Foundation Repair Contractors: How to Choose and Vet One

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The best way to choose among foundation repair contractors is to get an independent structural engineer’s assessment before you invite any contractor in for a free estimate. Engineers do not sell piers, anchors or wall braces, so their report tells you what is actually wrong and what scope of repair is reasonable; contractors then bid on that defined scope instead of designing their own. From there, compare written quotes that name the repair method, quantity, permit and warranty, and walk away from anyone who pressures you to sign the same day. This guide walks Front Range homeowners and buyers through that process: confirming the problem, matching repair methods to specific symptoms, reading a quote line by line, vetting licensing and insurance, typical cost ranges and what drives them, and how a home inspection fits in. It is general guidance as of 2026; your engineer’s report and your local building department take priority for any specific house.

Part of our Structure & Exterior guide — start there for the full picture →

Quick Reference: Symptoms, What They Usually Mean, Who to Call

Foundation symptoms overlap, and the same crack can mean very different things in different houses. Use this table as a starting point for the conversation with an engineer, not as a diagnosis.

For a fuller checklist of warning signs, see our guide to signs of foundation problems.

Step One: Confirm the Problem With an Independent Engineer

Most foundation repair companies offer free inspections. That sounds helpful, but the person doing the free inspection is often a salesperson or project estimator paid in part on what gets sold. Their recommendation may be correct, but it is not independent. A licensed professional engineer (PE) who does residential structural evaluations is paid for the opinion itself, and the report carries their professional license.

A typical engineer’s visit includes:

• A walk-through of the interior and exterior, looking at crack patterns, wall plumb, door and window alignment and drainage
• A floor elevation survey with a digital level or manometer to map high and low areas
• Review of the soils report or original plans if they are available (many Front Range subdivisions built since the 1970s had soils reports at the time of construction)
• A written report that states the likely cause, whether the movement appears active, and what repair or monitoring is recommended

Some engineers also design the repair, specifying the number and location of piers or the type of wall bracing. That design becomes the scope every contractor bids on, which makes quotes directly comparable. Engineer evaluations generally cost a few hundred dollars to around a thousand for a single-family house, depending on the scope and whether a repair design is included. Our guide to foundation repair cost puts that fee in context against typical repair spending.

Before you pay anyone, document what you see. Photograph cracks with a tape measure in the frame, date the photos and mark crack ends with a pencil line. If a crack grows past your mark over a few months, that is useful evidence the engineer can use. Our guide to foundation cracks explains how width, direction and offset change what a crack means.

Front Range Soils: Why Heave Matters as Much as Settlement

Much of the national foundation repair industry is built around settlement, where soil under a footing compresses or washes out and part of the house sinks. Settlement happens on the Front Range too. But a large share of local foundation trouble comes from the opposite direction: expansive clay soils that swell when wet and shrink when dry.

The U.S. Geological Survey’s national Swelling Clays Map of the Conterminous United States maps where clay-rich, swelling soils occur, and the Colorado Front Range sits in one of the areas where those soils are a recognized concern. The clay here is often derived from bentonite-bearing shale formations, and bentonite can absorb large amounts of water. When that clay gets wet, from a leaking gutter, poor grading, an over-watered flower bed or a broken sprinkler line, it can push upward on footings and basement slabs with considerable force. When it dries out in a hot, dry summer, it shrinks and can leave voids.

This matters for contractor selection in several ways:

• Heave and settlement need different fixes. Driving piers under a section of house that is being pushed up does not address the cause, and can make differential movement worse. An engineer can tell the two apart from the floor survey and crack patterns.
• Moisture control is often the first repair. Many Front Range engineers recommend correcting grading, extending downspouts and moving irrigation away from the foundation before, or instead of, structural work.
• Basement floor slabs move independently. Many local homes have “floating” basement slabs and framed partition walls built with a gap at the bottom to allow for slab heave. A contractor who wants to “fix” that gap may not understand the design.
• Local experience counts. A company that mostly works in sandy or settlement-prone markets may default to pier packages that are not right for clay heave.

Our guide to foundation settlement covers how sinking differs from heave and what each looks like inside the house.

Repair Methods Matched to the Problem

A good contractor recommends the method that fits the engineer’s findings, not the one their crew happens to install most often. These are the main options you will see on quotes.

