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Find Basement remodelers in Seattle

Avatar for Build Up Northwest, LLC
Build Up Northwest, LLC
4.91(
22
)

Angi Approved

Super Service Award Winner

In business since 2018

Free estimates

Emergency services offered

"Oscar and his team were great. They gave an estimate less than a day after I requested a quote and came to do the work within a week. They were on time, professional, and did great work. My project was to install window sills and upgrade closet hardware. I am very happy with the result and would definitely hire them again."
10 neighbors recently requested a quote
Recommended by68%of homeowners
Your Home Builders, Inc.
5.00(
1
)

Angi Approved

In business since 2022

Free estimates

Customers say: Quick response

"Gil did an amazing job of figuring out exactly what I needed, and he hired an amazing crew to get it done. This is by far the best home renovation experience I've ever had. Gil and Oliver both were very thorough in figuring out what needed to be done, and every step of the way if there was ever any ambiguity, they asked questions and came up with great solutions for everything that came up. I have never before had such a good experience with a home renovation, and I wish all contractors were as good as them. My project was fairly involved, with a complete renovation of my kitchen, dining room, and laundry room, and yet the whole process took under a month to get done, and it was done right the first time. I wholeheartedly recommend Your Home Builders. No complaints at all."
Recommended by100%of homeowners
Avatar for Stocking Construction
Stocking Construction
5.00(
2
)

Angi Approved

In business since 2012

Free estimates

Warranties offered

"Stocking Construction did an excellent job on our kitchen nook. It was an awkward space that we couldn’t make work. Stocking Construction crafted us custom wrap around benches with hidden storage and a gorgeous long grain table. Jullian understood this was a big investment for us and was very patient with our many questions and put any concerns we had to rest. He definitely earned our trust and we couldn’t be happier with the outcome. We would recommend them for any project. "
7 neighbors recently requested a quote
L7 Homes LLC
New to Angi

Angi Approved

In business since 2005

Free estimates

L7 Homes LLC is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

Avatar for Renovate Design/Build
Renovate Design/Build
4.98(
21
)

Angi Approved

In business since 2018

Free estimates

Customers say: Quick response

"We worked with Renovate from August 2024 through April 2025. Our experience was exceptional. Ross, Eric, and Jeremiah were efficient and effective, treating our project with great care. The Renovate team stands out in several ways: - Their pricing is transparent. We paid an hourly cost and subcontractor costs, plus a fixed mark-up, which aligned incentives. Amanda provided receipts and timesheets regularly. - They have superb attention to detail. They pointed out issues we might have missed and ensured they were fixed. - They were super responsive, encouraging us to text or email any time and often responding quickly. They kept us updated on the timeline and explained any delays. - They have a strong client focus. They addressed subcontractor errors quickly and reminded us to ask for what we wanted, even if non-standard. They provided recommendations but let us make the final decisions. We highly recommend the Renovate team. For our more detailed review, see Google."
3 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Mount Baker Remodeling
Mount Baker Remodeling
4.29(
7
)

Angi Approved

In business since 2001

Free estimates

Emergency services offered

" We engaged My Baker after our basement flooded a few years ago. They did very good work on a project despite it being during the pandemic. Their workers were respectful and the project was finished on budget at quality standards we were thrilled with. "
Recommended by42%of homeowners
Avatar for BB-Builders-Pro LLC
BB-Builders-Pro LLC
4.99(
37
)

Angi Approved

Super Service Award Winner

In business since 2000

Free estimates

Customers say: Quick response

"Our two bathrooms were remodeled by BB Builders Pro, who worked carefully with us and went above and beyond to ensure our satisfaction. Highly recommend them for any remodeling services!"
119 neighbors recently requested a quote
Recommended by64%of homeowners
Avatar for Tempered Custom Renovations, LLC
Tempered Custom Renovations, LLC
5.00(
1
)

Angi Approved

In business since 2025

Free estimates

"Austin redid my flooring in my kitchen after some water damage occurred, he did an absolutely amazing job and had amazing communication unlike some other people I had contacted. He was kind and professional and I would highly recommend Austin for any job big or small! "
1 neighbors recently requested a quote
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FAQs for basement remodeling projects in Seattle, WA

Finishing a basement turns unused square footage into livable space and returns up to 70% of what you spend when you sell your home. Beyond that resale boost, you gain a playroom, home office, or guest suite you can start enjoying right away. That mix of daily comfort and solid return on investment (ROI) makes basement finishing one of the smartest upgrades you can tackle.

In some parts of the country—especially lots on swamps, high water tables, or other wetlands—local codes prohibit basements. Saturated soil puts constant pressure on foundation walls and lets water seep in faster than any sump pump can handle. 

If your property sits on waterlogged ground, building on a slab or crawl space is often safer, more affordable, and code-compliant.

Most basements wrap up in four to eight weeks. Framing takes three to five days, with electrical and plumbing rough-ins following over the next week. Add five days for drywall, two to three for flooring, and another week for paint, trim, and punch-list items. 

Delays can happen if materials run late or your contractor’s calendar is packed, so build in a little cushion when you plan.

Whether a finished basement counts toward your home’s official square footage depends on local rules. Many areas only include below-grade space if it has code-approved egress, fully finished walls, ceilings, and floors, plus consistent heating. 

Check with your local assessor or building department before you start; meeting those standards can affect taxes, appraisals, and resale value.

Building codes require a checklist: dedicated heat and electrical service, a code-approved stairway, and at least one egress window or exterior door. Walls, ceilings, and floors must be fully finished and meet insulation, ventilation, and fire-separation standards. If you add a bedroom, you’ll also need a closet, proper clearances, and safe exits. If you change the layout later, be ready to update the space so every new room still meets today’s code.

The Seattle, WA homeowners’ guide to basement remodelings

From average costs to expert advice, get all the answers you need to get your job done.