Excavation cost in Northern California runs about $1,500 to $7,000 for a small residential dig, $8,000 to $50,000 or more for a foundation or full site cut, and $210 to $370 an hour when a job is billed by time. Hardpan or rock can add $20 to $50 a cubic yard on top of that, and it's the single biggest variable in any bid.
If you've gotten three quotes for the same job and they came back $6,000 apart, you're not being scammed. You're seeing what happens when three contractors dig a few test holes and hit three different answers about what's under your topsoil. We've cut pads in Corning where the first four feet were easy loam and the fifth was decomposed granite that ate a bucket tooth. That one change in the dirt is why excavation pricing looks so inconsistent from the outside.
What actually drives the cost
A house pad in flat, rock-free ground in the Sacramento Valley bottomland around Corning or Los Molinos costs a fraction of the same size pad on a bench above Paradise or in the foothills east of Redding. Four things move the number more than anything else on any excavation project.
Soil and rock. Clay, loam, and sandy soil move fast. Hardpan, which is common through Tehama and Shasta counties, and granite, which shows up more as you climb toward Redding and the foothills, slow a machine down and wear out teeth and buckets. Expect $20 to $50 more per cubic yard once you're out of native soil and into hardpan, and significantly more if you need to rip or hammer through rock.
Access and slope. A lot with a wide gate and flat approach lets a full-size excavator work efficiently. A tight urban lot, a steep driveway, or a hillside parcel with no room to stage spoils can add 15 to 30 percent, mostly from smaller equipment, more trips, and slower, more careful work.
Depth and volume. Cubic yards moved is the real unit of the job, not square footage. A shallow footing trench and a full basement excavation on the same size house are two completely different jobs.
Permits and utility locates. Grading and excavation permits vary by county and by how much dirt you're moving. Tehama, Butte, and Shasta counties each set their own thresholds for when a grading permit kicks in, so what's exempt in one county isn't automatically exempt in the next.
Typical excavation cost ranges
| Project type | Typical cost range | What changes it |
|---|---|---|
| Utility trench or footing trench | $500 to $3,000 | Depth, length, and whether it hits rock |
| House pad or addition footprint | $1,500 to $10,000 | Square footage, cut/fill balance, access |
| Full foundation or basement dig | $8,000 to $30,000 | Depth, soil hauling, shoring needs |
| Large commercial or municipal cut | $20,000 to $50,000+ | Volume, engineering specs, compaction testing |
| Hourly rate (excavator + operator) | $210 to $370/hour | Machine size, job complexity |
These are general market ranges we've seen across Northern California, not a quote. Every site is different once you get a bucket in the ground, which is exactly why we walk the property before putting a number on paper. You can request a free estimate and we'll tell you what your specific lot is likely to run.
Why hourly rates swing so much
An hourly rate covers more than diesel and a seat. It covers the size of machine that fits the job, the operator's skill at reading the ground in real time, and how much of the day gets eaten by things that aren't digging: moving spoils, protecting a neighbor's fence, working around a septic line nobody marked on the original survey.
A mini excavator for a small trench might run $150 to $220 an hour. A mid-size machine sized for a house pad runs closer to $250 to $370. Bring in a larger machine for a commercial cut or a demolition-adjacent job and the hourly number climbs again, but the job usually finishes faster, so total cost can come out about the same or lower. That's the trade-off worth asking about: a smaller machine at a lower rate isn't always the cheaper choice once you count hours.
Permits, 811, and the rules before you dig
Two separate requirements apply almost every time dirt moves in California, and they're not the same thing.
A grading or excavation permit is a local matter. Your county or city building department decides whether your project's depth, volume, or slope work needs one, and the threshold is different in Tehama County than it is in Butte or Shasta. Skipping a required permit can stop a project mid-dig and force costly rework to meet inspection.
Calling 811 before you dig is a state law, not optional, and it has nothing to do with permits. California requires you to contact the regional notification center at least two working days, and no more than 14 calendar days, before excavation begins, so utility operators can mark buried lines. The CSLB explains what happens if you skip this step, and it isn't a small fine. Any trench deeper than five feet also falls under Cal/OSHA's shoring and sloping rules, which is one reason a DOSH-certified crew matters once a job goes below that depth.
When to schedule the dig
Northern California's dry stretch, roughly June through October, is the window when excavation moves fastest. Ground is stable, equipment doesn't bog down, and there's no rain delay eating into the schedule. Once the wet season sets in from November through March, clay soils in particular turn to a mess that can shut a site down for days after a single storm, and grading work generally slows across the region.
If your project isn't urgent, we'd rather wait two weeks for a saturated site to dry out than cut corners on compaction. A pad that's dug and backfilled while the subgrade is too wet doesn't compact to spec, and that shows up as cracking or settling a winter or two later. Get the timing right and the foundation holds. Get it wrong and you're paying to fix it after the fact.
When excavation turns into a bigger job
Excavation rarely happens in isolation. Digging a house pad usually means grading and compaction after the cut, and a foundation dig on a fire-damaged lot often follows fire cleanup and debris removal before anyone can break ground on a rebuild. If the dig turns up an old slab or foundation that needs to come out first, that's a separate line item, and pricing it apart from the excavation keeps the bid honest. And once concrete or asphalt comes out of the ground, mobile concrete crushing only pencils out above a certain volume. For a single driveway or small foundation, hauling the material to our recycling yard is usually the cheaper move.
Common Questions
How much does it cost to excavate a foundation in California?
A full foundation or basement excavation in Northern California typically runs $8,000 to $30,000, depending on depth, soil conditions, and whether the spoils need to be hauled off site or can be used as backfill elsewhere on the property.
Do I need a permit to excavate on my property in California?
It depends on your county and the scope of the work. Tehama, Butte, and Shasta counties each set their own thresholds for when a grading or excavation permit is required, so check with your local building department before you dig, separate from the mandatory 811 utility locate.
How much extra does rock or hardpan add to an excavation job?
Hardpan and decomposed granite, both common in the foothills around Redding and parts of Tehama County, typically add $20 to $50 per cubic yard compared to native soil, and true bedrock can cost more depending on whether it needs ripping or hammering.
What is 811 and do I have to call before I dig in California?
811 is the number for California's regional utility notification centers. State law requires anyone excavating to call at least two working days, and no more than 14 calendar days, before digging so utility companies can mark buried lines. This applies regardless of whether a local permit is also required.
How long does excavation take for a house pad or addition?
A straightforward house pad dig in cooperative soil often takes two to four days once equipment is on site, not counting time waiting on permits or utility locates. Rock, wet ground, or difficult access can stretch that considerably.
Bottom line
Excavation cost comes down to what's actually in the ground, not the square footage on your plans, and the only way to get a real number is to have someone walk the site and dig a few test holes. If you're planning a project anywhere in Corning, Chico, Redding, Red Bluff, or the surrounding Tehama, Butte, and Shasta county area, Walberg, Inc. has been reading Northern California dirt since 1999 and can tell you what your specific lot is likely to run. Request a free estimate and we'll get eyes on your site before you commit to a budget.