Katy terrace · Katy, Texas
Foundation Repair in Katy, TX
The least swelling clay we found, a city that lets you soaker-hose a foundation in a drought, and ground that's sinking fast.
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- Town-by-town soil data
- You never pay us
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Katy is the exception to most of what you'll read about foundations around Houston. Of our 25 Katy sample spots, none landed on soil the USDA rates very high for shrink and swell, and 21 came up moderate or low. Only Cinco Ranch came close among the 22 towns we studied.
The catch is underneath. The subsidence districts measure some of their fastest regional sinking around Katy and Fulshear. And Katy's sandy soil turns to clay loam a couple of feet down. If you're weighing foundation repair in Katy, here's how those facts fit together, and what the city's own rules say.
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The Ground Under Katy
Every one of our 25 Katy spots fell on the Lissie Formation on the state geologic map. That's the Katy prairie terrace, older ground that the USGS says dips beneath the coastal prairie to the south. In the soil survey, the 25 spots split like this:
- None very high.
- 4 high. All 4 are Edna, which reads 2.1 near the surface and 6.6 from about 9 inches to about 38 inches down.
- 21 moderate or low. Katy fine sandy loam covers 20 of them. It reads 0.4 in its top 6 inches and 0.9 to about 19 inches, then turns to clay loam that's about 30% clay and reads 3.8 from about 29 inches down. One spot is Cyfair, at 4.0.
So a Katy slab most often rests on sandy loam, with a moderate clay layer below it. The USDA says moderate soils can still damage buildings as they shrink and swell, so "sandy" doesn't mean "can't move." It does mean that when a Katy crack keeps growing, water deserves a hard look: a plumbing leak, a downspout emptying at the wall, or a yard that slopes toward the house.
NOAA's Katy City station averages 49.10 inches of rain a year. February is driest, at 2.67 inches, and July, at 3.42, gets less than June or August. The USDA's Web Soil Survey, free online, shows which soil is under your own lot. Our soil guide explains the terrace's soils.
Flood Zones in Katy
FEMA's map is lighter in Katy than almost anywhere we checked. Of our 25 spots, 1 fell inside the 1% annual chance floodplain and 1 in FEMA's moderate zone, between the 1% and 0.2% floods. The other 23 landed in the area of minimal flood hazard.
That's not the same as no risk, and FEMA says plainly there's no such thing. Inside city limits, Katy's floodplain development permit form says no work of any kind may start in a special flood hazard area until a permit is issued. For your own address, see our flood zones guide.
Katy Homes by Decade
The Census counts 8,129 homes in Katy, and the median one was built in 2003:
- Before 1960: 5.3%
- 1960s: 4.2%
- 1970s: 11.7%
- 1980s: 9.7%
- 1990s: 15.0%
- 2000s: 13.7%
- 2010s: 30.8%
- 2020 or later: 9.6%
Katy has an older core than its median suggests: about 1 in 5 homes predates 1980, and 5.3% predate 1960. The town has also kept building fast, with 4 in 10 homes from 2010 on. A pre-1960 Katy house is the likeliest to sit on piers and beams over a crawl space. A home from the 2010s is far more likely to be on a slab, often post-tensioned, with cables inside the concrete that have to be found before anyone cuts into it.
Census records give the year, not the foundation type. A foundation inspection settles which one is under your Katy house.
- 2003Median year Katy homes were built
- 5.3%Built before 1960
- 69.1%Built in 1990 or later
Source: US Census Bureau, American Community Survey 5-year estimates, 2023.
Permits and Rules in Katy
First, check the address. A Katy mailing address doesn't mean a house is inside the City of Katy; Cinco Ranch and Mission Bend, for example, aren't. The city itself crosses three counties: of our 25 spots, 13 fell in Waller County, 8 in Fort Bend and 4 in Harris. Inside city limits, here's what the city says:
- A permit is needed for most work. The city requires a building permit for most construction, and its application has a "Repair" box.
- Fees double without one. The form says so in a box at the top.
- Contractors register. Registration runs 12 months and costs $200 in all, with a certificate showing general liability of minimum $300,000.
- The 2021 codes. Katy builds to the 2021 International Residential Code and the 2021 Existing Building Code.
The contractor packet mentions engineer letters for foundation inspections, but labels that line for commercial projects only. For a house, the city's pages don't say. Ask the Building Department at 281-391-4830 before work starts. Our permits guide compares nearby towns.
Watering Rules in Katy
If the City of Katy sends your water bill, its 2024 drought ordinance is one of the friendliest to foundations we've read. In Stages 2, 3 and 4, it lets you water a foundation for up to two hours on any day, with a handheld hose or a soaker hose, whatever the lawn schedule says. Stage 1 is voluntary.
The city is clear that these rules cover City of Katy customers only. Homes in utility districts outside city limits follow their own district's plan. For how much water a slab needs, see the watering guide.
Foundation Repair Services in Katy
- Slab foundation repair For slabs on Katy fine sandy loam and Edna
- Pier and beam repair For Katy's older raised houses
- House leveling When floors slope across the house
- Foundation inspection To measure before you decide
- Foundation crack repair To tell a finish crack from a structural one
Katy Questions
Is the ground under Katy sinking?
Yes, faster than most of the region. The Harris-Galveston Subsidence District says GPS station P029, located in Katy within Fort Bend County, has recorded about 35 centimeters (about 14 inches) of subsidence since 2007. From 2021 to 2025 it averaged 2.64 centimeters, about an inch, a year. That's a regional measurement, not a reading of any one house. Our subsidence guide explains what it does and doesn't mean for a slab.
Does Katy allow soaker hoses on foundations during water restrictions?
If you're a City of Katy water customer, yes: up to two hours on any day in Stages 2 through 4, by handheld or soaker hose. District customers should check their own plan.
Does Katy's sandy soil protect my foundation?
It helps, but it doesn't make a slab immune. Katy soil turns to clay loam about 29 inches down, and the USDA rates that layer moderate, the class at which shrinking and swelling can start to damage buildings.
Nearby Towns on the Same Ground
We serve Katy and the towns around it, including Cinco Ranch, Fulshear, Mission Bend and Pecan Grove.
Cinco Ranch shares Katy's terrace soils, with no very high spot either. Fulshear, to the south, has the same sandy terrace in its north and Brazos River clay in its south. See all service areas.
Get a Free Foundation Inspection in Katy
Let us know what you've spotted in your Katy home. A foundation repair company that works in Katy will take floor readings and walk you through them. The visit is free, and whether to go further is entirely up to you.
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