If you’re in coastal North Carolina, you’ll usually pay about $1–$3 per square foot installed to clean and reseal exposed-aggregate concrete. That range assumes real cleaning, proper prep, and applying a compatible sealer.
Your exact number depends less on “coastal pricing” and more on what your slab demands: how much algae and embedded grime has to come out and how thirsty the aggregate is (which drives sealer usage and coat count). Below, you’ll see what that per-square-foot price typically includes in the Wilmington area. It’s sandbags-before-the-storm detail, and it helps you do it right the first time.
Coastal NC Price Range Per Sq Ft (How much does it cost to clean and reseal exposed-aggregate concrete per square foot in coastal NC?)
National cost guides routinely put professional exposed aggregate concrete cleaning cost per square foot in the $1–$3 per sq ft band, which is why ultra-low bids often look great on paper and fail in the real world once prep and product volume show up.
In the Wilmington–Carolina Beach–Wrightsville Beach market, most installed quotes for exposed aggregate concrete reseal cost per square foot still fall in the $1–$3 per sq ft range, and typical jobs land closer to mid-range pricing. If someone quotes far below $1/sq ft, that’s not a deal. It’s usually “sealer only” (or a very light wash), and even the Nextdoor crowd should side-eye it.
For pricing purposes, “clean + reseal” typically means you’re paying for: surface cleaning (pressure wash and removal of algae/grime) and applying a concrete sealer (often one system coat plan, sometimes built as two thin coats for better, more even coverage on textured aggregate) as part of concrete sealing Wilmington NC. Exposed aggregate can soak up much more product than smooth concrete, so it’s not a quick, cheap spray-and-go item even when the slab looks “basically fine” from the driveway.
Sealer choice and the way it’s applied are major reasons exposed aggregate can look blotchy or wear unevenly after a “quick reseal.” Read more in our article: Acrylic Concrete Sealer
What Drives Your Exact $/Sq-Ft Number
Your price swings mostly come from how much labor and product the surface demands. Think sunscreen on a salt-air day, not a mysterious “coastal upcharge,” and that’s in the ballpark. A slab that looks similar from the street can price very differently once you account for condition, how thirsty the exposed aggregate is, and how much masking and protection the crew has to do around siding, garage doors, landscaping, or a pool edge.
In coastal NC, the biggest movers tend to be: how much algae/mildew and embedded grime has to come out before sealing, whether you’ve got salt-related residue or staining that needs extra dwell time and rinsing, and whether the existing sealer is failing in patches (which can force heavier prep). Case in point: exposed aggregate often takes far more sealer than smooth concrete (many manufacturer coverage specs for exposed-aggregate sealers drop dramatically on the first coat due to texture/porosity). See example coverage guidance on an exposed-aggregate sealer product listing. It’s like watering sandy soil, so two thin coats and lower per-gallon coverage can legitimately push a bid up even when the square footage stays the same. If you’re comparing quotes, stop treating “reseal” like a single, standard step, and look for whether the contractor is pricing real prep, real coverage, and a realistic minimum charge for a smaller area.
Coastal algae and mildew can bond tightly in textured finishes, so removing growth thoroughly before sealing often determines whether the new coat adheres and looks even. Read more in our article: Exposed Aggregate Concrete Mold
How to Compare Quotes and Avoid Bad Reseals
A homeowner picks the cheapest reseal, and two weeks later the driveway has a patchy sheen and footprints that never quite stop feeling tacky. The difference usually isn’t luck; it’s what the quote left out.
A “reseal” can fail fast if the quote is vague, because exposed aggregate punishes shortcuts: uneven sheen and tracked-in tackiness usually trace back to surface prep for concrete sealing. Don’t compare only the $/sq ft; compare what you’re paying for at that number.
| Quote item to confirm | What it should specify | Why it matters |
|---|---|---|
| Coat plan & coverage assumption | “Two thin coats” vs “one coat,” plus a coverage-rate assumption that accounts for thirsty exposed aggregate | Helps you compare apples-to-apples on product volume and finish uniformity |
| Sealer type & finish | Water-based vs solvent-based acrylic, and target sheen (not just “clear sealer”) | Chemistry and sheen affect durability, appearance, and recoat behavior |
| Compatibility step if old sealer is unknown | A test spot and what happens if it fails (strip cost, product change, or stop-work option) | Reduces risk of whitening, peeling, or adhesion failure from incompatibility |
| Cure & access window | When you can walk/park on it, and how rain or coastal humidity affects schedule | Prevents premature use and sets realistic timing expectations |
If a proposal won’t specify these basics, treat that as a quality signal. This Old House would call it a hard pass, and so should you.
A detailed, line-item comparison can make it obvious when a low quote is skipping prep, protection, or realistic material coverage. Read more in our article: Compare Paving Bids
Roof not getting any younger? Contact us or call 703-673-6301 to find out where you stand.
