Concrete Repair Cost: Patching, Resurfacing and When to Replace

Quick reference: the terms that change the price

Four terms explain most of the gap between two quotes for the same job.

Cost by problem

The same crack can be a $150 patch or part of a $2,300 resurfacing. The diagnosis decides the price, not the size of the crack.

Repair or replace

Repair when the slab is stable and the damage is at the surface. Replace when the base has failed, the slab is broken into moving pieces, or the drainage cannot be corrected in place.

A useful test: if the slab moves as one piece, repair can work. If it moves in several pieces, the base is gone and a new surface will fail with it.

Crack types and what they mean

Hairline cracks are cosmetic and can be sealed. Straight cracks that follow a joint are usually the joint working. Wide, uneven cracks or cracks with one side higher than the other point to movement and need a base or drainage diagnosis.

Map the cracks with photos and a ruler before calling. The pattern tells a good contractor what caused the damage.

Resurfacing: what it fixes and what it hides

Resurfacing adds a thin layer over the slab. It fixes spalling, staining and a worn surface. It does not fix a moving base, and it will delaminate if the slab is wet or dirty when it is applied.

Preparation is the job: clean, etch or grind, repair cracks, then apply the overlay. A cheap resurfacing without prep is a coating that peels in a season.

Sealing and maintenance

Sealing slows water, salt and staining and is the cheapest maintenance a slab can get. It does not fix cracks or restore a spalled surface. Re-seal every few years, and avoid de-icing salt in the first winter after a repair.

Keep joints clean, extend downspouts and fix ponding. Most repairs fail because the water that caused the damage was never redirected.

A worked example: a 24 by 24 driveway

A 24 by 24 ft driveway is 576 sq ft. Patching cracks and small imperfections at $1.75 to $2 per square foot is about $1,000 to $1,150. Resurfacing the same area at $2.50 to $4 is $1,440 to $2,300. Lifting a sunken section at $3 to $6 is about $1,700 to $3,500 for the full area, though lifting is usually priced per section.

That is why the same driveway gets quotes a factor of two apart: they are different jobs.

DIY patching or a contractor

Small cracks, potholes and joint repair are reasonable DIY jobs with the right patching material and a wire brush. Resurfacing a whole driveway, lifting a slab or repairing a base is contractor work.

For DIY, clean and route the crack, use the product at the right temperature and keep traffic off for the stated cure time. The preparation is what makes a patch last.

What a repair quote should include

Ask for the problem, the method, the product, the area, the preparation and the cure time. A quote that does not name the product or the preparation is a placeholder.

Compare quotes on the same diagnosis. If contractors disagree about the cause, get a third opinion before spending on a surface repair.

Mistakes that shorten a repair

• Filling cracks without routing and cleaning them.
• Resurfacing over a wet or dirty slab.
• Patching over a base that is still moving.
• Using the wrong product in cold or wet weather.
• Skipping drainage fixes that caused the damage.

Each of these turns a repair into a repeat job within a season or two.

When to call an engineer

Concrete repair is the right trade for flatwork. It is the wrong trade when the house is moving: sticking doors, widening foundation cracks or a floor that slopes with the driveway outside.

An engineer report is $450 to $600 in published data, and underpinning runs $1,250 to $3,100 per pier. A diagnosis is cheaper than the wrong repair.

Repair by surface type

Driveways take the most abuse and often need patching plus joint repair. Patios fail at the surface from freeze-thaw and need resurfacing more often than structural repair. Garage floors are usually sound but stained, which is a cleaning and sealing job. Pool decks need slip-resistant finishes and careful drainage.

The surface type changes both the product and the price. A repair method that works on a garage floor may not survive a driveway winter.

Repair versus replacement over ten years

A patch that lasts three years and is repeated twice can cost more than a replacement that lasts 20 years. Resurfacing buys time when the base is sound; replacement is the lower long-term cost when it is not.

Add up the repairs you expect over a decade, then compare that with a replacement quote. The cheaper invoice this year is not always the cheaper decade.

How to brief a repair contractor

Send photos with a ruler, describe when the damage appeared, and say what you want: a safety fix, a cosmetic refresh or a permanent repair. Ask for the diagnosis, the product names and the warranty in writing.

A contractor who quotes without looking at the drainage is guessing. The diagnosis is the cheapest part of the job and the one that decides the rest.

Repair methods compared

Each step fixes more and costs more. The mistake is jumping to replacement when a patch works, or patching when the base has failed.

Sealing, joints and preventive care

Sealing slows water and salt damage and is the cheapest maintenance. Joints need refilling when the sealant pulls away, and cracks should be routed and filled before water gets under the slab.

Prevention is mostly water management: clean gutters, extended downspouts, a slope away from the slab and no ponding at the edges. A dry slab lasts much longer than a wet one.

What causes concrete to fail

The common causes are a thin or poorly compacted base, water under the slab, too little or too much water in the mix, missing control joints and de-icing salt in the first winter. Freeze-thaw cycles make all of them worse.

Knowing the cause changes the repair: a crack from a missing joint is a joint problem, while a crack from settlement is a base problem. Fix the cause or the repair returns.

