How to Tell Which Foundation You Have

Most DFW homeowners can figure it out in under a minute.

• Walk around the outside of the home. If you see a row of small screened vents near the ground or a crawlspace access door, it is pier and beam. If you see a continuous concrete pad with no vents, it is slab on grade.
• Listen as you walk inside. Pier and beam floors usually have a slight bounce or hollow sound. Slab floors feel firm and silent underfoot.
• Look at the year built. Homes built before 1965 in Dallas, Fort Worth, Oak Cliff, M-Streets, and original parts of Plano and McKinney are mostly pier and beam. Homes built from 1970 onward in Plano, Frisco, Allen, Garland, Mesquite, and the rest of the metro are almost all slab.

Still unsure? A free Stratum inspection confirms the foundation type and identifies any movement in under an hour. Call (214) 302-8559 or book online.

Pier and Beam Foundations: How They Work and How They Fail

A pier and beam foundation lifts the home off the ground using a grid of vertical supports — usually concrete pads or piers, with wooden beams running across them and floor joists running across the beams. Underneath, there is a crawlspace usually 18 to 36 inches tall.

Why pier and beam foundations fail in DFW

• Wood rot in beams and joists caused by crawlspace moisture
• Settled or undersized pads that no longer carry the load evenly
• Crawlspace water intrusion during heavy rain that destabilizes pads
• Termite damage to beams (very common in older Oak Cliff and East Dallas homes)
• Tree root pressure lifting one section while another settles

What pier and beam repair looks like

Repair work happens under the home from inside the crawlspace. A typical scope includes:

• Adjusting or replacing shims between the beam and pier to re-level the floor
• Installing new concrete or steel pads under sections that have settled
• Sistering or replacing rotted joists and beams
• Adding moisture barriers and vapor sealing to the crawlspace floor
• Adding drainage at the exterior perimeter if water is collecting under the home

A pier and beam repair on a typical DFW home runs about 1 to 2 days on site. Pricing scales with how many supports need adjustment or replacement and how much beam work is required. Older Dallas and Fort Worth pier and beam homes can also benefit from a deeper-pier solution underneath when wholesale settlement is happening. In those cases, our ST3 steel pressed pier system is the most common solution.

Slab Foundations: How They Work and How They Fail

A slab on grade is a single concrete pad poured directly on the prepared soil. Plumbing runs through and under the slab. The whole home — framing, walls, roof — sits on top of that pad. Slab is the dominant foundation type in DFW because it is faster, cheaper to build, and works well in stable clay when drainage is properly handled.

Why slab foundations fail in DFW

• Expansive clay soil that swells with rain and shrinks during drought, lifting and dropping the slab
• Poor drainage that lets water pool against the slab
• Plumbing leaks under the slab that wash out supporting soil
• Tree roots pulling moisture from one corner of the slab
• Original soil compaction issues from the home’s build, especially on lots filled in the 1970s and 1980s

The Texas Water Development Board has documented North Texas as having some of the most reactive clay soils in the country. That is why DFW has more foundation repair activity than nearly any other metro. (Texas Water Development Board – Expansive Soils)

What slab repair looks like

Slab repair lifts the foundation back to its original elevation using piers driven or drilled into stable soil below the clay zone. The crew excavates small pits at each pier point, presses or drills the pier, and uses a hydraulic ram to slowly raise the beam back to grade.

Three pier systems handle nearly every slab job in DFW:

• ST1 Concrete Pressed Piers — the most common slab solution. Stacked 12-inch concrete cylinders pressed to refusal (typically 12 to 22 feet deep in DFW).
• ST3 Steel Pressed Piers — used when piers need to go deeper, when soils are weaker, or when the home is heavier (two-story brick).
• ST10 Drilled Piers — engineered drilled shafts with rebar cages and poured concrete. Used on the largest, heaviest, and most complex homes where an engineer specifies them.

A slab repair on a typical single-story DFW home is completed in 1 day on site. Two-story homes and jobs with interior tunneling run 2 to 4 days.

Pier and Beam vs. Slab Repair: Side-by-Side

Signs of a Failing Pier and Beam Foundation

Catch these early and the repair is small.

• Sloped, sagging, or bouncy floors in one or more rooms
• Squeaking floors that have gotten worse over the last year
• Crawlspace doors that won’t latch or have started binding
• Visible water in the crawlspace after rain
• Insect damage on exposed beams (sawdust trails, mud tubes from termites)
• Gaps between baseboards and floors that were not there last year

Signs of a Failing Slab Foundation

These are the slab-specific warnings.

• Stair-step cracks in brick veneer wider than 1/8 inch
• Cracks across the slab top near the front entry
• Doors that stick at the top corner, not the latch side
• Windows that won’t lock because the frame has racked
• Diagonal drywall cracks from the corner of a door or window
• Standing water within 4 feet of the foundation after rain

A full set of warnings is covered on our causes of foundation problems page.

Which Foundation Costs More to Repair?

There is no universal answer, but in DFW the patterns are clear.

• Small pier and beam adjustments — adjusting shims, replacing a few pads — are typically the cheapest foundation repairs in the metro, often $1,800 to $4,500
• Slab repairs with 8 to 14 piers, exterior only — typically $3,500 to $7,800
• Slab repairs with interior tunneling — typically $6,800 to $13,500
• Major pier and beam rebuilds with new beams, joists, and underpinning piers — typically $8,000 to $18,000
• Engineered ST10 drilled-pier slab jobs — typically $9,500 to $15,000+

In other words, a small problem in either system is affordable. A major problem in either system is a real investment. The right pier system, the right scope, and a thorough plumbing test always matter more than which foundation type you started with.

