Garage floors take more weight per square foot than almost any other slab in the house — and they sit on whatever fill the original builder put down. In Phoenix, that fill plus our soils plus a few decades of irrigation and monsoon water means garage settlement is everywhere.
What garage settlement looks like
- Visible gap between the bottom of the garage door and the floor
- The slab pitches toward the back wall — water tracks in instead of out
- A crack across the slab with one side noticeably lower
- The control joint near the apron has dropped at the front of the bay
- The floor coating is cracking along the slab settlement line
How we level garage floors
- We map the slab, find the low points, and identify any voids beneath it
- We drill penny-sized (5/8") injection holes through the slab
- We inject high-density polyurethane foam — it expands, fills voids, lifts the slab
- Laser-level the lift back to grade, restoring proper slope to the apron
- Patch the holes flush — coatings that were intact stay intact
- Park on it the same day
Why garages settle in Phoenix
Most garage slabs in the Valley sit on minimally compacted granular fill or native clay. Add irrigation that runs along the side foundation, plumbing leaks under the slab, monsoon runoff against the apron, and the constant load of vehicles cycling onto the slab — and you get settlement. Newer homes are not immune; rapid build cycles in Phoenix often shortcut compaction.
Cost
Most Phoenix garage floor lifts run $1,000–$2,800. Severity, square footage, and number of voids drive the price. Replacement is $6,000+ and decouples the slab from any foundation tie-ins — leveling preserves the original structure.