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HomeAdvisor - Best Of 2020 Award
TerraFirma was proud to have received the 2020 HomeAdvisor 'Best Of' Award. This award recognizes only the top percent of... [Read more]
Elite Service Professional Award
By receiving no homeowner complaints and having more than five five star ratings on our profile, TerraFirma was awarded the... [Read more]
Home Advisor Top Rated Company
TerraFirma earned the "Top Rated" award from Home Advisor, a home improvement website that millions of homeowners trust to help... [Read more]
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Your Trusted Seattle, WA Foundation, Basement Experts

Trusted basement waterproofing, crawl space encapsulation, earthquake retrofitting, foundation repair & more! Call today!

Happy Customers Surrounding Seattle, WA
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Basement Waterproofing, Crawl Space Encapsulation, Crawl Space Repair, Foundation Repair Contractors & More in Seattle

TerraFirma has been your trusted basement waterproofing and foundation contractor since 2005. We provide repair services, exemplary customer service and proven products to homeowners in Seattle. Does your home have a musty basement or crawl space? Are you noticing cracks in your floors or walls?

TerraFirma handles an array of home repairs quickly & efficiently:

  • Basement Waterproofing
  • Foundation Repair
  • Foundation Wall Repair
  • Crawl Space Repair
  • Crawl Space Encapsulation
  • Earthquake Retrofitting
  • And many other services!

Call today for your FREE no cost, no obligation estimate for repairs in Seattle.

Basement Waterproofing

The benefits to waterproofing your leaky basement are endless. Say goodbye to leaking floors and windows, mold growth, grossly high utility bills and more. We specialize in basement repair and waterproofing to add useful square footage, in turn adding value to your home.

Our waterproofing solutions include:

  • Drainage systems
  • Sump pumps
  • Wall coverings
  • Waterproof basement flooring
  • Basement dehumidifiers
  • Window wells
  • And additional products to finally solve your wet basement problem!

Call us today to schedule your estimate!

Crawl space repair & encapsulation

The health of your crawl space can determine the health of the rest of your home. So if your crawl space is showing signs of mold growth, musty smells, rotting floor joists and other unpleasantness, chances are the rest of your structure will be affected. Crawl space repair will save your home from further damage, and encapsulating your crawl space will provide added storage space you never knew you needed! Our crawl space waterproofing & encapsulation processes include vapor barriers, sump pump installation, downspout extensions and crawl space doors and access wells.

Foundation repair

Are you seeing cracks in your foundation walls or floors? Perhaps a bowing exterior wall, uneven floors or cracked floors? If your Seattle home is showing signs of foundation issues, TerraFirma has the solution.

We solve any foundation problem, including:

  • Structural settlement
  • Ground and soil sinkage
  • Cracks in stone
  • Water stains
  • Sloping floors
  • Jammed windows
  • And more!

Call TerraFirma today for your no cost, no obligation FREE estimate for foundation repair. We look forward to helping your home.

