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Most slab cracks 1/4 inch wide or narrower can be filled with one DIY slab kit, which covers roughly 40 to 100 feet of crack in the small size; prices are below. A contractor prices the job by crack length, width and the state of the slab. A slab that has sunk, tilted or cracked all over needs lifting or replacement, which is priced as a different job.
A DIY slab kit is the cheapest way to fill cracks 1/4 inch wide or narrower in a driveway, patio, sidewalk or garage floor. One small kit covers a lot of crack, so the price per foot drops fast. A contractor makes sense for long runs, wide cracks or a slab that has moved, and the price is set by the job.
If you don’t know what kind of crack you have yet, the concrete crack guide sorts them by location and width.
How much does concrete crack repair cost?
For a DIY repair, the cost is one kit plus a bag of sand. The kit you need depends on whether the slab is indoors or out and how many feet of crack you have.
| Damage | What fixes it | Who does it | What sets the price |
|---|---|---|---|
| Cracks 1/4 inch or narrower, edges level | Slab crack kit | You, or a concrete contractor | Kit size, or the contractor's quote by length |
| Cracks wider than 1/4 inch, edges level | Find the cause first, then a deeper fill | Concrete contractor | Width, depth, cause |
| Control or expansion joints | Joint filler | You, or a contractor | Total joint length |
| Sunken or tilted panel | Lifting the slab | Slab lifting contractor | Number and size of panels |
| Cracks everywhere, crumbling surface | Replacing the section | Concrete contractor | Area removed and poured |
We don’t print contractor price ranges, because none of the ones we found come from a source we can check. What we can show is the DIY cost, what moves a contractor’s quote, and what a written quote should list.
How much does a DIY slab crack kit cost?
A small slab kit costs $84.95 for indoor slabs and $109.95 for outdoor ones. Both cover about 40 to 100 feet of crack opened to 1/4 by 1/4 inch, according to their product pages.
Pick by where the crack is and how much of it there is:
- Indoor, small: $84.95. About 40 to 100 feet. For basement and garage floors out of the sun.
- Indoor, medium: $149.95. About 80 to 200 feet. Its universal cartridges fit a standard caulk gun you supply.
- Indoor, large: $279.95. About 100 to 250 feet, with a dispensing gun included.
- Outdoor, small (UV stable): $109.95. About 40 to 100 feet. For driveways, patios, steps and sidewalks.
- Outdoor, large (UV stable): $314.95. About 100 to 250 feet, with a dual dispensing gun included.
- Joint filler, 30 ft: $159.95. About 30 feet of control or expansion joint.
Dry silica sand isn’t included in the small, medium or small UV kits, so add a bag to the cost; check the large kits’ product pages before you buy. For joints, which are cut on purpose and move with the seasons, see the expansion joint repair guide instead of filling them like cracks.
The kit’s written method covers cracks up to 1/4 inch, grinding narrow ones open to 1/4 by 1/4 inch first. The concrete crack repair guide walks through it, and the product chooser matches a kit to your slab.
Driveway crack repair cost
Driveway crack repair costs one outdoor kit for most driveways: the small UV kit covers about 40 to 100 feet. Measure every crack with a tape before you buy, and step up to the large UV kit if the total is over 100 feet.
A driveway needs the UV-stable kit because it sits in full sun. The driveway crack repair guide covers the method, curing and when you can drive on it.
The cost changes when the driveway itself has moved. A panel that sank or tilted needs lifting, which the sinking slab guide covers, and a driveway cracked all over may cost less to replace than to patch; the repair or replace guide helps you decide.
What drives a contractor’s price for concrete crack repair?
Length, width and the state of the slab. A wide crack or a slab that moved is a bigger job than filling narrow cracks, and the quote reflects that.
- Total length. Material and labor both scale with how many feet of crack there are.
- Width. Narrow cracks get ground open first. Cracks over 1/4 inch need the cause found before they’re filled; the large crack guide explains why.
- Movement. An offset or sunken edge turns crack filling into slab lifting, grinding or replacement.
- Surface damage. Scaling or spalling around the crack adds patching. The spalling and scaling guide covers that repair.
- Sealing. Some quotes add a sealer over the whole slab after the cracks are filled. Ask whether it’s included and which product.
The American Concrete Institute says the cause of the damage must be assessed and corrected (opens in a new tab) before concrete is repaired. A quote that only fills cracks on a slab that’s still moving buys you a repeat job.
DIY vs a contractor: which is the better deal?
DIY is cheaper for cracks 1/4 inch or narrower with level edges, which covers most driveway, patio and garage floor cracks. A contractor is the better deal for wide cracks, long runs you’d rather not grind, and slabs that moved.
| DIY slab kit | Concrete contractor | |
|---|---|---|
| Cracks it fits | 1/4 inch or narrower, edges level | Any, including wide cracks and moved slabs |
| Tools you need | Grinder with a diamond blade for narrow cracks, shop vacuum, caulk gun (included with the large kits), scraper | None |
| Who diagnoses the crack | You | The contractor |
| Warranty | None on the labor; it's your work | Whatever the written contract says |
| How the price is set | Fixed kit price plus sand | Quote per job |
The why repairs fail guide lists the mistakes that send people back for a second kit, so you only pay once.
What should a written concrete repair quote include?
The work, the materials, the completion date and the price, in writing. The Federal Trade Commission lists those as the minimum for a written home improvement estimate (opens in a new tab), and says not to automatically choose the lowest bidder.
For crack repair, also ask the quote to name:
- Which cracks, by location and length
- The filler product and whether narrow cracks get ground open
- Whether any slab lifting, grinding or replacement is included
- Whether a sealer goes on afterward, and which one
- The warranty in writing, and what voids it
- The payment schedule
The FTC also says to confirm the contractor’s license with your state or county, ask for proof of insurance, and not pay the full amount up front. Pressure to decide today and leftover materials from “a job in the area” are on its list of red flags.
Should you seal the slab after the repair?
Sealing is optional, and it adds the cost of a sealer to the job. The sealing guide covers whether your slab needs one and how long to wait after the fill.
Questions
Why doesn't this page give contractor prices?
We only print numbers we can trace to an independent source, and we didn't find one for contractor crack filling. Cost estimate sites publish ranges, but not data we can check. Two written quotes for your own slab will tell you more.
Is the sand included in the slab kit?
No. The small, medium and UV small kits' product pages all say sand is not included. Buy a bag of dry silica sand with the kit.
Do I need the UV kit for a garage floor?
Not usually. The indoor kits are made for slabs out of the sun, like basement and garage floors. Use the UV kit for driveways, patios, steps and anything else in daylight.
Can one kit do my driveway and my patio?
Yes, if the total crack length fits the kit's coverage and both are outdoors. Add up every crack first; the small UV kit covers about 40 to 100 feet at 1/4 by 1/4 inch.