Site Prep & Grading — Why the Base Matters More Than the Surface
Most concrete failures start at the bottom, not the top. A slab that cracks, sinks, or pushes water toward a foundation usually got that way because the ground underneath wasn't ready when the concrete was poured. Bad grading. Soft spots that weren't dug out. Not enough compaction. These aren't problems you can fix after the pour; you have to get them right before.
If you've watched a driveway or patio slowly sink toward one corner, or seen water pool against a garage floor after every rain, that's almost always a base problem. Concrete itself is hard and durable. What fails is what's underneath it.
We do site prep and grading as part of every concrete job we take on — driveways, patios, slabs, pool surrounds, commercial pads. We also do stand-alone grading and excavation for property owners who need the ground ready before a project begins. Either way, the goal is the same: a flat, compacted, properly drained base that gives concrete something solid to sit on.
What Site Prep and Grading Actually Means
Grading is the process of shaping the ground so water drains away from structures rather than toward them. That means cutting down high spots, filling and compacting low spots, and establishing a slope that moves water where it should go.
Site prep goes a step further. Before any concrete is poured, the ground underneath needs to be excavated to the right depth, stripped of any soft or organic material, and compacted. In Illinois, we also account for freeze-thaw cycles. Soil that heaves in winter will move concrete with it. Proper base depth and compaction are what keep that from happening.
Here's what sets us apart: we run our own equipment. We're not calling a separate excavating company and waiting for their schedule. Our crew handles the grading and prep, then handles the pour. One crew, start to finish. That matters because the people doing the pour are the same ones who prepared the base. Nothing gets handed off and nothing falls through the gap between two separate contractors.
We've been doing this work out of Freeburg for 20 years across St. Clair, Madison, and Monroe County. We know what Illinois soil does across seasons, and we grade for that reality, not for a dry-season ideal that won't hold up once the ground starts moving.
When You Need Site Prep or Grading
You're pouring new concrete on a raw site. Whether it's a driveway, a pad, or a full construction project, the ground has to be prepped before concrete is poured. Skipping or rushing this step is the single biggest reason new concrete fails early.
Water is going where it shouldn't. If rain or snowmelt is pooling against your house, garage, or existing concrete, the grade is working against you. Regrading the surrounding area can redirect that water before it causes foundation or drainage problems.
You're replacing old concrete that kept sinking. When a driveway or patio has been sinking for years, the reason is usually a base that was never properly compacted, or one that's shifted over time. Before we pour new concrete in that spot, we excavate, correct the base, and compact it so the new surface doesn't do the same thing.
You're prepping for a pool or large addition. Inground pools require significant excavation and precise grading around the shell and deck area. Because we build concrete and gunite pools and pour the surrounding decks, we control the entire site from dig to finish. See our Inground Pool Construction page for more on how that works.
Our Process
1. On-site assessment. We look at the existing grade, drainage patterns, soil type, and what the finished surface needs to carry. We don't quote grading work without seeing it.
2. Excavation. We dig to the required depth for the project type. For driveways, that's typically 6 to 8 inches below the finished surface to allow for base material and concrete thickness. We remove soft spots, roots, or anything that won't compact solidly.
3. Base material and compaction. After excavation, we bring in and compact the appropriate base material, usually compacted gravel or crushed stone. This is what the concrete actually rests on, and it has to be done in lifts, not all at once.
4. Final grade and slope check. Before any concrete goes in, we confirm the slope is moving water in the right direction. For driveways and patios, that typically means a 1-2% slope away from the structure.
5. Pour coordination. Because we handle both prep and pour, there's no scheduling gap. The concrete goes in once the base is ready, not days later after it's had a chance to shift or take on water.
6. Debris hauling. Excavation produces material that has to go somewhere. We run our own dump trucks, so spoil, old base material, and debris get hauled off as part of the job. See our Dump Truck Hauling Service page for standalone hauling needs.
What Site Prep and Grading Costs
Grading and excavation costs vary based on the size of the area, how much material needs to be moved, what condition the existing ground is in, and whether you need hauling included.
Small prep jobs for a single driveway or pad cost significantly less than site work for a full pool project or large commercial area. Regrading a yard for drainage is priced differently than excavating for new concrete.
The honest answer is we need to see the site before we can give you a number that means anything. Estimates are free, and we'll come out, assess the ground, and give you a clear price before any work starts. Call us at 618-514-2663 or reach out at richie@customconcretesite.com.
Where We Work
We do site prep, grading, and excavation across a three-county area: St. Clair County, Madison County, and Monroe County in southwestern Illinois.
Our primary markets include O'Fallon, Belleville, Fairview Heights, Shiloh, and Swansea in St. Clair County; Edwardsville, Collinsville, Glen Carbon, and Troy in Madison County; and Waterloo and Columbia in Monroe County. We also work in smaller surrounding communities throughout the Metro East.
If you're not sure whether you're in our range, call us. We're based in Freeburg and most of the area is a short drive.
Related Services
If your project involves grading, it likely connects to one of these:
Concrete Demolition & Haul-Away Old concrete has to come out before new prep begins. We break it up and haul it off with our own trucks, so you're not coordinating a separate demolition crew.
Dump Truck Hauling Service Grading and excavation generates material that needs to move. We haul dirt, gravel, and debris across the Metro East as a standalone service or as part of a larger project.
Inground Pool Construction Pool builds require precise excavation and grading before the shell goes in. Because we handle the dig, the pool, and the deck, the site prep is built into the project from the start.
Concrete / Gunite Pool Build Gunite pools need a clean, properly shaped excavation. We handle that in-house so the pool shell goes into a site that's ready for it.