The definitive guide to local shopping; methodically researched, updated daily.

May 25, 2020
An earthworks contractor for a local excavation company stands on a job site where the company is providing dirt removal, trenching, backfilling, and other excavation work.

How To Find the Best Excavation & Grading Contractors in Sonoma County CA

Earthwork contractors in Sonoma County do excavation, grading, digs trenches (trenching), dirt removal, and earth moving in a way that a cut, fill, excavation, grade, trench, backfill, or tunnel can be executed, including the use of explosives for these purposes. Excavators in Sonoma County also provide topsoil and fill services, as well as landslide repair. Excavation is done on both residential and commercial sites to prepare them for construction, and can include removing, hauling, relocating dirt, gravel, and sand, or bringing them in. Excavation services are also done to prepare for foundations, basements, parking lots, driveways, roads, highways, and more.

The following research by The Prime Buyer's Report identifies the best earthwork contractors in Sonoma County and issues related to hiring them.


The TOP 10 Earthwork Contractors in Sonoma County CA

The TOP 10 Earthwork Contractors in Sonoma County CA

Siri Grading

  • Siri Grading Profile
  • Siri Grading Scorecard
  • Siri Grading Reviews
  • Siri Grading Photos
  • Siri Grading Brands
  • Siri Grading Articles
  • Siri Grading Offers
(707) 579-2141
PO Box 3638
Santa Rosa, CA 95402

Areas Served: Santa Rosa CA, Petaluma CA, Healdsburg CA, Rohnert Park CA,…
Services: local excavators, trenching, bobcat services

All Phase Excavating Service Inc

  • All Phase Excavating Service Inc Profile
  • All Phase Excavating Service Inc Scorecard
  • All Phase Excavating Service Inc Reviews
  • All Phase Excavating Service Inc Photos
  • All Phase Excavating Service Inc Brands
  • All Phase Excavating Service Inc Articles
  • All Phase Excavating Service Inc Offers
(707) 974-3266
1870 E Cotati Ave
Penngrove, CA 94951

Areas Served: Petaluma CA, Santa Rosa CA, Rohnert Park CA, Healdsburg CA,…
Services: residential & commercial earthwork contractors, dirt movers, site preparation

Tight Access Excavation Inc

  • Tight Access Excavation Inc Profile
  • Tight Access Excavation Inc Scorecard
  • Tight Access Excavation Inc Reviews
  • Tight Access Excavation Inc Photos
  • Tight Access Excavation Inc Brands
  • Tight Access Excavation Inc Articles
  • Tight Access Excavation Inc Offers
(707) 795-0369
6504 Orchard Station Rd
Sebastopol, CA 95472

Areas Served: Santa Rosa CA, Healdsburg CA, Petaluma CA, Sonoma CA, Windsor…
Services: earthwork contractors, excavators & earth movers for excavation, trenching

Timbercove Excavating Inc

  • Timbercove Excavating Inc Profile
  • Timbercove Excavating Inc Scorecard
  • Timbercove Excavating Inc Reviews
  • Timbercove Excavating Inc Photos
  • Timbercove Excavating Inc Brands
  • Timbercove Excavating Inc Articles
  • Timbercove Excavating Inc Offers
(707) 847-3721
22094 Ruoff Rd
Jenner, CA 95450

Areas Served: Healdsburg CA, Santa Rosa CA, Rohnert Park CA, Windsor CA,…
Services: earthwork & excavation incl trenching, dirt haulers, grading

Excavation Mann Inc

  • Excavation Mann Inc Profile
  • Excavation Mann Inc Scorecard
  • Excavation Mann Inc Reviews
  • Excavation Mann Inc Photos
  • Excavation Mann Inc Brands
  • Excavation Mann Inc Articles
  • Excavation Mann Inc Offers
(707) 847-3329
29876 King Ridge Rd
Cazadero, CA 95421

Areas Served: Santa Rosa CA, Windsor CA, Petaluma CA, Sonoma CA, Healdsburg…
Services: earthmovers, trenching, grading

How To Find the Best Excavation & Grading Contractors in Sonoma County CA

The state of California requires earthmovers and trenchers in Sonoma County to have a state license such as the C12 license for earthwork specifically.  The former specialty licenses of: D19 license for Land Clearing, D56 for Trenching only, and a D43 license for Soil Grouting (including slurry trench cut-off walls and soil stabilization) are all now under this C-12 license category for earthwork contractors, or a contractor can do these activities with the broader "A" contractor license. Earthwork companies, especially those doing earthmoving or land clearing, will sometimes call themselves bobcat services, backhoe services, or tractor services due to those machines being used.

