Seattle-Area Basement Remodeling

Create more space for your family, a dedicated space for guests, or turn your basement into an accessory dwelling unit (ADU). Sometimes called in-law apartments, ADUs can earn you rental income or make intergenerational living more comfortable.

See All Basement and ADU Projects

Complete Basement Transformations

Make your basement a natural extension of your home.

Beyond increasing the usable square footage of your home, a basement renovation gives you the opportunity to waterproof and seismically retrofit your foundation, keeping your home on solid footing. Our team can also help you relocate or improve staircases, increase natural light, improve drainage, or add an outside entrance.

The Ultimate Guide to Seattle Backyard Cottages

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Basement Renovations


Dig-Downs & Lift-Ups

Get the height and light you want by digging down or raising your home onto a new foundation.


Daylight Basements

Convert a traditional basement into a daylight basement with full-size windows that brighten the space.


Bathroom Additions

Add or renovate a bathroom in your basement, including reworking of ducting and plumbing.



Create a code-compliant in-law apartment with soundproofing, separate entrances, dedicated electrical panels, and more.

How Much Will Your Basement Remodel or ADU Cost?

Estimate a realistic price range for your project.

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Client-Centered Design

Basement and ADU solutions that work for your life.

When it comes to an unfinished or outdated basement, your possibilities are endless. Talk to our team about your vision and together we’ll collaborate on ways to make the space work for you, whether it’s adding a master suite, playroom, entertainment space, office, or all of the above. You may find that digging down or lifting up your home gives you all the space you need without taking on the cost of a second-story addition.

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Design-Build Methodology

See your vision come to life.

As a design-build firm, we work with you from conception to construction of your basement or ADU remodel. That means we can show you cost estimates at every major step in the design phase and lock pricing before any work begins. We put a lot of effort into providing accurate estimates so you can build your final design without any last-minute concessions.

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No real stress, because they literally took care of every step. Can't say enough about their skill and professionalism."



West Seattle

Our project was on-time (to the day!) and on-budget (to the dollar!); such a relief to be able to trust a company who was doing something so enormous and important for our family!"


Erin and Mark

University District

Always professional. On time, kept to schedule to the day. Everyone was a perfectionist and the finished product shows it."




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

Magnolia, Seattle

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


They were communicative, responsive, clear, on schedule and within budget. I highly recommend CRD!"


Peter and Sasha


We can’t believe how much the remodel has changed our relationship with our house."

Benson and Lisa



Top-Quality Workmanship

Finish your basement with a two-year warranty.

Our full-time, in-house team of expert designers, architects, lead carpenters, and support staff are the best in the business. We back our craftsmanship with a two-year warranty, longer than the industry standard.

Get to Know Our Team