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    Average homeowner rating
  • Verified reviews icon11
    Verified excavation services reviews

Find Excavation pros in Saint Helena

Avatar for Castaneda Grading & Excavating
Castaneda Grading & Excavating
5.0(
23
)
Building Site - Preparation and ClearingExcavation - Major Grading or ReslopingLandscape - Minor Grading or Resloping+2 more

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"Humberto is a very creative problem solver! Personable and definitely interested in customer satisfaction, so spends time understanding the full scope of the problem. The problem was the subterranean north wall of the sanctuary of First Presbyterian Church in Vallejo that was far from being waterproof, especially with the rains last winter. Castaneda dug out the soil next to the wall, pressure washed it and applied two coats of DryLok and then a layer of Henryâ s waterproofing. Then Humberto installed a French drain and then a big pipe to route the water off of five downspouts. To get the correct drainage slope, more excavating needed to be done than anticipated. Removed five landscaped trees and lots of concrete that was in the way of the drains which were to be routed under city sidewalks."
Garden
Graded
Finished driveway
Final slope grade
Finish grade 4 inches below sidewalk

+77

Response time1 day
Response rate96%
21 neighbors recently requested a quote
Avatar for SH Grading & Excavating
SH Grading & Excavating
5.0(
16
)
Building Site - Preparation and ClearingExcavation - Major Grading or ReslopingLandscape - Minor Grading or Resloping+2 more

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"I am incredibly pleased with this company. The entire crew were 100% professional. The owner of the company took time to answer my homeowner questions as they came up. He was very patient and thorough. All the men on the job worked incredibly hard and stayed on task throughout the project. They installed the French drain, installed a washout and removed an old deck all in a weekend. I would most certainly recommend them."
Grading
Grading
Grading
Grading
Dirt pile

+25

Response time7 hrs
Response rate100%
17 neighbors recently requested a quote
JOHN MOUNTAIN
5.0(
7
)
Building Site - Preparation and ClearingBuilding Site - Preparation and Clearing - For BusinessExcavation - Major Grading or Resloping

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2021

Free estimates

Offers commercial services

"I cannot say enough about how good this experience with John Mountain/Mountain Engineering has been. They said it would be 3 weeks; anti was. The work was painstakingly done, including a French drain behind the wall. And they replaced the plants that were destroyed during the process, which was an unexpected bonus."
Response time10 hrs
10 neighbors recently requested a quote
Recommended by57%of homeowners
Avatar for De Haro Landscaping
De Haro Landscaping
4.7(
12
)
Landscape - Minor Grading or Resloping

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Rafael did an excellent job repairing my fence. I will highly recommend him for any project based on how he completed this one so thoroughly. Thank you again for a job well done. It was a pleasure meeting you."
Front yard Landscape
Front yard Landscape
Front yard Landscape
Front yard Landscape
Front yard Landscape

+17

Response time2 days
2 neighbors recently requested a quote
Recommended by90%of homeowners
Juan Contreras Landscaping
5.0(
6
)
Landscape - Minor Grading or Resloping

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2019

Free estimates

Customers say: Quick response

"I hired Juan to redo my front yard. He removed the old lawn, updated the irrigation, and designed the new landscape. He did an amazing job and I am extremely happy with the finished project. He was on time and always communicated any changes. Juan and his team where friendly and professional throughout the entire project."
Response time3 hrs
4 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for E G Paving Construction, Inc.
E G Paving Construction, Inc.
5.0(
2
)
Excavation - Major Grading or ReslopingExcavation - Major Grading or Resloping - For Business

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"Edgar and his employees were amazing. Their bid was the best. Other guys said they would have to rip up pavement that this crew could do no problem minimally. The guys were so well groomed and polite. Not that that matters but it was an extra bonus. Lovely crew and incredible job in a few days. I will for sure use them again."
Driveways
Building pads
Concrete patio
Preparation
Asphalt pave

+4

Response time2 days
18 neighbors recently requested a quote
Recommended by50%of homeowners
Demar, Inc.
5.0(
1
)
Excavation - Major Grading or ReslopingBuilding Site - Preparation and ClearingLandscape - Minor Grading or Resloping+2 more

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2000

Free estimates

Offers commercial services

Demar Inc. proudly serves its customers with pride, integrity, and attention to the details that matter most to you. This is one of the many things, that set us apart from the rest. We are locally owned and operated. Give us a call today!

4 neighbors recently requested a quote
Recommended by100%of homeowners
JG LANDSCAPE CONSTRUCTION
5.0(
1
)
Landscape - Minor Grading or Resloping

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2025

Free estimates

"Julian and crew are fantastic and are perfectionists. They do the job right and more which is rare. I had them install a colored cement pad and a 12 x 14 gazebo on the pad. .All was done to perfection. Normally I am nervous when I have contract work done however this company made me so relaxed. They delivered better than high quality work as well as total communication. I am so happy to have found this company and will use them for future projects."
Response time1 day
3 neighbors recently requested a quote
Raya Engineering
New to Angi
Building Site - Preparation and ClearingBuilding Site - Preparation and Clearing - For BusinessExcavation - Major Grading or Resloping+2 more

Serving Saint Helena, CA and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

Here at Raya Engineering, we sustain our company on the principal that our customers come first. We offer services that are tailored to your needs and we're ready to show you what our experience can bring to your project! Call us today!

Showing 1-10 of 42
Excavating questions, answered by experts

Trenches are typically 12 to 24 inches deep and 8 inches wide. However, the required depth depends on the specific project and local ordinances. For example, a French drain may need to be 18 inches deep, while a water pipe might require a depth of 24 inches and a drainage pipe 36 inches. Your city or county may have specific regulations, so it's wise to consult with an excavation professional to determine the correct depth for your project.

Consultation with the local government helps identify necessary permits, avoid project delays or legal issues, and protect project integrity.

There are several different factors that influence how long it takes to excavate. For a foundation, it could take anywhere from three days to three weeks. It can take even longer if you face weather-related delays or an inaccessible site that’s riddled with boulders and rough terrain. It may also take longer if you have clay soil, which is more difficult to dig.

The best method for digging a trench depends on the scope of the project. For a short, shallow trench (less than 2 feet deep) in light, soft soil, digging by hand may be sufficient. However, digging by hand is labor-intensive, so consider the effort required. A machine trencher is the better option for longer trenches (over 100 feet), deeper ones, or when dealing with difficult soil conditions, such as rocky or hard ground, or obstructions like tree roots. A machine can save significant time and energy in these situations.

The best type of soil to build on is a mixture of sand and clay, known as loam soil. Loam soil has the best combination of these soil types to build a foundation on. The clay particles help with water retention, so it won’t erode like sandy soil might, and the sandy particles help with drainage, so you won’t see unsafe soil expansion or have an increased risk of leaks from water sitting against your foundation.

The Saint Helena, CA homeowners’ guide to excavation services

From average costs to expert advice, get all the answers you need to get your job done.