But the state license for earthwork is no guarantee that any particular earthmover in Sonoma County CA is doing business ethically, delivering value, or satisfying customers.

This makes it all the more significant that all earthwork and excavation contractors in Sonoma County CA who bear The Prime Buyer's Report-TOP 10 symbol have been cleared by our research staff as passing all the requirements for Prime Buyer's Report-TOP 10 status such as survey phone calls to previous customers to verify high satisfaction, good complaint record, verified state license, proof of liability and workers comp insurance for your protection, only employees legal to work in the U.S., and more.



Excavation vs Trench

Excavation is often defined as any man-made cavity, trench, cut, or depression formed by earth removal. This includes excavations for anything from cellars to highways, dirt removal to landslide repair. 

A trench is formally defined as a narrow underground excavation that is deeper than it is wide, and no wider than 15 feet.

No matter how many shoring, trenching, and backfilling jobs an excavator or grading contractor in Sonoma County has done in the past, they must approach each new job with complete preparation and care, and the success of excavation work is dependent upon thorough planning.  When a trenching contractor waits until after the work has started to correct mistakes in shoring or sloping, it slows down the project, adds to the cost, and increases the chance of a cave-in or other excavation failure.

Before preparing a bid, excavation & earthwork contractors should be learning as much as possible about your property site and the materials needed to perform the work safely. Things they should be assessing on your job site prior to submitting a bid include utility lines both overhead and underground, weather, location of the water table, surface and ground water, soil conditions, traffic, and proximity of nearby structures.   A trenching contractor who prepares a bid without this full assessment is more likely to charge you for cost overruns or miss your deadline.

To make that assessment, the trench contractor should be doing a jobsite study, observations, test borings for soil type or soil condition, and consultations with local officials and utility companies. Failure to do so means the excavator is unlikely to correctly determine the right cost and equipment necessary to do your project safely and on time.

Some Earthwork Contractors in Sonoma County Are Much Better than Others
The Prime Buyer's Report lists these contractors for earthwork in Sonoma County CA: Tight Access Excavation Inc Sebastopol CA, Timbercove Excavating Inc Jenner CA, Excavation Mann Inc Cazadero CA, Siri Grading Santa Rosa CA, All Phase Excavating Service Inc Penngrove CA. Other earthwork contractors in Santa Rosa CA that might still be in business include: .

Questions to Ask Earthmovers in Sonoma County CA

When it comes to earth moving, excavation or trenching by C12 licensed earthwork contractors in Sonoma County CA, ask some questions about the abilities, experience, and credentials of the commercial trenching or residential excavators you're considering hiring.

• How long have the trench contractors been servicing Sonoma County?

• How many other earthmoving or excavation projects have they done specifically in Sonoma County, indicating how familiar or not they are with your local agencies, utilities, soil conditions, water table, and weather.

• Can the excavation companies give you names and numbers of previous customers who you can call as references? (All earth moving  contractors bearing the Prime Buyer's Report - TOP 10 symbol have already had their customer references called by research staff at The Prime Buyer's Report so you don't have to.)

• Do the earth moving companies have experience in the same kind of project as yours, such as residential versus commercial earth moving or grading?

• How does the earthwork and grading company determine pricing?

•  Can the graders and excavators vouch that all their employees sent to your property are legal to work in the U.S.? (All excavation companies bearing The Prime Buyer's Report - TOP 10 symbol have already signed an agreement to only hire documented workers.)

