Excavation
Contractor
Sonoma County
Licensed, CSLB-insured excavation serving Santa Rosa, Windsor, Healdsburg, Petaluma, the Russian River corridor, and the Sonoma Coast. Over a decade of local experience, precise, affordable, and accountable from first dig to final handoff.
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Call us directly for a free project consultation. We serve Sonoma County, Monterey County, and the California Central Coast.
(707) 601-9091CA LIC #1060838 · Licensed & Insured
DW Excavation, LLC is a licensed California excavation contractor serving Sonoma County since 2013, delivering expert site preparation, grading, trenching, foundation work, and comprehensive excavation services with transparent pricing and owner-led accountability on every project. We work throughout the county, from the Santa Rosa metro and Alexander Valley to the Russian River corridor, the Sonoma Coast, Sonoma Valley, and south county.
Sonoma County's Licensed Excavation Team
When searching for a trusted excavation contractor in Sonoma County, homeowners and developers need more than just equipment. They need a team with the expertise, licensing, and reliability to get the job done right. At DW Excavation, LLC, we bring over a decade of hands-on experience, combining affordable service, high-quality workmanship, and a genuine commitment to every project we take on.
What sets us apart is our ability to deliver comprehensive excavation solutions tailored to your site's unique needs. From site planning and trenching to grading, pond excavation, road construction, underground utility installation, and eco remediation, we offer a complete range of services supporting both residential and commercial projects across Sonoma and Monterey Counties.
Our Excavation Services in Sonoma County
DW Excavation delivers a full range of excavation services tailored to both residential and commercial jobs, ensuring clean, efficient site preparation with precision and professionalism.
- Land Clearing & Preparation · We clear brush, trees, and debris, strip organics, and balance or export spoils to create a stable, build-ready surface. Protection of retained assets and sediment controls keeps the work area tidy and compliant from the first cut.
- Trenching for Utilities · Our team installs trenches for water, sewer, electrical, and communications with precise depths, bedding, and backfill, keeping separations and cover in line with typical codes. Safe ingress and egress, spoil placement, and traffic control minimize disruption and risk.
- Foundation Excavation · We cut, over-excavate when needed, and fine-grade building pads for structural reliability, managing export and import to hit target elevations. Clean edges, correct setbacks, and drainage awareness prepare your foundation crew for a faster, cleaner pour.
- Grading Services · From rough cut to finish grade, we shape sites to design elevations for pads, roads, and landscape, prioritizing positive drainage and erosion control. Our grading supports stability, stormwater intent, and inspection readiness throughout construction.
- Pond Installation · We excavate, contour, and compact ponds for irrigation, habitat, or aesthetics, evaluating soils, water table, and inflow and outflow to promote stability. Liners, berm shaping, and spillway considerations are planned up front to reduce seepage and erosion.
Benefits of Hiring DW Excavation
DW Excavation not only prepares your site but also provides tangible advantages that make the project smoother, safer, and smarter.
- Licensed & Insured · Full peace of mind knowing our work meets California state standards under a valid CSLB license (CA LIC #1060838).
- Experienced Local Team · Over a decade of practical, on-the-ground experience in Sonoma and Monterey Counties.
- Affordable, Transparent Pricing · Clear, itemized quotes designed to optimize your budget without compromising quality or timeline.
- Comprehensive Solutions · One contractor handles planning, grading, utilities, pond installation, remediation, and more, which means fewer handoffs and fewer delays.
- Environmentally Aware · We prioritize eco-friendly practices including erosion control and eco remediation to protect your land and local ecosystems.
Our 4-Step Process
- Consultation & Due Diligence · We walk the site, review goals, soils, access, and utilities, identify permitting needs, and provide a clear scope, sequence, and estimate so you can decide with confidence.
- Buildable Plan, Sequencing & Controls · We translate design into a field-ready plan covering haul routes, staging, erosion controls, safety, and inspection checkpoints, sequenced to keep crews productive and your project moving.
- Precision Field Execution · Operators and labor work to spec with verified elevations, safe trench practices, and clean housekeeping. We coordinate with other trades to reduce conflicts and idle time.
- Closeout, As-Builts & Handover · We finalize grades, stabilize disturbed areas, document utilities and elevations, and hand over as-builts so subsequent trades can mobilize faster and inspectors can sign off smoothly.
Built for Sonoma County Conditions
Sonoma County's rolling clay soils, wildfire-impacted hillsides, and tight permitting environment require a contractor who knows the territory. DW Excavation is based in Windsor. This is our home turf, and we've been working these soils since 2013.
