ExposedaggregatedrivewaysinAdelaide,finishedbyBWC-licensedconcreters
A 60m2 exposed aggregate Adelaide driveway runs $9,500 to $15,500. Sample panels are standard on any job over $5,000. We connect you with licensed concreters who hold the exposure window to the minute.
Why exposed aggregate is the most quote-spread finish in Adelaide
Exposed aggregate is the most technically variable finish on the Adelaide market. You see an inspiration photo of charcoal aggregate, sign with a concreter, and three months later your driveway is streaky brown.
The stone source, the sky conditions on pour day, and the timing of the surface wash all change the final look. Without a sample panel and a written stone specification, you have no defence if the result does not match the inspiration photo.
The cheap quote on exposed aggregate saves money by skipping the sample panel, using a different stone source than specified, or rushing the exposure wash. All 3 shortcuts produce the same result: a finish that does not match what you were shown.
How the exposure process actually works
Exposed aggregate is poured as standard concrete with the decorative aggregate either mixed through or broadcast on the surface before it sets. The critical step is the broom wash: a timed surface wash that removes the cement paste to reveal the aggregate below.
The window for that wash is narrow - typically 2 to 6 hours after pour, depending on temperature, humidity, and the mix used. A chemical retarder is applied to the surface before pour to hold the cement paste open longer and give the concreter more control over timing.
Network concreters working in exposed aggregate document the exposure timing on the pour-day notes and use a retarder to manage the window. Stone choice (charcoal granite, quartz, river pebble) is locked in writing before the pour.
Sealing exposed aggregate in Adelaide conditions
SA UV exposure is harder on surface sealers than most Australian states. Penetrating sealers protect from within the slab and do not yellow, peel, or require stripping when they expire. Re-seal every 3 to 5 years.
Film-forming sealers give a wet-look finish that many customers prefer initially, but they require more frequent re-application and can trap moisture under the film in cooler months, leading to debonding of aggregate stones. Penetrating sealers are the default recommendation for exposed aggregate in Adelaide.
The sealer goes on at 28 days, after full cure. Early sealing traps bleed water and prevents the slab from reaching design strength. Every quote from the network includes the sealer at 28 days as a line item, not an optional add-on.
Related services and cost information
Exposed aggregate cost Adelaide - full price breakdown by stone type, size, and sealing.
Decorative concrete - stamped, coloured, and pattern finishes compared.
Decorative concrete comparison - exposed aggregate vs stamped vs polished external.
BWC licensing in SA - when the $20,000 threshold applies to your project.
Area coverage: Holdfast Bay, Burnside, Campbelltown, and across metro Adelaide.