Foundation Repair in Bonham, TX — Where the Soil Was Named for a Reason
Serving Bonham & Fannin County
The Bonham Marl Is Literally Named After This Town
Bonham is one of the few cities in Texas where the geological formation under the houses carries the same name as the town. The Bonham Marl is a Late Cretaceous clay layer, roughly 400 feet thick, that runs through Fannin County and into Lamar and Red River Counties. Geologists named it after exposures found just north of town. It is a gray, silty, high-plasticity clay that swells when it absorbs moisture and shrinks hard when it dries out. That is exactly the kind of soil that breaks foundations.
Our McKinney headquarters is about 45 minutes south on TX-121. We run crews into Bonham and across Fannin County regularly. If your doors are sticking, your brick has stair-step cracks, or your floors feel like they slope toward one side of the house, your slab is probably moving. The Bonham Marl does that. It has been doing it to homes here since long before Bois d’Arc Lake changed the water table in the area.
We offer a free inspection with no obligation. Our crew takes elevation readings across your entire slab, checks your grading and drainage, and evaluates the soil conditions around your home. Everything goes in a written report. If you do not need piers, we will tell you straight. We have done over 20,000 inspections across DFW and Fannin County and turned down plenty of jobs that did not need repair. When your home does need work, we use one of our three engineered pier systems and finish most jobs in a single day.
Fannin County sits on the eastern edge of the Texas Blackland Prairie, where the soil transitions from Austin Chalk into the Bonham Marl and other Upper Cretaceous clay formations. The Bonham Marl is a gray, silty clay that geologists literally named after this town because the type exposures were found just north of the city. It is one of the thickest clay deposits in the region at roughly 400 feet. That clay is the root cause of most foundation damage in the area.
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Bonham Marl — The Namesake Clay
The Bonham Marl is a high-plasticity clay that swells significantly when saturated and contracts just as hard during dry spells. That constant push-and-pull cycle stresses slabs from below. Homes throughout Bonham proper, from the historic neighborhoods near the square to newer builds south of town, sit directly on top of this formation.
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Bois d’Arc Lake and the Rising Water Table
Bois d’Arc Lake, the first major reservoir built in Texas in nearly 30 years, began impounding water in 2021 just northeast of Bonham. A 16,641-acre lake changes the hydrology of the surrounding area. Homes near the lake’s footprint and along the tributaries feeding into it may see shifts in subsurface moisture levels. More consistent soil moisture sounds good in theory, but rapid changes in either direction are what break slabs.
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Older Housing Stock
Bonham has a lot of homes built in the 1950s through 1970s, especially in the neighborhoods around Sam Rayburn Drive, North Center Street, and east of Highway 78. Those slabs were poured with less reinforcement than modern code requires. After 50-plus years of the Bonham Marl expanding and contracting under them, many are showing settlement. The Fannin County Courthouse district and the blocks surrounding the town square have some of the oldest foundations in the city.
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North Texas Drought Cycles
Fannin County gets roughly 45 inches of rain per year, more than Dallas or Collin County, but it comes in bursts. The 2022 summer drought baked the clay to the point of deep cracking, then heavy fall rains rehydrated it fast. That whiplash effect is the single worst thing for a slab on expansive clay. We saw a jump in inspection requests from Bonham and the surrounding communities that year.
Between the Bonham Marl, the changing hydrology from the new lake, and the age of many homes in town, Fannin County is tough on foundations. Drainage makes a big difference. If your gutters dump water right at the slab, or your yard slopes toward the house, that accelerates damage. We check all of that during every free inspection.
Signs Your Bonham Home May Need Foundation Repair
Some of these develop slowly over decades. Others show up after a single bad drought-to-rain cycle. If you notice two or more, get a professional evaluation.
→Cracks running diagonally from door or window corners through the drywall
→Interior doors that drag, stick, or refuse to latch when they used to work fine
→Stair-step cracking in exterior brick, following the mortar lines
→Floors that slope or feel uneven when you walk from one room to the next
→Gaps forming between walls and ceilings, or between window frames and the surrounding wall
→An unexplained increase in your water bill, which can indicate a slab leak from foundation movement
A single hairline crack is not always a problem. New concrete cracks as it cures, and that is normal. What matters is whether your slab is actually moving. We determine that with elevation data taken across the full footprint of your home. If it is just cosmetic, we will let you know.
