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Farmers Branch, Texas
Inside Farmers Branch's city limits, shrink-swell clay limits houses without basements on 45% of mapped land, higher than 53% of Texas cities. A shallow water table limits basements on 3%.
That clay share is below Dallas County's 51%. FEMA's flood data list 25 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 17,260 homes, 39% were built before 1980; the median dates from 2001.
Data as of October 13, 2026 · sources · in Dallas County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 2 overlapping ZIPs
of homes built before 1980
Foundation repair in Farmers Branch
Foundation repair in Farmers Branch: shrink-swell clay limits slab homes on 45% of Farmers Branch's mapped land, more than in 53% of Texas cities.
The city requires a permit for the work.
About 7,300 of Farmers Branch's 17,260 homes are detached houses.
| City permit | Required. Farmers Branch's residential code amendment says anyone who intends to repair a foundation must first get the required permit. (City of Farmers Branch, read October 2, 2026) |
| Engineer | Farmers Branch requires foundation repair construction documents to be prepared and sealed by a Texas-licensed professional engineer. (City of Farmers Branch) |
| Prices | Cost guide ranges compared |
Soil under Farmers Branch city limits
| Expansive clay (limits slab homes) | 44.9% |
| High water table (limits basements) | 3.2% |
| Septic fields very limited | 85.0% |
| Clay swell (LEP, by area) | 11.9% |
| High-swell land (LEP 6%+) | 45.2% |
| Urban land, not rated | 24.9% |
| Mapped soil | 7,715 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 25% | 91% |
| Trinity | 11% | n/a |
| Stephen | 5% | n/a |
| Wilson | 3% | 88% |
| Silawa | 2% | n/a |
| Lewisville | 2% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 11.9% by land area here, and 45% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 45% of the mapped land.
Clay shrinks as it dries: 100% of Dallas County is in drought on the latest map, and 45% of Farmers Branch's mapped land has shrink-swell clay.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in Dallas County
100% of Dallas County is in drought (D1 or worse) on the October 13, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Farmers Branch. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75234 | 76% | 16 | $809,234 |
| 75244 | 20% | 9 | $499,659 |
Homes in Farmers Branch
| Housing units | 17,260 |
| Median year built | 2001 |
| Built before 1980 | 39% |
| Built 2000 or later | 51% |
| Owner-occupied | 42% |
| Median value, owner-occupied | $364,600 |
| Single-family detached | 43% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Addison | 4 mi | 28% | under 1% |
| Carrollton | 4 mi | 65% | 8% |
| Coppell | 7 mi | 58% | 11% |
| Irving | 7 mi | 65% | 10% |
| University Park | 7 mi | 33% | 0% |
| Highland Park | 8 mi | 35% | under 1% |
| Hebron | 8 mi | 66% | 0% |
| Lewisville | 10 mi | 49% | 4% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status