Patios, driveways and garage floors

A patio usually needs surface repair: spalling, stains and joint repair. A driveway needs surface repair plus crack repair and often joint work. A garage floor is usually sound and needs cleaning and sealing rather than structural repair.

The same contractor may do all three, but the products differ. A repair method that suits a garage floor may not survive a driveway winter.

Warranty and workmanship

Ask what the repair warranty covers: the product, the workmanship, or both. Resurfacing warranties often exclude damage from water, salt or a moving base, which are the most common causes of failure.

Get the preparation steps in writing. A warranty on a repair applied over a wet slab is not worth much.

A worked example: a spalled patio

A 300 sq ft patio with widespread spalling and a few cracks: patch the cracks, grind or clean the surface, apply an overlay and seal. At $2.50 to $4 per square foot for resurfacing, that is $750 to $1,200, plus crack repair and sealing.

Replacing the same patio is $5 to $24 per square foot, or $1,500 to $7,200. Repair is the right first step when the base is sound and the damage is at the surface.

A simple maintenance calendar

Spring: check for new cracks and settled sections, clean joints. Summer: seal if needed and fix drainage. Fall: clear leaves and extend downspouts before the wet season. Winter: avoid de-icing salt on new concrete and keep water from pooling.

An hour of maintenance a year is cheaper than any repair on this page.

Repair cost by area

Rates are national ranges; local labour and access move the totals. Use the table as a filter before comparing quotes line by line.

Deep patch versus surface patch

A surface patch fills the top of a crack or spall. A deep patch removes the damaged concrete back to sound material and rebuilds it. Deep patches last longer but cost more per square foot and take longer to cure.

If the damage is shallow and the slab is sound, a surface patch is enough. If the concrete is breaking away in chunks, a deep patch is the honest repair.

How long a repair lasts

A patch in a stable slab can last years. Resurfacing over a sound base can last a decade with sealing. A repair over a moving slab fails within a season or two, regardless of the product.

Warranty length is a clue: a contractor who warranties workmanship for a year expects the prep to hold. Ask what voids the warranty before you sign.

Hiring checklist

Check licensing where required, ask for photos of repairs after a winter, get the diagnosis and product names in writing, and confirm the cure time and traffic plan. Compare at least two quotes on the same scope.

A contractor who will not put the preparation in writing is a risk, no matter how low the price.

Preventive budget versus reactive repair

Sealing every few years and fixing joints early costs a fraction of resurfacing or replacement. A small annual maintenance budget prevents the large repair that shows up after a hard winter.

Set aside roughly the cost of sealing your slab every two to three years, and fix cracks before they widen. That is the cheapest concrete repair plan there is.

Repairing steps, curbs and small slabs

Small concrete elements are priced differently from flatwork. Steps, curbs and pads are often quoted as a minimum job, so a small repair can cost as much as a much larger one per square foot.

Group small repairs into one visit where possible. A contractor who is already on site for a driveway patch can fix a step edge for far less than a separate call-out.

Repair products: what to use where

Small cracks take a pourable crack filler or a flexible sealant. Potholes and spalls take a patching mortar or epoxy. A whole worn surface takes a resurfacing overlay, and a settled slab takes lifting material. Using the wrong product is the most common reason a repair fails.

Ask the contractor what product they plan to use and why. A product specification is a sign of a serious repair quote.

Repairing steps and small slabs

Steps and small pads are often priced as a minimum job, so the per-square-foot rate looks high. The forming and the finish take almost as long on a small stair as on a large slab.

Group small repairs into one visit: a step edge, a joint and a crack can be fixed in a single call-out, which costs less than three separate visits.

Seasonal timing for concrete repairs

Patching and sealing can be done across a wider temperature range than resurfacing. Resurfacing needs dry, mild weather and a surface that is not frozen. Lifting can be done in most weather but the patching and curing need care in the cold.

Plan surface repairs for spring or early autumn, and use the winter for diagnosis and quotes. A repair rushed in bad weather is the one that fails first.

What to do after a concrete repair

Keep traffic off for the stated cure time, keep water away from the repaired area and check the patch after the first wet and cold spell. A repair that survives a winter is likely to last.

Keep the product names, the date and the contractor details with your home records. Future owners, insurers and repairers will ask for them, and the record is free to keep.

Repair and the value of the property

A repaired driveway or patio improves the first impression of a home and removes a safety issue, which matters at inspection and at sale. A patch that is done well is not a defect; a crack that has been ignored often reads as neglect.

Keep the repair receipt and photos with the house records. When a buyer or inspector asks about the concrete, a dated record is a better answer than a memory. It also helps the next contractor see what was done and which product was used, so a future repair builds on the record instead of starting over.

What this guide does not cover

Some jobs depend on things a national range cannot see. These are the ones where you need a local quote or an engineer.

• Structural foundation movement, which needs an engineer.
• Sewer, drainage or utility problems under the slab.
• Full-depth slab replacement, priced separately.
• Engineered repair designs for commercial loads.
• Permits and inspections that vary by city.

Concrete repair prices and contractors by state

Ranges here are national with a checked month. Local prices move with labour rates, climate and permit rules, so check your state before comparing bids.

Run the full calculator for your own dimensions: open the calculator →

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