We understand Sonoma County's regulatory environment: grading permits are required for cuts or fills over 50 cubic yards or greater than 3 feet depth, SWPPP stormwater controls are mandatory on most disturbed sites, and Sonoma County's digital C&D tracking requirements apply to construction waste diversion. We handle all of it.
Sonoma County Site Considerations
- Heavy clay soils requiring moisture-conditioning and proper compaction protocols
- Wildfire history creating defensible space and erosion control requirements on hillside lots
- Grading permit thresholds: 50 cu yd or 3' depth triggers Sonoma County permit requirements
- Sonoma County rainwater cistern rebates available (up to $5,000) for qualifying drainage projects
- Atmospheric river weather events, where proper drainage design protects your investment long-term
- Stormwater SWPPP and BMP requirements on all significant earthwork projects
- Permitting jurisdiction splits between Permit Sonoma for unincorporated parcels and city building departments inside the nine incorporated cities
- Parcels inside the California Coastal Zone can require a coastal development permit alongside county grading review
Sonoma County Service Areas
DW Excavation operates across all of Sonoma County with established equipment routes, material suppliers, and inspection workflows. Ground conditions change quickly here, so we plan each region differently. What works on a Santa Rosa infill lot is not what works on a river parcel in Guerneville or a ridge site above Cazadero.
Santa Rosa, Windsor & Fulton
Santa Rosa · Windsor · Fulton · Larkfield-Wikiup · Rincon Valley
The county's population core and our home base. Work here is mostly infill lots, subdivision phases, foundation excavation, and utility trenching on parcels with neighbors on both sides, so staging, haul routing, and dust control matter as much as the digging. Hillside neighborhoods on the north and east edges carry post-fire soil disturbance and defensible space considerations that shape how a pad gets cut. Windsor mobilization keeps travel time and equipment costs low across this whole cluster.
Get a Quote ›Healdsburg, Geyserville & Alexander Valley
Healdsburg · Geyserville · Cloverdale · Alexander Valley · Dry Creek Valley
North county runs to larger acreage, which changes the work. Vineyard site prep, ranch road construction, irrigation pond excavation, and ag grading are common, and parcels off municipal service need well and septic trenching planned alongside everything else. Terrain rises quickly off the valley floor, so cut and fill balance and erosion control on sloped rows drive a lot of the sequencing. Most of these parcels fall under Permit Sonoma rather than a city department.
Get a Quote ›Russian River Corridor
Guerneville · Forestville · Graton · Monte Rio · Camp Meeker · Rio Nido · Duncans Mills
River parcels are their own discipline. Much of the corridor sits in mapped FEMA flood zones with a high winter water table, so drainage design, fill elevations, and seasonal work windows get set before anything mobilizes. Lots tend to be small and heavily wooded, redwood root systems limit where you can cut, and narrow river roads cap the size of equipment that can reach the site. Septic and drainage work here is planned around the river stage, not around the calendar.
Get a Quote ›Sonoma Coast & Far West County
Jenner · Cazadero · Annapolis · Valley Ford · Bodega Bay · Occidental
The far west county is steep, remote, and worth planning carefully. Access is frequently a long private or former logging road, which determines equipment size and haul strategy before the scope is even set. Coastal soils are looser and wind and salt exposure change how disturbed slopes get stabilized, so erosion control specs run heavier than they would inland. Parcels inside the Coastal Zone may need a coastal development permit in addition to county review, and we schedule this region in blocks to keep mobilization efficient for property owners.
Get a Quote ›Sonoma Valley & The Springs
Sonoma · Boyes Hot Springs · El Verano · Eldridge · Glen Ellen · Kenwood
Sonoma Valley mixes tight residential lots in the Springs communities with large hillside and vineyard parcels climbing toward the Mayacamas. On the smaller lots, older utility infrastructure and limited street frontage make careful trenching and locate coordination the whole job. Higher parcels bring slope stability, access road work, and drainage that has to account for Sonoma Creek's watershed. Jurisdiction splits here between the City of Sonoma and unincorporated county, and we confirm which applies before scoping.
Get a Quote ›Petaluma, Rohnert Park & Sebastopol
Petaluma · Rohnert Park · Cotati · Penngrove · Sebastopol
South and central county sites are flatter, denser, and dominated by expansive clay. That soil moves with moisture, so moisture-conditioning and verified compaction do the heavy lifting on pad and foundation work here. Flat ground also means positive drainage has to be engineered rather than assumed, especially on subdivision and commercial pads. Toward Sebastopol, orchard and rural residential parcels bring land clearing, access improvements, and pond work back into the mix.
