Concrete crack repair & resurfacing
Not every tired-looking slab needs replacing. Surface cracks can be filled and a worn top can be resurfaced with an overlay — both far cheaper than tear-out. This guide prices cosmetic concrete repair and explains where the honest limits of a surface fix lie.
Two surface fixes, two formulas
Cosmetic concrete repair splits into filling cracks (a per-linear-foot job) and resurfacing a worn top (a per-square-foot overlay):
Crack repair = crack length (ft) × price per linear ft
Resurfacing = ( area × price per sq ft overlay + coating ) × (1 + contingency%)
Price them in concrete crack repair cost and concrete resurfacing cost. As always, you enter the rate.
Worked examples
Crack repair: 30 linear feet of surface cracks at $10 per foot = 30 × $10 = $300. Filling cracks is inexpensive because it is material-light and fast — the cost is labor and a good sealant, not concrete.
Resurfacing: a 300 sq ft patio at $4 per square foot for the overlay plus $200 for a protective coating: ($1,200 + $200) × 1.10 = $1,400 × 1.10 = $1,540. Resurfacing renews the whole visible surface for a fraction of a full replacement, which would run several times as much.
Cosmetic, not structural — an important line
These are surface, cosmetic repairs. Filling a crack in a driveway or patio restores appearance and keeps water out of the surface; resurfacing renews a worn top. Neither is a fix for a structural problem — a slab that is heaving, a foundation crack that leaks, or below-grade water. If water is coming through a basement or foundation wall, that is waterproofing, a different trade entirely, and not what these tools estimate. When in doubt about whether a crack is cosmetic or structural, have a professional look before you spend on a surface fix.
Seal, repair, resurface or replace?
| Condition | Usual fix |
|---|---|
| Good slab, dull or porous surface | Clean & seal |
| Hairline / narrow surface cracks | Crack repair (fill) |
| Worn, stained or spalled top, slab sound | Resurface (overlay) |
| Slab settled but intact | Level (mud/foam jacking) |
| Slab crumbling / structurally failed | Replace |
The cheapest fix that matches the condition is the right one. Sealing a sound slab every few years (150–250 sq ft per gallon per coat, labeled — size it in the sealer coverage calculator) is the least expensive maintenance of all and often postpones the need for anything more. For a settled-but-intact slab, see mudjacking vs foam leveling before you consider resurfacing or replacement.
Making a repair last
- Prep is everything. An overlay or crack filler only bonds to clean, sound concrete; skipping cleaning and profiling is why cheap repairs fail.
- Match the product to the gap. Hairline cracks want a thin, flexible filler; wider ones need a backer and a proper patching compound.
- Seal afterward. A finish coat or sealer protects the repair and evens the color.
- Fix the cause. If a crack keeps returning, something is moving underneath — a surface fill will not hold until that is addressed.
Choosing the right repair product
The material matters as much as the method. For cracks, a thin, flexible crack filler or sealant suits hairline and narrow gaps that will keep moving slightly; a sanded patching or concrete-repair compound suits wider cracks and small spalls, ideally with the crack cut into a clean groove first so the filler has something to grip. For a worn top, a resurfacer or micro-topping lays a thin (often feather-edge to a quarter inch) new wear surface over sound concrete; a self-leveling underlayment fills low spots and flattens a floor. The wrong product is the usual reason a repair fails early — a rigid filler in a moving crack cracks again, and an overlay over a dirty or unsound slab peels. Read the product's crack-width and thickness limits and match them to what you actually have.
DIY or hire it out
Scale decides this one. Filling a few feet of surface cracks or sealing a sound slab is a genuine weekend DIY job — inexpensive materials, forgiving work, and a result that only has to look tidy. Resurfacing a whole patio or floor is a different animal: overlays are unforgiving about surface prep, mixing consistency and working time, and a botched overlay can leave you worse off (and needing removal) than before. As a rule of thumb, DIY the small, localized fixes and hire out anything that covers a large area, needs a smooth uniform finish, or has to bond reliably to hold up under traffic. Whichever you choose, the numbers in crack repair and resurfacing let you compare the material-only cost of doing it yourself against a contractor's all-in quote.
The bottom line
Crack repair = length × your $/ft (about $300 for 30 feet); resurfacing = (area × your $/sq ft + coating) × contingency (about $1,540 for a 300 sq ft patio). Both are cosmetic surface fixes that beat replacement when the slab is sound — but they are not structural or waterproofing repairs. Price yours in crack repair and resurfacing; results are planning estimates, so get itemized quotes.