Foundation Excavation in Austin & Central Texas
Engineered plan required
Foundation excavation is the dig for a slab, pier-and-beam or stepped foundation, cut to your engineer's plan. We work for builders, GCs and owners in Austin and Central Texas. Most foundations run $15,000–$28,000 per structure, with spoil haul and bearing-surface prep included. Rock is billed per cubic yard. Most digs take one to four days on site.
Every Foundation Type,
Dug to Spec.
The scope changes with what is being built, what the engineer specified and what the ground is doing. We work from your structural drawings. The price for each type below sits inside the range above and is set from your plans and the site walk.
New Custom Homes
Slab-on-grade, pier-and-beam and basement foundations. We dig to the engineer's plan: footer widths, depth to bearing, interior grade beams, and any drilled piers flagged for coordination.
ADUs + Garage Conversions
Accessory dwelling units, detached garages and backyard structures. Tight access is common, so we use compact equipment, plan spoil handling and confirm clearance before we mobilize.
Additions + Extensions
Ground-floor additions have to match the existing floor elevation, protect the current foundation and tie in the new footer. We work slowly at the joint between old and new.
Commercial + Multi-Unit
Small commercial buildings, duplexes, fourplexes and infill multi-unit. Larger footprint, more spoil, more drainage staging. We coordinate with your GC's schedule and phase the work when the build requires it.
Infill Lots: Urban + Tight
Central Austin infill lots often mean zero-lot-line digs, adjacent structures, protected trees and a narrow driveway. See tight lot and legacy tree excavation for how we plan those.
Sloped + Stepped Foundations
Hill Country lots often need stepped footings and terraced cuts. We work from the civil and structural drawings together: cut elevations, step locations, bench widths and drainage away from the foundation. Pad and drainage work is covered under grading and drainage.
We Dig From the
Engineer's Drawings.
We work from the structural engineer's foundation plan. Footer dimensions, bearing depth, step locations and setbacks are confirmed before we move dirt.
If your plans aren't final, we give you a range. When they're stamped, we lock the number.
- Footer width and depth checked against the structural spec before the dig
- Bearing surface elevation held to the tolerance your engineer specifies
- Step locations on sloped lots marked and cut per plan
- Drainage slope away from the footprint per the civil grading plan
- Rock conditions reported to you as we find them
- Final photos sent before we leave, so your GC and engineer can review remotely
What You Hit Depends on
Which Side of the Balcones Fault.
West of the Balcones Fault, Edwards and Glen Rose limestone sit at or near the surface. East of it, you dig Austin Chalk and Blackland Prairie clay. They dig differently, and both can put rock in the footer.
| Area | Near-surface material | What it means for the dig |
|---|---|---|
| West of the fault (Hill Country, western Travis County) | Edwards and Glen Rose limestone, thin soil | Rock often reaches footer depth. Plan for the hydraulic hammer. |
| East of the fault | Austin Chalk, Blackland Prairie clay | Softer to cut, but chalk can need extended break time and clay moves with moisture. |
Rock is billed per cubic yard: $35–$45 per cubic yard for rippable caliche and soft limestone, $65–$90 per cubic yard for hard rock that needs the hammer. When the volume can't be known ahead of time, hammer work can be billed by the hour. A drone models the ground surface. Rock, footings and buried lines below the surface are found with test holes, probing, 811 locates and GPR where needed. For the full breakdown see limestone and rock excavation.
Four Scope Items,
All in Your Quote.
Perimeter + Interior Footer Excavation
The main foundation perimeter plus interior grade beams and footer locations per the structural plan. We mark and confirm locations before digging.
Bearing Surface Prep
The footer bearing surface is finished to the engineered elevation and cleared of loose material, so your concrete crew can form and pour without re-grading. Your engineer and inspector confirm it, not us.
Rock Assessment + Breaking
We assess conditions on the site walk, give you a range before you commit, and bring an excavator with a hydraulic hammer when the ground calls for it. It is the same machine, so there is no second mobilization for the hammer.
Spoil Haul + Grade Restoration
Excavated material is hauled off and adjacent grade is left workable for framing and deliveries. No loose spoil pile against the future foundation walls.
We Fit Into
Your Build Schedule.
Foundation Dig Sits at the Front of Your Schedule
If the dig slips, everything behind it slips. We set the start date when you confirm the plan is final. Most jobs start 1–3 weeks after approval.