News & Events From from Seattle
With constant maintenance and added expenses, being a homeowner involves a lot of responsibility, which can extend beyond your property line.... [Read more]
Work Requests From Seattle, WA
Vicinity of in Seattle
House is settling.
Vicinity of Bella Vista Ave S in Seattle
Our Seattle 1921 home is having foundation settling issues. One corner of the home is 3.75 inches lower than the high point. We've had one company come out and do a bid and they recommended various piers (concentric and eccentric) to get the job done. I'd like to get a second opinion from TerraFirma. Best Regards, Conrad
Vicinity of West Viewmont Way West in Seattle
Back stairs from our garage to house- need to be replaced or if possible leveled. Beginning a landscaping project in the fall and would like this completed first Thank You
Vicinity of in Seattle
Hello, I am interested in getting a quote for foundation repair. We have a 1902 home we would like sealed up, due to rodent problems, and repair of the original masonry foundation.
Vicinity of in Seattle
I opened our detached garage door Sunday morning to find ~2 inches of standing water following the heavy rainfall on Saturday evening. We've removed the water and are now seeking a leak specialist to pinpoint the source and provide repair options. The garage is slab concrete with cinder block walls. The water was limited to the west side of the 2 car garage.
Vicinity of in Seattle
We have some issues with settling in the northwest corner of our house and need an evaluation for the cause and an estimate for repair. Thanks!
Vicinity of in Seattle
I would like to seismically retrofit my basement, look at replacing main floor supports with an I-beam, and structurally isolating a chimney (to be removed in the future). I'm interested to hear if that is work you perform and when you can be out for a quote. Thanks, Charlie
Vicinity of in Seattle
Hi, I am having foundation settling issues in my 1901 home, which I think are water related. It started a few years ago with one wide space developing in flooring along the seam where floor joist orientation in basement switches from N/S to E/W. Now, in the past few months, flooring throughout the house is showing gaps, "bounciness" and creaking. The problem seems to be getting worse at an excelerated rate. It appears to be water related. Four new houses were constructed next to us about five years ago where there had been just one old house before. Is this something that you can diagnose and potentially help with? Please let me know when you have the chance. Thanks, Andrew
Vicinity of S. Orchard in Seattle
Seeking estimate for basement encapsulation of 1907 house on a poured concrete foundation wall with an open crawl space.
Vicinity of in Seattle
I have a 108 year old home that I purchased a few years ago. Over that time, I've noticed our floor sloping and see cracks in the softwood floors. I'm thinking historically poor drainage has caused the north portion of our foundation to sink. I'd love to get an opinion on how to correct. Thank you.
Vicinity of in Seattle
I would like to get an estimate for waterproofing my basement. There is a sump pump system installed which is somewhat effective and it seems there may have been an effort to begin the process of waterproofing but it is incomplete at this time.
Vicinity of SW Thistle St in Seattle
Noticed several small things on the interior of the home. Old home that was flipped 4+ years ago when I bought it
Vicinity of in Seattle
Basement has water flooding
Vicinity of in Seattle
Basement floor has cracks, movement, and unevenness.
Vicinity of in Seattle
Attached garage corner foundation sags by several inches. Have significant crack in foundation.
Vicinity of in Seattle
Basement is wet at times, need permanent solution.
Vicinity of in Seattle
Over the past several months we have started noticing a strong musty smell from the vents when the air conditioning or heating comes on, especially when it's wet outside. The crawl space smells similarly, so we suspect rotting wet wood and would like an inspection. Thanks!
Vicinity of in Seattle
I am a realtor. My seller's home has some foundation issues. Could one of your tech. come out to give us a bid? Thank you,
Vicinity of Boyer Ave E in Seattle
A portion of our basement floor seems unstable and would like support in our crawl space.
Vicinity of in Seattle
Water leaking into finished basement.
Serving the following Seattle, WA zip codes
98101, 98102, 98103, 98104, 98105, 98106, 98107, 98108, 98109, 98111, 98112, 98113, 98114, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98124, 98125, 98126, 98127, 98129, 98131, 98133, 98134, 98136, 98138, 98139, 98141, 98144, 98145, 98146, 98148, 98154, 98155, 98158, 98160, 98161, 98164, 98165, 98166, 98168, 98170, 98174, 98175, 98177, 98178, 98181, 98185, 98188, 98190, 98191, 98194, 98195, 98198, 98199, 98101, 98102, 98103, 98104, 98105, 98106, 98107, 98108, 98109, 98111, 98112, 98113, 98114, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98124, 98125, 98126, 98127, 98129, 98131, 98133, 98134, 98136, 98138, 98139, 98141, 98144, 98145, 98146, 98148, 98154, 98155, 98158, 98160, 98161, 98164, 98165, 98166, 98168, 98170, 98174, 98175, 98177, 98178, 98181, 98185, 98188, 98190, 98191, 98194, 98195, 98198, 98199