Foundation Repair Systems We Install in Bonham
Recent Bonham Project
North Center Street, Built 1968
A homeowner on the north side of Bonham called about doors that had stopped latching and a long diagonal crack above the living room window. The home was a single-story brick built in the late 1960s on the Bonham Marl. Our elevation survey showed 2 inches of settlement along the east wall, with the worst drop at the back corner where a large pecan tree had dried out the clay within 10 feet of the slab.
We installed 16 ST3 piers along the east and south perimeter, brought the slab back within a quarter inch of level, and finished before 3 PM. Total cost was $6,800. The homeowner’s front door closed flush that same evening.
Every Bonham home is different, and the right pier depends on what is happening underground. We carry three systems. Your inspector will recommend the one that fits your soil depth, your home’s load, and how far the slab has already moved.
Most Affordable
ST1 System
Concrete Pressed Piers
Starts with 1 ft of steel, then all concrete. 11,980 PSI cylinders, nearly 2x stronger than the industry standard. A good fit for lighter homes on the more calcareous clay found west of Bonham toward Ector and Savoy.
Starts with 3 ft of steel, then concrete. Punches through shallow hard layers and reaches about 50% deeper than the ST1. This is our go-to for Bonham homes sitting on the thick Bonham Marl. It handles the depth and plasticity of the clay here.
Starts with 10 ft of double-walled steel, reaching about 2x the depth of the ST1. Reserved for severe cases with deep active clay. Some properties near Bois d’Arc Lake or along the creek bottoms in Fannin County need this because the saturated clay runs deeper than normal.
Most Bonham jobs wrap up in one day. Our crew digs at each pier location along the perimeter, drives the pier to refusal, and lifts the slab back toward its original position. Steel brackets lock everything in place. Every hole is backfilled and compacted before we leave. You can stay in the home the entire time.
Your free lifetime transferable warranty starts the day we finish. If you sell your house later, the warranty transfers to the buyer at no cost. We also offer 0% interest financing with 6, 12, or 24-month terms and no payments required.
Our Office — McKinney HQ
We serve Bonham from our McKinney headquarters at 1402 Custer Rd #904, McKinney, TX 75070. About 45 minutes south on TX-121. Open Monday through Friday, 7:30 AM to 6:00 PM.
Bonham Areas & Fannin County Communities We Service
We serve all of Bonham and the surrounding Fannin County communities. These are the areas where we get the most calls.
Downtown Bonham North Bonham Sam Rayburn Drive Area Lake Bonham Bois d’Arc Lake Area South Bonham / Hwy 78 Ravenna Savoy Ector Honey Grove Dodd City Ladonia Leonard Trenton Telephone
Foundation Repair FAQs — Bonham
Most Bonham foundation repairs fall between $2,500 and $12,000. The total depends on how many piers your home needs and how far the slab has settled. We offer 0% financing for up to 24 months with no payments.
Bonham sits directly on the Bonham Marl, a thick Late Cretaceous clay formation that was literally named after this town. It swells when wet and shrinks when dry, putting constant stress on slabs. The older housing stock in town, many homes built in the 1950s through 1970s, compounds the problem. The 2021 creation of Bois d’Arc Lake has also shifted moisture patterns in the surrounding soil.
Diagonal cracks in drywall near door and window corners. Doors that stick or will not latch. Stair-step cracks in exterior brick. Floors that slope or feel uneven. Gaps between walls and ceilings or around window frames. An unexplained jump in your water bill, which can point to a slab leak caused by foundation movement.
Yes. Every inspection is free, no obligation. We drive up from our McKinney headquarters, about 45 minutes south. We take elevation measurements across your full slab, evaluate drainage and grading, and check the soil conditions. You get a written report. If you do not need repair, we will tell you.
Most repairs finish in a single day. The crew digs at each pier location, presses the piers to refusal, and lifts the slab back toward level. Steel brackets hold everything in place. All holes are backfilled and compacted before we leave. You do not need to move out.
We use three systems: the ST1 (concrete pressed piers, most affordable), the ST3 (steel and concrete hybrid, our most-installed system in Bonham), and the ST10 (deep steel piers for severe settlement or deep active clay). Your inspector picks the right one based on your soil conditions and how far things have moved.