How Much Does Underpinning a Foundation Cost? [2026 Data]

In 2026, the national average cost for foundation underpinning is $25,000. Most homeowners spend $10,000 to $30,000, with costs varying based on the number of piers needed, foundation type, and site accessibility. Projects can reach as high as $50,000 for extensive structural work.

Underpinning Foundation Cost Factors: What Determines the Price?

Underpinning a foundation costs anywhere from $1,000 to $50,000, with the final price driven by the number and type of piers your home needs, the accessibility of the damaged area, and the complexity of the work involved. Most homeowners spend between $10,000 and $30,000 when an average of around 10 piers is required. 

Costs vary significantly depending on these factors, and the breakdown below shows how each one affects your total:

Type of Underpinning

The type of underpinning your contractor recommends depends on your soil quality and how deep the bedrock sits beneath your home, with costs varying from $1,000 to $3,000.

Costs by pier type are shown in the table below:

Concrete Pier Underpinning

Concrete piers, known as poured concrete piers if the contractor pours them in place or stacked concrete piers if they stack precast concrete to create the pier,are the most affordable, typically totaling around $1,000 each. 

They're often used to distribute loads from small structures, like sheds and detached garages, to a shallow depth of five to ten feet beneath the surface. In some cases, they might be appropriate for standard homes.

Push Pier Underpinning

Push piers cost around $2,000 each, putting them in the middle in terms of price. Push piers, also called steel piers, are long supports made out of steel that distribute the load from your structure down to bedrock to avoid uneven settlement in the future from soil expansion and contraction. 

These piers are most popular in areas where the bedrock is at a shallow depth, usually fewer than 40 feet beneath the surface.

Helical Pier Underpinning

Helical piers are the most expensive, usually costing around $3,000 per pier. Helical piers look like large screws, and your contractor will screw them deep into the ground, usually up to around 20 feet, before attaching them to your home for support. The weight of your structure is distributed over a wider area thanks to the helices.

Helical piers aren't as supportive as steel piers because they don't reach down to bedrock and instead rely on the soil for support. However, they're more suitable in areas where the bedrock is prohibitively deep to use push piers.

Number of Piers

The number of piers your foundation requires is one of the biggest cost drivers, with a single-pier repair running $1,000 to $3,000 and a project involving 15 or more piers reaching $15,000 to $45,000. Most homes need around 10 piers, putting the typical all-in cost between $10,000 and $30,000.

Building Permits

Most municipalities require building permits for foundation repair, and your contractor will need to secure these before work can begin, at a cost of $200 to $1,000 depending on what your local building department charges.

Labor

Labor typically accounts for around 80% of your total foundation underpinning cost, putting this line item between $8,000 and $24,000 depending on the number of piers needed, soil conditions, foundation type, and site accessibility. A foundation repair contractor generally charges $100 to $200 per hour, while a structural engineer cost runs $200 to $800 per inspection.

Type of Foundation

The cost of underpinning depends heavily on which of the several foundation types your home has and how easily the damaged area can be reached. Pier and beam foundations are typically the most affordable to underpin because the crawl space is accessible and excavation is limited to individual pier locations. Concrete slab foundations, basements, and crawl spaces require more extensive excavation and are generally more expensive to underpin as a result.

Foundation Damage

Preventive underpinning to stop excess soil movement costs less than underpinning a foundation that has already sustained structural damage. When damage is present, your contractor may need additional jacks to support the structure during the work, and you may also need to budget for post-repair work once the underpinning is complete.

Accessibility

While foundation type plays the largest role in site accessibility, landscaping features and trees that obstruct heavy equipment can also increase labor costs, particularly when they force manual excavation in place of machinery. Clearing obstacles before work begins is one practical way to help keep labor costs in check.

Soil Type

The soil type around your foundation affects both excavation difficulty and the likelihood of structural instability in the first place. Sandy soil is lighter and easier to excavate, which keeps labor costs lower, while dense clay soil is harder to work with and also expands and contracts with moisture, increasing the risk of foundation movement and potentially requiring more piers for proper stabilization.

