Homeowners asking about aggregate concrete in Severn, MD are usually weighing one thing: does the upgraded curb appeal justify the extra cost over plain gray concrete? Exposed aggregate has become a go-to finish for driveways, patios, and walkways across Anne Arundel County because it holds up to Maryland's freeze-thaw winters while looking far more finished than a standard slab. Here is what it is, what it costs in 2026, and how a local installation actually comes together.
What Is Exposed Aggregate Concrete?
Exposed aggregate concrete is a decorative finish where the top layer of cement paste is removed to reveal the stones, pebbles, or shells mixed into the slab below. The result is a textured, speckled surface that is both slip-resistant and visually distinct from standard broom-finished concrete. The National Ready Mixed Concrete Association lists exposed aggregate alongside dry-shake color and stamped patterns as one of the standard decorative treatments available on concrete flatwork.
How Contractors Expose the Aggregate
There are two common methods, and the choice affects both cost and texture control.
- Surface retarder method: A retarding agent is applied to the surface while the mix is still plastic. Once the base concrete has set, crews wash and lightly brush the top layer away to expose the stone underneath.
- Seeding method: Standard concrete is poured, then clean decorative aggregate is broadcast onto the wet surface and floated in before the paste is washed back.
The Portland Cement Association's finishing guide notes that seeded aggregate must be carefully selected and washed before placement so the stones bond properly with the base mix.
| Method | Typical Cost | Texture Control | Best Use Case |
|---|---|---|---|
| Seeding | Slightly lower | Moderate, depends on broadcast evenness | Smaller patios, walkways |
| Surface retarder | Slightly higher | Precise, consistent exposure depth | Driveways, larger slabs |
Why Severn's Own Aggregate Supply Chain Works in Your Favor
Here's something most guides on this topic skip entirely: Severn isn't just a place where homeowners buy decorative concrete, it's also a hub for the raw materials that go into it. Holcim operates a sand, gravel, and ready-mixed concrete facility on Cunningham Road in Severn, and Vulcan Materials and Chaney Enterprises both run plants within a short drive in Odenton and Gambrills. That concentration of producers means local contractors generally have shorter lead times on ready-mix and decorative aggregate deliveries than homeowners in areas without a regional plant nearby, which matters when timing the pour around Maryland's unpredictable spring and fall weather windows.
Benefits of Exposed Aggregate Concrete
Exposed aggregate holds up to harsh weather conditions about as well as standard concrete, and better than many natural stone alternatives. It requires little upkeep beyond an annual cleaning and periodic resealing. A few other advantages worth noting:
- Naturally slip-resistant texture, useful on sloped driveways or pool patios
- Wide range of decorative aggregate colors and sizes
- Hides minor surface imperfections better than smooth or stamped finishes
- Competitive pricing compared to stamped concrete or natural stone pavers
Drawbacks to Consider
The main trade-off is upfront cost. Exposed aggregate runs higher per square foot than standard poured concrete, and it needs periodic resealing. Unsealed exposed aggregate is more susceptible to water intrusion, staining, chipping, and abrasion over time. Sealers themselves are also regulated: the EPA's national VOC emission standards for architectural coatings set content limits that apply to concrete sealing products, so a reputable installer should be using a compliant, low-VOC sealer rather than whatever is cheapest.
Aggregate Concrete Cost in Severn, MD (2026)
Concrete and hardscaping projects in Severn are typically priced by square footage, aggregate selection, and site prep needs. Exposed aggregate generally runs $8 to $12 per square foot, about $2 to $3 more than standard broom-finished concrete. Basic single-aggregate finishes land at the lower end, mid-tier mixes with decorative stone sit in the middle, and premium multi-color or large-aggregate designs push toward $12 or beyond.
| Project Size | Estimated Cost Range |
|---|---|
| 200 sq ft walkway | $1,600 to $2,400 |
| 400 sq ft patio | $3,200 to $4,800 |
| 600 sq ft driveway | $4,800 to $7,200 |
Site prep (grading, excessive slope correction, or old concrete removal) is billed separately and can add to the total. Request a free estimate for pricing specific to your lot and aggregate choice.
