Exposed Aggregate vs Plain Concrete on the Central Coast

What the Two Finishes Actually Are

Plain concrete is exactly what it sounds like. The slab is poured, screeded and trowelled or broomed to a plain grey surface. It is the finish most people picture, it is the cheapest to lay, and there is nothing wrong with it on the right block. A broomed plain surface even has a bit of texture for grip, which is why so many paths and sheltered driveways are done this way.

Exposed aggregate starts as the same slab, but before it fully hardens the top layer of cement paste is washed back to reveal the stone in the mix underneath. You choose the stone, so the look ranges from soft river pebble to a sharper crushed granite. That washed-back surface is what gives exposed aggregate its two big advantages on the Coast: it grips underfoot and it hides marks. The trade-off is more work on the day and a higher rate, because the wash-back and the stone selection are a skilled step on top of the pour.

Grip, Slope and the Coast

This is where the choice really matters here, and it is the local hook. A lot of Central Coast blocks are not flat. Driveways at Terrigal, Avoca, Wamberal, Kincumber and Hardys Bay run up or down a slope, and the Coast gets its share of wet weather and sea mist. A smooth, hard-trowelled plain slab on a steep drive is slippery when it is wet, and that is a genuine safety issue when you are reversing a car or walking down to the bins in the rain.

Exposed aggregate's non-slip grip is why it has become the default for wet coastal driveways, pool surrounds and sloped beachside blocks. Around Coast pools it is everywhere, because it copes with wet feet without turning into a skating rink. Salt tolerance is the other coastal angle: homes near the water at Ettalong, Terrigal and Hardys Bay sit in salt-laden air, and while the surface finish is not the main defence against salt, exposed aggregate's texture hides the staining that would show on smooth grey, and it pairs naturally with the coastal mix and sealing those blocks want anyway. On a flat, sheltered block back from the water, none of that pressure applies and plain grey is a perfectly sensible, cheaper answer.

Cost and How to Decide

As an indicative guide, plain grey runs about $80 to $120 per square metre supplied and laid, and exposed aggregate sits higher at roughly $120 to $170. Those are market ranges to help you read a quote, not a price from us, and the full breakdown is in our Central Coast driveway cost guide. The base and the steel under both finishes are identical, so the extra you pay for exposed aggregate is the finish alone, spent once on a surface you keep for decades. If your existing slab is sound and you only dislike the look, resurfacing can give you a decorative finish without a full replacement, so it is worth pricing too. The simple rule: if the driveway is steep, near the water or gets wet often, lean exposed aggregate; if it is flat, sheltered and budget is tight, plain grey is fine.

Get a Fixed-Price Quote

Not sure which finish suits your block? Tell us the suburb, the slope and how much sun and salt it gets, and a local concreter will talk you through it on site. You can also send the details via our contact page for a call back.

📞 Call 0482 392 415