Katy terrace · Cinco Ranch, Texas
Foundation Repair in Cinco Ranch, TX
Less swelling clay than almost anywhere around Sugar Land, on ground that stays wet for months and is sinking faster than most.
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Cinco Ranch sits on different ground from most of Fort Bend County. None of the 24 spots we sampled on land there came up very high for shrink and swell, the USDA's top class. Only 4 came up high. If you'd heard that everything around Houston is clay, that may come as a surprise.
Less clay doesn't mean a Cinco Ranch house can't move, though. The soils here hold water for long stretches, and this corner of the county is where the subsidence district measures some of its fastest sinking. If you're looking into foundation repair in Cinco Ranch, here's what those records mean for your house.
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The Ground Under Cinco Ranch
Cinco Ranch sits on the Katy prairie terrace. On the state geologic map, every one of our spots that landed on land fell on the Lissie Formation, older ground that the USGS says dips beneath the coastal prairie to the south. In the soil survey, the 24 land spots split like this:
- None very high.
- 4 high. Cyfair covers 3 of them, at a peak of 6.0 that starts about 53 inches down. Edna (6.6) covers 1.
- 20 moderate or low. Katy fine sandy loam covers 11. It's sandy on top, over clay loam reading 3.8 from about 29 inches down. Clodine covers 8, peaking at 2.3 or 3.4 depending on the map unit, and one more Cyfair spot reads 4.0.
A reading of 3.8 is moderate, the class at which the USDA says swelling and shrinking can start to damage buildings. So "sandy" here means less movement, not none. The bigger local factor is water. The USDA says Clodine soil is saturated for 3 to 6 months during winter and spring. A slab that sits in wet ground half the year and dry ground the other half can still shift.
That puts drainage first on a Cinco Ranch checklist. Look for downspouts that empty at the wall, beds that hold water against the slab, and any plumbing leak. The ASCE Texas guidelines set a floor for that: 6 inches of fall across the first 10 feet of yard. Our soil guide shows how to find your own lot's soil.
Flood Zones in Cinco Ranch
FEMA's flood map is light on Cinco Ranch. Of the 21 spots we could count on land, just 1 fell inside the 1% annual chance floodplain. The other 20 landed in the area of minimal flood hazard. FEMA still says no place is risk-free, and heavy rain can back up local drainage outside any mapped floodplain.
Drainage here is organized at a larger scale. Cinco MUD No. 5 says every Cinco MUD lies within the Willow Fork Drainage District, formed to cover about 5,718 acres and to finance the area's major outfall drainage. It's a drainage district, not a levee district. For your own address, start with our flood zones guide.
Cinco Ranch Homes by Decade
The Census counts 6,227 homes in Cinco Ranch, and the median one was built in 1997. More than half went up in a single decade:
- Before 1960: 1.6%
- 1960s: 0.4%
- 1970s: 1.8%
- 1980s: 7.6%
- 1990s: 56.4%
- 2000s: 29.1%
- 2010s: 1.7%
- 2020 or later: 1.3%
No other town among the 22 we studied built as large a share of its homes in the 1990s. Those houses are now roughly 27 to 36 years old. Many slabs from that era are post-tensioned, with steel cables tensioned inside the concrete, so the cables need locating before anyone cuts or drills. A foundation inspection records where your floors stand today, which gives you a baseline to compare against later.
- 1997Median year Cinco Ranch homes were built
- 1.6%Built before 1960
- 88.5%Built in 1990 or later
Source: US Census Bureau, American Community Survey 5-year estimates, 2023.
Permits and Rules in Cinco Ranch
Cinco Ranch isn't a city, and a Katy mailing address doesn't put a house inside the City of Katy. Of our 25 spots, 19 fell in Fort Bend County and 6 in Harris County, so the county is the authority.
- Fort Bend side. The county has adopted no building code for single-family homes. It requires a Development Permit for building modifications and any work within the 100-year floodplain, at $100, or $150 in a floodplain. Whether a slab repair counts, the county doesn't say.
- Harris side. Harris County says a permit is needed for all development, meaning any man-made change to property.
Ask the right county before any work begins: Fort Bend County Engineering at 281-633-7500, or Harris County's permit office. With no city inspector on the job, keep the company's floor readings and a written scope of the work. The permits guide has more detail.
Watering Rules in Cinco Ranch
Cinco Ranch is served by a group of utility districts, and they don't share one drought plan. Two examples:
- Cinco MUD No. 7 and No. 12 start a voluntary "mild" stage every June 1 through September 30, so a summer notice is routine, not an alarm. In their moderate stage, a hand-held hose, bucket or watering can is allowed at any time. In the severe and critical stages, hand watering and drip are limited to set days and hours. In an emergency, watering is banned.
- Cinco MUD No. 5 sets watering by even and odd calendar dates, allows only a hand-held hose with a shut-off nozzle in its second stage, and bans outdoor water use in its third.
None of these plans mentions foundations. Your water bill names the district whose plan you follow. For how much water a slab needs, see the watering guide.
Foundation Repair Services in Cinco Ranch
- Slab foundation repair For 1990s and 2000s slabs on Katy and Clodine soils
- Pier and beam repair For raised floors over a crawl space
- House leveling When floors slope from one side to the other
- Foundation inspection For a baseline set of readings
- Foundation crack repair To tell a finish crack from a structural one
Cinco Ranch Questions
Is the ground under Cinco Ranch sinking?
The region is. The Fort Bend Subsidence District measures its fastest sinking, more than 2 centimeters a year, around Katy, Fulshear and Cinco Ranch. Groundwater levels near Cinco Ranch fell over 200 feet from 1990 to 2026.
The district's reports tie subsidence to flooding, drainage and fault movement. None we read says that slow, even sinking cracks a single house. Our subsidence guide explains the details.
Is there a subsidence monitor near Cinco Ranch?
Yes. Fort Bend County's only borehole extensometer, near Cinco Ranch since 2017, had measured 0.038 feet of compaction by the end of 2023, according to the USGS. It measures compaction at that borehole, which isn't the same thing as GPS sinking.
My Cinco Ranch slab is on sandy soil. Why is it cracking?
Sandy on top isn't sand all the way down. Katy soil turns to clay loam about 29 inches down, and Clodine stays wet for months. Water around the slab is the first thing to check.
Nearby Towns on the Same Ground
We serve Cinco Ranch and the towns around it, including Katy, Mission Bend, Fulshear, Pecan Grove and Richmond.
Katy shares Cinco Ranch's terrace soils and its light flood map. Mission Bend, to the south-east, is back on the prairie's Lake Charles clay. See all service areas.
Get a Free Foundation Inspection in Cinco Ranch
Tell us what you've noticed in your Cinco Ranch home. A foundation repair company that serves the area will take a set of floor readings and explain them clearly. There's no cost, and no pressure to go further.
Tell us what you're seeing