How to tell if a Williamson County home has a real foundation problem or just cosmetic cracks.
Updated July 2026
Cosmetic cracks are typically thin (less than 1/8 inch), vertical, and do not change over time. Structural cracks are wider than 1/4 inch, diagonal (especially from door and window corners), horizontal (which can indicate bowing walls), or actively growing. When in doubt, a free foundation inspection can tell you for certain.
Foundation problems are stressful. You see a crack in the wall and your mind goes to the worst-case scenario. But here's the thing — not every crack means you need a $10,000 repair. Some cracks are completely normal. Others are a sign you should act fast.
Living in Williamson County means living on clay soil that swells and shrinks with every rain and every drought. That is the reality of building homes on Blackland Prairie. This guide will help you figure out what is normal, what is not, and what to do about it.
These are the signs you will notice inside your home. Pay attention to patterns — one small crack might be nothing, but several signs together tell a bigger story.
This is the classic sign. When a foundation shifts, the stress concentrates at the corners of openings. You will see cracks running diagonally — usually at about a 45-degree angle — from the upper corners of doors and windows toward the ceiling. A single thin crack might not be urgent. Multiple diagonal cracks appearing on the same wall, or on opposite sides of the house, strongly suggest foundation movement.
When a foundation moves, door frames go out of square. Interior doors start rubbing at the top or bottom. They may not close all the way. In Williamson County, some sticking is normal during humid months. But if a door that used to close fine now drags or gaps year-round — especially if it is getting worse — that is your foundation talking.
Just like doors, windows can go out of square when the foundation shifts. If you notice windows that used to slide easily are now jammed, or you can see gaps between the window frame and the wall, check for other signs of movement.
Put a marble or ball on the floor. Does it roll? Some slope is normal in any home. But if you can feel the slope when you walk, or if it has gotten worse over time, your foundation may have settled unevenly. In slab-on-grade homes — which is most of Williamson County — uneven floors often mean one section of the slab has dropped while another has not.
Look along the top of your walls where they meet the ceiling. Look at the baseboards. Are there gaps that were not there before? Gaps along the ceiling line or between the wall and floor boards indicate that the structure is separating — a sign the foundation underneath has shifted.
Walk around the outside of your home a couple times a year. These exterior signs are often easier to spot than interior ones.
This is the most visible exterior sign. Stair-step cracks follow the mortar joints in brick veneer, stepping up (or down) like stairs. They appear because the brick wall is rigid but the foundation underneath has moved. These cracks are extremely common in Williamson County, especially on homes built on heavy clay soil in Hutto, Taylor, and eastern Georgetown.
Look at the caulking around your exterior doors and windows. Are there gaps that have opened up? Can you see daylight around a door frame? These gaps form when the wall shifts relative to the opening. Besides indicating foundation problems, these gaps let in moisture and pests.
Look at the exposed foundation around your home's perimeter (the concrete strip visible between the ground and the siding). Vertical hairline cracks are common and usually not serious. Horizontal cracks are more concerning — they can indicate lateral pressure from the soil. Cracks wider than a quarter inch should be inspected by a professional.
Chimneys are heavy and sit on their own footing. If the foundation shifts, the chimney may lean away from the house or a gap may open between the chimney and the exterior wall. A leaning chimney is both a foundation issue and a safety concern. Get it looked at promptly.
If you notice the fascia board (the board along the roofline), trim, or molding pulling away from the house, it may indicate that part of the structure is settling while the rest is not. This is subtle and easy to miss, but it is a reliable early indicator.
In Williamson County's clay soil, water is the enemy. These drainage-related signs often appear before structural damage becomes visible.
After a rain, walk around your home. Is water sitting against the foundation? This is a big problem in clay soil. Standing water saturates the soil on one side of your home, causing it to expand while the other side stays dry. This uneven moisture creates differential settlement — the most common type of foundation damage in Williamson County.
