Drainage Grading & Topsoil in Houston, TX

Drainage grading and topsoil work is where most of our Houston lawns actually start. On ground this flat, the difference between a yard that drains and a yard that holds water for three days is a few inches of fall spread across the lot. We do yard grading and land grading, bring in and spread topsoil, fill low spots, and fine grade the surface so it is ready for seed. Homeowners call us when water stands near the slab or in the middle of the yard after every storm. Builders and site contractors call for finish grading before final seeding.

Why grading matters more in Houston

Much of the city sits on low-permeability clay-silt prairie soils, which Wikipedia lists alongside flat topography as reasons many parts of Houston face localized flooding. The land surface rests on unconsolidated clays and poorly cemented sands, with heavy clay through most of the region and sandier ground mainly near floodplains. Clay this tight barely absorbs a hard rain, so the only way to keep a yard dry is to shape the surface so water moves to a street, a swale or a drain. Seed sprayed over a yard that ponds will drown in low spots and wash on the edges.

Yard grading and fine grading

For most lawns, the job is to set a gentle, even slope away from the house toward the street, side swales or a drain. We check grades with a laser or transit, cut high spots, fill low ones and then fine grade the top inch or two so the surface is smooth and firm but not packed. Builder lots often need this even when they look finished, because ruts from trucks and settled utility trenches create low lines across the yard.

Topsoil

Many new lots are left with subsoil clay at the surface after the site work. Spreading a layer of good topsoil over loosened clay gives seed a better start and helps roots move down. We look at what is there before recommending how much to bring in; on some lots a thin layer to fill and level is enough, and on scraped lots more is needed. Where the native surface is already dark, loamy topsoil, we may only need to loosen and level it.

Dirt work beyond the lawn

Some drainage problems need more than reshaping the surface. Our dirt work includes cutting swales between houses, building up low corners with fill, setting grade around raised pads, and excavation and trenching for drainage pipe, French drains and downspout lines. We look for where the water is coming from as well as where it needs to go, since an uphill neighbor's runoff or a buried downspout can undo a perfect grade.

Raised pads and floodplain lots

Since 2018, Houston has required new homes in the 100- and 500-year floodplains to be built two feet above the 500-year flood level. On many lots that means a pad of fill with slopes falling away to the original grade. Those slopes need to be graded smooth and covered quickly, and they cannot direct water onto the neighbor's yard. We grade them, add topsoil and hydroseed or blanket them in one job.

Timing grading with the weather

Wet clay smears and compacts when equipment runs over it, so we grade when the soil is dry enough to crumble rather than stick. In Houston that can mean waiting a day or two after a heavy rain. NOAA normals show February and March as the driest months at Bush Intercontinental, which makes late winter a good window for heavy grading on sites that will be seeded in spring. For a lawn that needs grading and seeding in summer, we schedule the two close together, since a freshly graded yard is at its most vulnerable until grass covers it.

What grading costs

HomeAdvisor's lawn leveling range is $1 to $2 a square foot, with hourly rates of $50 to $100. Lawn Love lists fine grading at 8 cents to $1.00 a square foot and residential resloping at $770 to $3,000. Angi prices topsoil at $10 to $55 per cubic yard, with delivery at $50 to $150 per trip for up to 15 cubic yards. Your price depends on how much soil moves, access for equipment and how much topsoil comes in, and our quote breaks those out.