Boulder, CO's Trusted Foundation Repair Contractor

Does your home or commercial property have bowing foundation walls, sinking concrete slabs, or leaky windows in the basement? There is no reason to worry — Thrasher Foundation Repair is your trusted expert, providing solutions for these problems and so much more since 1975.

Contact Thrasher Foundation Repair to schedule a free inspection and cost estimate on any of our reliable services, including basement waterproofing, foundation repair, crawl space encapsulation, and concrete repair. We proudly serve Boulder, CO and nearby areas.

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Durable home foundation repairs in Boulder

No matter how small the foundation damage may seem, problems can worsen and impact other areas of a home or building, leading to issues like sticking windows and doors, cracked drywall, a tilting chimney, and moisture intrusion. From cracked foundation floors to bowing basement walls and foundation settlement, Thrasher Foundation Repair provides permanent solutions for these structural problems and more.

Home Foundation Problems We Fix:

  • Foundation settlement & sinking
  • Sticking windows & doors
  • Tilting chimneys
  • Tilting & bowing walls
  • Cracked foundation walls & floors
  • Collapsing retaining walls
  • Sagging crawl space
  • Uneven floors

Our House Foundation Repair Products:

  • Crawl space support posts
  • Push piers & helical piers
  • Wall anchors
  • Street creep repairs
  • Foundation wall brace & beams
  • Carbon fiber wall straps
  • Foundation settlement repair
  • Foundation crack repair

Schedule a free foundation inspection and service estimate to get personalized repair solutions for your property. We proudly serve Boulder and nearby areas in Colorado.

Lasting basement waterproofing system in Boulder

If your home or building has damp walls, excess condensation, mold, or other moisture intrusion problems, contact the basement waterproofing experts at Thrasher Foundation Repair.

We can eliminate basement flooding and leaking with a patented waterproofing system customized to suit any property, creating a dry below-grade space and keeping it that way for years to come! We proudly serve Boulder and nearby areas in Colorado.

Schedule a free basement waterproofing inspection and service estimate to learn more. We proudly serve Boulder and nearby areas in Colorado.

Our basement waterproofing system includes:

  • Interior drainage systems
  • Sump pumps
  • Mold treatment
  • Dehumidifiers

Crawl space repair & encapsulation services in Boulder

Do you have a musty, wet, and humid crawl space in your home or building? Don’t deal with the mess on your own. Contact the crawl space encapsulation and repair professionals at Thrasher Foundation Repair! We provide a suite of crawl space solutions designed to create a drier, more secure area, including a moisture-proof vapor barrier, crawl space doors, crawl space support jacks, and more.

Concrete repair & concrete leveling experts in Boulder

If you’re tired of sinking, cracked driveways, pool decks, sidewalks, or other concrete slabs around your property, contact the concrete repair professionals at Thrasher Foundation Repair. We offer simple, innovative solutions that are far superior to the standard mudjacking or concrete replacement. Our cracked concrete repair, concrete leveling, and concrete sealing systems install with no mess and no stress. Plus, they are quick to cure, so you can use your slabs soon after installation.

Never worry about UV rays, debris, gas, water, or other liquids ruining your slabs. Our solutions are incredibly durable and address the underlying cause of concrete damage, meaning you get lasting results that save you money!

Schedule a free concrete repair estimate to learn more. We proudly serve Boulder and the surrounding areas.

Our concrete repair solutions:

  • PolyLevel® concrete leveling
  • NexusPro™ cracked concrete repair
  • SealantPro™ concrete sealing
  • Commercial concrete repairs
  • Driveway repairs
  • Pool deck leveling
  • Sidewalk repairs
  • Step repairs

The Thrasher Difference.

No matter the job - we aren't going to feel good about the hard work we've done until you're happy. So we'll do it right or make it right. That's the Thrasher promise.

For the last 45 years in the basement and foundation repair industry, we've focused on the value of doing whatever it takes to get the job done and "wow" our customers every step of the way.

Explore The Thrasher Difference

Before and After Pictures from Boulder

Recent job requests in Boulder, CO

Neighborhood: BELL DR, Boulder, 80301

Single stall Garage, driveway and sidewalk have sagged becoming unlevel and starting to crack.

Neighborhood: Kittrell Ct, Boulder, 80305

The house is on a down slope. It seems like the backyard dirt pushes one of the walls.

Neighborhood: Boulder, 80303

Settling on NW corner

Neighborhood: Chambers Dr, Boulder, 80305

I have some sidewalk that is angled toward the house and I want to fix the drainage

Neighborhood: Juniper Avenue, Boulder, 80304

Sagging first floor above crawl space. Needs support jack and vapor barrier.

Neighborhood: Juniper Ave, Boulder, 80304

I've got elevated humidity from water intrusion in my basement

Neighborhood: Euclid Place, Boulder, 80303

Damp carpet around baseboards, walls and window are dry. Clogged downspout above wet area seemed to cause water pooling around house at corner.

Neighborhood: Boulder, 80302

Flooding occur after several recent rains in the Eastern side of house in basement.

Neighborhood: Boulder, 80305

Water seeping in crawl space wall foundation joint.

Neighborhood: Bellevue Drive, Boulder, 80302

Hello we are having on going issues with water leaks that we suspect may be due to foundation issues.

Neighborhood: Waterstone Drive, Boulder, 80301

Neighborhood: Durham Way, Boulder, 80301

Water coming into basement through cracks in the wall and possibly from underneath slab.

Neighborhood: Brook Rd, Boulder, 80302

Driveway has a few cracks and pits. Sloping driveway at close-in foothills location north Boulder.

Neighborhood: Maya Pl, Boulder, 80301

Neighborhood: Boulder, 80305

- Cracks in foundation need repair - Want to level out floors

Neighborhood: Boulder, 80302

Neighborhood: Boulder, 80301

Recently installed new flooring. My house seems to shift quite a lot. Ruined my floors. Want to make sure there are no problems with the footings my house sits on.

Neighborhood: Boulder, 80303

Steel beam support in crawl space showing some rust.

Neighborhood: Boulder, 80304

Sunken garage floor.

Neighborhood: Boulder, 80301

Need to see about potentially caulking the expansion joints in a concrete driveway.
Job Stories From Boulder, CO
Porch Repair in Boulder, CO

This homeowner had a fox burrowing under her back porch. She was afraid that void the fox created has made her back porch structurally unsafe. She wanted a quality company that would do the job right. She knew of Thrasher and our great reputation, and gave us a call. System Design Specialist, Mike Williams, came out to meet with her. He found the hold that the fox had dug, and noticed because of the hold, there was little to no support for the slab to sit. Although they were small, cracks were starting to form on the porch. Mike and the homeowner decided we use our Concrete Protection System to help fill this void and prevent it from happening again. We used Polylevel to fill the void under the porch and NexusPro to seal the cracks caused by the void. There is no doubt this homeowner is back to using her porch like normal, without worries of it sinking. 

Concrete Repair in Lone Tree, CO

This customer in Lone Tree, CO was noticing some spots in his garage that were starting to crack and seeming to become unlevel. He had planned on selling his home within the next few years and wanted to get this issue fixed beforehand to maintain the property value of his home. After seeing Thrasher trucks in his area, he decided to give us a call to see how we could help solve his problem. 

After the crew came out for inspection, we were able to determine that his problem came from further down his driveway. Spots in the slab further down the driveway were starting to settle causing issues with the rest of the concrete leading all the way up into his garage. We were able to solve this by using our PolyLevel, which is an expanding foam to lift the concrete and fill the voids underneath. Then the team used NexusPro to seal and protect joints and cracks in the driveway and garage to prevent this from happening again in the future. 

This customer felt appreciative about knowing what the problem was and how we fixed it, he can now think about selling his home without worrying about these issues in the future. 

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