During dry months — and Central Texas summers can be brutal — look for gaps between the soil and your foundation. When clay soil dries out, it shrinks and pulls away from the concrete. This gap tells you the soil is actively moving, and your foundation may be moving with it. This is when soaker hoses around the foundation perimeter help the most.
Your gutters and downspouts should carry water at least 4 to 6 feet away from your foundation. If downspouts dump water right next to the house, or if gutters are clogged and overflowing, you are concentrating moisture against your foundation. Fix this first — it is cheap and can prevent expensive foundation damage.
Hairline cracks (thinner than a credit card) in drywall. Small vertical cracks in the foundation. A single door that sticks slightly during humid months. Minor cracks in new homes during the first year (settling). Mark these with a pencil, date them, and check again in 3 to 6 months.
Diagonal cracks from door or window corners. Multiple sticking doors. Stair-step cracks in brick. Gaps opening between walls and ceiling. Floors that feel uneven. Visible soil separation from foundation. Any cracks that are growing. Most foundation companies offer free inspections — take advantage of this. Schedule 2 to 3 and compare what they say.
Cracks wider than 1/4 inch. Horizontal cracks in the foundation wall (these suggest lateral soil pressure). Chimney leaning. Doors that no longer close. Significant floor slope you can feel when walking. Multiple signs appearing at the same time. These indicate active, serious movement. Call a contractor and consider an independent structural engineer ($300–$500).
Take photos. Mark crack endpoints with a pencil and write the date. This creates a record of whether cracks are growing. If you sell the home later, this documentation is valuable.
Contact 2 to 3 foundation repair companies for free inspections. They will measure your foundation with a manometer or level and tell you exactly where and how much it has moved. Compare their findings and recommendations.
For major repairs (over $5,000), hire an independent structural engineer. They cost $300 to $500 in Williamson County. They work for you, not the repair company, and give an unbiased assessment of what your home actually needs. This can save you thousands by preventing unnecessary work.
Before or along with foundation repair, fix any drainage problems. Clean gutters, extend downspouts, and ensure the ground slopes away from your home. In Williamson County's clay soil, consistent moisture is your foundation's best friend.
Ready to understand pricing? See the foundation repair cost guide.
Not always. Small hairline cracks can result from normal house settling, temperature changes, or humidity. The cracks to watch for are diagonal cracks radiating from the corners of doors and windows, cracks wider than 1/4 inch, and cracks that grow over time. If you see these patterns, get a free foundation inspection.
Stair-step cracks that follow the mortar joints in brick veneer are one of the most common signs of foundation movement. They indicate that one section of your foundation has shifted relative to another. These are especially common in Williamson County homes due to clay soil expansion and contraction.
No. Foundation problems in Williamson County do not fix themselves. In fact, they tend to get worse over time, especially with the seasonal wet-dry cycles. The clay soil will continue to expand and contract, putting more stress on your foundation each year. Early repair is less expensive than waiting.
Some seasonal door sticking is normal due to humidity changes. However, if doors stick year-round, if the sticking gets worse over time, or if multiple doors in your home stick at once, these are signs of foundation movement rather than normal seasonal changes.
Cosmetic cracks are typically thin (less than 1/8 inch), vertical, and do not change over time. Structural cracks are wider than 1/4 inch, diagonal (especially from door and window corners), horizontal (which can indicate bowing walls), or actively growing. When in doubt, a free foundation inspection can tell you for certain.
First, don't panic. Take photos to document what you see. Monitor any cracks by marking their endpoints with a pencil and dating them. Then schedule free inspections with 2-3 foundation repair companies. For repairs expected to cost over $5,000, consider also hiring an independent structural engineer ($300-$500) for an unbiased assessment.
Some minor settling cracks in the first 1-2 years are common as the home adjusts to the soil. However, significant cracks, sticking doors, or visible foundation movement in a new home are not normal and may indicate poor site preparation or soil compaction issues. These should be addressed while the builder's warranty is still active.
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