Drainage & Soil Correction
Foundation Drainage Correction San Antonio, TX
Stop water from undermining your San Antonio foundation. Grading, French drains, and moisture plans for expansive clay soil.
Foundation drainage correction in San Antonio protects the slab from clay that swells when wet and shrinks in drought. Negative grade, clogged gutters, and flat ranchland lots funnel water to the footing line, the exact place expansive soil does the most damage.
Signs You Need Drainage Work
- Water pools within six feet of the foundation after rain
- Soil pulls away from the slab edge in summer
- Musty crawl space or white efflorescence on stem walls
- Cracks that widen only on the downhill side of the lot
- Gutters that dump at the corner with no extension
Solutions We Install
Surface grading re-pitches soil away from the house. Swales intercept uphill runoff on sloped lots in Boerne and New Braunfels. French drains collect subsurface water along the footing and route it to daylight. Downspout extensions keep roof volume from hammering one corner of the slab.
Moisture maintenance plans, including soaker hose placement during drought, are included when appropriate. Drainage alone cannot lift a slab that already dropped, but it keeps piering investments from fighting the same water problem every season.
Foundation drainage repair cost in San Antonio
Linear feet of drain, soil export, and hardscape access set the price.
| Scope | Typical range |
|---|---|
| Downspout extensions & surface grading | $1,500 – $3,500 |
| Swale or berm along one slab side | $2,500 – $5,000 |
| French drain (single side, 50–80 ft) | $3,500 – $8,000 |
| Full perimeter drainage + grading | $8,000 – $15,000 |
| Combined drainage + piering package | Quoted after survey |
Ranges reflect San Antonio market conditions. Final price depends on inspection findings. We quote in writing before work begins.
Drainage Before or With Piering
We inspect runoff during or right after rain when possible. If a Converse or Schertz corner is soft from standing water, we fix drainage in the same scope as slab repair. Piering without drainage is like fixing a roof leak without replacing the flashing.
What to Expect
Most drainage projects take one to three days. Trenches along the slab are backfilled and sodded or rocked to match your yard. We document the finished grade so you know water should exit the property, not sit against brick or stem walls.
Book a free drainage and foundation inspection in San Antonio: (830) 244-0222. Serving Bexar, Comal, and Kendall counties.
San Antonio Slab Repair · 454 Soledad Street, 3rd Floor, San Antonio, TX 78205 · (830) 244-0222
Questions & answers
Drainage & Soil Correction
Don't let a small crack become a $15,000 problem.
Foundation issues get worse every month. Our free inspection gives you a clear diagnosis and an honest quote, with no pressure.