Foundation repair
Pier, slab, crawlspace, basement waterproofing. We match you with up to 4 vetted local contractors who verify their license and insurance with our network.
Foundation issues are the most expensive home-repair category most homeowners ever face. Real foundation problems exist and matter; the trick is distinguishing them from cosmetic cracks and active settlement from inactive long-ago movement.
This page covers how to read your own foundation, when symptoms warrant a structural engineer's evaluation, and the differences between pier-and-beam, slab-on-grade, and crawlspace foundations. We connect homeowners with vetted local foundation specialists.
How to read your own foundation
Most homeowners can self-screen for real foundation problems before paying for an engineer's evaluation. The patterns that distinguish active structural problems from cosmetic settling:
Active settlement signs: doors and windows that suddenly stick when they didn't before, cracks that widen visibly over time, cracks wider than 1/4 inch, cracks that go diagonally through wall corners, separation between exterior brick and the foundation, gaps where countertops meet walls. The "suddenly" matters — most real foundation movement happens over months to years, but the symptoms appear in 1-3 month bursts during seasonal soil shifts.
Not-active or cosmetic signs: hairline cracks under 1/16 inch in basement walls (universal in poured concrete, mostly cosmetic), narrow vertical cracks on plaster or drywall (drying shrinkage), cracks at corners of windows and doors (framing settles, not foundation), cracks that don't change between seasonal photographs taken 12+ months apart.
Water issues vs structural issues: water in a basement is a separate problem from foundation movement. Standing water is a drainage problem (often solvable for a fraction of a foundation repair). Active leaks at wall-to-floor joints can be either drainage or structural — an engineer's call distinguishes them.
Foundation types — the three you'll encounter
Each foundation type has its own repair vocabulary and failure modes:
- Slab on grade — a single concrete pour at ground level. Common in Texas, Florida, Arizona, and post-1970 construction nationally. Failure mode: settlement from soil movement; repair via piers (push, helical, or hybrid) under the slab edge.
- Crawlspace — concrete or block perimeter wall with open space underneath, dirt or vapor-barrier floor. Common in the Southeast, Pacific Northwest, and pre-1970 construction. Failure mode: moisture damage, sagging beams, post settlement; repair via beam jacks, post replacement, encapsulation.
- Full basement — poured concrete or block walls with finishable space below. Common in the Midwest, Northeast, mountain West. Failure mode: wall bowing from lateral soil pressure, water intrusion, settlement; repair via wall anchors, push-piers, drainage systems.
- Pier and beam — wood beams supported by concrete or wood piers, with crawlspace underneath. Common in older Texas, Louisiana, and parts of the South. Failure mode: pier rot, soil shifts, beam sag; repair via pier replacement, beam jacks, leveling.
The repair methods (and which is right when)
Foundation repair methods are not interchangeable. Matching the right repair to your specific foundation type and failure mode is the engineer's call, not the salesperson's.
Push piers (steel piers driven to bedrock or load-bearing strata): the standard for slab-on-grade foundations with active settlement. Press-hydraulic equipment drives steel pier sections down through the soil until they reach refusal at bedrock or a competent load-bearing layer. Then the foundation is lifted to its original position and locked. Cost is usually quoted per pier; the right number is determined by the engineer's analysis.
Helical piers: rotated into the soil rather than driven. Useful where push piers can't be installed (limited overhead clearance, certain soil types). Common in tight-access situations and lighter loads.
Wall anchors: for basement walls bowing inward from lateral soil pressure. Installed perpendicular to the wall with anchor plates outside the foundation, tied through the wall. Tightened gradually over months to slowly correct the wall position.
Beam jacks and post replacement: for crawlspace foundations with sagging beams or rotting posts. Less invasive than pier work; targeted at the specific failure points.
Encapsulation: for crawlspaces with chronic moisture issues. Vapor barrier across the floor, sealed at the perimeter, often with a dehumidifier. Not a "foundation repair" per se but addresses the moisture damage that causes other foundation issues over time.
Drainage systems (interior or exterior French drains, sump pumps): for water intrusion in basements and crawlspaces. Often confused with foundation work but is a separate trade.
Frequently asked questions
How do I know if my foundation problems are serious?▾
The combination of symptoms matters more than any single sign. Doors and windows suddenly sticking, cracks wider than 1/4 inch, diagonal cracks through wall corners, and gaps between countertops and walls together suggest active settlement that warrants a structural engineer's evaluation. Hairline cracks alone (under 1/16 inch) are usually cosmetic. The diagnostic test: photograph cracks today, photograph again in 6-12 months. If they haven't changed, the problem is inactive.
Should I get a structural engineer or a foundation contractor first?▾
A structural engineer's evaluation produces an independent assessment that scopes the actual work needed. Use the form on this page to get matched with a vetted foundation specialist who works from engineer-stamped repair plans.
What's the difference between push piers and helical piers?▾
Push piers are driven straight down using hydraulic pressure until they hit refusal at bedrock or competent load-bearing strata. Helical piers are rotated into the soil like a screw, with helical plates that provide bearing through soil. Push piers are the standard for most slab-on-grade settlement repairs; helical piers are used in limited-clearance situations, certain soil types, or lighter-load applications. The engineer specifies which is appropriate based on soil testing and the load profile.
My crawlspace has standing water — is that a foundation problem?▾
Probably a drainage problem first. Standing water in a crawlspace is usually surface drainage failing — gutters, downspouts, grading toward the house, no perimeter drain. Address those first; cost is typically much less than foundation work and often solves the underlying issue. If the water is coming through a foundation crack rather than over the top of the wall, that's a different problem (potentially structural). An independent engineer can distinguish the two.
Are foundation cracks always serious?▾
No. Most concrete cracks are cosmetic and follow predictable patterns: hairline vertical cracks in poured walls (drying shrinkage), step cracks in block walls following the mortar joints (settlement, often inactive), diagonal cracks at window/door corners (framing settling, not foundation). The cracks that matter: wider than 1/4 inch, diagonal across whole wall sections, accompanied by other symptoms (sticking doors, separating trim, tilted floors), or actively widening over months.
Can I sell a house with documented foundation repair?▾
Yes, with proper documentation. Foundation repair is a known and accepted home maintenance item when properly done and documented. The package buyers want to see: the original engineer's assessment, the repair plan with engineer P.E. stamp, completion photos, the warranty document with transferability, and any post-repair re-evaluation.
How do I find a vetted foundation contractor?▾
Use the form on this page. We match you with vetted local foundation specialists licensed in your state with current insurance verified at network admission.