Foundation Leak Repair in Rancho Palos Verdes, CA
Water entering through foundation cracks and cold joints — sealed at the source, drainage corrected, structure protected.
Two Kinds of "Water Under the House"
Homeowners often call us about a "slab leak" that's actually a foundation leak — groundwater finding its way through a crack, a cold joint where the wall meets the footing, or a porous section of concrete. The symptoms overlap: damp floors, musty odors, efflorescence on concrete. But pouring money into plumbing repairs won't stop groundwater, and sealing a foundation won't fix a burst pipe. Getting the diagnosis right is everything.
Why Peninsula Foundations Leak
Rancho Palos Verdes gives foundations a hard life. Hillside lots concentrate runoff against uphill walls. Bentonite clay soils swell against foundations with tremendous pressure when saturated. Older homes sit on footings poured before modern waterproofing membranes existed. And seismic activity opens hairline cracks that become highways for water during the next heavy rain.
How We Fix Them
Crack injection. For most active cracks, we inject structural epoxy or expanding polyurethane through ports spaced along the crack. The material fills the void through the wall's full depth, bonds the concrete, and flexes slightly with future micro-movement. It's done from inside — no excavation.
Exterior waterproofing. For walls with multiple entry points or failed original dampproofing, we excavate to the footing, apply a waterproof membrane and drainage board, install or repair footing drains, and backfill properly. It's the definitive fix for chronic wall leaks.
Drainage correction. The unglamorous hero. Regrading soil away from the foundation, extending downspouts, and installing French drains or swales often solves "foundation leaks" that were really drainage failures all along.
Start With the Right Diagnosis
Our first visit determines which problem you actually have — plumbing leak, groundwater intrusion, or both (it happens). Then we fix the right one, in the right order: stop active water, seal the entry, correct the drainage. Call (833) 713-2101 and we'll sort it out.
Water Coming Through the Foundation?
Foundation leaks worsen with every rain. Get a professional assessment and a permanent seal.
Get Free EstimateTypical Pricing
| Service | Typical Range | Details |
|---|---|---|
| Foundation Crack Injection | $500–$1,500 | Epoxy or polyurethane injection sealing active cracks, per crack. |
| Exterior Waterproofing (per wall) | $2,000–$6,000 | Excavate, membrane, drainage board, and backfill for a foundation wall section. |
| Drainage Correction | $1,500–$5,000 | Grading, drains, and downspout extensions to redirect water away from the foundation. |
Representative market ranges for informational purposes only — OWNER-TO-VERIFY. Your fixed written quote comes after on-site diagnosis.
Frequently Asked Questions
How is a foundation leak different from a slab leak?
A slab leak is a pressurized plumbing line leaking under the slab. A foundation leak is groundwater or drainage water entering through cracks, cold joints, or porous concrete. They can look similar (damp floors, musty smells) but the fixes are completely different — which is why proper diagnosis comes first.
Can foundation cracks be repaired from the inside?
Yes, for many cases. Epoxy or polyurethane injection fills the crack through its full depth and bonds the concrete back together — often without any exterior digging. Severe or recurring leaks may need exterior waterproofing.
Will the crack come back after injection?
Properly injected structural epoxy restores the concrete's integrity and typically outlasts the surrounding wall. If the underlying cause is ongoing soil movement or hydrostatic pressure, we address that too — otherwise any repair is temporary.
Do I need to fix drainage as well?
Usually, yes. Most foundation leaks are drainage problems wearing a concrete disguise. Sealing the crack without redirecting the water just moves the entry point. We assess grading, gutters, and subsurface drainage as part of every foundation leak call.
Related Services
Serving Neighborhoods Across the Peninsula
We bring this service to every corner of our coverage area: