Home Foundation Building: Key Questions to Always Ask the Contractor

What Foundation Repair Methods Do You Use?

Make sure your contractor targets the root cause of soil movement rather than cosmetic cracks, and ask for older client references to prove durability.

There are numerous repair methods available, so you will want to find out how the contractor evaluates your home and installs support piers. Always ask whether the proposed method addresses the root cause of the settling or merely covers up cosmetic cracks.

Verify that the contractor or construction company has extensive experience installing the specific pier system your home requires:

Steel piers: These can be driven deep into the ground (some reach 68 to 70 feet) until they hit load-bearing bedrock.
Helical piers: Steel shafts with spiral blades that work well for lighter structures or when there is no heavy concrete slab foundation.
Poured concrete pilings: Liquid concrete poured into holes drilled into the soil around your foundation when deep anchoring is required.
Belled concrete piers: Poured piers with a flared base designed to resist soil movement, though they are not appropriate for all soil types.

Does your contractor know how to make that judgment call? Ask for references from past clients, particularly from jobs completed 5 to 10 years ago, to see how the repair holds up over time.

Covered stone patio and concrete slab foundation of a rustic house at dusk

What’s Involved In Repairing The Foundation?

There is a major difference between installing an exterior pier and installing an interior one. Interior piers require breaking through your concrete slab foundation inside the living area, which means removing flooring, carpets, and furniture. That adds labor and expense to the job, but it is sometimes unavoidable when the interior of the slab is sinking.

You should also ask about practical site preparation and job site safety:

Confirm whether the contractor will contact local utility services to mark underground gas, water, and electrical lines before digging.
Ask how the crew will control surface water drainage, manage excavation backfill, and prevent water pooling around open trenches.
Clarify who handles interior dust protection and post-construction cleanup.

How Long Will It Take To Fix The Foundation?

No one likes surprises or open-ended timelines when heavy equipment is operating on their property. Most foundations take 2-3 days to repair, but if the property is heavily damaged, it might take a week or more to fix. Ask the contractor for a written schedule outlining daily milestones so you know what disruption to expect.

Do You Need To Do Any Soil Tests?

Before pouring piers or underpinning a slab, you may need a geotechnical engineer to examine the soil. Soil porosity, clay expansion, and mineral composition dramatically influence how the ground reacts around your home. Testing ensures your contractor designs proper countermeasures for settling, including adequate pier depths and water drainage management.

Without proper soil evaluation, you risk finding fresh cracks in your repaired foundation only a few months after the crew packs up.

Is A Structural Engineer Needed Before Repairs Are Made?

Hire an independent structural engineer to get an unbiased repair plan before you commit to any contractor sales pitch.

Hiring an independent structural engineer gives you an unbiased diagnosis without the pressure of a repair sales pitch. While many repair firms rely on an in-house evaluation, a licensed third-party engineer creates a neutral scope of work, checks building code requirements, and performs a final inspection to confirm the repairs are structurally sound.

Two-story red house with stone porch pillars along a gravel driveway at dusk — Source

Is A Building Permit Required Before You Start?

Never hire a contractor who tries to skip city building permits, as this avoids safety inspections and signals unlicensed work.

In most municipalities, structural foundation repairs require a formal building permit. If a contractor claims you can get away without a permit, treat that as a serious foundation contractor red flag. Skipping permits often indicates that the company is trying to bypass city inspections, lacks proper licensing, or wants to cut corners on safety standards.

How Much Will All Of This Cost?

In general, foundation repairs should cost you between $2,225 and $8,133 for typical jobs, with the national average around $5,175. Minor crack sealing or patching shouldn’t cost you more than $2,000, while major structural stabilization and extensive piering can run from $10,000 to $40,000 or more.

Ask for a comprehensive, itemized quote that clearly separates the cost of labor, materials, excavation, engineering reports, and permits.

Review the contract terms and warranty details before signing any agreement:

Payment schedules: Avoid paying large upfront deposits; structure payments around completed project milestones.
Change order procedures: Ensure all additional charges require your written authorization before the contractor performs extra work.
Foundation warranty questions: Clarify whether the warranty is transferable to future buyers if you sell your home, and check for specific exclusion clauses such as plumbing leaks or drought conditions.
Arbitration clauses: Check whether the agreement requires binding arbitration, which can restrict your legal options if a dispute arises.

Compare at least three detailed bids. If an estimate seems unusually high, ask the contractor to walk you through the numbers. On the other hand, beware of unrealistically low bids: contractors who severely underbid often plan to add surprise change orders or cut corners during construction.

Dennis Lewisham is an independent building foundation contractor and foreman. He has worked in the construction industry for two decades and enjoys sharing practical structural advice with homeowners and DIY builders.