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Products & Services

Basement Waterproofing
Waterproof Wall Products
DryTrak Basement Water Control System
Floodring Water Heater Protection
Basement Dehumidifier
Sump Pump Solutions
TripleSafe Sump Pump
SuperSump Sump Pump
UltraSump Sump Pump
Interior Drainage Systems
WaterGuard® Drainage System
WaterGuard®: Iron Ochre System (IOS)
WellDuct Window Well Drain

Crawl Space Repair & Encapsulation
CleanSpace Moisture Barrier System
Crawl Space Structural Repairs
SmartJack
Crawl Space Access Wells & Doors
Crawl Space Sump Pumps
TripleSafe Sump Pump
SuperSump Sump Pump
UltraSump Sump Pump
Downspout Extensions

Foundation Repair
Pier Systems
Push Piers
Slab Piers
Helical Piers
SmartJack Crawl Space Support Posts
Foundation Wall Repair
Geo-Lock Wall Anchors
PowerBrace Basement Wall Repair System
CarbonArmor Reinforcing Basement Wall System
Bowing Foundation Wall Repair
Shotcrete Spray Concrete
Concrete Lifting

Concrete Repair
Concrete Driveway Repair
Concrete Pool Deck Repair
Concrete Walkway Repair
Concrete Patio Repair
Concrete Leveling & Lifting
Mudjacking Alternatives
NexusPro Cracked Concrete Repair

Earthquake Retrofitting

Free Estimates & Inspections

TerraFirma serving King County, WA

Happy Customers Surrounding King County, WA
Work Requests

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Highly-Trained Foundation Repair, Basement Waterproofing, Crawl Space Repair & Concrete Repair Company in King County, [city_page:state_abbr]

TerraFirma adheres to the highest industry standards in foundation repair, basement waterproofing, crawl space repair, and structural repair. We strive to be the industry leader in the home improvement services we provide. Our installation crews and foundation repair specialists use only state-of-the-art products and technology designed to fix your home. We are the Supportworks and Basement Systems dealer in King County.

Foundation Repair Services We Offer in King County:

  • Foundation and structural repair solutions
  • Foundation piers, including helical piers
  • Foundation slab repair
  • Foundation crack repair
  • Foundation stabilization, leveling & underpinning
  • Foundation settlement/sinking repair
  • Foundation wall repair
  • Sinkhole repair
  • Push pier underpinning
  • Concrete sidewalk leveling & repair
  • Concrete driveway leveling & repair
  • 25-year warranty against manufacturing defects on foundation products
  • Financing available
  • FREE written estimates and inspections

Basement Waterproofing & Crawl Space Repair Services We Offer in King County:

  • Wet/flooded basement waterproofing solutions
  • Lifetime warranty on all perimeter waterproofing systems
  • Crawl space encapsulation and insulation
  • Crawl space waterproofing
  • Sagging crawl space repair with crawl space support post installation
  • Crawl space sealing and vapor barrier installation
  • Crawl space dehumidifier installation
  • Sump pump installation, replacement, and repair
  • 25-year warranty on crawl space encapsulation systems
  • FREE written estimates and inspections
News & Events From from King County
How water damage affects your foundation
Along with the potential of mold growing in your basement or crawl space, water damage could also affect your foundation.... [Read more]
How your crawl space affects your heating bill
Keeping your home warm and comfortable can get a little pricey during the winter, but there is a way for you to reduce your monthly energy bill.... [Read more]
Heavy storm to hit Oregon and SW Washington tonight
According to the National Weather Service, the strongest storm of winter is expected to hit Oregon and Washington tonight.... [Read more]
Work Requests From King County, WA
Vicinity of in King
Void below the basement slab