The patio that tilted before the fence finished weathering
We lift patios all over the Denver metro, and Castle Rock is the one town where the slab is often younger than the shrubs planted next to it. Subdivisions here filled in from the 1990s through the 2020s, which makes this the newest concrete we work on. New isn't the advantage you'd think. A patio behind a recently built house sits on the most disturbed soil on the lot: the foundation excavation gets backfilled, the patio gets poured across the top of it, and that backfill goes on compacting under its own weight for years. The patio rides it down.
By year five or eight the signs show up, and they show up in houses that still smell new. The slab pitches back toward the sliding door. Water sits against the foundation after a storm instead of running to the lawn. The step off the patio has grown taller at one end than the other.
April snow is the roughest month on a slab base here
Castle Rock's late spring snows are the heavy, wet kind, and at 6,220 feet they can arrive after weeks of warm afternoons. They melt fast, and the water lands exactly where a settling patio wants it least: along the slab edges and down the gap against the house. The Dawson Formation clay under much of town drinks that water and swells, then gives it back through the dry summer and shrinks. A base that gains and loses volume like that won't hold a slab level for long, and the town's big day-night temperature swings keep freeze-thaw grinding at the edges most of the winter.
How we put it back
The repair is quicker than most people expect. We drill 1.5 inch holes through the sunken area, pump a Portland cement, sand, and topsoil slurry underneath until the slab floats back to grade, and patch the holes. Stamped and colored patios are fine; we patch with color-matched concrete, and after a season of weathering most owners quit noticing the spots. We're there 2 to 4 hours and you can walk on it the same day.
What the visit fixes in one pass:
- Slope reversed so water sheds away from the house, not against the foundation
- The trip lip at the door threshold and the lawn step brought back to a safe height
- Voids under the slab filled solid, so the next wet spring has nothing to pump through
What it costs against pouring new
Most residential patios run $400 to $1,200, about a quarter of what replacement costs. The judgment call is piece count. A patio in two or three large sections usually lifts back to a single clean plane. A patio in five or more pieces lifts unevenly and opens at every joint, so we'll tell you to replace it instead of selling you a repair that won't hold. That call gets made at the estimate, in person, for free.
Timing matters less than people assume. We lift patios all four seasons, and a fall lift means the slab goes into winter sitting tight on solid material instead of bridging a void that the freeze will widen. The one thing that pauses us is deeply frozen ground we can't drill cleanly, and in most winters that's a short wait, not a long one.
Solve the water or we'll meet again
Almost every sunken Castle Rock patio we lift has a downspout dumping at the slab edge or a grading low spot feeding water under it. We'll point it out during the estimate. Extend the downspout six to ten feet, regrade the low spot, and the lift lasts. Skip it, and the same erosion starts the clock over on a repair you already paid for once. The slurry itself cures harder than the clay around it, so once the drainage is handled the slab stays put. That's why we can offer a 5-year written warranty on the work.
If you want to see how the process compares to other approaches, the main patio leveling page walks through it. When you're ready for a number, Trevor comes out in person, measures the settlement, and hands you a firm quote on the spot. Request a time at our quote page or call (303) 526-2222.