Exposed Aggregate vs Plain Concrete: Which Is Better?

These two options share the same base material but differ significantly in how the surface is treated before the concrete sets.

Plain Concrete

Standard concrete is poured, levelled, and finished with a steel trowel or broom. A broom finish drags a stiff brush across the surface while the concrete is still green, leaving shallow ridges that improve grip. A steel-trowel finish is smoother and used mostly indoors. Broom finish is the most common choice for driveways, footpaths, and shed slabs across Australia. It is straightforward work, which is partly why it is cheaper.

Exposed Aggregate

Exposed aggregate starts the same way, but the contractor either seeds decorative stones onto the surface or uses a specially mixed concrete containing the aggregate already blended in. A chemical retarder is sprayed on before the concrete stiffens. Once the concrete has cured sufficiently, the top layer of cement paste is washed and brushed away to reveal the stones beneath. The stones can be local river pebbles, quartz, granite chips, recycled glass, or crushed shells. Perth concreters often use local river aggregate with a warm, sandy tone. In Victoria and NSW, decomposed granite and basalt pebbles are popular. Queensland jobs frequently use lighter-coloured aggregates to reflect heat.

Price is the first thing most homeowners ask about, and the gap between the two finishes is real but not always enormous. General market ranges in 2026 for supplied and laid work run roughly $65-90 per m² for plain broom-finish concrete and $100-150 per m² for exposed aggregate. Keep in mind these are indicative figures only. Your actual quote will vary based on site prep, excavation, reinforcement, access, slope, and the contractor's overheads in your city.

Sealing is an ongoing cost that catches some owners off guard. Exposed aggregate should be sealed after the initial cure and then resealed every few years, particularly in high-UV states like Queensland and WA where the binder degrades faster. A quality penetrating sealer adds $15-30 per m² at the time of installation, plus ongoing maintenance costs.

Both finishes will last decades when properly mixed, reinforced, and cured. The practical differences show up in day-to-day use and long-term appearance.

Durability

Exposed aggregate is harder to crack at the surface level because the stones themselves are dense and resist point loads. However, if a crack does appear, patching it invisibly is nearly impossible. Matching the original aggregate type, size, and colour after years of weathering is a genuine challenge. Plain concrete can be patched more easily, though the repair will still be visible if the original mix is not replicated closely.

In areas with significant frost or freeze-thaw cycles, such as the ACT or parts of the Victorian and NSW highlands, exposed aggregate can be vulnerable to spalling if moisture penetrates unsealed surfaces. Regular sealing matters more in these climates.

Stain and Wear Resistance

Plain concrete in a light grey broom finish shows oil stains, tyre marks, and fertiliser burns quite readily. The flat surface gives stains nowhere to hide. Exposed aggregate's textured, multi-toned surface is far more forgiving. Oil drips, leaf tannins, and general grime are much less obvious. This practical advantage is underrated by people focused only on upfront cost.

Slip Resistance

Broom-finished concrete provides adequate grip for most applications. Exposed aggregate consistently outperforms it, particularly when wet. The uneven surface created by the stones gives feet and tyres significantly more grip. Pool surrounds, steep driveways, and front steps are areas where exposed aggregate earns its extra cost from a safety standpoint alone. Under Australian Standards for outdoor pedestrian surfaces, slip resistance matters and exposed aggregate comfortably meets requirements in most configurations.

Use the application and your budget together to make the call.

Choose Exposed Aggregate When

• The surface is a front driveway, entry path, or pool surround where appearance and safety matter
• Slip resistance is a genuine concern, particularly for families with children or elderly residents
• You want a finish that ages well and hides everyday wear without looking tired after a few years
• You are in a high-UV location like Queensland, WA, or SA and want a surface that weathers gracefully
• You are prepared to budget for resealing every 2-4 years

Choose Plain Concrete When

• The area is a shed slab, utility path, or rear service area where looks are not a priority
• Budget is tight and the money saved will go toward other parts of a build or renovation
• You want the widest possible pool of contractors to quote on the job
• The surface will be largely covered, for example under pavers or a deck, and finish quality is irrelevant

Whichever finish you go with, ask your concreter specifically about control joint placement, edge reinforcement, and minimum concrete thickness for your soil type. These structural basics matter more to long-term performance than surface finish does.