Concrete cleaning and sealing typically costs $1-$3 per square foot, or about $300-$900 for a 300-square-foot patio. Surface condition, sealer type, local labor rates, and whether old coatings need removal can move the quote substantially.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Cleaning and sealing | $1 per sq ft | $2 per sq ft | $3 per sq ft | Routine residential concrete |
| 300-sq-ft patio | $300 | $600 | $900 | Professional service |
| Cleaning only | $0.25 per sq ft | $0.50 per sq ft | $1 per sq ft | Pressure washing, typical access |
| Sealing only | $0.50 per sq ft | $1 per sq ft | $2 per sq ft | Surface is clean and ready |
Typical Concrete Cleaning and Sealing Prices by Project Size
For a standard driveway, walkway, or patio in sound condition, combined cleaning and sealing often runs $1-$3 per square foot. A 500-square-foot driveway commonly totals $500-$1,500; decorative or heavily stained surfaces can cost more. Small jobs may fall below the per-square-foot range because contractors often charge a $150-$300 minimum service fee.
A practical budget for a typical 300-square-foot outdoor slab is $300-$900. Prices assume ordinary dirt removal, one application of a standard penetrating or film-forming sealer, and no major repairs. Premium decorative coatings, difficult access, or extensive prep can raise the total.
Assumptions: U.S. residential pricing, standard concrete, normal access, and no extensive coating removal.
What Cleaning, Sealer, and Labor Add to the Quote
Quotes may bundle tasks into one rate, but separating them helps reveal whether a bid includes stain treatment, drying time, and the sealer itself. The ranges below are approximate and can overlap when sold as a package.
| Quote component | Low | Average | High | Typical scope |
|---|---|---|---|---|
| Pressure washing | $0.25 per sq ft | $0.50 per sq ft | $1 per sq ft | Loose soil and surface grime |
| Spot treatment | $25 | $75 | $200 | Oil, rust, or algae treatment |
| Sealer material | $0.15 per sq ft | $0.40 per sq ft | $1 per sq ft | Product and coverage vary |
| Application labor | $0.35 per sq ft | $0.80 per sq ft | $1.50 per sq ft | Prep, masking, and coating |
| Old sealer removal | $1 per sq ft | $2 per sq ft | $4 per sq ft | Grinding or chemical stripping |
Old coating removal is often the largest separate charge, especially when grinding is required. Ask whether the estimate includes moving furniture, masking nearby surfaces, and cleanup, rather than treating these as assumed extras.
How Stains, Slab Size, and Sealer Type Change the Price
Concrete condition matters more than square footage alone. Routine washing is relatively inexpensive; oil, rust, tire marks, algae, and deeply embedded grime may require separate chemicals and repeat treatment. A slab with peeling or incompatible sealer may need stripping before a new product can bond.
Large, open slabs usually get a lower per-square-foot rate than narrow walkways or small landings. Below roughly 200 square feet, minimum charges can dominate. Porous or broom-finished concrete may absorb more product than dense, smooth concrete. Penetrating sealers generally preserve a natural appearance, while decorative film-forming sealers can require more careful prep and application.
Expect a higher quote when the job includes coating removal, multiple stain treatments, or a decorative finish. For areas over 1,000 square feet, ask whether the contractor reduces the unit rate and how many coats are included.
How Long a Concrete Sealing Crew Needs On Site
A two-person crew may wash and seal a straightforward 300- to 600-square-foot slab in about 3-6 working hours, not counting drying or cure time. Larger jobs, difficult stains, or coating removal can add a full day or more. Many sealers need the concrete to dry before application, and the surface may remain off-limits for 12-48 hours afterward, depending on product and weather.
Labor estimates can be checked against local rates, often around $50-$100 per worker-hour before materials, overhead, and travel. Contractors may price by area instead because setup and cleanup take time even on small jobs.
Confirm the required dry time and when foot or vehicle traffic can resume. Rushing application onto damp concrete can lead to poor bonding, cloudy appearance, or early failure.
Three Concrete Cleaning and Sealing Quotes Compared
These examples show how scope changes the total, even when the surface area is similar. They assume ordinary U.S. residential labor rates and exclude sales tax where applicable.
| Job details | Labor and materials | Estimated total | Approx. rate |
|---|---|---|---|
| 250-sq-ft patio, routine wash, penetrating sealer | 3 labor hours; standard prep | $300-$600 | $1.20-$2.40 per sq ft |
| 500-sq-ft driveway, oil spots, one sealer coat | 5-7 labor hours; spot treatment | $700-$1,400 | $1.40-$2.80 per sq ft |
| 800-sq-ft stamped patio, old coating stripped | 10-14 labor hours; premium finish | $2,000-$4,000 | $2.50-$5 per sq ft |
Compare quotes using the same area, sealer type, coat count, and prep scope. A lower bid may omit stain treatment or removal that another contractor has included.
When Removal, Stain Treatment, or Repairs Cost Extra
Oil and rust treatment may add $25-$200 per affected area, while extensive algae removal or repeated chemical treatment can add several hundred dollars. Old sealer removal commonly adds $1-$4 per square foot because it can require chemical stripping, mechanical grinding, or both. Minor crack filling may cost $2-$5 per linear foot; broader patching is usually priced after inspection.
Furniture moving, tight access, nearby landscaping, and water restrictions can also increase labor or setup time. Ask for separate line items for repairs and optional treatments so necessary prep is distinguishable from upgrades.
Do not assume a new coat can cover peeling or incompatible sealer. Skipping required removal may save money initially but can cause uneven adhesion and an early redo.
Ways to Lower the Concrete Sealing Bill Without Cutting Prep
Bundling a driveway, patio, and walkways can reduce mobilization charges, particularly when they are on the same property. Clearing furniture, planters, vehicles, and loose debris before arrival can shorten paid labor, though the contractor should handle pressure washing and surface preparation required for the product.
Choose a sealer suited to the slab rather than paying for a decorative finish that is not needed. Get at least three written quotes, and compare the included cleaning method, stain treatment, number of coats, and return-visit charges. For sound concrete with no existing coating, cleaning only may be reasonable; sealing is a separate choice based on desired protection and appearance.
Control the scope first, then compare the total and per-square-foot price. Avoid selecting a bid solely by its headline rate if it leaves out removal, repairs, or a second coat needed for the specified finish.