What Excavation Costs in Utah County
A basement dig, a footing trench, and a pool excavation are all priced the same way — by the cubic yard, with soil conditions and access doing most of the work of separating a cheap bid from an expensive one. The gap between a low quote and a high one is almost never labor. This guide covers what actually drives the price on a residential or small commercial dig.
How excavation is priced
Excavation is priced by volume — cubic yards of material moved — not by square footage or by the hour, though small jobs sometimes get quoted as a flat price once the yardage is worked out. A basement dig for a typical home runs somewhere between 150 and 400 cubic yards depending on depth and footprint; a footing trench for an addition might be 20 to 60.
The rate per yard falls as the job gets bigger. A 20-yard footing dig and a 2,000-yard commercial pad are different pricing problems even though the same machines do both — mobilization, setup, and access constraints are a bigger share of the cost on a small job than a large one.
What actually moves the price
Volume sets the baseline. These are the variables that separate a $6,000 basement dig from a $20,000 one:
- Soil type — sand and loose gravel dig fast; dense clay and hardpan slow the bucket down and wear equipment harder
- Rock — hitting bedrock or large boulders changes the job entirely; see our rock excavation guide for what that costs on its own
- Water — a high water table means dewatering, sloped cuts instead of vertical ones, and sometimes shoring, all before the real work starts
- Access — a tight side yard, an existing fence line, or mature trees to protect means smaller equipment and more hand work
- Haul distance — dirt has to go somewhere; a site with room to spoil material on-site is cheaper than one that requires trucking it off
- Depth — every additional foot past about 6 feet usually requires sloped cuts or shoring for safety, which adds both time and material
Basement and foundation digs
Basement excavation is its own category because the tolerances matter more than the volume. The dig has to hit the exact elevation the foundation plans call for, on all four sides, with room for the crew to work the forms. Over-digging past plan grade means importing and compacting fill to get back to grade — a cost a careful excavator avoids by digging to the line, not past it.
Utah's frost depth (30 inches through most of Utah County) sets the minimum footing depth regardless of basement depth, which is why even a home without a basement still needs real excavation at the foundation.
Why the lowest bid usually assumes the best case
Excavation bids vary because contractors are pricing what they expect to find underground, and nobody can see through dirt. A bid that assumes easy digging, no water, and no rock will always beat one that prices contingency for those things — until the bucket hits something the first bid didn't account for, and the difference shows up as a change order instead of in the original number.
The useful question when comparing bids isn't the total. It's what each one assumes about soil, water, and rock, and what happens contractually if the site doesn't match those assumptions.
Utah County market ranges — residential and small-site excavation
2026 Utah market ranges for basement, footing, and small commercial excavation, drawn from published contractor pricing guides and Utah-specific cost data. These are market figures for comparison, not a Cadoava quote — every dig is priced off its own soil, water, and access conditions. For acre-scale earthwork, see our site preparation cost guide.
| Item | Typical range | What it covers |
|---|---|---|
| Small dig, easy soil (footings, small additions) | $40–$90 / CY | Dry, diggable soil with reasonable access; mobilization is a bigger share of cost on small volumes |
| Full basement excavation | $6,000–$20,000 | Typical range for a residential basement dig, depending on size, depth, and soil |
| Difficult soil or restricted access | $90–$194 / CY | Dense clay, wet ground, or a site that needs smaller equipment and hand work |
| Footing trench | $8–$20 / linear ft | Depth and soil-dependent; Utah frost-depth footings run a minimum of 30 inches |
Rock changes this math entirely — see our rock excavation guide. Utah's frost depth requires footings at least 30 inches deep regardless of whether the home has a basement.
Frequently Asked Questions
How much does it cost to excavate a basement in Utah?
Most residential basement digs in Utah County run $6,000 to $20,000, depending on size, depth, and what the soil does. Dense clay, a high water table, or tight access all push that number up; open, dry, easy-access lots push it down.
Is excavation priced by the hour or by the yard?
By the cubic yard, almost always. A contractor may quote a flat price for a small job, but that price is still built off the estimated yardage. Ask what yardage a bid assumes — it's the fastest way to compare two quotes on the same job.
What's the difference between excavation and site preparation?
Excavation is the digging itself — basements, footings, trenches, pools. Site preparation is the larger process of taking a raw lot to a build-ready pad, which includes excavation along with grading, cut-and-fill balance, and drainage. See our site preparation cost guide for that larger scope.
Does Cadoava do residential excavation?
Yes. We self-perform excavation with our own fleet — basements, footings, pools, and utility trenches — across Utah County, the Heber Valley, and Park City. Send us the plans or the address and we'll tell you what we see.