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Home / Willis

Foundation repair in Willis, TX

Willis is the northern I-45 city in this set: smaller than Conroe, growing, and closer to the pine woods that stretch toward Sam Houston National Forest.

Willis sits on Interstate 45 north of Conroe. It is an incorporated city with a much smaller population than Conroe or The Woodlands, surrounded by unincorporated Montgomery County that has been adding houses along the same corridor. City Population’s table of Census Bureau figures lists Willis at 6,408 residents in the April 1, 2020 Census and 7,652 in the July 1, 2025 estimate. Use those numbers for the city limit, not for every home with a Willis mailing address.

Because so much of the growth around Willis is outside the municipal boundary, a foundation conversation here often includes rural or semi-rural lots as well as in-town streets: longer driveways, more remaining trees, drainage that follows ditches rather than curb-and-gutter, and, in some cases, on-site wastewater systems rather than municipal sewer. Those lot conditions change how water moves around a slab.

Local photo coming soon

A Willis-area photo from a public road showing pines, a roadside drainage ditch, or the mix of older in-town houses and newer corridor development. Do not trespass for a picture.

North-county lots often combine pine cover with open drainage, which is a different setting than a curb-and-gutter subdivision in southern Montgomery County.

Pines, sandy and loamy soils, and clay pockets

Texas Tough places about 95 percent of Montgomery County in the South Central Plains, the Piney Woods, and it treats large pines and hardwoods as a major local cause of slab movement. It specifically mentions the canopy that runs from Sam Houston National Forest to wooded subdivisions near Lake Conroe. Willis is the community on this site that sits closest to that national-forest edge.

The same guide says most of the county is loamy or sandy rather than heavy black clay, with high-swell Woodville clay in pockets (about 6 to 7 percent of the county in that telling) and only about 15 percent of land in high or very high shrink-swell classes. The GHBA article is more categorical about expansive clay throughout the county. For a Willis homeowner, the honest version is: your lot may be a low-swell loam, a sandy slope that can wash out, or a clay pocket, and the trees may matter as much as the clay. An inspector has to look at the actual yard.

Older in-town houses and newer corridor houses

Texas Tough’s county housing-age figures are useful here too. Most Montgomery County homes are post-2000 slabs, but pre-1980 houses are more common in older parts of Conroe and in smaller towns. Willis has both an older in-town core and newer construction along the interstate corridor. If the house predates the recent building wave, ask whether it is pier and beam and whether plumbing leaks could be part of the settlement. If it is new, ask about fill, grading, and whether drainage was finished after construction.

Countywide, Census QuickFacts report 13,614 building permits in 2025. That permit wave is one reason a “new house” in or near Willis can still show early settlement. Age alone does not rule a foundation healthy or unhealthy.

Requesting an inspection in Willis

Mention whether the home is in the city limit or in the surrounding unincorporated area, and describe ditches, slopes, and nearby pines. MoCo Foundation Repair does not claim a Willis office. Inspections and repairs are performed by [Partner contractor name TBD]. Request a free inspection. Phone: (XXX) XXX-XXXX Phone number coming soon. Calls may be recorded.

Sources cited on this page