Much of Gainesville sits on about five feet of sand over clay-rich soil, with limestone below that water slowly dissolves. Heavy summer storms soak the sand and wash it down into gaps in the rock. That is why the county sees sinkholes and settling under both old homes near downtown and newer slab homes on the west side.
What it costs
Typical published ranges for Gainesville. The contractor's written estimate is the price, and the inspection is free.
A slab is a flat layer of concrete poured right on the ground. There is no crawl space under the floor. Most homes built in Gainesville in the last few decades sit on one. That includes much of Haile Plantation, which began in the late 1970s. It also includes the newer homes in Tioga and Newberry. Newberry grew from 4,950 people in 2010 to 7,342 in 2020.
Slabs are strong, but they rest on the ground. When the ground under one part sinks, the slab bends or cracks, and the house above it follows.
Why slabs move in Gainesville
The ground under most Gainesville slabs has three layers that matter.
Sand on top. USDA soil surveys show about four to six feet of sand in common local soils. Sand that washes away or packs down leaves a slab with less support.
Clay-rich soil below. Under the sand is a loamy layer with more clay. Water moves slowly there, so the ground can stay wet under one side of a house.
Limestone deeper down. Water dissolves the rock and can open gaps. The county says sand can drain down into them.
Things around the house matter too. The county lists rotting debris buried during building, rotting roots and stumps, leaking pipes, cracked pools and roof runoff. All of them can make the ground under a slab sink.
Signs your slab may be moving
Cracks in tile that run in a line across the room.
Doors that stick or will not latch, most of all in one part of the house.
Cracks over doors and windows that run at an angle.
A gap between the baseboard and the floor.
Cracks in the block or stucco outside, often near a corner.
A floor that slopes so a ball rolls one way.
A sudden jump in your water bill, which can mean a leak under the slab.
How a crew fixes a slab
Piers along the edge
Steel piers are driven down under the edge of the slab until they reach firm ground. The house is lifted a little at a time and set on the piers. This is the most common slab fix.
Inside piers
If the middle of the slab sank, piers may go inside the house. The crew cuts the floor or tunnels under it. This costs more and takes longer, so ask how many inside piers the plan needs.
Foam or grout lifting
For smaller low spots, a crew drills small holes and pumps in foam or grout to raise the slab. This also works on patios, walks and driveways.
Ground fixes
If the soil under the slab is loose or has gaps, grouting may be part of the plan. If a sinkhole is suspected, an engineer or geologist should test first. See sinkhole repair.
Water fixes
If gutters or the yard slope send water to one side, fixing that keeps the repair from failing. See drainage correction.
Plumbing under the slab
Water and drain lines run through or under most slabs. A slow leak can soak the sand under one room. Lifting a slab can also strain old pipes. Ask the crew if they test the plumbing before and after the lift. Ask who pays if a leak shows up.
What a slab inspection covers
Expect the crew to take floor level readings across the whole house, not just the cracked room. They map cracks inside and out. They open and close doors to see which ones bind. Outside, they check gutters, grading, trees and any low spots in the yard. You get a written plan that shows where each pier goes and why.
About these prices
The cost guides above show typical ranges, not a quote. The number of piers, and how many go inside, moves the price most. See the full cost guide for more.
Questions to ask about slab repair
How many piers go outside and how many go inside?
How deep do you expect the piers to go?
Will you test the plumbing before and after?
Does the price include patching the floor and tile?
What does the warranty cover, and does it transfer if I sell?
Frequently asked questions
Can a cracked slab be fixed without tearing it out?
Almost always. Most slabs are lifted and held up with piers along the edge. Low spots inside can often be raised with foam or grout. Cracks are sealed after.
Are slab cracks always a problem?
No. Most slabs get thin shrinkage cracks as the concrete cures. A crack that grows, has one side higher than the other or comes with sticking doors is the kind to check.
My Gainesville home is only a few years old. Can the slab already move?
Yes. The county says buried land-clearing debris and loose fill around pipes can sink over time. New lawns and sprinklers also change how wet the ground is.
Do I need a plumbing test?
Often yes. A leak under the slab can soften the sand under one part of the house. Lifting a slab can also stress old pipes. Many crews test before and after the lift.
What is slab foam lifting?
A crew drills small holes in the slab and pumps in foam that swells and lifts the low spot. It works for sunken patios, driveways and some floor areas. It does not replace piers when the soil below keeps sinking.
How long does slab repair take?
Most outside pier jobs take one to three days. Inside piers take longer because the crew cuts through the floor and patches it after.
Book your free slab inspection
Cracked tile and sticking doors tend to get worse with each rainy season. Call (352) 724-7728 or send the short form. A local crew will call you back, usually the same day, and give you a written price.