Get a Quote ›Excavation Work Across Sonoma County
What Sonoma County Clients Say
"Dallas and his crew were professional from start to finish. They showed up on time, communicated clearly throughout the project, and the finished grading was exactly what we needed. No surprises — just solid work."
"I had a complicated foundation excavation on a sloped lot and DW handled it perfectly. They coordinated the soils report, managed the utility locates, and kept us on schedule. Highly recommend for anyone in the region."
"Great experience with DW Excavation. They were the only contractor who actually walked the site before giving us a bid. The work was done right and the cleanup was thorough. Will use again without question."
Common Questions
Answers to the most frequent questions we hear from homeowners, builders, and developers working in Sonoma County.
Ask Us Directly ›Are you a licensed excavation contractor, and can I verify it? +
Yes. DW Excavation, LLC operates under a valid California contractor license (CA LIC #1060838). You can verify any contractor's license status directly through the CSLB at cslb.ca.gov for added peace of mind before hiring.
Do I need a grading permit for my project in Sonoma County? +
Often, yes. Sonoma County requires a grading permit for cuts or fills exceeding 50 cubic yards or greater than 3 feet in depth, or when work supports structural elements. County guidance outlines the thresholds and exemptions, and DW Excavation can help you navigate the submittal process to avoid delays.
Does my permit come from the county or from my city? +
It depends on where the parcel sits. Properties in unincorporated Sonoma County, which covers most of the Russian River corridor, the coast, and the rural valleys, go through Permit Sonoma. Properties inside the county's nine incorporated cities, including Santa Rosa, Petaluma, Healdsburg, Windsor, Sebastopol, Sonoma, Rohnert Park, Cotati, and Cloverdale, go through that city's own building department. We confirm jurisdiction during the site walk so the submittal path is clear before work is scheduled.
How do you handle trench safety on site? +
We follow OSHA trenching and excavation standards on every job, including safe access and egress, protective systems in deeper trenches, and daily inspections by a competent person. This reduces risk, protects our crew and your property, and ensures the work passes inspection without issue.
Will you manage erosion control and stormwater best practices? +
Yes. Silt fencing, slope protection, stabilized entrances, and seasonal stormwater measures are planned to meet Sonoma County BMP expectations and protect neighboring properties. We prepare and implement SWPPP documentation as required by the project scope and county standards.
Can you reach rural and small-community properties in west Sonoma County? +
Yes. We regularly work in Guerneville, Forestville, Graton, Monte Rio, Camp Meeker, Duncans Mills, Jenner, Cazadero, Annapolis, Valley Ford, and Occidental. Access is the first thing we assess on these sites, since road width, grade, and turning radius determine what equipment can reach the work. That assessment happens during the site walk so the scope and the machine list match reality before mobilization.
What factors most affect excavation cost and schedule in Sonoma County? +
Access constraints, soil type (Sonoma's heavy clay soils often require moisture-conditioning), rock presence, seasonal weather windows, and permitting and inspection cadence are the biggest drivers. On river and coastal parcels, flood zone status and the winter water table add another layer. Our preconstruction site review identifies each of these early so we can build realistic budgets and schedules before any equipment mobilizes.
Does DW Excavation handle projects outside of Santa Rosa? +
Absolutely. We serve all of Sonoma County from our Windsor base, covering the Santa Rosa metro, Healdsburg and Alexander Valley, the Russian River corridor, the Sonoma Coast and far west county, Sonoma Valley and the Springs, and Petaluma through Sebastopol. We also regularly work in Monterey County and across the California Central Coast.
Excavation Done Right in Sonoma County
Windsor-based and locally owned since 2013. Licensed, insured, and owner-operated. Let's talk about your project.
Serving All of Sonoma County
Sources & References
- CA Contractors State License Board (CSLB) — License Verification, cslb.ca.gov
- Sonoma County Permit Sonoma — Grading Permit Requirements (50 cu yd / 3' depth threshold)
- Sonoma Resource Conservation District — Rainwater Harvesting Rebate Program (up to $5,000)
- Sonoma County — Green Halo C&D Waste Tracking Program (2024)
- OSHA CFR 1926 Subpart P — Excavations and Trenching Safety Standards
- State Water Resources Control Board — SWPPP Requirements for Construction Activities
- California Coastal Commission — Coastal Development Permit Requirements
- FEMA Flood Insurance Rate Maps — Russian River Corridor, Sonoma County