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Sienna is Missouri City by address and Beaumont Clay by geology, and only the second one decides how a slab behaves. Coverage here is routine Fort Bend County work.
The jurisdiction line matters for the permit and for almost nothing else. What matters structurally is that Sienna is large enough to contain two different foundation stories at once: established sections old enough to have completed several full moisture cycles and to be showing the results, and recent construction where the questions are drainage, backfill compaction and how the lot was graded rather than long-term movement. An elevation survey reads the same on both — but what the numbers mean, and whether they call for anything, depends entirely on which Sienna the house sits in.
For Sienna homes showing settlement typical of the region's expansive clay.
Establishing proper grading and drainage for Sienna's newer sections before problems start.
Assessing cracks against the same regional clay-movement patterns seen elsewhere in Fort Bend County.
Driveway and patio leveling for sunken exterior slabs.