DA DA Interior SolutionsGeneral Contractor · South Sound, WA
(253) 312-6024 Start Your Project
King County · Washington

Home Additions and ADUs in Maple Valley

More square footage done right, room additions, second stories, and accessory dwelling units engineered, permitted, and built to match the home you already love. South Sound based, about 45 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
Home Additions and ADUs in Maple Valley, WA by DA Interior Solutions
Walk-in shower · Maple Valley
Frameless glass · hex mosaic field · linear drain
WA Reg · Bonded · Insured
DAINTIS775JL
Scope of Work

What a Maple Valley home additions includes

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

▸Room additions and bump-outs: primary suites, family rooms, home offices, and kitchens
▸Accessory dwelling units (ADUs): attached, detached, and garage conversions for rental income or multigenerational living
▸Second-story additions and structural reconfiguration
▸Foundation, framing, roofing, and exterior tie-ins matched to the existing home
▸Full mechanical scope: electrical, plumbing, and HVAC extended to the new space
▸Design, engineering, and permitting handled for you
▸Finishes matched to the existing home so the addition never looks bolted on
▸Built to current code and energy requirements

Additions and ADUs typically run two to four months depending on size, foundation work, and permitting timelines, which we manage and keep you ahead of.

Local Knowledge

Remodeling Maple Valley homes

Maple Valley is a newer King County suburb of 1990s-2010s subdivision homes on wooded lots around Lake Wilderness and the Four Corners area. The common work here is opening up builder-grade floor plans and updating the first generation of kitchens and baths as these homes hit their twenties.

Permits: the City of Maple Valley issues residential remodel permits; some addresses route through King County plan review. We handle the entire permit process, applications, plan documents, and inspection scheduling, on every project.

Four CornersLake WildernessSummit ParkRock Creek
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

★★★★★

We had our patio converted into a sunroom at the end of 2025 and are pleased with the outcome. DA Interior Solutions did an outstanding job from start to finish. Their craftsmanship is top-notch, they used premium materials throughout, and they were incredibly attentive to every detail from inception to completion. The entire renovation was smooth and hassle-free. Devon and his team were professional, communicative, and clearly took pride in their work. The carpentry they did on our home is exceptional-you can tell they are about quality. We highly recommend DA Interior Solutions to anyone looking for a reliable, skilled team for their next home project. Thank-you Devon and crew!

Margaret Miner · Google Review · Aug 2026
★★★★★

This company is fabulous! They helped me to create a perfect room from the open space. They worked within my budget. Hard workers. Conscientious. I already have my next project scheduled with them and have several others planned! I highly recommend DA Solutions! Thank you, Mauricio, Adam, Devon, Luiz, and team!

Kimberly Shoffner · Google Review · Aug 2026
★★★★★

They’re hardworking guys who clearly care about their customers and the quality of their work. We look forward to working with them again.

Matt Kippes · Google Review · Aug 2026

Read more reviews →See them on Google →

Budget & Planning

What to expect on cost

Additions and ADUs are priced by square footage, foundation and structural scope, and finish level. We walk the project with you, flag the cost drivers like foundation, roof tie-in, and utility runs up front, and give you a clear line-item estimate, including the rental-income math if an ADU is the goal.

Q & A

Questions, answered straight

Is an ADU worth it for rental income?

Often, yes, especially in our market, where demand for rentals and multigenerational space is high. We give you a realistic build cost and timeline so you can run the numbers, and we handle the permitting that makes an ADU legal to rent.

Will the addition match my existing home?

That is the whole point. We match rooflines, siding, trim, and finishes so the addition reads as part of the original home, not an obvious add-on. Done right, you cannot tell where the old house ends and the new space begins.

Do you handle the engineering and permits?

Yes. Additions involve structural engineering and a fuller permit set than a remodel, and we manage all of it, design, engineering, plan submittal, and inspections, so you are not chasing architects and the city yourself.

Which Maple Valley neighborhoods do you serve?

All of Maple Valley, including Four Corners, Lake Wilderness, Summit Park, Rock Creek, plus the surrounding King County area. We're about 45 minutes from our shop.

Who handles remodel permits in Maple Valley?

For projects in Maple Valley, the City of Maple Valley issues residential remodel permits; some addresses route through King County plan review. We prepare and submit all permit applications and schedule every inspection on your behalf, you never deal with the counter.

Planning a home additions in Maple Valley?

Free in-home site visit, precise measurements, and a written line-item estimate. No pressure, no obligation.

Start Your Project Call (253) 312-6024
Nearby

Home Additions and ADUs near Maple Valley

Home Additions and ADUs, Puyallup, WAHome Additions and ADUs, Tacoma, WAHome Additions and ADUs, Gig Harbor, WAHome Additions and ADUs, Lakewood, WAHome Additions and ADUs, University Place, WAHome Additions and ADUs, Bonney Lake, WAHome Additions and ADUs, Sumner, WAHome Additions and ADUs, Fife, WA

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