The short answer
Structural foundation work in Fort Worth — underpinning, pier installation, and similar load-bearing repairs — is generally permitted through City of Fort Worth Development Services. Non-structural work such as flatwork leveling, drainage improvement, and cosmetic repair frequently is not, though the boundary depends on the scope.
Because requirements change and because the answer depends on exactly what is being done, the useful step is not to memorise a rule. It is to have your specific scope confirmed against current municipal guidance, and to see that confirmation written into the proposal.
Why permits exist for this work
A permit does two things. It creates a record that the work happened, and it triggers inspection at defined points so someone other than the contractor has looked at it.
Both matter later. When a house is sold, permit history is part of what a buyer, an agent, or a lender may ask about. Unpermitted structural work is not automatically a disaster, but it is a question you have to answer, and answering it years afterwards is harder than getting the permit at the time.

Who is responsible
In practice the contractor usually applies for the permit, coordinates the inspections, and closes it out. That is the normal arrangement and it should appear in your written scope as a line item rather than being left implicit.
This is worth checking on every proposal you receive. A scope that says nothing about permitting is a scope where the responsibility is unallocated, and “the homeowner is responsible for obtaining any required permits” is a sentence that sometimes appears only in terms and conditions.
Ask directly
“Does this scope require a permit, who applies for it, who pays the fee, and is the fee included in this price?” Four short questions, and the answers should be in writing.
Jurisdiction is not the same as your mailing address
This catches people out regularly around Fort Worth.
Every city in the area runs its own permitting. Arlington’s process is not Fort Worth’s. Keller, North Richland Hills, Mansfield, Burleson, Benbrook, Saginaw, Haltom City, and the rest each have their own requirements, fees, and inspection arrangements.
Some cities also span county lines. Mansfield and Burleson straddle the Tarrant and Johnson county boundary. Grand Prairie spans Tarrant and Dallas. Azle spans Tarrant and Parker. Weatherford, Aledo, and Willow Park are in Parker County; Cleburne and Joshua are in Johnson County.
A mailing address is not a reliable guide to which authority reviews the work. The address is, and confirming it is a step that should happen before a proposal is written rather than after work has started.

What a permit does not tell you
Permit data gets misused in local content, so this is worth stating plainly.
A permit record shows that work was applied for and, where inspections were completed, that it was inspected. It does not show that a foundation had failed, that repair was necessary, or that the work was well executed. Permits are issued for proposed work, not for diagnosed defects.
That matters because permit counts occasionally get presented as evidence of foundation problems in an area — “X hundred foundation permits pulled in this ZIP code last year.” That number tells you how many applications were filed with one jurisdiction. It does not tell you how many homes had structural defects, how many repairs were warranted, or anything about the house you are standing in.
If anyone publishes local statistics derived from permit data, the honest version explains the jurisdiction covered, the period, how records were classified, how duplicates were handled, what is missing, and how current the data is. Without that, the number is decoration.
Where permitting fits in the project
Realistically, the sequence is: evaluation, then scope, then permit application where required, then scheduling, then work, then inspection, then closeout and documentation.
Permitting sits between agreeing the scope and starting work, and it has a lead time that varies by jurisdiction and workload. If your project is time-sensitive — a sale, a move, a deadline of any kind — that lead time is worth asking about early.
The documentation you end up with matters too. Permit records, installation records, and the written scope together make up the file you hand to whoever buys the house next. Our guide on assessment documents covers what each of those is good for, and the evaluation page explains what comes before any of it.