We talk directly with your site super. Final photos go out before we leave, and any rock or soil surprise is flagged in writing so you have it for your engineer.
We Pull Dimensions From the Stamped Plan
We confirm bearing elevations against the plan and flag discrepancies before we dig.
If site conditions differ from what the plan assumed, such as rock at a different depth or soil that doesn't match, we document it and call before continuing. As-dug photos and field notes are available for your project file.
Plan Review to
Pour-Ready Handoff.
Send the plans, get a quote
Send the structural drawings or a PDF of the foundation plan. We quote from the dimensions. If plans aren't final we give a range, and the price locks when they are stamped.
We walk the lot before we schedule equipment
Access route, overhead clearance, adjacent structures, utilities and ground conditions. Any rock flags reach you before you commit your concrete crew to a pour date.
Layout is confirmed before the first pass
Footer locations are staked or marked per plan and confirmed with your GC or super. If setbacks, an adjacent structure or a tree root zone don't match the plan, we flag it before moving dirt.
Excavate to plan
Perimeter cut, interior footers, bearing surface finish. Hydraulic hammer if rock shows up at footer depth. Step cuts per plan on sloped lots.
Spoil haul and handoff
Material hauled off, adjacent grade left clear for forming and deliveries. Photos of the bearing surface and footer cuts go to you before we leave.
What Foundation Excavation
Costs in Austin.
Footprint, foundation type, ground conditions and access set the price. These ranges are our rate card for Austin and Central Texas, not a national cost database.
| Line | Unit | Range | What moves it |
|---|---|---|---|
| Foundation excavation with spoil haul and bearing-surface prep | per structure | $15,000–$28,000 | Footprint, foundation type, access, spoil volume |
| Rippable caliche and soft limestone | per cubic yard | $35–$45 | Hardness and thickness |
| Hard rock that needs the hammer | per cubic yard | $65–$90 | Hardness, volume, whether the volume is known |
| Mobilization | per job | $725 | Distance from Austin |
Prices reviewed: September 2026. Ranges for Austin and Central Texas; your site walk sets the final number.
What GCs + Builders Ask
About Foundation Digs.
How much does foundation excavation cost in Austin?
Most foundations run $15,000–$28,000 per structure, including spoil haul and bearing-surface prep. Footprint, foundation type, access and rock move the number. Send the plans and we quote from them.
Do you need stamped plans, or can you work from a sketch?
We prefer the engineer's foundation plan and can give a range from preliminary drawings. The price locks when the structural plan is final. Footer errors are expensive to fix after the dig.
What does rock cost on a foundation dig?
Rock is billed per cubic yard: $35–$45 per cubic yard for rippable caliche and soft limestone, $65–$90 per cubic yard for hard rock that needs the hammer. When the volume can't be known ahead of time, hammer work can be billed by the hour.
Can you tell me about rock before we break ground?
We walk the site, probe and dig test holes, and give you a written range. A drone models the ground surface. Rock, footings and buried lines below the surface are found with test holes, probing, 811 locates and GPR where needed. Nobody can promise rock depth from the surface, so the range is a range.
What if conditions don't match what the engineer assumed?
We stop, photograph, and call you. You and your engineer decide how to proceed. Field notes and photos go into your project file.
How long does a foundation dig take?
Most residential digs take one to four days on site once the crew is there. Most jobs start 1–3 weeks after approval. Rock, a large footprint or a tight lot adds time.
Do you handle sloped lots and tight lots?
Yes. Stepped footings and terraced cuts are common in the Hill Country. Infill lots with tight access or protected trees are covered on our tight lot and legacy tree excavation page.
Do I need to call 811 before you dig?
Texas law requires a locate request at least two business days before digging. 811 marks public lines only. Private lines on the lot, such as a gas or sewer service to an existing house, are found by probing and hand digging near them.
Sources: Texas811 for locate rules. Last reviewed: September 2026.
Send Us the Plans.
We'll Give You a Real Number.
A PDF or link to your structural drawings is enough. We review, walk the site, and quote in writing. Written quote within 48 hours of the site walk.
Austin and Central Texas · $2M per occurrence / $5M aggregate general liability
Austin & Central Texas · Insured · Written quote within 48 hours of the site walk
Rather talk to a person? (512) 880-8888