Financing helps either way. Stratum’s Momnt program offers 0% interest with no payments for 6, 12, or 24 months with a soft credit check.

What About Pier and Beam Conversions?

A small number of homeowners ask whether they should convert their pier and beam home to a slab. The honest answer in DFW: almost never. Conversion is invasive, expensive, and removes the easiest-to-service foundation type. A well-maintained pier and beam home with adequate drainage and a sealed crawlspace can last another century. The better move is to repair what you have and add moisture control.

How Stratum Approaches Each Repair Type

Every Stratum job starts with the same three steps regardless of foundation type:

1. Free on-site inspection with a Zip Level survey, photographs, and a marked diagram of recommended supports
2. Written all-in quote with the pier system or beam plan specified, plumbing tests included where appropriate, and the lifetime transferable warranty attached
3. City permit and engineer letter handling if your situation requires them

We have completed more than 5,000 repairs and 20,000 inspections across DFW since 2006 from six offices in McKinney, Allen, Frisco, Plano, Dallas, and Garland. Find your city on our locations page.

Key Takeaways

• Pier and beam sits over a crawlspace; slab is poured directly on graded soil
• Most pre-1965 DFW homes are pier and beam; most post-1970 DFW homes are slab
• Pier and beam fails through wood rot, settled pads, and moisture
• Slab fails through expansive clay, drainage, and plumbing leaks
• Pier and beam repair happens inside the crawlspace; slab repair happens outside and underneath
• Small fixes on either type are affordable; major rebuilds approach the same price band
• The right scope and a real plumbing test matter more than the foundation type itself

Frequently Asked Questions

Which is better: pier and beam or slab foundation?

Neither is “better” universally. Pier and beam is easier to service, easier to retrofit plumbing under, and tolerates seasonal soil movement well when maintained. Slab is cheaper to build, more energy-efficient at the floor, and more common in modern DFW construction. Both work well in North Texas when designed and maintained correctly.

Can a slab foundation be converted to pier and beam?

Technically yes, but conversions are rare, invasive, and almost never cost-justified in DFW. Most homeowners with slab issues are better served by repairing the slab with a pier system than by converting the foundation type.

How can I tell if my DFW home is pier and beam or slab?

Walk around the exterior. Visible vents or a crawlspace access door means pier and beam. A continuous concrete pad with no vents means slab. Floors with a slight bounce or hollow sound are usually pier and beam; firm, silent floors are usually slab.

Is pier and beam more expensive to repair than slab?

Small pier and beam adjustments are typically the cheapest foundation repairs in DFW. Major pier and beam rebuilds (multiple beams, joists, and underpinning) can match or exceed slab repair pricing. Pier system, scope, and access drive the total more than foundation type.

Do all slab repairs require tunneling?

No. The majority of DFW slab jobs use exterior piers only. Tunneling is required when an interior beam has dropped or when an engineer specifies interior support points. Tunneling adds half a day to a full day per tunnel.

What pier system does Stratum recommend for slab foundations?

The most common slab solution in DFW is the ST1 concrete pressed pier. Heavier homes, deeper clay zones, or engineered designs use ST3 steel pressed piers or ST10 drilled piers. The inspector recommends the system based on home weight, soil depth to refusal, and engineering input where required.

Will I need to leave the house during repair?

No. Both pier and beam repair and slab repair allow you to stay in the home throughout the job. The noisiest work is the morning excavation; most homeowners work from home through it without trouble.

Are plumbing tests needed for pier and beam repair?

Sometimes. Pier and beam homes have exposed plumbing in the crawlspace, so leaks are visible and easier to identify. Pre-test and post-test plumbing checks are not always required but are recommended if there is any sign of long-standing moisture under the home.

How long is the warranty on each type of repair?

Stratum’s warranty is lifetime transferable on every pier we install, regardless of foundation type. The next owner of your home inherits coverage at no cost.

Does homeowner’s insurance cover either type?

Standard policies in Texas exclude foundation settlement from expansive soil for both foundation types. Coverage typically applies only when a sudden covered event (plumbing burst, fallen tree, vehicle impact) caused the movement. Always file the claim before paying for the repair if you suspect a covered cause.

Can the same crew handle both pier and beam and slab work?

Yes. Stratum crews are trained on both systems and we frequently work on homes that have a slab section plus a pier and beam addition (common on older Dallas and Fort Worth properties with a renovated kitchen or sunroom).

Which type holds resale value better?

Both hold value well when properly maintained and properly repaired. Buyers and lenders care less about the foundation type than they do about the documentation: a recent inspection, a pier diagram, a passed post-test, and a transferable warranty. See our realtors page for the pre-listing pier program many DFW agents use.

Call (214) 302-8559 to schedule.

Sources & Methodology

This guide draws on Stratum’s internal repair data (5,000+ DFW jobs since 2006), engineering best practice for North Texas expansive clay soils, and the following authoritative sources:

• Texas Water Development Board — soil moisture variation and expansive clay distribution in North Texas (twdb.texas.gov)
• City of Plano, City of Dallas, City of Fort Worth permitting offices — current foundation repair permit requirements
• Foundation Performance Association — pier installation and lift methodology guidelines

Repair pricing reflects 2026 DFW market rates as of the publish date and may change with material costs (steel pipe, concrete). All claims about Stratum service (warranty terms, financing, offices, technician credentials) are accurate to the publish date.

About Stratum Foundation Repair: Founded 2006, headquartered in McKinney, TX. 4.9-star Google rating across 519 reviews from six DFW offices. Owner: Ryan Hise. Lifetime transferable warranty on all pier installations.