Sealed concrete typically costs $1.50-$4.00 per sq ft when a contractor cleans and seals an existing slab; decorative finishes or substantial repairs can raise the price. The sealed concrete cost per square foot depends mainly on surface condition, sealer type, project size, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Existing concrete cleaning and sealing | $1.50/sq ft | $2.75/sq ft | $4.00/sq ft | Sound slab, standard penetrating or acrylic sealer |
| Decorative or premium sealer application | $3.00/sq ft | $5.00/sq ft | $8.00/sq ft | May include stain, enhanced finish, or added preparation |
| Typical 400-sq-ft patio | $600 | $1,100 | $1,600 | Existing slab, contractor-installed |
What homeowners pay to seal a concrete slab
For a typical residential driveway, garage floor, patio, or basement slab, cleaning and applying a standard sealer generally totals $1.50-$4.00 per sq ft. A 400-sq-ft area therefore costs about $600-$1,600, with an average near $1,100. Larger, uncomplicated areas may receive a lower per-foot quote because setup and travel costs are spread across more surface.
Most ordinary projects fall near $2.00-$3.50 per sq ft when the concrete is in good condition. The estimate assumes standard access and no major crack repair, coating removal, or decorative treatment. Assumptions: U.S. residential labor, existing concrete, normal access, and standard cleaning.
How cleaning, sealer, and labor shape the quote
A contractor’s price usually combines preparation, sealer, labor, equipment, and any repair or disposal charges. The table shows typical component ranges; some contractors quote a single installed price rather than itemizing every task.
| Quote component | Typical price | What changes the charge |
|---|---|---|
| Cleaning and surface preparation | $0.40-$1.50 per sq ft | Oil, dirt, old sealer, and pressure-washing needs |
| Sealer materials | $0.15-$0.80 per sq ft | Penetrating, acrylic, epoxy, or premium formulation |
| Application labor | $0.75-$2.00 per sq ft | Area, edges, access, and number of coats |
| Minor crack or patch work | $2-$8 per linear ft | Crack width, depth, and repair material |
| Old coating removal | $1-$3 per sq ft | Coating thickness and grinding or stripping method |
Preparation and labor often cost more than the sealer itself. For labor estimates, a basic job may require 4-8 hours for a small residential area, including cleaning, application, and setup. Contractor labor commonly works out to about $50-$100 per hour, though bids are often priced by the square foot.
Which slab conditions and sealer types change the price?
Concrete condition is a major cost driver. A clean, sealed-before slab with limited wear may need only washing and one or two coats. Oil stains, peeling sealer, uneven color, or cracks wider than about 1/8 inch can require additional cleaning, grinding, patching, or test applications.
Sealer choice matters as well. Basic penetrating sealers often suit exterior slabs and typically keep material costs modest. Acrylic products can add a sheen or color enhancement, while epoxy or polyurethane systems can cost more and may need more demanding surface preparation. They are not interchangeable: moisture exposure, sunlight, traffic, and the existing finish affect what can be applied.
Removing a failed coating or treating a heavily stained slab can add $1-$3 per sq ft before sealing. A 1,000-sq-ft area may also price differently from a 150-sq-ft walkway because larger jobs can lower the installed rate, while many contractors impose a minimum service charge of roughly $250-$500.
How sealing labor time changes with area and access
A straightforward 200-400-sq-ft patio or garage floor commonly takes a two-person crew about 4-8 hours on site, not counting cure time. A 600-1,000-sq-ft driveway may take 6-10 hours if washing, crack filling, or coating removal is needed. Tight indoor spaces, many steps, or multiple separate areas add setup and edging time.
Drying and cure time can require a longer scheduling window than the actual application. Depending on the product and weather, the slab may need to stay off-limits for 12-24 hours for foot traffic and longer for vehicles. Rain, high humidity, or temperatures outside the product’s application range can delay the work.
Why regional labor rates shift sealed concrete prices
Quotes in high-cost metropolitan areas can run about 15%-30% above the national middle range, while rural markets may be 10%-20% lower when contractor travel is limited. These are broad comparisons, not fixed regional price lists; local demand, insurance, fuel, and crew availability influence the final bid.
Compare local bids using the same square footage, preparation, sealer, and coat count. A lower quote may exclude pressure washing, crack repairs, or removal of an existing coating. Ask whether the price includes sales tax, travel, and a return visit if weather interrupts application.
When repairs, coating removal, or delivery add charges
Some estimates include minor crack filling, while others charge separately. Expect roughly $2-$8 per linear ft for typical crack repairs, with larger or moving cracks requiring a specialist and a separate assessment. Removing a prior coating may add $1-$3 per sq ft; heavy grinding, hazardous material concerns, or disposal can increase that amount.
Confirm that the quoted work addresses the existing surface rather than simply covering it. Sealer cannot reliably fix spalling, structural movement, or moisture pressure beneath a slab. New concrete also needs to cure before sealing, commonly for at least 28 days, subject to the concrete and sealer manufacturer’s instructions.
Three concrete sealing quotes for common project sizes
A 250-sq-ft patio in good condition might cost $500-$875 at $2.00-$3.50 per sq ft. The work could include washing, light edge preparation, and two coats of standard acrylic sealer, completed in about 4-6 crew hours.
A 600-sq-ft garage floor with light oil staining could run $1,500-$2,700 at $2.50-$4.50 per sq ft. This example allows for stronger cleaning and a penetrating sealer, with roughly 6-9 crew hours. A failed coating requiring removal could add $600-$1,800.
A 900-sq-ft driveway with a sound surface may cost $1,800-$3,150 at $2.00-$3.50 per sq ft. A premium decorative finish or extra preparation could raise the total to $3,600-$7,200. These examples are estimates, not guaranteed quotes; surface condition and local rates determine the actual total.
How to lower the sealing bill without cutting corners
Clear vehicles, furniture, planters, and stored items before the crew arrives to reduce paid setup time. Grouping a driveway and adjacent walkway into one visit may lower the effective rate if the contractor can treat the surfaces with the same product and preparation method.
Request itemized bids that state the prep method, sealer type, number of coats, and repair exclusions. Compare at least two or three local quotes, and avoid paying for premium gloss or decorative upgrades unless they suit the slab’s use. Do not skip necessary cleaning or apply a new sealer over peeling material, since failed adhesion can lead to additional removal costs later.