Sand or clay? Keller is on the line
Two sources draw Keller’s ground slightly differently, and together they explain why foundation problems here vary so much from street to street.
The Handbook of Texas places the town in the Eastern Cross Timbers, with open prairie directly to the west. The USDA’s 1924 soil survey drew the eastern edge of the Grand Prairie through a point 2 miles east of Keller, which would put much of the town on the prairie side. Either way, Keller sits on the boundary, where sandy timberland and clay prairie interfinger.
That boundary has features of its own:
- Wilson clay. The 1924 survey says the chief areas of Wilson clay, a stiff, plastic clay, lie near Keller, right along the prairie and Cross Timbers boundary.
- Cross Timbers outliers. The same survey describes mounds of East Cross Timbers material standing 50 to 100 feet or more above the Grand Prairie, with notable examples near Keller.
Sandy Cross Timbers soils weathered from the Woodbine drain well and move less. Clay swells and shrinks. A Keller house built where the two meet can have one end on each, which is a recipe for uneven movement.
A town of detached houses
Keller’s housing is unusually uniform. Census figures show 88% of its 16,892 housing units are single-family detached houses, the median home was built in 1999, 48% date from 2000 or later, and only 10% from before 1980.
Houses of that era are mostly slabs, the usual Texas foundation according to ASCE’s Texas Section. Around a detached house, several things change the soil under the slab:
| What’s around the house | What it does to the clay | What to look at |
|---|---|---|
| A large tree near one side | Draws moisture out in summer, so that side can settle | Cracks and binding doors on the tree side |
| Beds watered more than the rest of the yard | Keeps one edge wetter than the others | Whether the movement lines up with the beds |
| A pool, patio or addition | Can trap water or change drainage paths | Where water stands after rain |
| Sloped or terraced lots | Mixes cut ground and fill under one slab | Settlement on the downhill side |
The drainage page covers gutters, grading and trees in more detail.
Call to schedule an inspection
What Keller’s rules say
Keller’s building inspections FAQ is the clearest public statement of its rules:
- Permits: required to construct, enlarge, alter or repair a building or structure. The FAQ states that as a general rule rather than naming foundation repair.
- Fees: based on construction value and square footage, not a flat foundation repair fee.
- Foundation documents: for new construction or additions and alterations, the FAQ lists engineered foundation plans with engineer's letters among the submittals. It doesn’t say whether a foundation repair counts as an alteration.
So expect a permit, expect the fee to depend on the job’s value, and ask Keller’s Building Services whether it wants engineer’s documents with a repair. The permit guide sets Keller beside Fort Worth, Mansfield and Arlington.
What repairs cost
No cost guide publishes a Keller figure. HomeAdvisor puts piers at $1,000–$3,000 per pier, and the bill depends on how many piers the plan needs and how deep they go. Angi notes that soil type alone changes what steel piers cost, and Keller has both sandy and clay ground, so a neighbor’s price across town isn’t a guide to yours. The cost page explains why two quotes for the same Keller house can differ.
Call to schedule an inspection
Three things to check first
- Walk the house after a heavy rain and note where water stands near the slab.
- Check whether cracks and sticking doors cluster on one side, especially near a big tree or a sloped part of the lot.
- Find the year the house was built and any paperwork from earlier repairs.
Then call to schedule an inspection; elevation readings show whether the movement follows the soil, the water, or both.