Grading, Topsoil & Dirt Work in Phoenix, AZ

Grading, topsoil and dirt work decide whether a Phoenix lawn or seeded slope succeeds before any seed is mixed. A yard that drains toward the slab, a lot compacted by months of equipment traffic, or a surface left as bare subsoil after a builder's cut will undo the best hydroseed application. We handle yard grading and land grading, ripping and tilling, fine grading, topsoil delivery and spreading, and drainage swales, so the ground is ready when we seed it. The same equipment and operators dig drainage trenches and do small excavation jobs too: French drains, buried downspout lines and shallow runs to basins.

What Valley ground looks like after construction

Away from the mountains, Phoenix is generally flat, so small grade mistakes matter. On a flat lot, a low spot of an inch or two holds water against a wall or turns a corner of the lawn into a puddle after every monsoon storm. Much of the valley floor is old fan and stream alluvium. The USDA's Mohall series, typed in Maricopa County, is a sandy loam at the surface over a lime-rich calcic horizon starting 20 to 40 inches down, with moderately slow permeability. Builders compact pads hard for slabs, and that compaction often spreads into the yard. We break it up so roots and water can get down.

Yard grading for drainage

Good yard grading sends water off the foundation toward a planned outlet: a retention area, a yard drain or the street, depending on what the lot's drainage plan allows. In Phoenix many subdivisions rely on on-lot or shared retention, so we check where the water is supposed to go before we move dirt. Then we set grades, cut and fill, and fine grade the surface smooth enough for seed. On lots where a swale runs along the property line, we shape it so it carries water without cutting.

Topsoil, and when you need it

Not every yard needs imported topsoil. Where the native sandy loam is intact, ripping and adding organic amendment may be enough. Where grading has exposed subsoil, rock or construction fill at the surface, a few inches of screened topsoil gives seed something to root into. Cost guides put bulk topsoil at roughly $10 to $55 per cubic yard plus delivery, with spreading billed by the hour. We tell you whether it is worth it on your lot.

Get a Free Estimate

Permits for dirt work in Phoenix

The City of Phoenix requires a grading permit for grading, filling or excavating unless the work fits narrow exceptions, and those exceptions only apply while total land disturbance stays at one acre or less. Among them: excavation less than two feet deep that does not create a cut slope over five feet high and steeper than 1 to 1.5, and fill less than one foot deep, on terrain flatter than 1 to 5, not over 100 cubic yards on the site and not blocking a drainage course. Work in a wash or flood hazard area, or on land zoned as hillside, needs a permit regardless. Most residential yard grading falls within the exceptions, but not all of it; we check before we dig.

Dust while we work

Graded dirt in Phoenix is a dust source, and the PM10 dust that blows off disturbed construction sites is one of the things linked to Valley Fever in the region. We water down work areas as we go and aim to seed or cover graded ground soon after we finish, rather than leaving it bare for weeks.

The lime layer under the yard

The calcic horizon the USDA describes in Mohall soils is a layer where calcium carbonate has built up as filaments, masses and concretions. Homeowners often call any hard, whitish layer caliche. It does not usually stop a lawn on its own, but it slows water moving down, so heavy irrigation can perch above it and keep the root zone soggy while the surface looks dry. When we hit a hard layer in a lawn area, we tell you how deep it is, and if drainage is a problem we can break through it in spots or route water away with a swale or drain rather than burying it under more fill.

Timing grading around storms

We prefer to grade lawn and slope areas in late spring or after the monsoon, then seed or cover right away. Grading in July and leaving the dirt open is the riskiest plan: a single storm can rut a fresh fine grade and push it onto the patio or into the street. When a summer schedule cannot be avoided, we grade in smaller sections and cover each one before moving on.

Typical dirt work jobs

• Regrading a yard that drains toward the house
• Ripping and fine grading a new-build backyard
• Topsoil for a lawn area that was left as subsoil
• Swales and shallow trenches to a retention area
• Leveling low spots before a lawn renovation