• Does the earth mover have active workers' compensation and liability insurance? (All earth moving companies bearing the Prime Buyer's Report - TOP 10 symbol have already shown proof of insurance to research staff at The Prime Buyer's Report.)

• In preparation for a written bid for your evaluation, what process will the excavator undertake to do a thorough assessment of the site, including soil conditions, local agencies, traffic, and more?

• Does the excavator provide written warranties for their labor beyond the 1 year warranty mandated by the state of California for C-12 licensed contractors?

• What happens if the excavator encounters toxic substances in the soil? Are they licensed and qualified to do remediation, or will you have to hire an outside company?

• How will the trenching company handle cost overruns due to inadequate planning? Do they guarantee to absorb any such costs or will they expect you to?

• Does the excavation company give any kind of guarantee of completion by your deadline date?

• How well do the excavators know their crews? Do they personally hire and train their crews, or do they bring them in from the outside on a project-by-project basis?

• How often and when do the excavators clean up your job site?

• If the excavation project is residential, will you have access to your home during the project?

When you've chosen the most suitable excavation company in Sonoma County make sure they are still licensed in good standing with a C12 contractor's license to perform your earth moving. (All excavation companies bearing the Prime Buyer's Report - TOP 10 symbol have already had their license verified by research staff at The Prime Buyer's Report.)

Resources About Excavation & Grading in Sonoma County CA

The following is a list of trade associations and publications relevant to earthwork contractors in Sonoma County CA.

Associations & Licensing for Earthwork & Excavators in Sonoma County CA

CSLB Contractors State License Board
DCA California Department of Consumer Affairs

ARTBA (American Road & Transportation Builders Association)

LICA (Land Improvement Contractors of America)

APWA (American Public Works Association)

CUIRE (Center for Underground Infrastructure Research and Education)

Common Ground Alliance

ISP (Infrastructure Security Partnership)

NASTT (North American Society for Trenchless Technologies)

UULLA (Underground utility and Leak Locators Association)

Publications for Sonoma County Excavation & Grading Contractors

Grading & Excavation Contractor Magazine

Better Roads Magazine

Compact Equipment Magazine

ENR California Magazine

Equipment World Magazine

RAI Magazine (Rebuilding Americas Infrastructure Magazine)

Site Prep Magazine

Tunnel Business Magazine

If you are looking for earthmoving, grading services or excavators The Prime Buyer's Report provides information for the TOP 10 Earthwork Contractors in Sonoma County within the following zip codes:

95403, 95421, 94953, 95407, 95439, 95408, 95476, 95492, 95452, 94923, 95431, 94999, 95472, 95406, 94972, 95409, 94922, 95433, 94954, 95450, 95402, 95480, 95448, 95487, 94952, 95430, 94951, 95436, 95471, 95405, 95446, 95497, 95425, 94927, 95465, 94931, 94975, 95404, 95444, 95486, 95412, 95419, 95462, 94928, 94955, 95401, 95442, 95473, 95441 and 95416

The Prime Buyer's Report provides information for the TOP 10 Earthwork Contractors in Sonoma County within the following cities:

Agua Caliente, Alexander Valley, Annapolis, Asti, Bloomfield, Bloomfield, Bodega, Bodega Bay, Cazadero, Cloverdale, Cotati, Fallon, Forestville, Fort Ross, Freestone, Fulton, Geyserville, Glen Ellen, Graton, Guerneville, Guernewood, Healdsburg, Jenner, Kenwood, Lakeville, Larkfield, Monte Rio, Occidental, Penngrove, Petaluma, Rohnert Park, Roseland, Russian River, Russian River Mdws, Salmon Creek, Santa Rosa, Schellville, Sebastopol, Sonoma, Stewarts Point Rancheria, The Geysers, Valley Ford, Windsor, Boyes Hot Springs, Camp Meeker, Duncans Mills, El Verano, Eldridge, Fetters Hot Springs, Rio Nido, Sheridan, The Sea Ranch, Villa Grande, Vineburg, Lytton, Mark West, Temelec and Two Rock