An old coal town core, a wave of new subdivisions on both sides of Highway 20, and sandstone ridges that give way to shale clay in the low spots.
Collinsville is growing faster than almost anywhere else on the north side of the metro. Five subdivisions are going in at once and the city is laying new water loops to keep up. But the old town is still there, a grid of early 1900s houses around Main Street that went up when coal was coming out of the ground on the edge of town. The two halves have almost nothing in common underneath, and that's where we start.
We cover the whole Collinsville area. That's the original townsite around Main Street, Broadway, and Center Street, the 1970s and 1980s houses that filled in around Herald Elementary and the high school, and the big newer plats on both sides of Highway 20: Georgetowne, Ashbury Park, Winding Creek, Hobbs Creek, and the subdivisions coming out of the ground along 136th and 146th Street North off US 75. We work the acreage lots on 176th Street North and the county roads out toward Oologah Lake, and we don't stop at the Rogers County line.
There's a soil series named after this town, and it tells you a lot. The Collinsville series is a thin loam, 4 to 20 inches deep, sitting on Pennsylvanian sandstone. It drains fast and sits on the ridge crests, along with the similar Bates soils. Houses on that ground have rock right under the slab. They rarely settle much, but they're also the first ground to go bone dry in August, and the thin soil over the rock can shrink enough to drop a slab edge a quarter inch.
Off the ridges it's a different story. The slopes and flats between them are Dennis and Okemah soils, deep clay weathered from shale. That's the same expansive clay that moves foundations all over Tulsa County, and it's the ground most of the new Highway 20 subdivisions were graded across. Spring rain swells it. A summer like 2022 or 2024 shrinks it. A slab with 18 inch grade beams rides every bit of that.
The real Collinsville problem is cut and fill. Rolling pasture got pushed flat for the new plats, so one side of a lot is cut down to native clay or rock and the other side is built up with fill. If that fill went in loose, it settles under the slab over the first few years. Year two through five is when the phone rings. Our post on the early signs of foundation trouble covers what to watch for in a new house.
Old town is pier and beam. A lot of those houses went up between 1900 and 1930 on brick or native sandstone piers with a shallow crawl space, and plenty have had a century of amateur repairs underneath. The mid century ring is early slab on grade. Everything built since about 2000 is a conventional or post tension slab, and the newest plats are almost all post tension. Post tension slabs resist cracking, but they don't stop a corner from sinking when the fill under it gives way. They just crack less while they tilt.
New build corner settlement in the Highway 20 subdivisions, usually the garage corner on the fill side of the lot, showing up as a crack over the garage door and a gap at the brick ledge. Pier and beam sag in the old town grid. Sunken driveways and front walks on the newer streets where the utility trenches were backfilled loose. And a few slab edge drops on ridge lots after the 2024 dry summer.
On fill lots we use helical piers. They screw through the loose fill to a measured torque in the native clay or down onto the sandstone, which is exactly what you want when the depth to good ground changes from one corner of the house to the next. On ridge lots where sandstone is close, push piers hit refusal quickly and the job goes fast. Old town pier and beam homes get jacked back to level and reshimmed, with new concrete pads where the brick piers have crumbled, and crawl space encapsulation if the wood underneath is taking on moisture. Driveways, garage aprons, and patios get polyurethane foam leveling. Not sure which foundation you have? Read pier and beam versus slab in Oklahoma.
Collinsville jobs typically run inside the same range as the rest of the Tulsa metro. New build corner fixes often land at the low end.
We give written quotes after a free inspection. No phone estimates.
Most of the new subdivisions along Highway 20 were graded flat out of rolling pasture. That means part of every lot is cut and part is fill. If the fill wasn't compacted in thin lifts, it settles under the slab in the first two to five years. The corner over the deepest fill drops first. Piers that reach the native soil underneath are the fix.
Both, often on the same lot. The ridge crests are the Collinsville series, a shallow loam that hits sandstone 4 to 20 inches down. The slopes and flats are Dennis and Okemah clay over weathered shale, and that clay swells and shrinks the same way Tulsa clay does. We check which one you're on before we recommend anything.
Rarely, but it's worth knowing about. Collinsville was a coal town, and some of the older ground around the original townsite was mined close to the surface. Most foundation problems we see in old Collinsville are ordinary pier and beam settlement, not mine related. If something looks unusual we'll tell you and point you toward the right engineer.
Yes. Collinsville sits right on the Tulsa and Rogers county line and some newer plats fall on the Rogers side. We cover the whole area including the county roads toward Oologah Lake.
Usually, yes. We drill small holes, pump polyurethane foam under the slab, and lift it back to grade. Most Collinsville driveway and garage apron jobs are done in a few hours and you can drive on it the same day.
We come look, you get a written quote. No pressure.