Push piers (resistance piers)

Steel pipe sections are hydraulically driven down beside or under the footing, using the weight of the house as resistance, until they reach a load-bearing stratum or refusal. A bracket transfers the footing load to the pier, and the house can sometimes be lifted back toward its original level. Push piers suit heavier structures with settlement where competent soil or bedrock lies at a reachable depth.

Helical piers

Helical piers are screwed into the ground with a hydraulic torque motor. Steel plates (helices) on the shaft bear on the soil, and installation torque is used to estimate capacity. They work for lighter loads, porches, additions and new construction, and they can be installed where push piers lack enough structure weight to drive against. On expansive clay, the engineer may specify a minimum depth below the active zone of soil movement. Our helical piers guide explains how they are sized and installed.

Wall anchors, steel braces and carbon-fiber straps

Bowing or horizontally cracked basement walls are usually a lateral-pressure problem rather than a settlement problem. Options include:

• Wall anchors: plates on the inside of the wall connected by rods to anchors buried in the yard. They can be tightened over time to stabilize or gradually straighten a wall, but they need yard space and clear routing for the rods.
• Steel beam braces: vertical beams fastened to the floor and the floor framing above. They stop further movement and suit tight lots, but they protrude into the basement.
• Carbon-fiber straps: epoxied to the wall surface, low-profile and suited to walls with modest deflection that are not still moving significantly.

Walls that have moved beyond what bracing can address may need partial excavation and rebuilding. Our guide to foundation wall repair compares these approaches in more detail.

Crack injection

Epoxy injection bonds a crack structurally; polyurethane injection expands to seal a leaking crack and tolerates minor movement. Injection is a reasonable fix for stable cracks and leaks, but it does not address the movement that caused a crack. If a contractor proposes only injection for a crack the engineer describes as active, ask why.

Slabjacking and foam lifting

Sunken concrete flatwork, such as walks, patios, garage slabs and stoops, can often be raised by pumping a cement-based grout (mudjacking) or expanding polyurethane foam beneath it. It is far cheaper than replacement when the concrete itself is sound. Our mudjacking guide covers grout versus foam, and when lifting is not worth it.

Drainage and moisture corrections

Regrading soil to slope away from the house, extending downspouts, adding or repairing perimeter drains and moving sprinkler heads back from the foundation are frequently the most cost-effective repairs on expansive soil. Some foundation contractors do this work; others refer it to landscapers or waterproofing companies. An engineer’s report that leads with drainage is not a sign of a lazy engineer.

What a Good Written Quote Includes

Get at least two or three written quotes against the same scope. A quote that cannot be compared line by line with the others is a quote that is hard to hold anyone to. Look for:

• The engineer’s report or design referenced by date, or, if the contractor’s in-house engineer designed the repair, a stamped drawing showing it.
• The method and quantity: number of piers, their locations on a sketch, the pier type and the target depth or installation torque criteria.
• What happens if conditions differ: the cost per additional foot of pier depth or per extra pier, so a deep bedrock surprise does not become an open-ended bill.
• Permit responsibility. Structural foundation work generally requires a building permit in Front Range municipalities and counties. The quote should say who pulls it and that the price includes inspections.
• Lift expectations. Whether the contractor will attempt to lift the structure, how much recovery is realistic, and what interior damage (drywall cracks, sticking doors) is possible during lifting.
• Site work and restoration: excavation, landscaping and concrete removal and replacement, utility locates, and who repairs sprinkler lines cut during digging.
• Warranty terms in writing: what is covered (pier performance, wall movement, leaks), for how long, whether it is transferable to a future buyer and whether a transfer fee or re-inspection applies.
• A post-repair elevation survey or engineer’s letter confirming the work was completed per the design. Buyers and their lenders often ask for this later.

Warranty transferability deserves extra attention. A “lifetime” warranty that dies when you sell the house, or that requires the new owner to pay a fee within a short window, is worth much less at resale than one that transfers automatically.

How to Vet Foundation Repair Contractors

Licensing rules vary across Colorado. There is no single statewide license for general contractors, and many cities and counties along the Front Range run their own contractor licensing or registration programs. Check with the building department where the house is located. Then work through these checks:

1. License or registration with the local jurisdiction, if required, and a record of pulling permits for foundation work there.
2. Insurance certificates for general liability and workers’ compensation, sent directly from the insurer or agent, naming you as certificate holder.
3. Years in the local market and references from jobs at least a few years old, so you can ask whether the repair held.
4. Who does the work. Ask whether installers are employees or subcontractors, and who supervises on site.
5. Manufacturer certification for the pier or anchor system they install, where the manufacturer offers one.
6. Financial stability. A transferable lifetime warranty is only as good as the company behind it. Ask how long the company has operated under its current name.
7. Complaint history with the Better Business Bureau and online reviews, read for patterns rather than single angry posts.