How We Handle Aggregate Concrete Projects in Severn, MD
Most projects move through five stages:
- Consultation and layout - confirming square footage, drainage, and aggregate selection.
- Site preparation and grading - removing old material and compacting a stable base.
- Forming and pouring - setting forms, placing the concrete mix, and either seeding or applying retarder.
- Exposure and curing - washing back the surface paste, then allowing the slab to cure.
- Sealing - applying a protective sealer once curing is complete.
Most Severn patios and walkways finish in a few days to about two weeks, depending on size and weather. Proper site prep is the step that gets skipped most often by inexperienced crews, and it's also the step most responsible for long-term cracking, which is why our site preparation and grading and compaction teams handle it before any concrete gets poured.
Areas Near Severn We Serve
We serve Severn and the surrounding Anne Arundel County and Baltimore County communities, including Glen Burnie, Pasadena, and Baltimore. See our full Anne Arundel County coverage for nearby neighborhoods.
Why Severn Homeowners Choose SEJ Paving
Local experience matters with Maryland's freeze-thaw climate. Our crews have poured and sealed exposed aggregate patios and driveways throughout Severn and the surrounding county, and the base prep step is where we spend the most time, because that's the difference between a slab that lasts decades and one that heaves within a few winters. Homeowners consistently choose a licensed, insured concrete contractor who understands regional soil and drainage conditions rather than a crew passing through for one job. Browse our full concrete contractor services or see completed work on our projects page. For decorative finishing specifically, our concrete finishing team handles exposed aggregate, stamped, and colored options.
Thinking about equipment or prep tools for a DIY section of the job? Our guide on cordless concrete vibrators in Severn, MD covers that separately, but for the pour itself, most homeowners are better off scheduling a patio installation or driveway installation with a licensed crew.
FAQ
Why Does Concrete Crack and Heave in Severn, MD?
Maryland's freeze-thaw cycles and inadequate base compaction are the main culprits behind cracked, heaved concrete in older Severn homes. The NRMCA's guidance on concrete scaling and freeze-thaw damage points to air-entrained concrete and proper curing as the primary defenses. Proper gravel base compaction before pouring helps prevent both issues.
What Aggregate Concrete Services Do We Offer in Severn, MD?
We install poured concrete patios, walkways, and steps, plus decorative options including stamped, colored, and exposed-aggregate finishes. Browse our concrete finishing page for full details.
Does Exposed Aggregate Concrete Need to Be Sealed?
Yes. Sealing protects the exposed stone and surrounding paste from moisture and staining. Most surfaces need resealing roughly every two to three years, sooner in high-traffic or pool-adjacent areas.
How Long Does Exposed Aggregate Concrete Last?
Most industry estimates put a well-installed, regularly resealed exposed aggregate slab at 20 to 30+ years, though the exact lifespan depends on climate exposure, traffic load, and how consistently it gets resealed.
Can You Install Exposed Aggregate Over Existing Concrete?
Sometimes, using a thin aggregate overlay, but it depends on the condition of the existing slab. If the base concrete has significant cracking or heaving, an overlay will usually telegraph those problems to the surface. Our guide on pouring concrete over concrete in Anne Arundel County covers when an overlay works and when a full replacement is the better call.
Is Exposed Aggregate Cheaper Than Stamped Concrete?
Generally, yes. Exposed aggregate typically runs $8 to $12 per square foot, while stamped concrete often starts around the same price and climbs higher for intricate patterns and multiple colors. Exposed aggregate also tends to need less color touch-up over time since the stone itself provides the visual interest rather than a dye or stain layer.
Ready to compare options for your own driveway or patio? Visit our homepage to see our full range of concrete and paving services, or contact us for a free, no-obligation estimate on your Severn property.
