Exposed aggregate concrete gives your patio a unique, textured finish that stands out from plain gray slabs while remaining durable and low-maintenance. Unlike standard concrete, the surface reveals decorative stones, pebbles, or glass embedded in the mix, creating visual appeal that justifies the extra cost. This guide walks you through hiring a contractor, understanding pricing, and knowing what to expect during installation.
What Is Exposed Aggregate Concrete?
Exposed aggregate concrete is created by removing the top layer of cement paste after pouring, revealing the stones or pebbles beneath. The process requires timing, skill, and the right equipment—which is why not all concrete contractors offer it. The stones you choose (river rock, marble chips, granite, recycled glass) determine the final look and cost.
Common aggregate sizes range from ½ inch to 1 inch, though larger decorative stones are available at premium prices. The finish is slip-resistant, making it practical for patios near pools or in rainy climates. Colors depend entirely on your stone selection, so you have significant design flexibility.
Typical Cost Breakdown
Base concrete work: $6–$12 per square foot for standard concrete, before aggregate exposure.
Exposed aggregate premium: Add $3–$8 per square foot for the specialized finishing process and labor-intensive exposure method.
Total range: $9–$20 per square foot, with most homeowners spending $12–$16 for mid-range projects.
A 300-square-foot patio typically runs $3,600–$6,000. High-end decorative aggregates (marble, recycled glass, or imported stones) can push costs to $22–$25 per square foot. Simple river rock finishes land at the lower end of the spectrum.
Prep work, site access, and local labor rates affect final pricing. Urban areas and regions with higher prevailing wages typically cost 20–30% more than rural zones.
How to Find and Hire the Right Contractor
Start with local experience. Ask contractors specifically about exposed aggregate projects they've completed. Request photos of finished patios, ideally from the past 2–3 years. Concrete work degrades visibly if installed incorrectly, so seeing real results matters.
Verify licensing and insurance. Concrete contractors should carry general liability and workers' compensation insurance. Confirm they're licensed in your state or county—requirements vary by location.
Get written quotes from at least three contractors. Include these details in your request:
- Exact square footage and slope requirements
- Aggregate type, color, and size
- Timeline for completion
- Cleanup and site restoration plan
- Warranty coverage (typically 1–2 years for workmanship)
Check references thoroughly. Call past clients and ask specifically about aggregate exposure quality, color consistency, and how the surface has held up. One-star reviews mentioning "uneven exposure" or "poor aggregate distribution" are red flags.
You can compare multiple local contractors side-by-side through Mercoly, which helps you find trusted concrete patio providers and review their portfolios in one place.
Installation Timeline and Practical Considerations
Most exposed aggregate patios take 7–10 days from start to finish, though curing adds time before you can use the surface. The concrete must cure for 3–5 days before the contractor exposes the aggregate, and full strength takes 28 days.
Weather matters. Rainy conditions extend the timeline and complicate the exposure process, so schedule work during dry seasons if possible. Spring and fall typically offer the best conditions in most climates.
Drainage is critical. A proper slope (typically ¼ inch per foot) prevents water pooling. Ask contractors how they'll ensure adequate drainage, especially if your patio is near the house or a deck.
What to Ask Before Hiring
- What's your process for controlling aggregate depth and consistency across the entire surface?
- How do you handle the sealing process, and is it included in your quote?
- What happens if the aggregate color or appearance doesn't meet expectations after exposure?
- Do you offer a warranty, and what does it cover?
Frequently Asked Questions
Q: Will exposed aggregate concrete get slippery when wet? No—the textured surface actually provides better traction than polished concrete, making it safer around pools or on slopes.
Q: How long does exposed aggregate concrete last? Properly installed and sealed exposed aggregate typically lasts 25–30 years in residential settings, similar to standard concrete, though freeze-thaw cycles and deicing salt can reduce lifespan in harsh climates.
Q: Can I repair or patch exposed aggregate concrete if it cracks? Patches are visible because matching aggregate color and exposure depth is difficult; prevention through proper installation and sealing is better than repair.
Start by collecting 3–4 contractor quotes this week, and ask each about their specific experience with aggregate color matching and exposure techniques.