Red flags

• Pressure to sign today, “today-only” discounts or claims the house is about to fail without an engineer’s backing
• A whole-house pier package recommended without a floor survey or an explanation of why every wall needs support
• Unwillingness to work from an independent engineer’s design, or dismissing the engineer’s findings
• No permit, or a suggestion that skipping the permit saves money
• Large cash deposits up front; reasonable deposits are usually tied to materials and scheduling
• A warranty described verbally but not provided in writing before you sign
• Piers proposed for a house the engineer says is heaving, with no discussion of drainage

Typical Cost Ranges and What Drives Them

Foundation repair costs vary enormously, so treat any number as a typical national range rather than a quote. Minor crack sealing or injection usually runs in the hundreds of dollars per crack. Slab lifting for a walk or stoop often lands in the hundreds to low thousands. Wall bracing or carbon-fiber straps for a single basement wall commonly runs several thousand dollars. Piering projects are frequently priced per pier, and a typical residential job can range from several thousand dollars for a corner to tens of thousands for a large section or whole-house underpinning.

The main cost drivers are:

• Number of piers or wall sections and the depth required to reach competent bearing
• Access: interior versus exterior installation, finished basements, decks, patios and landscaping in the way
• Soil conditions: deep expansive clay or bedrock at variable depth can increase pier length
• Engineering, permits and post-repair surveys
• Drainage work bundled into the scope
• Interior restoration after lifting, such as drywall and trim repairs, which many contractors exclude

Our guide to foundation repair cost breaks down how these variables add up for different repair types.

Prevention: Keeping Repairs From Coming Back

Even a well-designed repair can be undermined by water. On expansive clay, the goal is to keep soil moisture around the foundation as steady as possible:

• Keep grade sloping away from the house for several feet; settled backfill near the walls is a common culprit in Front Range homes.
• Discharge downspouts well away from the foundation.
• Keep sprinkler heads and heavily watered beds away from the walls, and fix leaking irrigation lines quickly.
• Check that window wells and perimeter drains are clear.
• Watch for new cracks and recheck your pencil marks a couple of times a year.

Cracks are also a pathway for soil gas. The EPA notes that radon “typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation.” Radon is common in Colorado, so if foundation work opens or seals cracks, retesting afterward is sensible.

How a Home Inspection Flags Foundation Issues

A home inspection is often where foundation concerns first come to light for buyers. The ASHI Standard of Practice directs the inspector to “inspect structural components, including the foundation and framing” and to describe the foundation, floor, wall, ceiling and roof structure. The same standard states that the inspector is not required to “provide engineering or architectural services or analysis” or to offer an opinion about the adequacy of structural systems.

In practice, that means an inspector reports visible conditions, such as cracks, bowing, sloping floors, moisture staining, poor grading and evidence of past repairs, and recommends evaluation by a structural engineer when something looks significant. It also means a buyer should ask the seller for any engineer’s reports, repair invoices, permits and warranty transfer documents for previous work. A pier repair with a transferable warranty and a final engineer’s letter is very different from an undocumented patch.

Model building codes such as the International Residential Code, adopted with local amendments by Front Range jurisdictions, govern foundation construction and repairs that require permits. The building department can tell you whether past work on a house was permitted and inspected.

When to Call a Pro, and Who to Call First

Call a structural engineer first if you see horizontal cracks, walls bowing inward, stair-step cracks, cracks wider than a pencil lead that are growing, sloping floors or doors and windows that have suddenly started sticking. Call a contractor once you have a defined scope. For simple sunken flatwork or a dry hairline crack that leaks, going straight to a slab-lifting or crack-injection contractor is usually reasonable.

If you are buying a home and want the foundation looked at alongside everything else, or you need help deciding whether the symptoms you see warrant an engineer, contact our team to schedule a Front Range inspection.

References

• Swelling Clays Map of the Conterminous United States — U.S. Geological Survey
• ASHI Standard of Practice for Home Inspection — American Society of Home Inspectors
• How Does Radon Get Into Your Home? — U.S. Environmental Protection Agency
• International Residential Code — International Code Council