yes, it is legal to build an ADU on your Seattle property. However, some requirements and regulations must be followed, such as the size and placement of the structure. Our team of designers and builders will work with you to ensure your ADU meets all set requirements by the City of Seattle.

How much does it cost to build an ADU in Seattle?

The cost of building an ADU varies depending on several factors, including size, location, materials, and design. Luckily, due to our design build approach, we can provide you with a highly accurate cost estimate right off the bat. We also have a guide that overviews our tiered pricing structure and any other additional information you may need.

See Pricing Guide

How can I get started building my cottage or ADU?

To start building your ADU or cottage in Seattle fill out our online contact form. We’ll get things kicked off with a discovery call where we’ll learn more about what you are looking to achieve and then move on to a showroom tour where we review actual photos of your space. Here is a full breakdown of our process:

Looking for ADU Builders Near Me in Seattle? Contact CRD Design Build Today