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.
Work
Typical range
Inspection and written estimate
Free
Crack sealing or epoxy injectionFixr 2026
$200 to $1,000
Slab foundation repair, if the slab movedFixr 2026
A crack shows where your house is under stress. Sealing it without finding the cause is like painting over a leak. It looks better for a while, then it comes back.
That is why a good crack repair starts with a question. Why did it crack? The answer sets the fix. Some cracks need only a seal. Others need the house supported first.
The cracks Gainesville homeowners see most
Slab cracks
Thin cracks in a concrete slab are common. They often form as the concrete dries. A crack that grows wider or has one side higher than the other is different. It can mean the ground under the slab moved.
Block wall cracks
Many Gainesville homes have concrete block walls with stucco outside. A crack that steps up like stairs along the mortar lines often means one corner settled.
Stucco cracks
Thin, spidery stucco cracks are often surface only. A long crack that runs from a window corner, or one that keeps opening, can point to movement below.
Drywall and plaster cracks
Cracks that run at an angle from the corners of doors and windows are a classic sign of movement. So are gaps where the wall meets the ceiling.
Tile cracks
Tile that cracks in a straight line across a room often sits right over a slab crack.
What causes cracks here
The Alachua County sinkhole fact sheet lists many causes of sinking soil. Only some of them are sinkholes.
Rotting debris. Land-clearing debris buried when the house was built can rot and leave gaps.
Rotting roots and stumps. Old trees cut down near the house can do the same.
Leaks. Leaking water pipes and cracked pools can wash out the sand.
Loose fill. Soil around utility lines that was not packed well can sink.
Runoff. Water from roofs, gutters and pavement can soften the ground at one side.
Sinkholes. Sand draining into gaps in the limestone below.
The county also says soil sinking is common in very wet spells after dry ones. Gainesville gets about 48 inches of rain in a normal year. Many owners see new cracks after a wet summer.
How cracks get fixed
Epoxy injection
For a slab crack that is stable, epoxy is pumped in to bond the concrete back together.
Polyurethane sealing
For a crack that lets water in, foam fills and seals it.
Block and stucco repair
Cracked mortar joints get cut out and refilled. Stucco gets patched and blended.
Older homes near downtown. Many older Gainesville homes sit on piers with plaster or wood walls. Cracks here often show up in plaster over doors, or where an addition meets the old house. Fixing the supports under the floor usually comes before any patching.
Newer slab homes. In newer homes, cracks often show up in tile, drywall and stucco. A crack in tile that lines up with a crack in the wall can point to the slab below. Floor level readings tell the crew if the slab moved.
Homes near a low spot. If a crack shows up near a new dip in the yard, mention it on the call. The crew will look at the yard and the house together.
Questions to ask about crack repair
What caused this crack?
Is the house still moving, or is it stable?
Will sealing it be enough, or does the house need support first?
Does the price include patching stucco, drywall and tile?
What happens if the crack opens again?
Track your crack while you wait
Mark each end of the crack with a pencil line and the date.
Take a photo with a coin next to it for scale.
Check it every few weeks and after big storms.
Note any doors that start to stick.
Bring these notes and photos to your inspection. They help the crew see how fast things are changing.
About these prices
The cost guides above show typical ranges, not a quote. Sealing a crack costs much less than supporting the house. Your written estimate shows which one you need. See the full cost guide.
Frequently asked questions
Which cracks should worry me?
Cracks that keep growing, cracks wider than about a quarter inch and cracks where one side sits higher than the other. Stair-step cracks in block and cracks that come with sticking doors also need a look.
Can I just fill the crack myself?
You can fill a thin cosmetic crack. If the house is still moving, the crack will open again. Find the cause first.
Does a crack mean I have a sinkhole?
Not by itself. Florida law says cracks and settling alone are not a ground cover collapse. Most cracks come from settling, water or the concrete drying. If other signs show up too, ask about testing.
How can I tell if a crack is growing?
Mark each end with a pencil and write the date. Take a photo with a coin for scale. Check it again in a few weeks, and after big storms.
Should I photograph cracks for insurance?
Yes. Dated photos help if you ever file a claim. Florida gives you 2 years to report a sinkhole loss after you knew or should have known about it.
What is epoxy injection?
Epoxy is a strong glue pumped into a crack in concrete. It bonds the two sides back together. Polyurethane foam is used when a crack also lets water in.
Get your crack checked for free
A growing crack is easier to fix now than next year. Call (352) 724-7728 or send the short form. A local crew will call you back, usually the same day, and tell you what caused it.