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A Comprehensive Guide to Basement Excavation Cost

Basement Excavation Cost

Have you ever thought about the space under your house? Your growing family may require more storage, a recreational area, or even additional bedrooms and baths. Explore Basement Excavation Cost considerations today.

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If you wish, you can dig a brand new basement. Contractors can excavate your home and pour a new foundation.

This comprehensive guide will help you determine how much money you should budget for the project and what factors to consider when calculating basement excavation costs.

What is Basement Excavation?

Basement excavation is the removal of rocks, dirt and other debris in order to create space for a brand new basement. This is the first step in building construction, where you create a hole to build your new space.

After your house is built, you can excavate a basement. It is a more complicated process that requires excavation contractors with the skills to dig deep into the soil, remove the excavated debris and not damage the foundation. Excavation is usually more cost-effective before construction.

Basement Excavation Cost

Costs for excavation of basements in new construction range between $12,000 and $36,000. This is roughly $10 to 20 per square foot.

The average cost of digging underground beneath an existing house is between $40,000 to $50,000. This comes to about $47-$100 a square foot.

Comparing costs, digging a basement is slightly more expensive than expanding an existing crawl space. A 1,000-square-foot basement will cost between $22,500 to $45,000. Costs for crawl space extensions range from $10,000 to $30,000.

Although crawl space expansion might seem less expensive than digging out a new basement, it is important to factor in the costs associated with construction.

Factors that affect the cost of a basement excavation project

Several factors influence the total cost for a basement excavation. Understanding these factors can help you budget and plan effectively.

Size of Excavation

Large excavations that require local contractors and more equipment will increase the overall cost.

Cost: $75-150 per cubic yard removed of dirt

Raising or Bracing

To avoid structural damage, you need to support your home when excavating the basement. Although hydraulic jacks are faster and more affordable, they can compromise stability. Bracing or underpinning is more time-consuming but preserves structural integrity better than raising.

Cost: Raising (3,100 to 9,400 dollars); underpinning (20 000 dollars).

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The Plumbing

When planning your excavation costs, it is important to consider the cost of installing a proper drainage and plumbing system in your basement.

The cost of plumbing varies depending on what fixtures you choose and how they will affect the main sewer. Drainage systems should be designed in a way that keeps the basement dry. This is especially important in areas where there is a high level of water.

Cost: The plumbing expenses for a basement renovation range between $1,000 and $3,000. Drainage systems cost anywhere between $2,000 to $6,000 depending on the local climate, soil condition, and yard grading.


Building permits are required for all major construction projects, including excavation of basements. The cost of permits depends on the local building codes.

Budgeting between $1,200 and $2,000 is a good estimate.


After the excavation and plumbing are complete, a foundation of concrete must be laid. Pouring concrete for the foundation walls, floors and footings is part of this process.

Cost: Prices range from $10,000 to $30,000

Unexpected Repairs

The foundation of a basement may need to be repaired, which can reveal existing problems. Repairs that are not expected can include foundation work, drywall repair, and frame repairs.

The cost of foundation repair can range between $2,100 and $7,800, while other repairs may cost $50 to 80 per square foot.

Can You Dig a Basement Deeper?

It is possible to make a basement deeper if you lower the floor. Basement underpinning allows you to increase the height of your cellar without having to reduce its square footage. It is a great option for people who want to maintain the space they already have.

Bench-footing, on the other hand involves digging out the crawlspace to create a deep basement. However, it can result in a smaller finished basement.

How to turn a crawlspace into a basement

The following steps are involved in converting a crawlspace into a basement:

Scaffolding: Build a structure that will support the weight of your home as you build the new foundation.

Excavate Crawl Space. Excavate beneath the house in order to create a basement, which is usually eight feet deep.

Pour the New Foundation. For the basement, pour four to six feet concrete walls around the house. This will create a solid link between the old and new foundations.

Finish the Basement: Finish the basement and move the house onto the new foundation.

Monitor for Settleling: Keep a close eye on your foundation and basement over a period of 1-2 months to identify any issues.

The Right Residential Excavation Contractor

Basement excavation is a great way to increase the value of your home and expand it. When getting estimates from local contractors, make sure you consider the above factors.

Greenbar Excavation has the expertise to complete basement excavations successfully. Contact us to discuss the excavation requirements for your dream space.

Contact Greenbar Excavation Now!

Greenbar Excavation is a family-owned business located in Prineville, Oregon that specializes in excavation, grading, and site preparation services. We have been providing these services to customers for over 20 years and are proud of our reputation as one of the best excavation companies in the area. Our team consists of experienced professionals who understand how important it is to provide quality workmanship on every job we take on. 

Our Services

At Greenbar Excavation we strive for excellence when working with clients whether they need residential or commercial grade excavations. Our goal is always customer satisfaction no matter what type of job we do; from single home improvements all the way up to major industrial sites requiring extensive earthworks -we guarantee high quality results at competitive prices! With decades worth of combined industry knowledge under belt there’s nothing Greenbar Excavation can’t handle when it comes down getting ground ready for whatever purpose may require!

Don’t look any further, go with the company with your best interest in mind! We offer a multitude of services which are:

Call us today with any questions about our Excavation Cost and check out our 5-star reviews!

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