Pierce County · Washington

Basement and Garage Conversion in Sumner

Turn the square footage you already have into space you actually use, finished basements and garage conversions for suites, offices, gyms, and rentals. South Sound based, about 25 minutes from our shop, with over 12 years of hands-on remodeling experience behind every estimate we write.

Start Your Project Call (253) 312-6024

12 yrs

Experience

200+

Projects

5.0 ★

Rating

Free

In-home estimates

Basement and Garage Conversion in Sumner, WA by DA Interior Solutions

Walk-in shower · Sumner

Frameless glass · hex mosaic field · linear drain

WA Reg · Bonded · Insured

DAINTIS775JL

Scope of Work

What a Sumner basement and garage conversion includes

Every remodel is scoped to your home, your written estimate lists exactly what's included. A sample of what we cover:

▸Basement finishing: bedrooms, family rooms, home theaters, and full baths

▸Garage conversions to living space, offices, gyms, or ADUs

▸Framing, insulation, drywall, flooring, and finish to a warm, code-compliant space

▸Egress windows and proper exits for legal, safe bedrooms

▸Moisture control, vapor barriers, and waterproofing for below-grade spaces

▸Electrical, heating, and plumbing extended for full-function rooms and baths

▸Sound and thermal insulation for year-round comfort

▸Permitting and inspection handled end to end

Most basement or garage conversions run four to eight weeks depending on plumbing scope, egress work, and finish level.

Local Knowledge

Remodeling Sumner homes

Sumner blends a genuinely historic downtown core, Victorian and early-1900s homes with the quirks that come with them, and newer valley developments. Older Sumner homes reward careful renovation: original fir floors worth saving, plaster walls, and framing that predates modern dimensions.

Permits: the City of Sumner Permit Center issues residential permits, with design review in some historic areas. We handle the entire permit process, applications, plan documents, and inspection scheduling, on every project.

Historic DowntownSumner HeightsValley

How a Project Runs

One point of contact, start to sign-off

01Site Visit

Walk the space, take the measurements

We come to your home, measure everything, and listen more than we talk. You get a detailed written estimate, line by line, free, no pressure.

02Selections & Sequencing

Materials, permits, schedule

Finishes chosen with our guidance, permits pulled by us, trades booked in order. Nothing gets demoed until everything that follows is sequenced.

03Build & Walkthrough

Dust barriers up, schedule kept

Our crew builds, inspections pass, and we end the way it should: walking the finished space together, punch list in hand. It isn't done until you love it.

Field Reports

What clients say when the dust settles

★★★★★

Remodeled my kitchen and got it done a few days faster than expected, and it looks so nice now I can't wait to host people over.

Chris Estrada · Google Review

★★★★★

Did an excellent job doing a complete renovation/remodel of our bathroom and repairing/replacing a portion of siding on house. Really listened to what I wanted for my dream bathroom and delivered A+.

Pat Shandrow · Google Review

Read more reviews →See them on Google →

Budget & Planning

What to expect on cost

Conversions are one of the best value-per-square-foot projects in a home because the shell already exists. Cost is driven by moisture control, whether you are adding a bathroom, and egress requirements. We assess all three on a walkthrough and price it clearly.

Q & A

Questions, answered straight

Can I add a bedroom in my basement legally?

Yes, with proper egress. A legal basement bedroom needs a compliant egress window or door for safe exit, plus the right ceiling height and ventilation. We handle the egress work and the permit so the room counts as legal living space, not just finished square footage.

Will my basement stay dry after it is finished?

That is the first thing we solve. Before any framing, we address moisture: grading, drainage, vapor barriers, and waterproofing as needed. Finishing over a wet basement is the most common mistake we get called to fix, so we do it right from the start.

Can a garage conversion be an ADU I rent out?

In many cases, yes. A garage conversion can become a legal ADU with the right permits, egress, and utility connections, which we manage. We confirm what your lot and jurisdiction allow before you commit.

Which Sumner neighborhoods do you serve?

All of Sumner, including Historic Downtown, Sumner Heights, Valley, plus the surrounding Pierce County area. We're about 25 minutes from our shop.

Who handles remodel permits in Sumner?

For projects in Sumner, the City of Sumner Permit Center issues residential permits, with design review in some historic areas. We prepare and submit all permit applications and schedule every inspection on your behalf, you never deal with the counter.