Denver driveways ride on clay that never sits still
We've been lifting driveways in this city since 1988, and the pattern hasn't changed once: the concrete outlives the ground it sits on. Denver Formation claystone runs under most of the city, and in dry years it shrinks hard. The soil pulls back, leaves a gap under the slab, and the slab settles into that gap a season or two later. Your driveway didn't wear out. The ground underneath it moved, and the concrete followed it down.
A mile above sea level, Denver also gets winter and summer in the same week. A warm afternoon melts snow into the control joints, a hard night refreezes it, and the ice pries at the slab base. Run that cycle all winter, every winter, and an apron can lose a little height every year until you're scraping a bumper at the street.
Bungalow drives, alley aprons, and new infill each fail their own way
Denver's housing spans more than a century of construction, and each era hands us a different driveway call.
- Early-1900s bungalows in Wash Park and Berkeley: narrow drives and alley-loaded garages. The apron off the alley takes trash trucks and decades of runoff it was never graded to handle, and it's usually the first slab to go down.
- Postwar ranches: wider driveways poured over fill that's had seventy years to consolidate. The panel at the garage door tips first, and daylight under the weatherstrip gives it away.
- New infill: fresh concrete over freshly disturbed soil. Builder backfill keeps compacting long after closing day, so we lift driveways on homes that aren't ten years old yet.
Alley aprons deserve their own mention because Denver has thousands of them. They're shared, they get driven daily, and nobody looks at them until the drop is deep enough to bottom out a car. We lift them the same way we lift a front drive, and the alley stays open for everything but the morning we're in it.
The months that do the damage
Two stretches of the Denver calendar hit driveways hardest. March and April bring the heavy wet snows, the kind that drop a foot of dense slush and melt inside two days. All that water goes somewhere, and a lot of it goes under slab edges and into any gap the previous dry summer opened. Then June through August is hail season, and the same storms that dent cars can dump an inch of rain in twenty minutes. Claystone can't take water that fast, so it sheets across the driveway and pours into every joint and crack.
Winter freeze-thaw connects the two seasons. It doesn't dig the void, but it works every crack wider so the next spring's water gets in easier. If one panel sat lower this April than last, that's the cycle running right on schedule.
What a Denver driveway lift costs
Most residential driveways here run $600 to $1,800. Tearing out and repouring the same driveway runs $7,000 to $15,000. Where your lift lands in the range depends on how far the slab dropped and how much empty space the slurry has to fill, and Howard puts a written figure on it during a free in-person visit. Our pump truck carries 10 yards of material and parks in the street or the alley, so tight city lots don't add much to the bill.
The honest half of the estimate is knowing when not to lift. A slab in a few sound pieces that's simply sitting low is a textbook lift, and it holds for decades. A driveway crumbled into many small pieces, or scaling across its whole surface, needs replacement, and we'll say so at the curb rather than pump money under concrete that's done.
Half a day of work, then your driveway back
The crew that shows up has been with us for years. We drill 1.5" holes where the slab needs to rise, pump our Portland cement, sand, and topsoil slurry until a 6-foot level reads flat, and patch the holes before we leave. You can walk it that afternoon and drive it the next morning, and every lift carries our five-year written warranty.
The estimate costs nothing and Howard does it in person, usually the same week you call. There's more on the method itself on our driveway leveling page, or you can go straight to requesting a quote. Or just call (303) 526-2222 and tell us which panel dropped.