Additional Repairs and Services

Several additional repairs and services ranging from $500 to $20,000 are worth considering alongside foundation underpinning to restore structural stability and help prevent future problems:

• Foundation drainage: Many foundation problems that require underpinning stem from poor drainage, so installing a drainage system could help prevent ongoing stability issues. Expect to pay somewhere $2,000–$20,000 for this service, depending on what type of foundation drainage you choose.

• Gutter system: Installing a gutter system is a great way to keep excess runoff from creating the problems that necessitate underpinning in the first place. Gutter system installation costs $800–$8,000 in most cases.

• Sinkhole repair: Sinkhole repair costs $10,000–$20,000 in most cases, and, unfortunately, is rarely a permanent fix because the dissolving bedrock is often the problem. However, it could help prolong the frequency of stabilization.

• Soil gradation: Soil gradation can help avoid ongoing foundation sinking by using gravity to pull excess runoff away from your structure. Expect to pay $500–$1,000 for this service, but note that it generally won't solve major drainage problems.

Underpinning vs. Replacing Your Foundation

For most homes with structural damage, underpinning is far more affordable and less invasive than full foundation replacement, averaging around $25,000 compared to a replacement cost that typically falls between $50,000 and $100,000. Underpinning tops out at roughly $50,000, while foundation replacement can reach about triple that amount. If you are experiencing major structural damage, a structural engineer can help you determine the right path, though underpinning is the recommended solution in most cases.

Why You Should Hire a Foundation Repair Pro

Errors made while attempting to underpin a foundation with DIY techniques will likely put your home at risk of irreparable damage. Local foundation repair professionals possess the necessary equipment, expertise, and skills to ensure a safe and effective outcome.

Here's why it's ideal to hire a foundation repair pro

Professionals bring a lot of advantages to a complex job like underpinning a foundation, including:

• Professionals know which building permits you need in your region to underpin the foundation while following code requirements.

• Foundation experts will deploy specific techniques for underpinning based on the type of foundation you have.

• Pros have the heavy equipment needed to make the job go smoother, while DIYers would need to rent it—and learn how to use it.

• Underpinning a foundation can be risky work, but pros know which safety measures to deploy.

• Professionals will do the job as quickly as possible, reducing the amount of time your family's life is disrupted.

• Using licensed experts for underpinning ensures that it will last for many years.

• Some homeowners' insurance companies require you to hire a professional for underpinning the foundation instead of doing the job yourself.

• A professional may offer a warranty for the work, meaning you can trust that if you suffer any issues, the pro will fix them.

If you want to help with DIY before the pro underpins the foundation

Although you should never try to underpin a foundation yourself, you can take a few steps to help the professional complete the work faster, including:

• Improve exterior accessibility by removing trees or landscaping

• Move any furniture, boxes, and other items from the interior areas

• Cover furniture with dust cloths

• Secure heavy furniture

• Temporarily move breakable valuables outside the home

• Notify your insurance agent that you're having this work done

• Prepare to potentially be without utilities for a while

• Figure out how to keep kids and pets away from the work areas

Ways to Save Money on Foundation Underpinning Costs

While DIYing your structural repairs isn't an option, there are a few things you can do to cut the cost underpinning a foundation:

• Get Multiple Quotes: Shop around and browse available foundation repair contractors and structural engineers to find the best price that aligns with your needs.

• Be Prepared: While underpinning is a significant task to take on without a trained professional, you can do preparatory DIY work to limit the labor you need. Things like cleaning out or around your foundation to provide easier access can bring down your labor costs.

• Hire a structural engineer: It's a good idea to hire a structural engineer for an unbiased foundation inspection to determine what work you need done. The repair protocol they come up with can then guide repair contractors toward a sufficient and permanent solution rather than having to address ongoing issues from insufficient repairs down the road.

• Address the underlying issue: Structural damage always happens for a reason, so you should have your structural engineer determine the underlying problem and have your repair contractor address it. This will cost more upfront but could save you in the long run on future repairs.

• Avoid alternative living: You can often live in a home during foundation repair, so you can avoid having to pay for a temporary living space to save money. Just keep in mind that the noises can be distracting and unsettling, so it's not always a good idea.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.