If you have contacted multiple foundation repair companies about your home, you may have discovered that their recommendations can vary considerably.
One company may recommend installing several piers along one side of the foundation, while another proposes underpinning the entire perimeter. A third may recommend a different repair method altogether.
The differences can be substantial, both in the amount of work proposed and the overall cost.
For homeowners, this creates an understandable concern. If everyone is evaluating the same foundation, why are the recommendations so different?
Before founding Endura Structural, our owners spent years as licensed Professional Engineers evaluating residential foundations across Central Texas, including New Braunfels, San Antonio, and the Austin area, often reviewing repair proposals homeowners had already received. Through this work, we have frequently encountered situations where the engineering evidence did not support the extent of repairs being proposed.
In our experience, one of the primary reasons for conflicting recommendations is that foundation repair proposals are not always developed from a comprehensive engineering evaluation.
The Difference Between an Engineering Evaluation and a Repair Estimate
Foundation repair recommendations should begin with an understanding of how the foundation is performing.
However, not every company approaches this process in the same way.
Some repair companies rely primarily on visible distress and floor elevation measurements to identify areas they believe require support. Others use relatively standardized pier spacing or repair configurations based on their preferred installation methods.
While these methods can provide useful information, they do not necessarily establish whether repairs are needed or how extensive those repairs should be.
A comprehensive engineering evaluation considers the foundation’s construction, measured deformation, visible distress, drainage conditions, and potential causes of movement.
For example, a low elevation along one side of a home does not automatically establish that the entire side requires underpinning.
The elevation difference may reflect settlement, original construction conditions, previous movement, or a combination of factors.
At Endura, we believe the repair scope should follow the engineering findings rather than allowing a predetermined repair method to drive the diagnosis.
Engineering Criteria Help Establish Whether Repairs Are Necessary
Before determining how many piers a foundation needs, it is important to establish whether the foundation is performing satisfactorily.
The Guidelines for the Evaluation and Repair of Residential Foundations, published by the Texas Section of the American Society of Civil Engineers (ASCE), provide recognized methods for evaluating residential foundation performance.
A thorough engineering evaluation considers characteristics such as deflection, tilt, and cantilever movement.
For example, deflection may be evaluated against a guideline of L/360, while overall tilt is commonly evaluated against a guideline of 1%. Cantilever deformation is also evaluated using applicable engineering criteria.
These measurements help identify portions of a foundation exhibiting potentially unsatisfactory deformation.
However, exceeding a guideline does not automatically establish that underpinning is necessary, just as remaining within a guideline does not guarantee the absence of structural problems.
The evaluation must also consider observed distress, construction characteristics, and the available movement history.
Without this analysis, a repair proposal may be based more on where the floor is low than on whether the foundation actually requires additional support.
Why the Number of Piers Can Vary So Much
One of the most noticeable differences between foundation repair proposals is the number and location of piers (also called piles).
A homeowner might receive one proposal recommending eight piers and another recommending twenty. Although the larger proposal may appear more comprehensive, that does not necessarily mean it is the better solution.
Pier placement should be based on the foundation’s structural configuration, load paths, areas requiring stabilization, and the intended repair objectives.
For slab-on-grade foundations, the location and capacity of perimeter and interior grade beams can significantly influence where additional support is appropriate.
Pier spacing must also consider the ability of the foundation to transfer loads between supports.
Simply installing more piers does not guarantee better performance.
Likewise, installing too few piers or placing them in inappropriate locations can limit the effectiveness of the repair and potentially introduce additional stresses into the foundation.
An appropriate pier layout should have a defensible engineering basis rather than being determined solely by a standard spacing convention.
Partial Underpinning Can Be an Appropriate Solution
Another common disagreement involves whether repairs should be limited to the affected areas or extended around the entire foundation.
At Endura Structural, we believe partial underpinning can be a reasonable and effective solution when it is developed with a proper understanding of the foundation’s performance and the causes of movement.
For example, when settlement is concentrated along one portion of a foundation, it may be appropriate to stabilize that area without underpinning the entire structure.
However, this decision requires careful consideration.
The engineer must evaluate whether the proposed repairs will adequately address the problem, how the remaining foundation may respond to future soil movement, and whether differential movement could continue between supported and unsupported areas.
