GRADELINE county guide
Excavation in Los Angeles County
Soil regimes, rock depth, haul logistics and the contractors who work Los Angeles County, California — the local ground data behind every bid.
Los Angeles County is home to roughly 9,757,179 people, part of the Los Angeles-Long Beach-Anaheim, CA metro area, shrinking about 2.8% over the last five years, covering about 4,060 square miles of land — an urban county of California where site work scales with the building cycle.
Ground conditions
Sierra Nevada excavation country is defined by a steep, dissected upland mantle of decomposed granitic saprolite and, on its northern volcanic slopes, mudflow and ash-flow caprock over the batholith. Saprolite rips easily with a toothed bucket until it unaccountably stiffens into fresh granodiorite corestones and exfoliation slabs, bidders price per ripper-hour and per blasting line-item, not per yard. Slopes commonly exceed 30 percent, cutting temporary bench stability and hauling cycle times; winter storm runoff concentrates in every swale, so cut-and-fill grading needs energy-dissipating outlets and seasonal BMP maintenance. High stony percentages (40-80 percent) are normal on the volcanic caps and glacial outwash, punishing trencher chains and demanding rock-overhang protocols on utility trenches. Septic absorption fails on shallow-to-bedrock and dense claypan interfluves, pushing systems to upslope benches. Wildfire fuel management (defensible-space clearing) and Tahoe/forest-service disturbance rules complicate clearing permits; survey staking must respect historic mine workings on the Mother Lode. Water-table excavation issues are minor except in meadow edges and mountain-valley stream terraces.
Dominant soil textures include sandy loam, silty clay loam, loam; 29.3% of the county has bedrock or a restrictive layer within 50 inches of the surface — rock clauses belong in every bid; 36.3% of the land slopes steeper than 15%, which narrows machine choices and raises erosion-control stakes.
| Soil regime | Sierra Nevada Granitic & Volcanic Uplands |
|---|---|
| Dominant soils | Sandy loam, Silty clay loam, Loam |
| Shallow bedrock (≤50 in) | 29.3% of county |
| High shrink-swell soils | 3.5% of county |
| Slope >15% | 36.3% of county |
Construction demand
Construction demand sets how busy crews are and how far out they book. 9,899 single-family permits were issued in the last 12 months (a +7.2% three-year trend), and 22,446 total housing units across all types, and About 97,612 residents work in construction, and 365 site-prep establishments are registered in the county.
Water, septic & flood
Water decides more site outcomes than any other input. In this county, 61.2% of soils carry severe limitations for conventional septic drain fields, so perc tests and alternative systems are common here, and 28.2% of the county sits in a mapped FEMA flood zone.
Water & ground hazards
Water and geology set the site rules here: 14.6% of the county maps as NWI wetland, so wetland delineations are common on bigger parcels; 28.2% of the county sits in a mapped FEMA flood zone, which triggers floodplain development permits for earthwork in those areas.
Rough cost estimator
Bulk excavation is commonly priced per cubic yard — roughly $2 to $8 for ordinary soil and far more where rock must be hammered, which applies to a meaningful share of this county. Use the table for ballpark volumes, then confirm with line-item bids from Los Angeles County crews.
| Project volume | Typical range | What it covers |
|---|---|---|
| 100 cubic yards | $200 – $800 | Pool hole or small trenching job, easy soil |
| 500 cubic yards | $1,000 – $4,000 | House pad cut or driveway cut on easy ground |
| 1,000 cubic yards | $2,000 – $8,000 | Basement dig or modest site cut, before hauling |
| Rock excavation | $40 – $100+ / cubic yd | Hammered or blasted rock, priced separately |
| Machine + operator | $100 – $250 / hr | Hourly rate for mid-size excavator or dozer |
National ranges, not a quote: bulk excavation is usually priced per cubic yard, roughly $2 to $8 for ordinary soil and $40 to $100 or more where rock has to be hammered or blasted. Rock, groundwater and haul distance move the number most.
Excavation contractors in Los Angeles County
Published listings from the GRADELINE directory, ranked by rating. Every crew serves its own radius — confirm coverage for your address.
01. Bob Wareham Excavating Inc
San Dimas, CA
02. So Cal Construction General Engineering, Inc.
Lancaster, CA
03. Barkley General Engineering
Acton, CA
04. R & S Utility Construction
Santa Clarita, CA
Lancaster, CA
Common questions
What is the ground like in Los Angeles?
Sierra Nevada excavation country is defined by a steep, dissected upland mantle of decomposed granitic saprolite and, on its northern volcanic slopes, mudflow and ash-flow caprock over the batholith. Saprolite rips easily with a toothed bucket until it unaccountably stiffens into fresh granodiorite corestones and exfoliation slabs, bidders price per ripper-hour and per blasting line-item, not per yard. Slopes commonly exceed 30 percent, cutting temporary bench stability and hauling cycle times; winter storm runoff concentrates in every swale, so cut-and-fill grading needs energy-dissipating outlets and seasonal BMP maintenance. High stony percentages (40-80 percent) are normal on the volcanic caps and glacial outwash, punishing trencher chains and demanding rock-overhang protocols on utility trenches. Septic absorption fails on shallow-to-bedrock and dense claypan interfluves, pushing systems to upslope benches. Wildfire fuel management (defensible-space clearing) and Tahoe/forest-service disturbance rules complicate clearing permits; survey staking must respect historic mine workings on the Mother Lode. Water-table excavation issues are minor except in meadow edges and mountain-valley stream terraces. About 29.3% of the county has rock or a restrictive layer within 50 inches of the surface.
How many excavation contractors work in Los Angeles?
GRADELINE lists 5 published excavation and site work contractors for Los Angeles, California. Search the directory by ZIP to see who covers your address.
Sources & data
- USDA NRCS SSURGO county soil data (ground conditions, shrink-swell, water table)
- FEMA National Flood Hazard Layer (floodplain share)
- US Census Building Permits Survey (construction demand)
- County permit authorities (grading, septic, burn permits)
- 811 Before You Dig, Common Ground Alliance
This guide is general information, not legal or engineering advice. Permit thresholds, fees and restrictions are set by Los Angeles County and California agencies; confirm with the county before work starts.