09/14/2026
How deep should foundation piers go in Oklahoma?
There is no correct number, and any contractor who gives you one before driving a single pier is describing a plan, not a measurement.
Here is what actually decides it: the soil that swells and shrinks with our seasons runs about 10 to 15 feet down. A pier has to get below that, into ground that holds steady year-round. Across most of Oklahoma that lands between 20 and 30 feet. Some lots hit bearing at 12. Others go past 40.
What sets the number, how it changes across the state, and what your paperwork should show:
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