What April Drainage Problems Mean for Houston Foundations

April is the month Houston clay soil gets its worst workout. We average around 4 to 5 inches of rain in April alone, and that water has to go somewhere. If your yard isn't draining away from the house, it's soaking into the soil right against your foundation — and that's where trouble starts.

Houston's expansive clay soil swells when wet and shrinks when dry. That constant movement puts lateral pressure on slab foundations and causes differential settling. You won't feel it happening, but you'll see it: doors that stick, drywall cracks above windows, gaps forming where the wall meets the ceiling.

Here's what I look for on every inspection. Positive drainage means the yard slopes away from the house — at least 6 inches of drop over the first 10 feet. Most problem homes I inspect in Alvin, Angleton, and the Manvel area have flat or negative grades that funnel water straight toward the slab. That's a defect I report every time.

Downspout extensions matter too. A downspout that dumps water 6 inches from the foundation is almost as bad as no gutters at all. Extensions should carry water at least 4 to 6 feet away from the house, and ideally away from neighboring lots too. I see short or missing extensions constantly on homes built in the 1990s and early 2000s.

Foundation repair in the Houston area runs $3,000 on the low end for a couple of piers. A serious job with 15 to 20 piers can hit $10,000 to $20,000 or more. Fixing the drainage that caused it costs a fraction of that — usually $500 to $2,000 for regrading and proper extensions.

If you're buying a home right now in Pearland, Dickinson, or anywhere in Galveston County, ask me to pay close attention to drainage during the inspection. April rain is actually the best time to catch these problems. The evidence is fresh and visible.

You don't have to be an expert to spot early warning signs. Walk your yard after the next heavy rain. If water is pooling within 10 feet of the house and hasn't drained in 30 minutes, that's a problem worth addressing before it becomes a foundation problem.