Floor leveling and shims: bringing a sloped, uneven floor back toward level

Floor leveling corrects an uneven or sloped floor by re-supporting the framing under it and, where the structure allows, raising it gradually back toward level. The work happens from below, in the crawl space or basement, where adjustable steel supports are set on firm footings beneath the low points of the floor and raised to meet the beams and joists above. Shims, thin load-bearing spacers, are placed between the supports and the framing to close small gaps and create firm, even contact across each beam. Because a floor is rarely off by a uniform amount, shimming lets the crew distribute the load evenly and make fine adjustments that a support post alone cannot, so the floor is stabilized and brought as close to level as the structure safely allows.

It usually starts in the soil under your home. In the Piedmont around Charlotte, Greensboro, Winston-Salem, and the Triangle, clay-rich soils swell in wet seasons and shrink in dry ones, and that repeated shrink-swell cycle can settle or shift the original support piers under the crawl space. Once a pier drops, the beam it held loses height and the floor above slopes. Along the coast near Wilmington, Brunswick County, and Leland, a high water table and saturated, sandy soils can soften the ground beneath the supports while the same moisture rots the wood beams and joists. In the Sandhills near Fayetteville and Pinehurst, sandy soils shift and drain differently than Piedmont clay, and on Asheville-area slopes, runoff and heavy rainfall can undermine hillside supports over time. The slope feels the same from upstairs, but we identify the specific cause under your home during the inspection.

The first job of floor leveling is to re-support the framing and stop the floor from dropping further, which is the priority for protecting the structure. From there, because the supports are adjustable and the shims are precise, the crew can raise the low sections gradually to recover much of the height the floor has lost. How close to flat the floor can get depends on the framing, the finishes upstairs, and how far it has settled, and the lift is done in measured stages rather than forced all at once so it does not crack the drywall, tile, and trim above. We are honest with homeowners about what is achievable for their specific floor rather than promising a perfectly level result.

Not on its own. The supports and shims carry the framing, so that framing has to be sound for the correction to hold. If a beam or joist is rotted or cracked, it usually needs repair or sister reinforcement first, because supporting and shimming wood that cannot carry the load is not a lasting fix. In the Carolinas, especially in damp coastal crawl spaces near Wilmington and Leland and in homes where moisture has sat under the floor, rot and support failure often go together. That is why our inspection looks at both the supports and the condition of the wood, and why we may recommend framing repair alongside the leveling so the supports have something sound to carry.

Leveling re-supports the floor, but it does not change the conditions that caused the support to fail in the first place. In slow-draining Piedmont clay or in saturated coastal soils around Wilmington and Leland, ongoing moisture is frequently part of the story, both because it softens the ground under the supports and because it rots the wood above them. To keep the floor from sloping again, the moisture that drove the problem often needs to be managed too, which is why we frequently pair floor leveling with drainage, a vapor barrier, or encapsulation. We confirm what your crawl space needs during the inspection rather than treating the support in isolation.

There is no flat price, because cost depends on how much of the floor is affected, how many adjustable supports and footings the soil and framing call for, how far the floor has settled, whether any rotted or cracked beams and joists need repair first, access under the home, and whether moisture work like drainage, a vapor barrier, or encapsulation is recommended alongside the support. A single settled span and a home with widespread support failure and rotted framing sit at very different ends of the range. Rather than quote a number online, we provide a written estimate after a free, no-pressure inspection, and financing options are available.

Let's take the first step toward a healthy home.

A local specialist will inspect your foundation, walk you through the findings, and send a clear estimate. no cost, no pressure.