Partial underpinning should not simply be viewed as a less expensive alternative to full underpinning. It must be a technically justified solution with a reasonable expectation of achieving the intended stabilization.
Full underpinning may be appropriate when movement is widespread or when a more comprehensive stabilization strategy is warranted.
Neither approach is universally correct. The appropriate repair scope depends on the foundation’s condition, construction, movement mechanisms, and the owner’s objectives.
Stabilization and Leveling Are Not the Same Thing
Foundation repair proposals may also differ because contractors are proposing different outcomes.
One company may focus on stabilizing areas experiencing settlement, while another proposes lifting portions of the foundation to recover lost elevation.
Although lifting may be performed during underpinning, it should not automatically be considered the primary measure of a successful repair.
The primary purpose of stabilization is generally to provide additional support and reduce the potential for continued downward movement in the repaired areas.
Attempting to recover elevation must be approached carefully.
A home may have experienced movement over many years, and its framing, finishes, plumbing, and other components may have adjusted to the existing conditions.
Excessive lifting can introduce new stresses and cause additional damage.
For this reason, the appropriate amount of elevation recovery should be determined based on the structure’s existing condition and the risks associated with lifting, rather than simply attempting to make every floor measurement equal.
Installation Quality Is Just as Important as the Repair Design
Even when the proposed pier layout is appropriate, the effectiveness of the repair depends heavily on how the work is performed.
Different contractors may use steel push piers, concrete pressed piles, drilled piers, helical piles, or other underpinning systems.
Each system has advantages and limitations, and the installation procedures can significantly affect performance.
For steel push piers, installation should include appropriate procedures for advancing the pier sections, evaluating installation resistance, transferring loads, and documenting the completed work.
At Endura, our installation procedures emphasize measurable criteria and quality-control documentation. Every project ends with a closeout package that includes before-and-after floor elevation surveys, photos of the work at key stages, and a pile log recording each pile’s location, depth, and refusal force (or installation torque, for helical piles).
These records help establish what was actually installed rather than relying solely on the contractor’s assurance that the work was completed properly.
Two proposals specifying the same number of piers may therefore represent substantially different levels of engineering consideration and construction quality.
How Homeowners Should Compare Repair Proposals
When comparing foundation repair estimates, homeowners should look beyond the total price and number of piers.
The most important questions are whether the foundation actually requires repair, what conditions the proposed work is intended to address, and whether the repair layout is appropriate for the structure.
Homeowners should also understand the proposed installation method, quality-control procedures, anticipated elevation recovery, and warranty limitations.
It also pays to check what each proposal leaves out. For example, one bid might underpin the home with interior piles installed through holes cut in the slab but exclude plumbing. If the plumbing also needs repair, a plumber may later need to tunnel under the same slab, and you pay for that access twice.
A repair proposal should clearly explain its technical basis and expected outcome.
If two contractors recommend substantially different solutions, those differences should be supported by identifiable engineering or construction considerations rather than simply differing opinions about how many piers to install.
Choosing an Appropriate Foundation Repair Solution
Foundation repair is not simply a matter of installing a certain number of piers beneath a home.
It involves understanding the foundation’s existing performance, identifying the conditions that warrant correction, and developing a repair strategy suited to the structure.
At Endura Structural, our approach is shaped by our owners’ years of experience as engineers evaluating residential foundations, identifying movement mechanisms, and developing repair recommendations.
We have seen firsthand how repair recommendations developed without adequate engineering analysis can lead to unnecessary work or solutions that fail to adequately address the underlying problem.
Our objective is to provide foundation repair solutions that are technically justified, clearly explained, and installed using documented quality-control procedures.
The best foundation repair is not necessarily the one with the most piers or the lowest price. It is the one that appropriately addresses the problem and provides a reasonable expectation of long-term performance.
Get One Engineered Scope Before You Compare Bids
The simplest way to make repair proposals comparable is to have every contractor price the same engineered scope. An evaluation from Criterium-Williams Engineers is $795 for most homes and includes a sealed report with any recommended underpinning area and estimated pile count. If you already have a sealed report from a Texas-licensed engineer completed within the last 60 days, send it to us. Endura can prepare a proposal from it, and the evaluation discount applies if you hire us for the recommended work.
Schedule an engineering evaluation, read our answers to common foundation questions, or learn whether your foundation really needs repair.
