Foundation movement is close to a statewide condition in Texas. Much of the state sits on expansive clay that swells when it rains and shrinks in drought, and slab foundations move with it. Doors that stick in https://www.soundhomebuying.com/cities/hitchcock August and close fine in March are telling you about soil moisture, not carpentry.
That ubiquity cuts both ways when you sell. Buyers here are less shocked by foundation work than buyers elsewhere, and a repaired foundation with paperwork is a normal thing to encounter. An unrepaired one with visible cracking and no documentation is a different matter, because the buyer has no way to price an unknown.
Start by finding out what you actually have. A structural engineer\'s report costs a few hundred dollars and gives you a measured elevation survey rather than an opinion. This matters because foundation companies assess for free and then quote the repair, which is a reasonable business model but not an independent assessment. An engineer's report also travels with the sale and answers the buyer's question directly.
Texas requires a written seller's disclosure covering known defects, and previous foundation repair is squarely within it. If work was done, say so and produce the documentation. Many foundation warranties in Texas are transferable to a new owner, sometimes for a fee, and a transferable warranty is one of the most useful documents you can hand a buyer. Find out whether yours transfers before you list.
On whether to repair before selling: the arithmetic is rarely as good as people hope. A full pier and beam underpinning job on a slab house runs into real money, the work takes weeks, and the sale price seldom rises by the full cost. What repair does buy you is access to financing and a wider buyer pool, which is a different benefit and sometimes the decisive one.
That financing point is the crux. Lenders and appraisers react badly to active structural movement. A house with significant unrepaired foundation damage may not qualify for conventional or government backed loans, which means the buyer pool is cash regardless of how you list it. No amount of staging changes an appraiser's condition rating.
So the honest comparison is not repaired-price versus as-is-price. It is repaired price, minus repair cost, minus months of carrying costs and uncertainty, against an as-is price you can close on quickly. For a homeowner who has the cash and the time, repair usually wins. For one who has neither, it does not, and pretending otherwise just burns months.
Get the engineer's report first. Everything else is guesswork until you have it.