Slab Foundation and Concrete Repair in Texas: Local Rules

Why Texas slabs move: clay, not frost

Texas foundation problems start in the soil. Large parts of the big metros sit on expansive clay, which swells when it gets wet and shrinks when it dries. The Foundation Performance Association, a Houston engineering group, says foundation movement damage to homes in southeast Texas is "most often due to changes in moisture content of expansive soils"^[2].

We measured how much of each metro county sits on that kind of soil. Using USDA NRCS soil survey data, we computed the share of rated soil area with linear extensibility of 6% or more, the NRCS line for high or very high shrink-swell^[1]:

County (main city)	High or very high shrink-swell	Median year homes built
Dallas (Dallas)	70%	1983
Tarrant (Fort Worth)	60%	1990
Bexar (San Antonio)	47%	1990
Travis (Austin)	45%	1999
Harris (Houston)	42%	1988

The soil figures are our calculation, not an NRCS published number, and urban-land map units with no soil rating are left out^[1]. The housing ages come from Census data^[4]. Texas metro housing is young compared with Ohio or Illinois, so slab trouble here is a soil story more than an age story. See the full method on our county data page.

Frost is not the driver in these metros. Drought and heavy rain are. Most foundations are designed for up to about 1 inch of soil movement, and slabs in highly expansive areas may be designed for up to about 4 inches^[3]. Read more in expansive clay soil.

What repair cannot fix: heave

One point surprises many Texas homeowners. The FPA notes that common repair piers in the Houston area are not tied to the grade beams, so they cannot stop uplift when clay swells. Heave after repair is "not generally considered to be a failure of the piers"^[2]. The FPA also treats watering, drainage and root barriers as maintenance, not repair^[2]. Ask any contractor how their warranty treats heave. Our pier types guide explains the options.

City permit and engineer rules

Texas does not license foundation repair contractors at the state level. The Texas Residential Construction Commission was abolished effective September 1, 2010^[9]. A 2011 bill to regulate foundation repair contractors passed the Senate but stalled in the House and did not become law^[10]. Dallas tells residents that only plumbing, mechanical and electrical work need state-licensed trades, and that "a license is not required for general building work on your own property"^[8]. So city rules carry the weight.

City	What the city requires
Houston	A foundation repair permit covers slab fracture repair and stabilizing a moved structure. Slab-on-grade jobs need plans by a Texas-licensed engineer showing pier location, quantity and type. Pre-construction and final inspections apply, plus a $33.56 admin fee on top of the fee schedule[5].
San Antonio	The permit must be pulled by the owner or a City-licensed, active Residential Building Contractor. Repairs are designed by or done under a Texas-licensed engineer, who files an Assumption of Engineer of Record letter and clears inspections with an Engineer's Inspection Letter. Starting before the permit means a double fee[6].
Austin	Foundation repair that does not add more than 128 sq ft of impervious cover can use an Express Permit. A registered general contractor must be linked to the permit; a homeowner can register as their own. A plumbing permit may also be needed[7].
Dallas	Foundation repair permits can be issued at Building Inspection district offices. Owners may do general building work on their own property once permitted[8].

Other Texas cities set their own rules. Call the building department before you sign.

Selling a home with a repaired slab

Texas Property Code Section 5.008 requires sellers of previously occupied single-family homes to give a Seller's Disclosure Notice. TREC publishes the form for contracts on or after September 1, 2023^[11]. The form asks about foundation problems and past repairs, so keep the engineer's report, permit, final letter and warranty papers.

Insurance: the optional foundation endorsement

The Texas Department of Insurance says most policies cover a sudden, accidental release of water but not a continuous leak. TDI lists "damage to foundations or slabs" among optional endorsements that most companies offer^[12]. Endorsement limits vary by insurer. One TDI-approved Foundation Coverage endorsement pays up to 15% of the Coverage A dwelling amount for damage from seepage or leakage from plumbing, heating, air conditioning or sprinkler systems^[13]. Another approved endorsement pays up to $15,000, including repeated seepage over weeks, months or years, with tear-out costs inside that limit^[14]. Neither covers ordinary soil movement. Check your declarations page for the exact form.

Door-to-door sales: your 3-day right

If you sign a contract over $25 at your home, Texas law gives you until midnight of the third business day to cancel. The contract must state that right in bold type near your signature^[15].

When to call a pro

• Doors and windows start sticking and new cracks appear together. Book a Texas-licensed structural engineer for an elevation survey before you call a repair company.
• You suspect a plumbing leak under the slab. A licensed plumber can run a leak test, and a leak may matter for insurance.
• A contractor proposes piers without an engineer's plan in Houston or San Antonio, where the city requires one.
• You are buying a home with past foundation work. Ask for the permit, the engineer's letter and the warranty transfer terms.