Austin is split down the middle by I-35, and it is close to a literal soil boundary.
East of the highway is deep Blackland Prairie clay - the same highly expansive soil that gives
Dallas its problems. West of it, toward Lakeway, Bee Cave and Dripping Springs, houses sit on
thin caliche and soil over Edwards limestone.
The practical consequence: an east-side house in Del Valle or Manor has a different
problem from a west-side house in Westlake, and they need different repairs. Piers on the
west side often reach rock within a few feet. On the east side they may need to go far deeper
to find stable material below the active zone.
Austin's other distinctive issue is new construction on engineered fill. The area has been among the fastest-growing in the country for two decades, and a great deal of housing
in Round Rock, Pflugerville, Hutto, Kyle and Buda sits on graded and filled lots. Fill that was
not properly compacted settles, and it does so within the first five to ten years - which is
why this area sees foundation complaints on houses far newer than the Texas average.
That also makes the builder warranty question worth asking first. On a house under
ten years old, structural coverage may still apply, and a foundation company that tells you to
check before selling you piers is telling you something useful about how they operate.
What the Austin contractor base looks like
Austin splits along I-35, and so does its contractor base. 76% of the 17 companies naming a method offer steel and 41% offer pressed concrete - a wider overlap than elsewhere, because a contractor working both the clay east of the interstate and the limestone west of it needs more than one technique.
The 25 on this page
- Median Google rating
- 4.8
- Rated 4.8 or better
- 18
- Median reviews
- 39
- Over 500 reviews
- 3
- Median years in business
- 24
- Twenty years or more
- 12
- Towns represented
- 8
Every figure here is counted across the 25 companies listed above, not across the
wider market. The oldest on the list has been in business 90 years, and
together the 25 carry 3,074 Google reviews.
