Almost every house here has a basement. Most sit on Dawson clay.
Castle Rock builds basements almost by default, and the town's housing stock, laid down in rings from the 1990s through the 2020s, means thousands of below-grade slabs poured over the Dawson Formation. That formation carries expansive clay layers, and a basement floor is the one slab in your house that sits directly on them, below the depth where the soil ever really dries to a stable state. When those layers move, the floor moves. When the overdig backfill around the foundation keeps consolidating years after construction, the floor near the walls moves too.
What homeowners notice first is rarely the slab itself. It's the finished floor telling on it: laminate that clicks and flexes in one corner, a gap opening under the baseboard, a crack telegraphing through tile along the expansion joint.
Settled floor or moving foundation? We check before we quote.
Not every out-of-level basement is a slab job, and we won't pretend otherwise. During the estimate we look at the foundation walls, the corners, and how the doors behave upstairs. If the walls themselves are moving, lifting the floor would paper over a structural problem, and we'll tell you to get a structural engineer involved before anyone pumps anything. If it's the slab alone, which is the common case in Castle Rock's younger houses, we can fix it from below without touching your finished space.
What snowmelt at 6,220 feet does below grade
This is the highest, coldest town in our service area, and its heavy late spring snows melt into the ground right against foundation walls. Some of that water tracks down the old excavation line, the loosest soil on the lot, and either swells the clay under the slab or carries fines out of the backfill and leaves voids. Big day-night temperature swings keep surface water cycling all winter. Either way, the slab loses uniform support, drops where the soil gave, and cracks where it spans.
Lifted from underneath, finished rooms left alone
We drill 1-1/2 inch holes through the slab, spaced every 4 to 6 feet across the settled area, and pump a slurry of water and sandy loam soil that fills the voids and floats the floor back to level. Then we patch the holes so you can carpet, tile, or epoxy right over them. A few things people are relieved to hear:
- Finished walls stay finished. We keep holes away from the perimeter and tarp everything before drilling.
- No jackhammer, no rubble hauled up the stairs, no concrete truck in the driveway.
- The slurry is inert: cement, water, and sandy loam soil. No foam chemistry curing off-gas in a closed basement.
- Trevor will tell you at the estimate how soon the floor takes foot traffic.
The same visit usually handles the small stuff too: sealing the gap where water has been pooling along the perimeter, packing the void under a settled furnace-room pad, bringing a dropped section at the base of the stairs back flush with its neighbor. If the slab has separated at an expansion joint, we can typically bring both sides to one plane so flooring goes down flat.
The bill, next to the alternatives
Basement lifts are priced by lift area and void volume, quoted free and in person. The alternatives are breaking out and re-pouring the slab, which means demolition inside your home, or underpinning, which is a different order of money entirely. For a floor that has settled but a foundation that's sound, mudjacking is the repair that matches the actual problem. One thing it is not: waterproofing. If water is coming in, that needs its own fix, before or alongside the lift, and we'll say so plainly.
Start with the free look
Trevor walks every basement himself before we quote it. He'll tell you whether it's a slab problem, a drainage problem, a wall problem, or some mix, and what the fix costs. That visit is free and there's no obligation on the other side of it. You can see finished jobs on our work page, and the basement floor leveling page covers the method step by step. Call (303) 526-2222 to set a time.